CN113513972A - Waterproof washing seal installation method for sensor installed on heat transfer pipe - Google Patents
Waterproof washing seal installation method for sensor installed on heat transfer pipe Download PDFInfo
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- CN113513972A CN113513972A CN202110293695.7A CN202110293695A CN113513972A CN 113513972 A CN113513972 A CN 113513972A CN 202110293695 A CN202110293695 A CN 202110293695A CN 113513972 A CN113513972 A CN 113513972A
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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Abstract
The invention discloses a waterproof scouring seal installation method of a sensor installed on a heat transfer pipe, wherein the sensor is installed in the heat transfer pipe and accurately fixed, and the installed sensor can resist long-term high-speed running water scouring without loosening and losing efficacy; the process method of multilayer coating of the surface of the strain gauge with waterproof glue, tightening of the surface of the strain gauge with a waterproof heat-shrinkable tube, anti-loose binding of PE wires and gluing of a connector lug is adopted, so that the problem of high-speed transverse flowing water scouring prevention protection of the strain gauge attached to the surface of a heat transfer tube in a narrow and densely-arranged tube bundle is solved; the lead of the strain gauge on the surface of the heat transfer pipe is protected by waterproof washing and sealing, so that the failure caused by the fact that the lead is broken by washing of transverse high-speed running water is solved, and the test error caused by the fact that the lead swings randomly along with the running water is solved; the sensor lead wire is protected in a waterproof and washing-out sealing mode on the surfaces of metal bodies in various shapes, and the problem that the lead wire is easy to break and lose efficacy due to the fact that the sensor lead wire is waterproof in a water-passing body and high-speed running water washes for a long time is solved.
Description
Technical Field
The invention relates to the technical field of installation of sensors in heat transfer tube bundles of a steam generator, in particular to a waterproof washing seal installation method of a sensor installed on a heat transfer tube.
Background
The working principle of the nuclear power station is as follows: the nuclear fuel of the reactor core of the nuclear power station reactor is excited by neutron irradiation to generate chain fission, huge energy released in the process of chain fission is driven by a main pump to enter coolant of a primary loop of the reactor, the coolant flows out after flowing through the reactor core, the coolant flows out from an outlet pipe of a reactor container to enter a steam generator, heat is transferred to water of two loops under the condition of physical isolation, the water of the two loops is heated to generate steam, and the steam drives a steam turbine, so that a generator coaxial with the steam turbine is driven to generate electricity. Therefore, the steam generator is one of the key devices for transferring and converting heat energy in the power generation process of the nuclear power plant, and the safe and reliable design of the steam generator involves the safe operation of the nuclear power plant.
The steam generator is a primary circuit main device of the pressurized water reactor nuclear power station, is a junction for connecting a primary circuit and a secondary circuit, and has the risk of vibration failure caused by induced flow due to long-term flow scouring of a steam-water mixture. The failure mechanism of flow-induced vibration is various, such as vortex shedding, turbulent excitation, fluid bomb instability and the like, and particularly, the failure of the fluid bomb instability can cause abrasion and breakage of the heat transfer pipe. Therefore, it is necessary to develop a flow-induced vibration mechanism test study of the heat transfer tube bundle of the steam generator, and through the test study, the design is further optimized, so that the occurrence of a severe event of the rupture of the heat transfer tube is avoided, and the improvement of the operation reliability of the equipment is very important.
The experimental research of the steam generator heat transfer pipe beam induced vibration mechanism is developed, and a heat transfer pipe beam induced vibration test piece needs to be designed to complete the experimental research. The original shape and size of the steam generator are huge, and the installation space of the experiment bench cannot meet the installation requirement, so that a part of the structure of the steam generator prototype is generally intercepted and used as a test piece. A plurality of test points are arranged in the heat transfer tube bundle, and various sensors arranged on the surface of the tube and in the tube are used for acquiring mechanical parameters required by flow-induced vibration analysis, such as vibration amplitude, vibration acceleration, vibration frequency, strain parameters and the like.
