NL2013769B1 - Method for inspecting and/or repairing surface damage of a component in an interior of a device, using fluorescent penetrant inspection (FPI), as well as borescope system and borescope inspection kit. - Google Patents

Method for inspecting and/or repairing surface damage of a component in an interior of a device, using fluorescent penetrant inspection (FPI), as well as borescope system and borescope inspection kit. Download PDF

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Publication number
NL2013769B1
NL2013769B1 NL2013769A NL2013769A NL2013769B1 NL 2013769 B1 NL2013769 B1 NL 2013769B1 NL 2013769 A NL2013769 A NL 2013769A NL 2013769 A NL2013769 A NL 2013769A NL 2013769 B1 NL2013769 B1 NL 2013769B1
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Netherlands
Prior art keywords
distal end
insertion tube
damage
rotatable head
fluid
Prior art date
Application number
NL2013769A
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Dutch (nl)
Inventor
Van Waveren Hogervorst Jeroen
Willemstijn Robin
Original Assignee
Koninklijke Luchtvaart Mij N V
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Application filed by Koninklijke Luchtvaart Mij N V filed Critical Koninklijke Luchtvaart Mij N V
Priority to NL2013769A priority Critical patent/NL2013769B1/en
Priority to PCT/NL2015/050741 priority patent/WO2016076704A1/en
Application granted granted Critical
Publication of NL2013769B1 publication Critical patent/NL2013769B1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2476—Non-optical details, e.g. housings, mountings, supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
    • B64F5/60—Testing or inspecting aircraft components or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
    • F01D25/285—Temporary support structures, e.g. for testing, assembling, installing, repairing; Assembly methods using such structures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/91—Investigating the presence of flaws or contamination using penetration of dyes, e.g. fluorescent ink
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/9515—Objects of complex shape, e.g. examined with use of a surface follower device
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/72—Maintenance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/80—Repairing, retrofitting or upgrading methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/80—Diagnostics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/83—Testing, e.g. methods, components or tools therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
    • G01N2021/9542—Inspecting the inner surface of hollow bodies, e.g. bores using a probe

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

The invention relates to a method for inspecting and/or repairing surface damage of a component in a device via an access opening, using fluorescent penetrant inspection (FPI), with a borescope inspection kit comprising flexible conduits, a display screen and a borescope system comprising a borescope with an insertion tube having a distal end and a proximal end, the distal end of the borescope comprising a camera and a lighting arrangement comprising a UV light source, the camera and the lighting arrangement being arranged for viewing and providing light in a viewing or lighting direction perpendicular to a longitudinal axis of the insertion tube, wherein the distal end is provided with a rotatable head, wherein a flexible conduit comprising a distal tip and a proximal tip is insertable into the insertion tube for slideable reception of the distal tip by the rotatable head.

Description

Method for inspecting and/or repairing surface damage of a component in an interior of a device, using fluorescent penetrant inspection (FPI). as well as borescope system and borescope inspection kit
Field of the invention [0001] The present invention relates to a method for inspecting and/or repairing surface damage of a component in an interior of a device, using fluorescent penetrant inspection (FPI), as well as a borescope system and a borescope inspection kit for use with such a method.
Background of the invention [0002] Fluorescent Penetrant Inspection (FPI) procedures for inspecting devices such as gas turbines are known from for instance US2014/0063228, which describes a very general way of performing a non-destructive inspection, such as an FPI. US2014/0063228 for instance discloses a method comprising the insertion of a borescope into a borescope opening, the borescope having an insertion portion and a feed tube, steering the insertion and feed tube around obstacles inside the device, cleaning a surface using a cleaning fluid supplied via the feed tube, and then performing the non-destructive inspection of the surface with the insertion tube.
[0003] A disadvantage of the procedure as disclosed in US2014/0063228 is that the method disclosed therein is too generic and in practice can not be used for FPI-inspection of very tight spaces, such as the high pressure compressor (HPC) or the high pressure turbine (HPT) stages of a jet engine. For instance, US2014/0063228 does not disclose how to actually carry out the individual steps of such an FPI-procedure to establish whether a certain amount of surface damage, in particular of a compressor blade of the HPC or a turbine blade of the HPT, needs to be repaired, for instance by opening the jet engine, or merely needs to be monitored until inspection at a later stage, for instance after a predetermined amount of engine operation cycles.
[0004] In this respect, it should be noted that in case of a jet engine, when the respective surface damage has been repaired by using blending, standard practice prescribes that the jet engine must be re-inspected after 25-50 operating cycles. This is due to the fact that present FPI-procedures do not allow for a practical way of evaluating the damage and, based on that evaluation, to predict how the surface damage will further develop. Such a re-inspection is very costly to the operator of the aircraft, because the re-inspection itself is costly and the aircraft will not be able to fly during the re-inspection. Another important issue is that every time the jet engine’s casing is removed, the engine loses a small amount of engine thrust.
[0005] It is therefore an object of the present invention to provide a method for inspecting and/or repairing surface damage of a component in an interior of a device, using fluorescent penetrant inspection (FPI), as well as a borescope system and a borescope inspection kit, wherein even in a tight space the extent of surface damage can be accurately determined, such that unnecessarily opening the device, especially a jet engine, can be avoided.
[0006] It is a further object of the invention to provide a method for inspecting and/or repairing surface damage of a component in an interior of a device, using fluorescent penetrant inspection (FPI), as well as a borescope system and a borescope inspection kit, wherein it can be sufficiently determined whether the device, in particular a jet engine, needs to be re-inspected after a certain period of time.
Summary of the invention [0007] Hereto, according to the invention, a method is provided for inspecting and/or repairing surface damage of a component in an interior of a device comprising a housing with a borescope access opening to the interior of the device, using fluorescent penetrant inspection (FPI), with a borescope inspection kit to be described hereafter, comprising the steps of: a) rotating the rotatable head to the inactive position and inserting the penetrant application conduit into the insertion tube, such that the distal tip is slideably received in the rotatable head, the distal tip being provided with a fluid applicator comprising a fluid absorbent material, b) inserting the insertion tube into the access opening, moving the distal end towards the damage, rotating the rotatable head to the active position and slideably adjusting the position of the distal tip, such that both the distal tip and the damage are visible on the display screen, c) wetting the fluid applicator via the distal tip with penetrant supplied at the proximal tip of the penetrant application conduit, and applying the penetrant to the damage by moving the wetted fluid applicator over the damage, d) rotating the rotatable head to the inactive position, retracting the insertion tube from the access opening and allowing the penetrant to dwell, e) removing the penetrant application conduit from the insertion tube, f) inserting a developer application conduit into the insertion tube, such that the distal tip is slideably received in the rotatable head, g) inserting the insertion tube into the access opening and moving the distal end towards the damage, rotating the rotatable head to the active position and slideably adjusting the position of the distal tip, such that both the distal tip and the damage are visible on the display screen, h) distributing a developer onto the damage via the distal tip by supplying a developer substance at the proximal tip of the developer application conduit, i) rotating the rotatable head to the inactive position, retracting the insertion tube from the access opening and allowing the developer to develop, j) inserting the insertion tube of the borescope into the access opening, moving the distal end towards the damage, such that the damage is visible on the display screen, and k) inspecting the damage by using the UV light source.
