US20100224603A1 - Method for production of safety/rupture discs having pre-calculated breaking threshold - Google Patents

Method for production of safety/rupture discs having pre-calculated breaking threshold Download PDF

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Publication number
US20100224603A1
US20100224603A1 US12/663,622 US66362207A US2010224603A1 US 20100224603 A1 US20100224603 A1 US 20100224603A1 US 66362207 A US66362207 A US 66362207A US 2010224603 A1 US2010224603 A1 US 2010224603A1
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US
United States
Prior art keywords
laser beam
plate
cut
notch
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US12/663,622
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English (en)
Inventor
Mario Modena
Antonio Ruggero Sante Donadon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DONADON SAFETY DISCS AND DEVICES Srl
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DONADON SAFETY DISCS AND DEVICES Srl
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Application filed by DONADON SAFETY DISCS AND DEVICES Srl filed Critical DONADON SAFETY DISCS AND DEVICES Srl
Assigned to DONADON SAFETY DISCS AND DEVICES S.R.L. reassignment DONADON SAFETY DISCS AND DEVICES S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MODENA, MARIO, SANTE DONADON, ANTONIO RUGGERO
Publication of US20100224603A1 publication Critical patent/US20100224603A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
    • F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/362—Laser etching
    • B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove

Definitions

  • the present invention relates to a method for production of safety/rupture discs having a pre-calculated breaking threshold.
  • the present invention is advantageously used in producing devices applied to plants along pneumatic or hydraulic lines to ensure the necessary safety measures of the plant itself which can be submitted to conditions different from the design ones.
  • Such devices are applied to emergency lines to fully close the duct on which they are applied.
  • a high-pressure fluid acts in one of the half-spaces defined by the device, while the opposite half-space is acted upon by a lower pressure, typically the atmospheric one.
  • the safety devices of known type can protect plants operating at sub-atmospheric pressure.
  • the device is submitted to a pressure difference acting between the two opposite faces of same.
  • this device opens by tearing and allows the fluid under pressure to go beyond the safety device so as to flow out of the plant. In this manner, a possible and undesirable pressure excess is not able to damage other parts of the plant.
  • the safety devices to which reference is made have a disc-shaped configuration with a surface on which the fluid under pressure acts, which surface can be flat, concave or convex.
  • said devices have a square or rectangular shape depending on the duct onto which they have to be applied.
  • these devices can have a plurality of non-through cuts disposed on a surface of the device in a suitable configuration so as to define corresponding frangible lines of pre-established rupture.
  • the safety device tears at said frangible lines of pre-established rupture.
  • the cut sizes are selected as a function of the value of the pre-established pressure threshold to which the device must break. Undesirable mechanical alterations and/or alterations in the crystalline structure that on the other hand can be hardly evaluated, can modify this threshold value. In this manner, the safety device starts operating before or after achievement of this value.
  • cuts are mainly made mechanically.
  • cuts can be made by permanent set through use of punches and related counter-punches or moulds and counter-moulds
  • cuts are made by micro-milling. In other words, a portion of the material is mechanically removed with great accuracy.
  • cutting methods are known that use. a laser beam.
  • the device is previously covered with a layer of protective material.
  • the laser beam traces the lines to be cut directly in the protective layer and not in the metal.
  • the cuts are then actually made by an electrical-polishing process. Removal of the metal material takes place by an electrolytic method (electrical polishing). Finally, the protective material layer is removed.
  • the technical task of the present invention is to provide a method for production of a safety device with pre-calculated breaking threshold that is devoid of the mentioned drawbacks.
  • FIG. 1 is a perspective view of a safety device made by a method in accordance with the present invention
  • FIG. 2 represents a section view of the device seen in FIG. 1 taken along line II-II;
  • FIG. 3 represents a perspective view of a first alternative embodiment of the device in FIG. 1 ;
  • FIG. 4 is a section view of the device in FIG. 3 taken along line IV-IV;
  • FIG. 5 is a perspective view of a second alternative embodiment of the device in FIG. 1 ;
  • FIG. 6 is a section view of the device in FIG. 5 taken along line VI-VI;
  • FIG. 1 is a perspective view of a third embodiment of the device in FIG. 1 ;
  • FIG. 8 is a section view of the device in FIG. 7 taken along line VIII-VIII.
  • a safety device with pre-calculated breaking threshold made following a method in accordance with the invention has been generally identified with 1 .