Typically, the test piece employs a closely packed array of heat transfer tube bundle assemblies in place of the steam generator. In the test piece, the outer diameter of a single heat transfer pipe is smaller than 18cm, the wall thickness of the pipe is 1 mm-1.2 mm, heat transfer pipe bundles are arranged according to a prototype array of a steam generator to form densely arranged pipe bundle assemblies, and the gaps among the pipes are in millimeter level.
When a steam generator heat transfer tube bundle test body is subjected to flow-induced vibration test, the test body is limited by narrow internal structure space and high-speed flowing water scouring severe environment, the set vibration parameter test points are very limited, the types and the number of the mounted sensors are also very limited, and generally, acceleration sensors and heat transfer tube surface stress concentration areas are required to be mounted in a plurality of heat transfer tubes to be pasted with waterproof strain gauges. Installing an accelerometer in the selected straight pipe section heat transfer pipe (limited to the straight pipe section), and fixing the accelerometer in the heat transfer pipe from outside to inside by adopting screws; a plurality of heat transfer pipe stress concentration areas are selected in the boundary area of a test piece to serve as stress test points, strain gauges are pasted along the circumferential direction of the pipes, and rubber sleeves are sleeved on the surfaces of the strain gauges to isolate and protect the strain gauges from being damaged by transverse high-speed flowing water scouring.
The method for mounting the sensor on the heat transfer pipe in the flow-induced vibration test of the conventional steam generator heat transfer pipe bundle test body has the following defects:
1. in the screw fixing mode of the acceleration sensor in the heat transfer pipe, the bottom plane of the screw head cannot be completely attached to the small-curvature curved surface on the surface of the heat transfer pipe, and a gap exists, so that complete waterproof sealing is difficult to realize on site by the structure; along with the continuous progress of the test, the random vibration can increase the gap between the screw and the wall of the heat transfer pipe, and can cause water flowing outside the pipe to enter the pipe from the gap at the position of the fixing screw in the test process, so that additional vibration test interference is introduced, the authenticity of vibration test parameters of the heat transfer pipe is influenced, and the test requirement of ensuring no water in the heat transfer pipe in the whole test progress cannot be met;
2. the structural shape of the screw head occupies certain flow field space between the heat transfer pipes, the structure of a narrow flow field between the heat transfer pipes is damaged, and the authenticity of the test is influenced;
3. the screw end is washed by high-speed running water for a long time, so that the screw is loosened to cause loosening failure;
4. by adopting the process method of isolating and protecting the surface of the strain gauge by the rubber sleeve, the rubber sleeve can be aged, cracked or crushed to fail quickly in deionized water and can not bear the test requirement of being subjected to high-speed washing of the deionized water for a long time in the test;
5. the lead wire of the strain gauge is wired on the surface of the heat transfer pipe to lead out a water passing body, and the lead wire is easily broken by transverse flowing water flowing on the surface of the heat transfer pipe at high speed to cause test failure by adopting an enameled wire binding method with equal spacing;
6. when the lead of the installed sensor goes out of the water body, the lead is suspended in water or goes out of the lead pipe on the wall of the body, the lead randomly swings due to turbulence and other flow-induced phenomena caused by high-speed flowing water, so that test errors are introduced, and the lead of the sensor is easily broken by flowing water in the flowing water, so that test failure is caused.
It is therefore desirable to develop a method of installing a sensor on a heat transfer tube with a waterproof seal that addresses the above problems.
Disclosure of Invention
The invention aims to solve the problems and designs a method for installing a sensor on a heat transfer pipe in a waterproof washing seal mode.