[0008] The above-described method and borescope system, to be described hereafter, in practice appear to be very suitable for carrying out FPI-inspections in very tight spaces, in particular in the HPC or HPT stages of a jet engine. The combination of the rotatable head and the rigid insertion tube allows the operator of the borescope system to reach far into the interior of the device. By arranging the camera and the lighting arrangement for, respectively, viewing and providing light in a viewing, respectively, lighting, direction perpendicular to a longitudinal axis of the rigid insertion tube, the operator can get very close to the damage, while the rotatable head is allowed to rotate to a very large angle with respect to the insertion tube. By not having the camera and lighting arrangement installed on or in the rotatable head, the use of cabling susceptible to failure upon bending, such as optical fibers, can be avoided. Additionally, this arrangement allows for a highly useful perspective view inside a tight space, due to the spatial separation of the camera and lighting system from the rotatable head and the distal tip of the flexible conduit. Furthermore, the fluid applicator with the fluid absorbent material allows fluids to be applied to the damage in a very controlled way, without spilling the fluid inside the device. Rotating the rotatable head to its active position only when near the damage allows the insertion tube to have hardly any or only a minimal amount of radial protrusions when maneuvering towards the damage.
[0009] The respective fluids can be supplied at the proximal tip via, for instance, a syringe or the like. The skilled person will also understand that, apart from the rotatable head, the flexible conduit is also slideably received in the insertion tube. Otherwise, pushing and pulling of the flexible conduit at the proximal tip thereof would not be possible for controlling the distal tip. The skilled person will also understand that the borescope is provided with the necessary controls to manipulate the rotational position of the rotatable head.
[0010] Another embodiment relates to an aforementioned method wherein prior to step a), after step d) or after step k), the following steps are carried out: l) rotating the rotatable head to the inactive position and inserting the cleaner application conduit into the insertion tube, such that the distal tip is slideably received in the rotatable head, the distal tip being provided with a fluid applicator comprising a fluid absorbent material, m) inserting the insertion tube into the access opening, moving the distal end towards the damage, rotating the rotatable head to the active position and slideably adjusting the position of the distal tip, such that both the distal tip and the damage are visible on the display screen, n) wetting the fluid applicator via the distal tip with cleaner supplied at the proximal tip of the cleaner application conduit, and applying the cleaner to the damage by moving the wetted fluid applicator over the damage, o) rotating the rotatable head to the inactive position, retracting the insertion tube from the access opening and allowing the penetrant to dwell, and p) removing the cleaner application conduit from the insertion tube.
Thus, the damage can be advantageously cleaned if desired, even in a tight space. This is of particular importance when an additional etching step has to be performed before the FPI-procedure or when excess penetrant has to be removed.
[0011] Another embodiment concerns an aforementioned method wherein, when the method involving the above cleaning procedure is carried out, after step d), the following steps are carried out: q) inspecting the damage by using the UV light source for backglow and, in case of backglow, repeating step n) as many times as necessary.
This advantageously allows the operator to verify if more penetrant needs to be removed.
[0012] Another embodiment concerns an aforementioned method wherein, when using a borescope inspection kit to be described hereafter, prior to step 1), when the above cleaning procedure is carried, or prior to step a), the following steps are carried out: r) rotating the rotatable head to the inactive position and inserting the etching fluid application conduit into the insertion tube, such that the distal tip is slideably received in the rotatable head, the distal tip being provided with a fluid applicator comprising a fluid absorbent material, s) inserting the insertion tube into the access opening, moving the distal end towards the damage, rotating the rotatable head to the active position and slideably adjusting the position of the distal tip, such that both the distal tip and the damage are visible on the display screen, t) wetting the fluid applicator via the distal tip with etching fluid supplied at the proximal tip of the etching fluid application conduit, and applying the etching fluid to the damage by moving the wetted fluid applicator over the damage, u) supplying a flushing fluid at the proximal tip as to flush the etching fluid application conduit, the fluid applicator and the surface until the etching fluid is diluted to neutral pH and subsequently removing the flushing fluid from the fluid applicator and the etching fluid application conduit by applying suction to the proximal tip, v) rotating the rotatable head to the inactive position, retracting the insertion tube from the access opening, and removing the etching fluid application conduit from the insertion tube, w) inserting the gas drying conduit into the insertion tube, such that the distal tip is slideably received in the rotatable head, x) inserting the insertion tube into the access opening, moving the distal end towards the damage, rotating the rotatable head to the active position and slideably adjusting the position of the distal tip, such that both the distal tip and the damage are visible on the display screen, y) applying a pressurized gas to the proximal tip to blow the surface dry via the distal tip, z) rotating the rotatable head to the inactive position, retracting the insertion tube from the access opening, and aa) removing the gas drying conduit from the insertion tube.
In this way, an etching procedure can be performed inside the tight space, without spilling etching fluid. Especially in the case of jet engines, spilling etching fluid is detrimental to the interior components of the engine.
[0013] Another embodiment concerns an aforementioned method wherein, when using a borescope inspection kit to be described hereafter, prior to carrying out the method involving the etching procedure the following steps are carried out: bb) rotating the rotatable head to the inactive position, cc) inserting the insertion tube into the access opening, moving the distal end towards the damage, such that the damage is visible on the display screen, dd) determining the dimensions of the damage using the display screen, to establish if the dimensions of the damage are within blendable limits, ee) if the dimensions of the damage are found to be within blendable limits: rotating the rotatable head to the inactive position, retracting the insertion tube from the access opening and blending the damage using a blending scope inserted through the borescope access opening, and, after blending, removing the blending scope from the borescope access opening.
The above-described FPI-procedure is particularly useful, as explained before, after the blending procedure as described above.
[0014] Another embodiment concerns an aforementioned method, wherein the device is a gas turbine engine, in particular a jet engine.
[0015] Another embodiment concerns an aforementioned method, wherein the component is a blade of a rotor or a stator of the gas turbine engine, the blade, in case of a rotor, having a convex side, a concave side, a leading edge and a trailing edge. The above method and borescope inspection kit advantageously allow damage to the leading edge or trailing edge to be readily assessed with the FPI-procedure.
[0016] Another embodiment concerns an aforementioned method, wherein the interior of the device is a high pressure turbine (HPT) stage or a high pressure compressor (HPC) stage of the gas turbine engine and the blade is situated in the HPT or the HPC stage.
[0017] Another embodiment concerns an aforementioned method, wherein an outer diameter of the insertion tube, measured in radial direction, is 0,3 - 3 cm, such as 0,8 -1,5 cm. Most tight spaces can be reached with an insertion tube having the above dimensions, while allowing flexible conduits having the necessary outer dimensions to be inserted in the hollow conduit space of the insertion tube.
[0018] Another embodiment concerns an aforementioned method, wherein a working distance, when the insertion tube is inserted through the access opening and moved towards the damage, in a direction perpendicular to the longitudinal axis of the insertion tube, between the distal end and the surface damage is 0,1 - 20 cm, such as 1 -10 cm, in particular 1-5 cm. Such a working distance, facilitated by the borescope system used, provides the operator with a proper perspective view of, in particular, the distal tip, while allowing him to work relatively close to the surface damage.
[0019] Another embodiment concerns an aforementioned method, wherein, when the insertion tube is inserted through the access opening and moved towards the damage, the insertion tube extends parallel to a surface comprising the surface damage. Thus, the surface damage can be optimally viewed with the camera, and lighted with the lighting arrangement.
[0020] Another embodiment concerns an aforementioned method, wherein the method is carried out on both the convex and the concave side of the blade. Thus, it can be assured that a crack or other type of surface damage does not extend through the blade from one side to the other. To do so, the insertion tube can be rotated over 180° (with the longitudinal axis as rotational axis) and/or inserted into an adjacent borescope access opening.