  • the safety device 1 is mounted in pneumatic or hydraulic plants along safety ducts.
  • the safety device, 1 fully closes the port of the duct onto which it is applied and comprises a first surface 1 a on which a fluid under pressure acts and a second surface 1 b on which a pressure of the external environment acts.
  • this pressure is the atmospheric one.
  • the safety device 1 will open by tearing so as to enable transit of the fluid in the safety duct and allow discharge of an excess pressure into an external environment.
  • the safety device 1 will start working when the vacuum acting on surface 1 a is too high. In this way, the safety device 1 prevents sudden pressure changes beyond the design limits from giving rise to breaking and/or failures in other components of the plant.
  • the safety device 1 comprises a plate 2 that can have different shapes depending on the shape of the duct onto which it has to be applied.
  • plate 2 can be either of a substantially disc-shaped conformation (as shown in the drawings) or of a rectangular or square shape.
  • Plate 2 comprises a peripheral portion 3 defining a coupling flange with a duct and a central portion 4 designed to open when the pressure threshold value is exceeded.
  • the safety device 1 further comprises at least one notch or cut 5 formed in a metallic surface 2 a of plate 2 along a working line.
  • the safety device 1 comprises four cuts 5 of rectilinear shape disposed in an axially symmetric configuration.
  • the number, shape and arrangement can vary depending on the operating requirements.
  • cuts 5 are formed in the second surface 2 b of the safety device 1 , i.e. on the surface on which the pressure of the surrounding environment acts.
  • Cuts 5 can also be formed on the first surface 2 a of the safety device 1 , i.e. on the surface acted upon by the fluid under pressure.
  • Plate 2 is made of metal material, such as stainless steel, nickel, aluminium or other metals or particular metal alloys.
  • the safety device 1 further comprises at least one breaking initiation region 6 that is placed close to the centre of plate 2 .
  • This breaking initiation region 6 comprises a portion of plate 2 marked by a plate thickness lower than an average thickness of the whole plate 2 or by a region in which the plate 2 structure is weakened by effect of localised heating.
  • the breaking initiation region 6 appears as a weakening region from which the breaking process starts with overturning of the convex portion.
  • the safety device 1 may comprise a plurality of breaking initiation regions 6 located at each cut 5 .
  • the breaking initiation region 6 can be formed on the first surface 2 a of the safety device 1 or on the second surface 2 b thereof. Alternatively, a plurality of breaking initiation regions 6 can be formed both on the first 1 a and on the second 1 b surfaces.
  • the safety device 1 comprises a single breaking initiation region 6 located close to the plate centre.
  • the safety device 1 can be such shaped that the peripheral portion 3 and central portion 4 are in coplanar relationship ( FIGS. 1 and 2 ).
  • the central portion 4 has an arched-section shape so that the first surface 2 a of the safety device 1 has a concavity facing the half-space where the fluid under pressure acts and the second surface 2 b of the safety device 1 has a convexity facing the half-space where the pressure of the external environment acts.
  • FIGS. 5 to 8 Shown in FIGS. 5 to 8 is a safety device 1 of the reverse type.
  • the central portion 4 has an arched-section shape in such a manner that the first surface 2 a of the safety device 1 has a convexity facing the half-space where the fluid under pressure acts and the second surface 2 b of the safety device 1 has a concavity facing the half-space where the pressure of the external environment acts.
  • pressure acts in such a manner that the central portion 4 of plate 2 works by compression.
  • the device 1 of the reverse type is particularly adapted for use when the acting pressure varies in a cyclic manner because the cyclic stresses do not give rise to modifications in the crystalline-metallurgic structure, due to fatigue.
  • the safety devices 1 of the reverse type can comprise a plurality of radial cuts disposed axially symmetric ( FIGS. 5 and 6 ). These cuts 5 are made in the first 2 a or the second 2 b surfaces of the safety device 1 . Alternatively, cuts 5 can be formed in both surfaces.
  • the safety devices 1 of the reverse type comprise a peripheral cut 5 preferably in the form of an arc of a circle and disposed close to the periphery of the central portion 4 of plate 2 . ( FIGS. 7 and 8 ).
  • the peripheral cut 5 has a first 5 a and a second 5 b ends facing each other.
  • a connecting region 9 is defined between said ends. Said connecting region 9 is disposed close, to the periphery of the central portion 4 of plate 2 where the only cut 5 is interrupted.
  • the peripheral cut 5 originates from the connecting region 9 , extends along the periphery of the central portion 4 and terminates close to the connecting region 9 itself.
  • This connecting region 9 has the task of retaining the torn portion of plate 2 once the pressure threshold limit has been reached and exceeded. In this way, there is no full separation of the torn portion from the safety device 1 .