The invention realizes the purpose through the following technical scheme:
a method for installing a sensor on a heat transfer pipe (the heat transfer pipe is a hollow pipe with a certain wall thickness) in a waterproof and washing-out-proof sealing manner comprises the following steps:
waterproof washing sealing protection of the acceleration sensor fixing screw in the heat transfer pipe; which comprises the following steps:
a1, a special installation tool sends the sensor into the heat transfer pipe;
a2, a magnet adsorption sensor, and the installation direction of the positioning sensor in the heat transfer pipe;
a3, coating thread glue on the thread of the fastening screw, and fixing the sensor in the heat transfer pipe by adopting a special fastening screw;
a4, coating waterproof glue on the surface of a fixing hole of the sensor;
a5, covering the fixing hole with a circular film-shaped soft ultrathin stainless steel paper foil;
a6, welding the edge of the stainless steel foil;
a7, coating waterproof glue on welding spots and edge gaps;
a8, completing the waterproof washing sealing protection of the fixing screw of the acceleration sensor in the pipe;
the surface of the heat transfer pipe is pasted with a strain gauge for waterproof washing sealing protection; which comprises the following steps:
b1, adhering a waterproof strain gauge at the strain test point on the outer wall of the heat transfer pipe;
b2, coating the surface of the strain gauge with waterproof glue for 2-3 times;
b3, sheathing a waterproof heat-shrinkable sleeve and thermally shrinking;
b4, binding ports at two ends of the heat-shrinkable sleeve by using a PE wire and bonding wire ends of a wire tail by using glue;
b5, coating glue and sealing the gaps of the two ports of the heat-shrinkable sleeve;
b6, finishing the waterproof washing sealing protection process of sticking a strain gauge on the surface of one pipe;
lead wires of the strain gauge on the surface of the heat transfer pipe are protected against water erosion; which comprises the following steps:
c1, positioning the lead of the strain gauge along the tube wall according to a certain distance;
c2, covering the lead wire with a soft stainless steel paper foil with proper external dimensions;
c3, welding the soft stainless steel paper foil on the surface of the heat transfer pipe;
c4, coating the welding spot and the edge of the welding seam with waterproof glue;
c5, finishing the waterproof washing sealing protection process of pasting a strain gauge on the surface of one pipe;
the sensor lead wire is protected in a waterproof and washing-proof manner on the surfaces of various metal bodies; which comprises the following steps:
d1, grouping the sensor leads according to the fixed leading-out positions, sheathing the sensor leads by a waterproof heat-shrinkable sleeve and thermally shrinking the sensor leads;
d2, covering the lead with ultrathin stainless steel paper foil with proper shape along the lead-out path and attaching the foil to the surface of the metal body fixed with the lead;
d3, welding the edge of the stainless steel paper foil on the surface of the metal body;
d4, coating the welding spot and the gap between the stainless steel paper foil and the metal surface with waterproof glue;
d5, finishing the waterproof washing sealing protection process of the sensor lead on the surface of the metal body with various shapes.
Preferably, in step a3, the fastening surface of the special fastening screw is a conical surface, the contact surface of the threaded hole on the heat transfer tube wall is a conical surface, and after the special fastening screw is screwed into the threaded hole on the heat transfer tube wall, the conical surface of the special fastening screw is tightly attached to the conical surface of the threaded hole on the heat transfer tube wall.
Preferably, in step A4, 1-3 layers of waterproof glue are coated on the surface of the fixing hole of the sensor.
Preferably, in step B2, each glue application is performed after the last glue application is completely dried.
Preferably, in step C1, the positioning is a dispensing positioning.
Preferably, in the steps A6, C3 and D3, the welding adopts a resistance welding process.
Preferably, in the steps A8 and B6, the total thickness of the finished protective layer does not exceed 0.3 mm.