[0021] Another embodiment concerns an aforementioned method, wherein the surface damage is situated on the leading edge or the trailing edge of the blade. The method and borescope system according to the invention allow such damage to be inspected effectively. The damage can be advantageously viewed in a direction perpendicular to the blade, whereas the blade itself can be approached sideways, relative to the viewing direction (and as shown on the display screen), by the distal tip, in particular the fluid applicator, to apply fluid to the respective leading or trailing edge, or perform other steps of the FPI-inspection.
[0022] Another embodiment concerns an aforementioned method, wherein the amount of flushing fluid is at least 200 ml. The inventors have found this amount of fluid to be optimal for flushing away any remaining etching fluid.
[0023] Another embodiment concerns an aforementioned method, wherein the dwell time of the penetrant is 30 - 120 minutes. The inventors have found that the aforementioned dwell time yields good results in practice.
[0024] Another embodiment concerns an aforementioned method, wherein the UV light source is a UV LED. Such a UV LED provides good illumination and has a relatively large penetration depth, i.e. it does not easily lose illuminative strength at larger distances from the UV light source.
[0025] Another embodiment concerns an aforementioned method, wherein the developer is a dry powder developer. Such a dry powder has proven to be particularly useful at short distances to the damage.
[0026] Another embodiment concerns an aforementioned method, wherein the dry powder developer is applied at a working distance between the distal tip and the damage of 2-8 mm, in particular 3-4 mm.
[0027] Another embodiment concerns an aforementioned method, wherein the dry powder is applied via a plurality of holes, in particular 3-6, such as 5, holes, arranged at the distal tip of the developer application conduit.
[0028] Another embodiment concerns an aforementioned method, wherein the dry powder developer is transported from the proximal tip to the distal tip by means of a venturi pump, in particular a hand-operated venturi pump. Such a venturi pump in practice appears to be very suitable for applying controlled quantities of dry powder, in particular at short distances.
[0029] Another embodiment concerns an aforementioned method, wherein the powder development time is 10 - 240 minutes. The inventors have found that most cracks will be visible afterwards by using this development time.
[0030] Another aspect of the invention relates to a borescope system for use with the aforementioned method, comprising a borescope with an elongated, rigid insertion tube having a distal end and a proximal end, the distal end of the borescope comprising a camera, during use connected to a display screen, and a lighting arrangement comprising a conventional light source and a UV light source, wherein the camera and the lighting arrangement are arranged for, respectively, viewing and providing light in a viewing, respectively, lighting, direction perpendicular to a longitudinal axis of the rigid insertion tube, wherein the distal end is provided with a rotatable head, such as hingedly connected to the distal end, rotatable between an inactive position and an active position, around a rotational axis perpendicular to the longitudinal axis of the rigid insertion tube, wherein a flexible conduit comprising a distal tip and a proximal tip is insertable into the proximal end of the insertion tube for slideable reception of the distal tip by the rotatable head at the distal end, wherein in the active position the rotatable head is rotated away from the longitudinal axis such that the distal tip extends at an angle to the longitudinal axis and in the inactive position the rotatable head along with the distal tip is rotated towards the longitudinal axis with respect to the active position.
[0031] Another embodiment relates to an aforementioned borescope system, wherein the elongated, rigid insertion tube has a length of 200-800 mm, such as 300-400 mm, in particular around 360 mm. This length allows the operator to reach most parts of common devices, in particular jet engines, while allowing him to be able to manually balance the borescope system around the hinge point as formed by the edges of the borescope access opening.
[0032] Another embodiment relates to an aforementioned borescope system, wherein the rotatable head can be rotated with respect to the longitudinal axis of the insertion tube at an angle of 0-110°. The inactive position can then for instance relate to the angle of 0°, while in the active position the angle can be 80-110°, such as 90°. In any case, virtually all tight places are eligible to inspection by using such angles, even the opposite side of a turbine or compressor blade.
[0033] Another embodiment relates to an aforementioned borescope system, wherein an outer diameter of the insertion tube, measured in radial direction, is 0,3 - 3 cm, such as 0,8 - 1,5 cm.
[0034] Another embodiment relates to an aforementioned borescope system, wherein in the active position the rotatable head protrudes at most 1-2 cm with respect to an outer diameter of the insertion tube, measured in radial direction. Thus, sideways space available at the distal end of the insertion tube is increased.
[0035] Another aspect of the invention concerns a borescope inspection kit, comprising an aforementioned borescope system, a display screen, a set of flexible conduits, comprising at least a penetrant application conduit and a developer application conduit, and testing equipment for testing for testing the penetrant and the UV light source.
[0036] Another embodiment relates to an aforementioned borescope inspection kit, further comprising a cleaner application conduit.
[0037] Another embodiment relates to an aforementioned borescope inspection kit, further comprising an etching fluid application conduit.
[0038] Another embodiment relates to a aforementioned borescope inspection kit, wherein the distal tip of the penetrant application conduit, the developer application conduit, the cleaner application conduit or the etching fluid application conduit is provided with a fluid applicator comprising a fluid absorbent material.
[0039] Another embodiment relates to a aforementioned borescope inspection kit, wherein the distal tip of the conduit comprises a plurality of sideways openings, such as 2-4, in particular 3, concentrically arranged around a longitudinal axis of the conduit and arranged to discharge fluid in radial direction, wherein the fluid absorbent material is concentrically arranged over the sideways openings for absorbing the fluid. The inventors have found that such a configuration provides a very even and controllable wetting of the fluid absorbent material.
[0040] Another embodiment relates to an aforementioned borescope inspection kit, wherein the fluid absorbent material has the shape of a cylinder, a ball or a cone, wherein, in case of a cone, the tip of the cone is directed towards the damage during use. The cone or ball shape is particularly useful when applying a fluid to the leading edge or trailing edge of a blade.
[0041] Another embodiment relates to an aforementioned borescope inspection kit, wherein the fluid absorbent material has an outer diameter in radial direction of the distal tip of 2-8 mm, for instance 6-8 mm, such as 7 mm. Thus, even very tight spaces can be reached, such as present inside an APU.
[0042] Another embodiment relates to an aforementioned borescope inspection kit, further comprising a gas drying conduit.
[0043] Another embodiment relates to an aforementioned borescope inspection kit, further comprising a blending scope.
[0044] Another embodiment relates to an aforementioned borescope inspection kit, wherein the flexible conduits comprise an outer flexible spiral with an inner flexible, fluid-proof tube, in case of a fluid conduit, and a composite or plastic tube, in case of the powder developer conduit. Such flexible conduits can be bent at large angles without damage. A composite or plastic conduit can be used in particular with a dry powder developer.
[0045] Another embodiment relates to a aforementioned borescope inspection kit, further comprising a testing device comprising a housing with an opening for receiving the distal end of the insertion tube, wherein, during testing, on one side of the insertion tube the housing comprises a recess for receiving a PSM-5 panel and on the other side of the insertion tube the housing comprises a recess for receiving a UV sensor. This device makes testing of particularly the penetrant easy.