  • this connecting region 9 can be reinforced, by thickening of plate 2 for example (not shown).
  • the depth of the peripheral cut 5 varies and increases on moving away from said ends 5 a, 4 b of the peripheral cut 5 .
  • the peripheral-cut depth increases from the connecting region 9 where it is minimum, to a region diametrically opposite to the connecting region 9 itself, where it is maximum ( FIG. 8 ).
  • the breaking process can start with easy (once the pressure threshold value has been overcome and overturning of the concavity has been carried out).
  • the breaking process extends along the peripheral cut 5 until reaching the connecting region 9 , at both stretches of the peripheral cut 5 .
  • the breaking process is hindered by the reduction in the peripheral cut 5 depth.
  • this helps in avoiding full separation of the broken portion from the safety device 1 .
  • a region 7 of deformation initiation may be advantageously present.
  • this type of device is deformed before tearing by the excess pressure, until overturning of its concavity is caused. Only after this step, the safety device 1 opens by tearing.
  • the region 7 of deformation initiation can include a region of the central portion 4 of plate 2 which is locally provided with a concavity opposite to that of plate 2 .
  • this region 7 of deformation initiation has a concavity facing the half-space where the fluid under pressure acts.
  • This region 7 of deformation initiation is preferably located centrally in plate 2 or close to said centre.
  • the method for production or the safety device 1 takes place by providing plate 2 having said metallic surface 2 a.
  • this step is preliminary to a step of forming cuts 5 .
  • the laser source used can be a neodymium vanadium crystal source or a source of another type.
  • the power applied to plate 2 by the laser beam is included between 10 and 80 W, preferably between 20 and 60 W, most preferably between 35 and 45 W; an average power is substantially as high as 40 W, for example.
  • the laser beam 8 used has a wavelength included between 1000 and 1100 nm. Preferably, this wavelength is substantially of 1064 nm.
  • the laser beam 8 used is advantageously of the pulsed type in order to enable power transfer to plate 2 in an efficient manner.
  • the pulse duration is included between 10 and 80 ns.
  • the method also contemplates carrying out of a plurality of passages of the laser beam at the frangible line to be defined.
  • cuts 5 with very precise depth and width can be defined which are reproducible but can vary depending on the number of the passages carried out.
  • the first passage of the laser beam 8 makes the frangible line being defined dull, and eliminates the reflection problems of the laser beam 8 of the following passages.
  • the displacement speed of the laser beam 8 along the metallic surface 2 a varies between 100 and 300 mm/s, preferably between 150 and 250 mm/s. Preferably this transfer speed is of 200 mm/s.
  • the lower limit of this range is very important because too reduced passage speeds give rise to overheating of plate 2 which may also bring about variations in the mechanical features of plate 2 and impair the working reproducibility.
  • the above enables creation of cuts 5 the depth of which decreases from the centre to the periphery of the safety device 1 to facilitate opening of the safety device 1 and limit the risk of torn parts of the device being detached.
  • a single cut 5 of a varying depth can be made in accordance with the embodiment described in FIGS. 7 and 8 .
  • the regions of breaking initiation 6 too can be advantageously created by laser radiation.
  • the laser beam 8 can remove a portion of a varying depth between 1 and 50 microns and a diameter included between 1 and 100 mm.
  • the step of creating the region 7 of deformation initiation is advantageously obtained by laser radiation as well.
  • This laser radiation is conveyed onto plate 2 which is such shaped that its convexity is turned towards the fluid under pressure.
  • the radiation is conveyed close to the centre of plate 2 .
  • this region 7 of deformation initiation is made by modification of the crystalline-metallurgic structure due to the only thermal variation induced by laser radiation.
  • cut 5 with a varying depth can also be made using other methods in accordance with particular current requirements.
  • Plate 2 is of circular shape, is made of nickel and has four radial cuts.
  • the original average thickness of plate 2 is 0.4 mm.
  • the cuts were obtained by a pulsed laser beam 8 with an average power of 40 W and a frequency of 40 kHz.
  • the passage speed is 200 mm/s and five passages for each cut 5 were made. Cuts 5 have a depth of 25 microns and a width of 70 microns and were made in a work time of 7.5 seconds.
  • the invention achieves the intended purposes and has important advantages.
  • the described method enables safety devices 1 to be made which have constant and easily reproducible features.
  • the described method can be easily adapted to all requirements in terms of geometry and sizes of the cuts.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Safety Valves (AREA)
  • Laser Beam Processing (AREA)
US12/663,622 2007-06-18 2007-06-18 Method for production of safety/rupture discs having pre-calculated breaking threshold Abandoned US20100224603A1 (en)