The invention has the beneficial effects that:
(1) the sensor is installed in the heat transfer pipe and accurately fixed, and the installed sensor can resist long-term high-speed running water washing without loosening and losing efficacy; the influence of the installation of the sensors in the narrow and densely arranged tube bundles on the narrow space flow field is solved; the special thread glue and the special waterproof glue are overlapped and sealed, and the surface of the stainless steel paper foil is welded and sealed, so that the influence of vibration interference and the like caused by the fact that flowing water at the position of a screw fixing hole permeates into a pipe is avoided;
(2) the surface of the heat transfer pipe is pasted with the strain gauge for waterproof scouring sealing protection, and the process method of coating the surface of the strain gauge with waterproof glue in multiple layers, tightening the surface of the strain gauge by the waterproof heat shrink tube, preventing loosening binding of PE wires and gluing a connector lug is adopted, so that the problem of high-speed transverse flowing water scouring prevention protection of pasting the strain gauge on the surface of the heat transfer pipe in a narrow and densely-arranged pipe bundle is solved; the compact protective layer structure reduces the influence on a narrow space flow field and also avoids the risks of rapid aging and crushing, water flow scouring and cracking failure and the like caused by the adoption of a traditional rubber sleeve in deionized water;
(3) the lead of the heat transfer pipe surface strain gauge is protected by waterproof washing and sealing, the fixed wiring of the lead of the sensor on the surface of the pipe is solved, the failure caused by the fact that the lead is broken by washing of transverse high-speed running water is solved, and the test error caused by the fact that the lead swings randomly along with the running water is solved;
(4) the waterproof scouring sealing protection of the sensor lead on the surface of the metal body with various shapes solves the problem that the lead is easy to break and lose efficacy due to the waterproof of the sensor lead in a water body and the long-term scouring of high-speed running water, and also solves the problem of test error interference caused by the random swing of the sensor lead due to the scouring of the running water.
Drawings
FIG. 1 is a flow chart of a process for protecting a sensor fixing screw in a heat transfer tube from water erosion;
FIG. 2 is a flow chart of the process for protecting the surface of a heat transfer tube against water erosion by adhering a strain gauge
FIG. 3 is a flow chart of a process for protecting the lead wires of the strain gage on the surface of the heat transfer tube from water erosion;
FIG. 4 is a flow chart of a process for protecting sensor leads against water erosion on the surface of metal bodies of various shapes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
A method of installing a sensor on a heat transfer tube with a waterproof seal, comprising:
waterproof washing sealing protection of the acceleration sensor fixing screw in the heat transfer pipe; as shown in fig. 1, it includes the steps of:
a1, a special installation tool sends the sensor into the heat transfer pipe;
a2, adsorbing the sensor on the outer wall of the heat transfer pipe by using a magnet, adsorbing the sensor by the magnet through the heat transfer pipe, moving the sensor by moving the magnet, and finally positioning the installation direction of the sensor in the heat transfer pipe;
a3, coating thread glue on the thread of the fastening screw, and slowly screwing the fastening screw into the fixing hole of the sensor in the heat transfer pipe by adopting a screwdriver;
a4, after the thread glue is solidified, coating 1-3 layers of waterproof glue on the surface of a fixing hole of the sensor;
a5, after the waterproof glue is solidified, covering the fixing hole with a circular film-shaped soft ultrathin stainless steel paper foil, so that the stainless steel paper foil is tightly attached to the outer wall of the heat transfer pipe;
a6, welding the edge of the stainless steel foil by adopting a resistance welding process;
a7, coating waterproof glue on the welding spots and the gaps between the edges of the stainless steel foil and the pipe wall by using the waterproof glue, and curing the glue, wherein the height of the protective layer after the whole protection process is finished is less than 0.3 mm;