Brief description of the drawings [0046] Embodiments of an aforementioned borescope system and an aforementioned borescope inspection kit according to the invention will by way of non-limiting example be described in detail with reference to the accompanying drawings. In the drawings: [0047] Figure 1 shows a schematic, cross-sectional view of a jet engine for which the method according to the invention is particularly applicable; [0048] Figure 2 shows a side view of a borescope system for use with the method according to the invention; [0049] Figure 3 shows an exemplary embodiment of the distal tip of a conduit comprising a fluid applicator with a fluid absorbent material; [0050] Figure 4 shows an exemplary embodiment of the distal tip of a developer application conduit to be used with a dry powder developer; [0051] Figure 5 shows an exemplary embodiment of a venturi hand-pump for use with the dry powder developer; and [0052] Figure 6 shows an exemplary embodiment of a testing device for testing a penetrant using a PSM-5 panel.
Detailed description of the invention [0053] Figure 1 shows a device 3 in the form of a jet engine. The method according to the invention is especially applicable for use with a jet engine or similar gas turbine. The jet engine 3 is provided with a casing during use (indicated with dashed lines). The casing will be removed, however, before using the method. The jet engine 3 comprises a high pressure compressor (HPC) stage 20 and a high pressure turbine (HPT) stage 19. The method, borescope system and borescope inspection kit according to the invention are especially useful for inspecting the above jet engine stages, in which very tight and narrow spaces are to be encountered. A component to be inspected, in the form of a blade 2, can be seen. The blade 2 has a leading edge 15, a trailing edge 16, a convex side 17 and a concave side 18. Just for illustrative purposes, a schematically indicated amount of surface damage 1 can be seen to be present at the leading edge 15. The flow sections of the jet engine 3 are delimited in radial direction by a gastight housing 5, provided with one or more borescope access openings 6, usually provided per stage, i.e. per stator or rotor stage. According to the invention, a borescope 25 or borescope system 24 is to be inserted into the borescope access opening 6 for inspection of the interior 4 of the device. The borescope 25 comprises a rigid, elongated insertion tube 8. The insertion tube 8 is inserted with its distal end towards the surface damage 1.
[0054] Figure 2 shows a more detailed side view of an embodiment of the borescope system 24 with the borescope 25. The borescope system 24 comprises a borescope 25 with an elongated, rigid insertion tube 8 having a distal end 12 and a proximal end 26. The distal end 12 of the borescope 25 comprises a camera 27, during use to be connected to a display screen via appropriate image transfer means, and a lighting arrangement 28 comprising a conventional light source 29, such as a white light source, and a UY light source 14. The camera 27 and the lighting arrangement 28 are arranged for, respectively, viewing and providing light in a viewing, respectively, lighting, direction perpendicular to a longitudinal axis X of the rigid insertion tube 8. The distal end 12 is provided with a rotatable head 7, rotatable between an inactive position and an active position, around a rotational axis perpendicular to the longitudinal axis X of the rigid insertion tube 8. Any appropriate hinge can be used to achieve rotatability. A flexible conduit 30 comprising a distal tip 9 and a proximal tip 13 is inserted into the proximal end 26 of the insertion tube 8 and slideably received with the distal tip 9 by the rotatable head 7 at the distal end 12. In the active position the rotatable head 7 is rotated away from the longitudinal axis X such that the distal tip 9 extends at an angle (a) to the longitudinal axis X and in the inactive position the rotatable head 7 along with the distal tip 9 is rotated towards the longitudinal axis X, i.e. with respect to the active position. The length of the elongated, rigid insertion tube 8 can be 200-800 mm, such as 300-400 mm, in particular around 360 mm. The rotatable head 7 can preferably be rotated with respect to the longitudinal axis X of the insertion tube 8 at an angle (a) of 0-110°. An outer diameter of the insertion tube 8, measured in radial direction, is preferably 0,3 - 3,0 cm, such as 0,8 - 1,5 cm. The borescope 25 is preferably to be designed in such a way that in the active position the rotatable head 7 protrudes at most 1-2 cm with respect to an outer diameter of the insertion tube 8, measured in radial direction.
[0055] The borescope 25 can be conveniently held with a pistol grip 46. The lower part of the pistol grip 46 is provided with an opening for receiving the flexible conduit 30. The flexible conduit 30 can be pushed towards the proximal end 26 of the insertion tube 8, onwards to the distal end 12. The preferred sequence of the lighting arrangement 28 and the camera 27, when seen from the proximal end 26 towards the distal end 12 of the insertion tube 8, is: conventional (white) light source 29, camera 27, UV light source 14. The UV light source 14 is arranged on a separate UV lead 41. The camera 27 and the conventional light source 29 are arranged on another lead 40.
An adjustable light controller 42 is provided to control lighting conditions. An adjustable rotatable head controller 43, in the form of a rotatable knob, is provided for accurately changing the orientation of the rotatable head 7, i.e. via the rod 48 extending through the insertion tube 8 and connecting to the rotatable head 7. A connecting adapter 44 is connected to the back of the borescope 25 along with a gripper 45, for receiving the lead 40.
[0056] Figure 3 shows a close-up view of the distal tip of any flexible conduit 30 to be used for applying a fluid comprising a fluid applicator 10 with a fluid absorbent material 11. The distal tip 9 comprises a plurality of sideways openings 31, such as 2-4, in particular 3, concentrically arranged around a longitudinal axis of the conduit 30 and arranged to discharge fluid in radial direction. The fluid absorbent material 11 is concentrically arranged over the sideways openings 31 for absorbing the fluid. The fluid absorbent material 11 can comprise a felt, a sponge material or the like. Preferably the fluid applicator 10 is prevented from sliding off the distal tip by a stopper member 39, such as in the form of a flange as shown.
[0057] Figure 4 shows a close-up view of an embodiment of the distal tip 21 of the developer application conduit. The dry powder can be advantageously applied via a plurality of holes 22, in particular 3-6, such as 5, holes 22, arranged at the distal tip 21 of the developer application conduit.
[0058] Figure 5 shows an embodiment of a venturi hand-pump 23, which can be used advantageously for supplying dry powder developer in a controlled manner.
[0059] Figure 6 shows a testing device 32 comprising a housing 33 with an opening 38 for receiving the distal end 12 of the insertion tube 8. On one side of the insertion tube (during insertion thereof in the opening 28) the housing 33 comprises a recess 34, in the form of an elongated groove, for instance extending along an outer surface of the housing 33, for receiving a PSM-5 panel 35 and on the other side of the insertion tube the housing comprises a recess 36, also in the form of an elongated groove, for instance partially extending along an outer surface of the housing 33, for receiving a UV sensor 37.
[0060] Thus, the invention has been described by reference to the embodiments discussed above. It will be recognized that these embodiments are susceptible to various modifications and alternative forms well known to those of skill in the art without departing from the spirit and scope of the invention. Accordingly, although specific embodiments have been described, these are examples only and are not limiting upon the scope of the invention.