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Application Number Priority Date Filing Date Title
PCT/IT2007/000433 WO2008155783A1 (en) 2007-06-18 2007-06-18 Method for production of safety /rupture discs having pre -calculated breaking threshold

Related Parent Applications (1)

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PCT/IT2007/000433 A-371-Of-International WO2008155783A1 (en) 2007-06-18 2007-06-18 Method for production of safety /rupture discs having pre -calculated breaking threshold

Related Child Applications (1)

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US13/187,673 Continuation-In-Part US8674260B2 (en) 2007-06-18 2011-07-21 Method for production of safety/rupture discs

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US13/187,673 Expired - Fee Related US8674260B2 (en) 2007-06-18 2011-07-21 Method for production of safety/rupture discs

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US (2) US20100224603A1 (pl)
EP (1) EP2164674B1 (pl)
ES (1) ES2622413T3 (pl)
PL (1) PL2164674T3 (pl)
PT (1) PT2164674T (pl)
SI (1) SI2164674T1 (pl)
WO (1) WO2008155783A1 (pl)

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US20130056085A1 (en) * 2009-09-30 2013-03-07 John Tomasko Rupture disk
DE102013100509A1 (de) 2012-01-20 2013-07-25 Rofin-Baasel Lasertech Gmbh & Co. Kg Verfahren zum Herstellen einer Berstscheibe
WO2014014741A1 (en) * 2012-07-18 2014-01-23 Fike Corporation Rupture disc having laser-defined reversal initiation and deformation control features
WO2014070827A1 (en) * 2012-10-31 2014-05-08 Fike Corporation Pressure relief device having a laser-defined line of opening
US20140238984A1 (en) * 2013-02-28 2014-08-28 Fike Corporation Rupture disc having laser-defined line of weakness with disc opening and anti-fragmentation control structures
WO2014141307A1 (en) * 2013-03-12 2014-09-18 Donadon Safety Discs And Devices S.R.L. Safety discs
WO2015017127A1 (en) 2013-07-29 2015-02-05 Fike Corporation Creation of laser-defined structures on pressure relief devices via tiling method
WO2015161261A1 (en) * 2014-04-17 2015-10-22 Fike Corporation Reverse-acting rupture disc with buckling-control feature
US20160146363A1 (en) * 2013-04-25 2016-05-26 Bs&B Innovation Limited Frustum-shaped rupture disk having line of weakness
RU2617385C2 (ru) * 2012-08-16 2017-04-24 Самсунг Электроникс Ко., Лтд. Гибкое устройство отображения и способ обеспечения обратной связи для него
DE102015221738A1 (de) * 2015-11-05 2017-05-11 Robert Bosch Gmbh Vorrichtung und Verfahren zur Erhöhung der Sicherheit beim Gebrauch von Batteriesystemen und Berstvorrichtungen
JP6151424B1 (ja) * 2016-12-22 2017-06-21 株式会社ブイテックス 溝付き破裂板の加工方法
CN113857684A (zh) * 2021-11-01 2021-12-31 西安航天动力研究所 一种金属膜片ω形刻痕的皮秒激光刻蚀加工方法
US11396952B2 (en) * 2017-10-12 2022-07-26 Bs&B Innovations Limited Rupture disk
US20220341502A1 (en) * 2021-04-26 2022-10-27 Donaldson Company, Inc. Polymeric rupture disk system
US20220356957A1 (en) * 2019-09-09 2022-11-10 Mayra GUZMAN Pressure relief device
US11502369B2 (en) * 2017-01-27 2022-11-15 Gs Yuasa International Ltd. Rupture valve and energy storage device

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PL2164674T3 (pl) 2007-06-18 2017-07-31 Donadon Safety Discs And Devices S.R.L. Sposób produkcji płyt bezpieczeństwa / pękających o wcześniej obliczonym progu pękania
US8636164B2 (en) 2008-12-10 2014-01-28 Continental Disc Corporation Controlling the rated burst pressure of a rupture disc through the use of control scores on the disc dome
US20100140238A1 (en) * 2008-12-10 2010-06-10 Continental Disc Corporation Machining score lines in a rupture disc using laser machining
US10036373B2 (en) * 2014-03-11 2018-07-31 Ge-Hitachi Nuclear Energy Americas Llc Thermal pumping via in situ pipes and apparatus including the same
ES2805239T3 (es) * 2015-04-28 2021-02-11 Donadon Safety Discs And Devices S R L Dispositivo de seguridad para tuberías con resistencia mejorada al desprendimiento de pétalos
EP3289258B1 (en) * 2015-04-28 2020-06-10 Donadon Safety Discs and Devices S.R.L. A safety or rupture element for a pipeline and method for making said element
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SI2164674T1 (sl) 2017-10-30
EP2164674B1 (en) 2017-01-25
PL2164674T3 (pl) 2017-07-31
WO2008155783A9 (en) 2009-03-05
US20120012571A1 (en) 2012-01-19
WO2008155783A1 (en) 2008-12-24
ES2622413T3 (es) 2017-07-06
EP2164674A1 (en) 2010-03-24
PT2164674T (pt) 2017-03-23

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