a8, completing the waterproof washing sealing protection of the fixing screw of the acceleration sensor in the pipe;
compared with the traditional sensor tube hole sealing method which only adopts the screw head coating glue for fixation, the sensor tube hole sealing method is characterized in that a firm sealing surface is formed by overlapping a mechanical surface with thread glue, a special waterproof glue is coated at the gap between the top surface of the screw head and the tube wall, and then a soft stainless steel paper foil is overlapped for sealing and welding, and a waterproof sealing surface which is integrated with the surface of the tube wall is almost formed, so that the damage of water resistance, scouring and random vibration is enhanced, the occupied space for installing and fixing the sensor is saved, and the narrow flow field space among dense tube bundles is restored, so that the test state is more real;
the surface of the heat transfer pipe is pasted with a strain gauge for waterproof washing sealing protection; as shown in fig. 2, which includes the steps of:
b1, adhering a waterproof strain gauge at the strain test point on the outer wall of the heat transfer pipe;
b2, coating the surface of the strain gauge with waterproof glue for 2-3 times, wherein each time of glue coating needs to be carried out after the last glue coating is completely dried;
b3, sheathing a waterproof heat-shrinkable sleeve and thermally shrinking;
b4, binding the ports at the two ends of the heat-shrinkable sleeve by using an anti-slip PE wire in an anti-loosening binding mode, and bonding the wire ends of the wire tail by using an adhesive;
b5, coating glue and sealing the gaps of the two ports of the heat-shrinkable sleeve;
b6, finishing waterproof washing sealing protection of pasting a strain gauge on the surface of a pipe, wherein the total thickness of the protective layer is not more than 0.3 mm;
compared with the traditional rubber sleeve isolation protection method, the waterproof heat-shrinkable sleeve contracts the surface of the sleeve, and is more reliable and durable; secondly, the surface of the strain gauge can be better sealed and scoured by water flow; the combined process of binding the PE wire and sealing the waterproof glue at the two ends ensures that the strain gauge is more firm and reliable in waterproof scour prevention;
lead wires of the strain gauge on the surface of the heat transfer pipe are protected against water erosion; as shown in fig. 3, which includes the steps of:
c1, smoothing the lead of the strain gauge and dispensing and positioning the lead of the strain gauge along the tube wall at a certain distance; so that the pipe is relatively attached and fixed on the curved surface of the pipe wall;
c2, covering the lead with soft ultrathin stainless steel paper foil with proper external dimensions;
c3, welding the soft stainless steel paper foil on the surface of the heat transfer pipe by using a resistance welding process;
c4, coating the welding spot and the edge of the welding seam with waterproof glue;
c5, finishing the waterproof washing sealing protection of one pipe surface with a strain gauge;
compared with the traditional fixed protection method that the lead on the surface of the pipe is bundled by the enameled wire and is overlapped with glue, the combined process that the soft ultrathin stainless steel paper foil is welded on the surface of the pipe and is overlapped with the waterproof glue sealing welding spot and the edge welding seam is adopted, so that the lead fracture failure caused by the scouring damage of transverse high-speed flowing water is effectively prevented;
the sensor lead wire is protected in a waterproof and washing-proof manner on the surfaces of various metal bodies; as shown in fig. 4, it includes the steps of:
d1, grouping the sensor leads according to the fixed leading-out positions, sheathing the sensor leads by a waterproof heat-shrinkable sleeve and thermally shrinking the sensor leads;
d2, covering the lead-out path with an ultrathin stainless steel paper foil with a proper shape and attaching the foil to the surface of the metal body fixed with the supporting lead;
d3, welding the edge of the stainless steel paper foil on the surface of the metal body by resistance welding;
d4, coating the welding spot and the gap between the stainless steel paper foil and the metal surface with waterproof glue;
d5, finishing the waterproof washing sealing protection of the sensor lead on the surface of the metal body with various shapes.