List of reference numerals 1. Surface damage 2. Component in the form of a blade 3. Device in the form of a j et engine 4. Interior of the device 5. Housing 6. Borescope access opening 7. Rotatable head 8. Insertion tube 9. Distal tip 10. Fluid applicator 11. Fluid absorbent material 12. Distal end of insertion tube 13. Proximal tip of conduit
14. UV light source in the form of UV LED 15. Leading edge 16. Trailing edge 17. Convex side 18. Concave side 19. HPT stage 20. HPC stage 21. Distal tip of developer application conduit 22. Hole in distal tip of developer application conduit 23. Hand-operated venturi pump 24. Borescope system 25. Borescope 26. Proximal end of insertion tube 27. Camera 28. Lighting arrangement 29. Conventional light source 30. Flexible conduit 31. Sideways opening in distal tip 32. Testing device 33. Housing of testing device 34. Recess for PSM-5 panel 35. PSM-5 panel 36. Recess for UV sensor 37. UV sensor 38. Opening for insertion tube 39. Stopper member 40. Lead for conventional lighting/camera 41. UV lead 42. Adjustable light controller 43. Adjustable rotatable head controller 44. Connecting adapter 45. Gripper 46. Pistol grip 47. Feeder power connector 48. Control rod for rotatable head X = longitudinal axis of insertion tube a = angle of rotatable head

Claims (38)

1. Werkwijze voor het inspecteren en/of repareren van oppervlakteschade (1) van een component (2) in een inwendige (4) van een inrichting (3) omvattende een behuizing (5) met een boroscooptoegangsopening (6) naar het inwendige van de inrichting, onder gebruikmaking van Fluorescerende Penetrant Inspectie (FPI), met een boroscoopinspectiekit volgens een van de conclusies 27-37, omvattend de stappen van: a) het roteren van de roteerbare kop (7) naar een inactieve positie en het inbrengen van de penetrantaanbrengleiding in de inbrengbuis (8), zodanig dat het distale uiteinde (9) verschuifbaar is ontvangen in de roteerbare kop, waarbij het distale uiteinde is voorzien van een vloeistofaanbrengorgaan (10) dat een vloeistofabsorberend materiaal (11) omvat, b) het inbrengen van de inbrengbuis in the toegangsopening, het bewegen van het distale uiteinde (12) naar de schade, het roteren van de roteerbare kop naar de actieve positie en het verschuifbaar aanpassen van de positie van het distale uiteinde, zodat zowel het distale uiteinde als de schade zichtbaar zijn op het beeldscherm, c) het bevochtigen van het vloeistofaanbrengorgaan via het distale uiteinde met penetrant toegevoerd aan het proximale uiteinde (13) van de penetrantaanbrengleiding, en het aanbrengen van de penetrant op de schade door het bewegen van het bevochtigde vloeistofaanbrengorgaan over de schade, d) het roteren van de roteerbare kop naar de inactieve positie, het terugtrekken van de inbrengbuis uit de toegangsopening en het de penetrant toestaan in te trekken, e) het verwijderen van de penetrantaanbrengleiding uit de inbrengbuis, f) het inbrengen van een ontwikkelaaraanbrengleiding in de inbrengbuis, zodat het distale uiteinde verschuifbaar is ontvangen in de roteerbare kop, g) het inbrengen van de inbrengbuis in de toegangsopening en het bewegen van het distale uiteinde naar de schade, het roteren van de roteerbare kop naar de actieve positie en het verschuifbaar aanpassen van de positie van het distale uiteinde, zodat zowel het distale uiteinde als de schade zichtbaar zijn op het beeldscherm, h) het verdelen van een ontwikkelaar over de schade via het distale uiteinde door het toevoeren van een ontwikkelaarsubstantie aan het proximale uiteinde van de ontwikkel aar aanb rengleiding, i) het roteren van de roteerbare kop naar de inactieve positie, het terugtrekken van de inbrengbuis uit de toegangsopening en het de ontwikkelaar toestaan te ontwikkelen, j) het inbrengen van de inbrengbuis van de horoscoop in de toegangsopening, het bewegen van het distale uiteinde naar de schade, zodat de schade zichtbaar is op het beeldscherm, en k) het inspecteren van de schade onder gebruikmaking van de UV lichtbron.Method for inspecting and / or repairing surface damage (1) of a component (2) in an interior (4) of a device (3) comprising a housing (5) with a boroscope access opening (6) to the interior of the device, using Fluorescent Penetrant Inspection (FPI), with a boroscope inspection kit according to any of claims 27-37, comprising the steps of: a) rotating the rotatable head (7) to an inactive position and inserting the penetrant delivery line in the introducer tube (8), such that the distal end (9) is slidably received in the rotatable head, the distal end being provided with a fluid applicator (10) comprising a fluid-absorbing material (11), b) introducing the insertion tube in the access opening, moving the distal end (12) to the damage, rotating the rotatable head to the active position and slidably adjusting the position of the distal onion so that both the distal end and the damage are visible on the display, c) wetting the fluid applicator through the distal end with penetrant supplied to the proximal end (13) of the penetrant applicator line, and applying the penetrant to the damage by moving the wetted fluid applicator over the damage, d) rotating the rotatable head to the inactive position, withdrawing the introducer tube from the access opening and allowing the penetrant to retract, e) removing the penetrant applicator line from the insertion tube, f) inserting a developer delivery line into the insertion tube so that the distal end is slidably received in the rotatable head, g) inserting the insertion tube into the access opening and moving the distal end to the damage, rotating the rotatable head to the active position and slidably adjusting the position of the distal end so that both the distal end and the damage are visible on the display; h) distributing a developer over the damage through the distal end by supplying a developer substance to the proximal end of the developer attachment conduit, i) rotating the rotatable head to the inactive position, withdrawing the insertion tube from the access opening and allowing the developer to develop, j) inserting the insertion tube of the horoscope into the access opening, moving the distal end to the damage, so that the damage is visible on the screen, and k) inspecting the damage using the UV light source. 2. Werkwijze volgens conclusie 1, wanneer gebruik wordt gemaakt van een boroscoopinspectiekit volgens conclusie 28, waarbij vóór stap a), na stap d) of na stap k) , de volgende stappen worden uitgevoerd: l) het roteren van de roteerbare kop naar de inactieve positie en het inbrengen van de reinigeraanbrengleiding in de inbrengbuis, zodat het distale uiteinde verschuifbaar is ontvangen in de roteerbare kop, waarbij het distale uiteinde is voorzien van een vloeistofaanbrengorgaan dat een vloeistofabsorberend materiaal omvat, m) het inbrengen van de inbrengbuis in de toegangsopening en het bewegen van het distale uiteinde naar de schade, het roteren van de roteerbare kop naar de actieve positie en het verschuifbaar aanpassen van de positie van het distale uiteinde, zodat zowel het distale uiteinde als de schade zichtbaar zijn op het beeldscherm, n) het bevochtigen van het vloeistofaanbrengorgaan via het distale uiteinde met reiniger toegevoerd aan het proximale uiteinde (13) van de reinigeraanbrengleiding, en het aanbrengen van de reiniger op de schade door het bewegen van het bevochtigde vloeistofaanbrengorgaan over de schade, o) het roteren van de roteerbare kop naar de inactieve positie, het terugtrekken van de inbrengbuis uit de toegangsopening en het de reiniger toestaan in te trekken, en p) het verwijderen van de reinigeraanbrengleiding uit de inbrengbuis.Method according to claim 1, when use is made of a boroscope inspection kit according to claim 28, wherein before step a), after step d) or after step k), the following steps are performed: l) rotating the rotatable head to the inactive position and insertion of the cleaner applicator line into the insertion tube such that the distal end is slidably received in the rotatable head, the distal end being provided with a liquid applicator comprising a liquid-absorbing material, m) inserting the insertion tube into the access opening and moving the distal end to the damage, rotating the rotatable head to the active position and slidably adjusting the position of the distal end so that both the distal end and the damage are visible on the display, n) wetting of the fluid applicator supplied via the distal end with cleaner to the proximal end (13) of the rein iger applicator line, and applying the cleaner to the damage by moving the wetted liquid applicator over the damage, o) rotating the rotatable head to the inactive position, withdrawing the insertion tube from the access opening and allowing the cleaner to enter and p) removing the cleaner application line from the insertion tube. 3. Werkwijze volgens conclusie 2, waarbij, wanneer de werkwijze volgens conclusie 2 wordt uitgevoerd na stap d), de volgende stappen worden uitgevoerd: q) het inspecteren van de schade onder gebruikmaking van de UV lichtbron (14) voor ‘backglow’ en, in het geval van ‘backglow’, het herhalen van stap n) zo vaak als nodig.A method according to claim 2, wherein, when the method according to claim 2 is carried out after step d), the following steps are performed: q) inspecting the damage using the UV light source (14) for 'backglow', and in the case of 'backglow', repeating step n) as often as necessary. 4. Werkwijze volgens conclusie 1, 2 of 3, wanneer gebruik wordt gemaakt van een boroscoopinspectiekit volgens conclusie 29, waarbij vóór stap 1), wanneer afhankelijk van conclusie 2, of vóór stap a), wanneer afhankelijk van conclusie 1, de volgende stappen worden uitgevoerd: r) het roteren van de roteerbare kop naar een inactieve positie en het inbrengen van de etsvloeistofaanbrengleiding in de inbrengbuis, zodanig dat het distale uiteinde verschuifbaar is ontvangen in de roteerbare kop, waarbij het distale uiteinde is voorzien van een vloeistofaanbrengorgaan dat een vloeistofabsorberend materiaal omvat, s) het inbrengen van de inbrengbuis in de toegangsopening en het bewegen van het distale uiteinde naar de schade, het roteren van de roteerbare kop naar de actieve positie en het verschuifbaar aanpassen van de positie van het distale uiteinde, zodat zowel het distale uiteinde als de schade zichtbaar zijn op het beeldscherm, t) het bevochtigen van het vloeistofaanbrengorgaan via het distale uiteinde met etsvloei stof toegevoerd aan het proximale uiteinde van de etsvloeistofaanbrengleiding, en het aanbrengen van de etsvloeistof op de schade door het bewegen van het bevochtigde vloeistofaanbrengorgaan over de schade, u) het toevoeren van een spoel vloei stof aan het proximale uiteinde om de etsvloeistofaanbrengleiding, het vloeistofaanbrengorgaan en het oppervlakte spoelen totdat de etsvloeistof is verdund tot neutrale pH en het vervolgens verwijderen van de spoelvloeistof uit het vloeistofaanbrengorgaan en de etsvloeistofaanbrengleiding door het verschaffen van zuiging aan het proximale uiteinde, v) het roteren van de roteerbare kop naar de inactieve positie, het terugtrekken van de inbrengbuis uit de toegangsopening en het verwijderen van de etsvloeistofaanbrengleiding uit de inbrengbuis, w) het inbrengen van de gasdroogleiding in de inbrengbuis, zodat het distale uiteinde verschuifbaar is ontvangen in de roteerbare kop, x) het inbrengen van de inbrengbuis in de toegangsopening en het bewegen van het distale uiteinde naar de schade, het roteren van de roteerbare kop naar de actieve positie en het verschuifbaar aanpassen van de positie van het distale uiteinde, zodat zowel het distale uiteinde als de schade zichtbaar zijn op het beeldscherm, y) het verschaffen van een gecomprimeerd gas aan het proximale uiteinde om het oppervlak droog te blazen via het distale uiteinde, z) het roteren van de roteerbare kop naar de inactieve positie, het terugtrekken van de inbrengbuis uit de toegangsopening, en aa) het verwijderen van de gasdroogleiding uit de inbrengbuis.A method according to claim 1, 2 or 3 when a boroscope inspection kit is used according to claim 29, wherein before step 1), when dependent on claim 2, or before step a), when dependent on claim 1, the following steps are r) rotating the rotatable head to an inactive position and inserting the etching fluid application conduit into the insertion tube such that the distal end is slidably received in the rotatable head, the distal end being provided with a fluid applicator comprising a fluid-absorbent material s) inserting the insertion tube into the access opening and moving the distal end to the damage, rotating the rotatable head to the active position and slidably adjusting the position of the distal end so that both the distal end if the damage is visible on the display, t) wetting the liquid applicator through the distal end with etching fluid supplied to the proximal end of the etching fluid application conduit, and applying the etching fluid to the damage by moving the wetted fluid applicator over the damage, u) supplying a coil of fluid to the proximal end about the etching fluid applicator conduit , rinsing the fluid applicator and the surface until the etching fluid is diluted to neutral pH and then removing the rinsing fluid from the fluid applicator and the etching fluid applicator line by providing suction at the proximal end, v) rotating the rotatable head to the inactive position withdrawing the insertion tube from the access opening and removing the etching fluid delivery conduit from the insertion tube, w) inserting the gas drying conduit into the insertion tube so that the distal end is slidably received in the rotatable head, x) inserting the insertion tube into the access opening and moving the distal end to the damage, rotating the rotatable head to the active position and slidably adjusting the position of the distal end so that both the distal end and the damage are visible on the display, y) providing a compressed gas at the proximal end to blow the surface dry through the distal end, z) rotating the rotatable head to the inactive position, withdrawing the insertion tube from the access opening, and aa) removing the gas drying line from the insertion tube. 5. Werkwijze volgens conclusie 4, wanneer gebruik wordt gemaakt van een boroscoopinspectiekit volgens conclusie 35, waarbij vóór het uitvoeren van de werkwijze volgens conclusie 4 de volgende stappen worden uitgevoerd: bb) het roteren van de roteerbare kop naar de inactieve positive, cc) het inbrengen van de inbrengbuis in de toegangsopening, het bewegen van het distale uiteinde naar de schade, zodat de schade zichtbaar is op het beeldscherm, dd) het vaststellen van de afmetingen van de schade onder gebruikmaking van het beeldscherm, om vast te stellen of de afmetingen van de schade binnen opruwbare grenzen (‘blendable limits’) vallen, ee) als vastgesteld wordt dat de afmetingen van de schade binnen de opruwbare grenzen vallen: het roteren van de roteerbare kop naar de inactieve positie, het terugtrekken van de inbrengbuis uit de toegangsopening en het opruwen van de schade onder gebruikmaking van een scoop die geschikt is voor opruwen, die wordt ingebracht door de boroscooptoegangsopening, en, na het opruwen, het verwijderen van de scoop die geschikt is voor opruwen uit de boroscooptoegangsopening.A method according to claim 4, when using a boroscope inspection kit according to claim 35, wherein prior to performing the method according to claim 4 the following steps are performed: bb) rotating the rotatable head to the inactive positive, cc) inserting the insertion tube into the access opening, moving the distal end to the damage so that the damage is visible on the display, dd) determining the dimensions of the damage using the display, to determine whether the dimensions of the damage fall within brush-on limits (ee) if it is determined that the dimensions of the damage fall within the brush-on limits: rotating the rotatable head to the inactive position, withdrawing the insertion tube from the access opening and roughening the damage using a scoop suitable for roughening introduced by the boroscope counter opening, and, after roughening, removal of the scope suitable for roughening from the surgical access opening. 