Compared with the traditional wiring method, the process adopts the ultra-thin stainless steel paper foil to seal and weld and cover the inner wall of the water through body, thereby effectively avoiding the scouring damage of high-speed flowing water in the water through body to the sensor lead in the body and the test error caused by the random swing of the lead.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (7)
1. A method of installing a sensor on a heat transfer tube in a waterproof seal, comprising:
waterproof washing sealing protection of the acceleration sensor fixing screw in the heat transfer pipe; which comprises the following steps:
a1, a special installation tool sends the sensor into the heat transfer pipe;
a2, a magnet adsorption sensor, and the installation direction of the positioning sensor in the heat transfer pipe;
a3, coating thread glue on the thread of the fastening screw, and fixing the sensor in the heat transfer pipe by adopting a special fastening screw;
a4, coating waterproof glue on the surface of a fixing hole of the sensor;
a5, covering the fixing hole with a circular film-shaped soft ultrathin stainless steel paper foil;
a6, welding the edge of the stainless steel foil;
a7, coating waterproof glue on welding spots and edge gaps;
a8, completing the waterproof washing sealing protection of the fixing screw of the acceleration sensor in the pipe;
the surface of the heat transfer pipe is pasted with a strain gauge for waterproof washing sealing protection; which comprises the following steps:
b1, adhering a waterproof strain gauge at the strain test point on the outer wall of the heat transfer pipe;
b2, coating the surface of the strain gauge with waterproof glue for 2-3 times;
b3, sheathing a waterproof heat-shrinkable sleeve and thermally shrinking;
b4, binding ports at two ends of the heat-shrinkable sleeve by using a PE wire and bonding wire ends of a wire tail by using glue;
b5, coating glue and sealing the gaps of the two ports of the heat-shrinkable sleeve;
b6, finishing the waterproof washing sealing protection of a strain gauge adhered on the surface of a pipe;
lead wires of the strain gauge on the surface of the heat transfer pipe are protected against water erosion; which comprises the following steps:
c1, positioning the lead of the strain gauge along the tube wall according to a certain distance;
c2, covering the lead wire with a soft stainless steel paper foil with proper external dimensions;
c3, welding the soft stainless steel paper foil on the surface of the heat transfer pipe;
c4, coating the welding spot and the edge of the welding seam with waterproof glue;
c5, finishing the waterproof washing sealing protection of one pipe surface with a strain gauge;
the sensor lead wire is protected in a waterproof and washing-proof manner on the surfaces of various metal bodies; which comprises the following steps:
d1, grouping the sensor leads according to the fixed leading-out positions, sheathing the sensor leads by a waterproof heat-shrinkable sleeve and thermally shrinking the sensor leads;
d2, covering the lead with ultrathin stainless steel paper foil with proper shape along the lead-out path and attaching the foil to the surface of the metal body fixed with the lead;
d3, welding the edge of the stainless steel paper foil on the surface of the metal body;
d4, coating the welding spot and the gap between the stainless steel paper foil and the metal surface with waterproof glue;
d5, finishing the waterproof washing sealing protection of the sensor lead on the surface of the metal body with various shapes.
2. The method as claimed in claim 1, wherein in step a3, the fastening surface of the special fastening screw is a conical surface, the contact surface of the threaded hole on the wall of the heat transfer tube is a conical surface, and the conical surface of the special fastening screw is tightly attached to the conical surface of the threaded hole on the wall of the heat transfer tube after the special fastening screw is screwed into the threaded hole on the wall of the heat transfer tube.
3. The method for installing a sensor on a heat transfer pipe in a waterproof seal according to claim 1, wherein in step a4, 1-3 layers of waterproof glue are coated on the surfaces of the fixing holes of the sensor.
4. The method of claim 1, wherein in step B2, each application of glue is performed after the previous application of glue has been completely dried.
5. The method for installing a sensor on a heat transfer pipe for a waterproof seal according to claim 1, wherein in step C1, the positioning is a spot-gluing positioning.
6. The method of claim 1 wherein the welding in steps a6, C3 and D3 is performed by a resistance welding process.
7. The method for installing a sensor on a heat transfer pipe with a waterproof seal according to claim 1, wherein the total thickness of the completed protective layer in steps A8 and B6 is not more than 0.3 mm.
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| CN110196145A (en) * | 2019-06-27 | 2019-09-03 | 中广核研究院有限公司 | A kind of experimental rig and its application method causing vibration principle for verifying tube bundle flow |
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