6. Werkwijze volgens een van de voorgaande conclusies, waarbij de inrichting een gasturbinemotor is, in het bijzonder een straalmotor (3).Method according to one of the preceding claims, wherein the device is a gas turbine engine, in particular a jet engine (3). 7. Werkwijze volgens conclusie 6, waarbij de component een blad (2) van een rotor of een stator van de gasturbinemotor is, waarbij het blad een convexe zijde (17), een concave zijde (18), een voorrand (15) en een achterrand (16) heeft.The method of claim 6, wherein the component is a blade (2) of a rotor or a stator of the gas turbine engine, the blade being a convex side (17), a concave side (18), a leading edge (15) and a has a rear edge (16). 8. Werkwijze volgens conclusie 7, waarbij het inwendige van de inrichting een hogedrukturbine (HPT) trap (19) of een hogedrukcompressor (HPC) trap (20) van de gasturbinemotor is en het blad in de HPT- of HPC-trap is gesitueerdThe method of claim 7, wherein the interior of the device is a high pressure turbine (HPT) stage (19) or a high pressure compressor (HPC) stage (20) of the gas turbine engine and the blade is located in the HPT or HPC stage 9. Werkwijze volgens een van de voorgaande conclusies, waarbij een buitendiameter van de inbrengbuis, gemeten in radiale richting, 0,8 -1,5 cm is.A method according to any one of the preceding claims, wherein an outer diameter of the insertion tube, measured in radial direction, is 0.8 -1.5 cm. 10. Werkwijze volgens een van de voorgaande conclusies, waarbij een werkafstand, wanneer de inbrengbuis wordt ingebracht door de toegangsopening en naar de schade wordt bewogen, in een richting loodrecht op de langsas (X) van de inbrengbuis, tussen het distale uiteinde en de oppervlakteschade 0,1-20 cm is, zoals 1-10 cm, in het bijzonder 1-5 cm.A method according to any one of the preceding claims, wherein a working distance, when the insertion tube is inserted through the access opening and moved toward the damage, in a direction perpendicular to the longitudinal axis (X) of the insertion tube, between the distal end and the surface damage Is 0.1-20 cm, such as 1-10 cm, in particular 1-5 cm. 11. Werkwijze volgens een van de voorgaande conclusies, waarbij, wanneer de inbrengbuis wordt ingebracht door de toegangsopening en naar de schade wordt bewogen, de inbrengbuis zich uitstrekt parallel aan een oppervlak (17, 18) dat de oppervlakteschade omvat.The method of any one of the preceding claims, wherein, when the insertion tube is inserted through the access opening and moved toward the damage, the insertion tube extends parallel to a surface (17, 18) that includes the surface damage. 12. Werkwijze volgens een van de voorgaande conclusies, waarbij, wanneer afhankelijk van conclusies 5 en 7, de werkwijze volgens conclusie 5 wordt uitgevoerd op zowel de convexe als concave zijde van het blad.The method of any one of the preceding claims, wherein, when dependent on claims 5 and 7, the method of claim 5 is performed on both the convex and concave sides of the blade. 13. Werkwijze volgens een van de voorgaande conclusies, waarbij, wanneer afhankelijk van conclusie 7, de oppervlakteschade is gesitueerd aan de voorrand of de achterrand van het blad.A method according to any one of the preceding claims, wherein, when dependent on claim 7, the surface damage is situated at the leading edge or the trailing edge of the blade. 14. Werkwijze volgens een van de voorgaande conclusies, waarbij, wanneer afhankelijk van conclusie 4, de hoeveelheid spoelvloeistof ten minste 200 ml is.A method according to any one of the preceding claims, wherein, when dependent on claim 4, the amount of rinsing fluid is at least 200 ml. 15. Werkwijze volgens een van de voorgaande conclusies, waarbij de intrektijd van de penetrant 30 - 120 minuten is.The method of any one of the preceding claims, wherein the penetrant withdrawal time is 30 - 120 minutes. 16. Werkwijze volgens een van de voorgaande conclusies, waarbij de UV lichtbron een UV LED (14) is.The method of any one of the preceding claims, wherein the UV light source is a UV LED (14). 17. Werkwijze volgens een van de voorgaande conclusies, waarbij de ontwikkelaar een droge poederontwikkelaar is.The method of any one of the preceding claims, wherein the developer is a dry powder developer. 18. Werkwijze volgens conclusie 17, waarbij de droge poederontwikkelaar wordt verschaft op een werkafstand tussen het distale uiteinde en de schade van 2-8 mm, in het bijzonder 3-4 mm.A method according to claim 17, wherein the dry powder developer is provided at a working distance between the distal end and the damage of 2-8 mm, in particular 3-4 mm. 19. Werkwijze volgens conclusie 17 of 18, waarbij het droge poeder wordt toegevoerd via een veelheid gaten (22), in het bijzonder 3-6, zoals 5, gaten, aangebracht aan het distale uiteinde (21) van de ontwikkelaaraanbrengleiding.A method according to claim 17 or 18, wherein the dry powder is supplied through a plurality of holes (22), in particular 3-6, such as 5, holes arranged at the distal end (21) of the developer delivery conduit. 20. Werkwijze volgens conclusie 17, 18 of 19, waarbij de droge poederontwikkelaar wordt getransporteerd van het proximale uiteinde naar het distale uiteinde door middel van een venturi-pomp, in het bijzonder een met de hand bedienbare pomp (23).A method according to claim 17, 18 or 19, wherein the dry powder developer is transported from the proximal end to the distal end by means of a venturi pump, in particular a manual pump (23). 21. Werkwijze volgens een van de voorgaande conclusies, waarbij de poederontwikkeltijd 10 - 240 minuten is.The method of any one of the preceding claims, wherein the powder development time is 10 - 240 minutes. 22. Boroscoopsysteem (24) voor gebruik met de werkwijze volgens een van de conclusies 1-21, omvattend een horoscoop (25) met een langwerpige, starre inbmegbuis (8) met een distaai uiteinde (12) en een proximaal uiteinde (26), waarbij het distale uiteinde van de horoscoop een camera (27) omvat, tijdens gebruik verbonden met een beeldscherm, en een verlichtingsinrichting (28) omvattend een conventionele lichtbron (29) en een UV lichtbron (14), waarbij de camera en de verlichtingsinrichting zijn ingericht voor, respectievelijk, het bekijken en het verschaffen van licht in een kijkrichting, respectievelijk verlichtingsrichting, loodrecht op de langsas (X) van de inbrengbuis, waarbij het distale uiteinde is voorzien van een roteerbare kop (7), roteerbaar tussen een inactieve positie en een actieve positie, rond een rotatieas loodrecht op de langsas van de inbrengbuis, waarbij een flexibele leiding (30) een distaai uiteinde (9) en een proximaal uiteinde (13) omvat dat inbrengbaar is in het proximale uiteinde van de inbrengbuis voor verschuifbare ontvangst van het distale uiteinde door de roteerbare kop aan het distale uiteinde, waarbij in de actieve positie de roteerbare kop is weggeroteerd van de langsas zodat het distale uiteinde zich onder een hoek (a) uitstrekt ten opzichte van de langsas en in de inactieve positie de roteerbare kop tezamen met het distale uiteinde naar de langsas is geroteerd ten opzichte van de actieve positie.A boroscope system (24) for use with the method of any one of claims 1-21, comprising a horoscope (25) with an elongated, rigid insertion tube (8) with a distal end (12) and a proximal end (26), the distal end of the horoscope comprising a camera (27) connected to a display during use, and a lighting device (28) comprising a conventional light source (29) and a UV light source (14), the camera and the lighting device being arranged for, respectively, viewing and providing light in a viewing direction, respectively lighting direction, perpendicular to the longitudinal axis (X) of the insertion tube, the distal end being provided with a rotatable head (7) rotatable between an inactive position and a active position, about an axis of rotation perpendicular to the longitudinal axis of the insertion tube, wherein a flexible conduit (30) comprises a distal end (9) and a proximal end (13) that can be inserted into the p roximal end of the insertion tube for slidable reception of the distal end by the rotatable head at the distal end, the rotatable head being rotated away from the longitudinal axis in the active position so that the distal end extends at an angle (a) with respect to the longitudinal axis and in the inactive position the rotatable head is rotated together with the distal end toward the longitudinal axis relative to the active position. 23. Boroscoopsysteem volgens conclusie 22, waarbij de langwerpige, starre inbrengbuis een lengte heeft van 200-800 mm, zoals 300-400 mm, in het bijzonder rond de 360 mm.Boroscope system according to claim 22, wherein the elongated, rigid insertion tube has a length of 200-800 mm, such as 300-400 mm, in particular around 360 mm. 24. Boroscoopsysteem volgens conclusie 22 of 23, waarbij de roteerbare kop geroteerd kan worden ten opzichte van de langsas van de inbrengbuis onder een hoek (a) van 0-110°.24. Boroscope system according to claim 22 or 23, wherein the rotatable head can be rotated relative to the longitudinal axis of the insertion tube at an angle (a) of 0-110 °. 25. Boroscoopsysteem volgens een van de conclusies 22-24, waarbij een buitendiameter van de inbrengbuis, gemeten in radiale richting, 0,8 - 1,5 cm is.A boroscope system according to any of claims 22-24, wherein an outer diameter of the insertion tube, measured in radial direction, is 0.8 - 1.5 cm. 26. Boroscoopsysteem volgens een van de conclusie 22-25, waarbij in de actieve positie de roteerbare kop ten hoogste 1-2 cm uitsteekt ten opzichte van de een buitendiameter van de inbrengbuis, gemeten in radiale richting.A boroscope system according to any of claims 22-25, wherein in the active position the rotatable head projects at most 1-2 cm with respect to the outer diameter of the insertion tube, measured in radial direction. 27. Boroscoopinspectiekit, omvattend een boroscoopsysteem volgens een van de conclusies 22-26, een beeldscherm, een set flexibele leidingen (30), omvattend ten minste een penetrantaanbrengleiding en een ontwikkelaaraanbrengleiding, en testapparatuur voor het testen van de penetrant en de UV lichtbron.A boroscope inspection kit comprising a boroscope system according to any of claims 22-26, a display, a set of flexible conduits (30), comprising at least one penetrant applicator and a developer applicator, and testing equipment for testing the penetrant and the UV light source. 28. Boroscoopinspectiekit volgens conclusie 27, voorts omvattend een reinigeraanbrengleiding.The boroscope inspection kit of claim 27, further comprising a cleaner applicator. 29. Boroscoopinspectiekit volgens conclusie 27 of 28, voorts omvattend een etsvloei stofaanbrengl ei ding.The boroscope inspection kit of claim 27 or 28, further comprising an etching fluid applicator. 30.30. Boroscoopinspectiekit volgens conclusie 27, 28 of 29, waarbij het distale uiteinde van de penetrantaanbrengleiding, de ontwikkelaaraanbrengleiding, de reinigeraanbrengleiding of de etsvloeistofaanbrengleiding is voorzien van een vloeistofaanbrengorgaan (10) dat een vloeistofabsorberend materiaal (11) omvat. 31 Boroscoopinspectiekit volgens conclusie 30, waarbij het distale uiteinde van de leiding een veelheid aan zijdelingse openingen (31) omvat, zoals 2-4, in het bijzonder 3, concentrisch aangebracht rond een langsas van de leiding en ingericht voor het doen uitstromen van vloeistof in radiale richting, waarbij het vloeistofabsorberende materiaal concentrisch is aangebracht over de zijdelingse openingen voor het absorberen van de vloeistof.Boroscope inspection kit according to claim 27, 28 or 29, wherein the distal end of the penetrant applicator line, the developer applicator line, the cleaner applicator line or the etching fluid applicator line is provided with a fluid applicator (10) comprising a fluid absorbent material (11). Boroscope inspection kit according to claim 30, wherein the distal end of the conduit comprises a plurality of lateral openings (31), such as 2-4, in particular 3, concentrically arranged about a longitudinal axis of the conduit and adapted to cause fluid to flow out into radial direction, wherein the liquid-absorbing material is arranged concentrically over the lateral openings for absorbing the liquid. 32. Boroscoopinspectiekit volgens conclusie 30 of 31, waarbij het vloeistofabsorberende materiaal de vorm van een cilinder, een bal of een kegel heeft, waarbij, in het geval van een kegel, de punt van de kegel tijdens gebruik naar de schade wordt gericht.A boroscope inspection kit according to claim 30 or 31, wherein the fluid-absorbing material is in the form of a cylinder, a ball or a cone, wherein, in the case of a cone, the tip of the cone is directed towards the damage during use. 33. Boroscoopinspectiekit volgens conclusie 30, 31 of 32, waarbij het vloeistofabsorberende materiaal een buitendiameter heeft in radiale richting ten opzichte van het distale uiteinde van 2-8 mm, bijvoorbeeld 6-8 mm, zoals 7 mm.A boroscope inspection kit according to claim 30, 31 or 32, wherein the fluid-absorbing material has an outer diameter in radial direction with respect to the distal end of 2-8 mm, for example 6-8 mm, such as 7 mm. 34. Boroscoopinspectiekit volgens een van de conclusies 27-33, voorts omvattend een gasdroogleiding.A boroscope inspection kit according to any of claims 27-33, further comprising a gas drying line. 35. Boroscoopinspectiekit volgens een van de conclusies 27-34, voorts omvattend een scoop die geschikt is voor opruwen (‘blending’).A boroscope inspection kit according to any of claims 27-34, further comprising a scoop suitable for roughening ("blending"). 36. Boroscoopinspectiekit volgens een van de conclusies 27-35, waarbij de flexibele leidingen een buitenste flexibele spiraal omvatten met een binnenste flexibele, vloeistofbestendige buis, in het geval van een vloei stofl ei ding, en een composiet of kunststof buis, in het geval van de poederontwikkelaarleiding.A boroscope inspection kit according to any of claims 27-35, wherein the flexible conduits comprise an outer flexible coil with an inner flexible, liquid-resistant tube, in the case of a liquid line, and a composite or plastic tube, in the case of the powder developer line. 37.37. Boroscoopinspectiekit volgens een van de conclusies 27-36, voorts omvattend een testinrichting (32) omvattend een behuizing (33) met een opening (38) voor het ontvangen van het distale uiteinde van de inbrengbuis, waarbij, tijdens testen, aan een zijde van de inbrengbuis de behuizing een uitsparing (34) omvat voor het ontvangen van een PSM-5 paneel (35) en aan de andere zijde van de inbrengbuis de behuizing een uitsparing (36) omvat voor het ontvangen van een UV-sensor (37).Boroscope inspection kit according to any of claims 27-36, further comprising a testing device (32) comprising a housing (33) with an opening (38) for receiving the distal end of the insertion tube, wherein, during testing, on one side of the insertion tube the housing comprises a recess (34) for receiving a PSM-5 panel (35) and on the other side of the insertion tube the housing comprises a recess (36) for receiving a UV sensor (37).
NL2013769A 2014-11-11 2014-11-11 Method for inspecting and/or repairing surface damage of a component in an interior of a device, using fluorescent penetrant inspection (FPI), as well as borescope system and borescope inspection kit. NL2013769B1 (en)

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PCT/NL2015/050741 WO2016076704A1 (en) 2014-11-11 2015-10-26 Method for inspecting and/or repairing surface damage of a component in an interior of a device, using fluorescent penetrant inspection (fpi), as well as a borescope inspection kit

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