JP2005326264A - Leakage amount measuring device of gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To establish an easy evaluation method for a gasket by which use environment of the gasket is realized in a small scale, leakage test of gasket is easily performed, evaluation of gasket used in a pipe wherein high temperature corrosive chemical liquid is in a state of gas-liquid mixture, which was hard in treatment because of high melting temperature and solidification in ambient temperature and leads to hard evaluation so far without expecting an on-site test, can be more easily performed. <P>SOLUTION: The device is constituted of a part A which is closed at one end of a cylinder 2 and provided with a flange 3 at the other end, a part B provided with flanges 5, 6 at both ends of a cylinder 4, a part C which is closed at one end of a cylinder 7, provided with a flange 8 and an air intake hole 9 for leakage amount measurement in the cylinder 7, a tightening means 10 for each flange and a seal member 11. The device is constituted so as to insert a testing gasket 18 between flanges 3, 5 of the part A and the part B during leakage amount measurement, to insert a seal member 11 between the flanges 6, 8 of the part C and the part B, and to be used by tightening the facing flanges with the tightening means 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a leakage measuring apparatus for various devices in a chemical industrial plant and the like, and a gasket leakage amount measuring function for piping.

  In chemical industrial plants that use various corrosive chemicals and operate under harsh temperature and pressure conditions, `` seal leakage '' of equipment and piping can lead to serious accidents. It is necessary to carefully select the gasket that bears the sealing performance.

  In order to select a gasket according to the purpose, it is necessary to perform characteristics and evaluations according to the usage environment. At present, however, the conventional methods are generally based on the following (1) and (2) evaluation methods. Done.

(1) Basic evaluation method (evaluation method based on gasket base material, compounding ingredients, physical properties)
This evaluation method is the first selection criterion when selecting a gasket. This is a method of selecting a gasket suitable for use conditions from the base material and components of the gasket, and physical properties (physical strength, compression set, “compatibility” with the mating member, etc.).

  For example, if it is to be used for a specific corrosive chemical, it should be selected based on a base material having high chemical resistance to the chemical, and is intended for use under high temperature conditions. If it is a thing, you should select on the basis of a base material and component with high heat resistance. However, chemical resistance varies depending on temperature conditions, and heat resistance also varies depending on the chemical environment to which the gasket is exposed.

  In addition, compression set, which is one of the three physical characteristics of the gasket, is also an important item in the gasket sealability evaluation. Because many gaskets exhibit relatively flexible physical properties, long-term continuous use causes stress relaxation and causes a decrease in tightening surface pressure. Cause a leak.

  However, the initial clamping surface pressure applied to the gasket is often limited by the relationship with the entire apparatus, and the long-term sealing performance of the gasket varies depending on the initial clamping surface pressure actually applied. Furthermore, when used under high temperature conditions, the progress of deterioration of the gasket material must be taken into account.

  That is, basic data (numerical values listed in the catalog) prepared in advance is an evaluation numerical value under a certain condition, and cannot be said to guarantee performance in an actual use environment.

(2) Method of actually measuring leakage As described above, the gasket performance varies depending on the operating conditions, that is, the tightening surface pressure and temperature conditions applied during tightening of the gasket. There is a method in which the surface pressure and temperature conditions are implemented by a measuring device, and the gas fluid that actually leaks is collected under the conditions, and the leakage amount is measured and evaluated from the collected volume.

  For example, in the burette method (according to ASTM F-586), as shown in FIG. 10, a nitrogen gas source is provided in the cavity on the inner diameter side of the gasket 101 sandwiched between the flanges 106 to which a load is applied by the pressurizing means 107. 105 is loaded with a predetermined pressure of nitrogen gas, and the nitrogen gas leaked to the outer diameter side is collected by the metal sleeve 102 and the rubber O-ring 103. The collected nitrogen gas is passed through the rubber tube 110, It leads to the burette 104 filled with water, and the amount of leakage is quantified from the drop in the liquid level. Reference numeral 108 is a dial gauge for measuring the distortion of the gasket, and 109 is a pressure gauge for measuring nitrogen gas.

  The problem with this method is that it is difficult to heat the entire apparatus, so that it is difficult to perform a leak test under high temperature conditions, and the effect of gasket deterioration due to high temperature cannot be reflected in the evaluation. In addition, when evaluating a gasket used in a corrosive chemical solution environment, pretreatment such as separately dipping in the chemical solution is required in advance, and simple evaluation is difficult.

  To summarize the problems of the prior art described above, there are various environments in which gaskets are used. The sealing performance and life (durability) vary depending on the type of chemical that passes through the piping and the temperature conditions. In order to evaluate a gasket used under a corrosive chemical environment under a high temperature condition, a basic evaluation method alone is not sufficient, but there is no apparatus that employs a method for actually measuring the amount of leakage described above. For this reason, at present, the only way to perform a reliable evaluation is to make an evaluation based on the previous empirical rules and actual machine tests. However, there is a problem that it is not easy to perform an actual machine test on a sealing material used for piping and tanks incorporated as part of a large chemical plant.

  Furthermore, in order to evaluate gaskets used for piping such as high-temperature heat medium, the high-temperature heat medium exhibits high corrosivity, is a dangerous substance for human body, and many have high melting points, Since it is solid at room temperature, it is difficult to handle from the process of immersing in a chemical solution to the implementation of a leak test.

  Also, in many cases, it is necessary to consider the sealing performance assuming that the inside of the pipe is in a gas-liquid mixed state, and it is necessary to measure and comprehensively evaluate the leakage amount for both the liquid and gas states. is there.

Prior art documents related to the present invention will be exemplified.
JP 2001-66216 A JP 2000-111440 A JP-A-9-264427

  The present invention was developed in view of the above-mentioned problems of the prior art, and the object of the present invention is to realize the use environment of the gasket on a small scale, and to easily perform the leakage test, Especially, it is difficult to handle because it has a high melting point and it is solid at room temperature, and it has been difficult to evaluate until now. It is an object of the present invention to provide a gasket leakage amount measuring apparatus that can be easily performed and can establish a method for more easily evaluating gasket evaluation that has been difficult if not performed by actual machine tests.

  In order to effectively achieve the above object, the present invention is configured as follows. That is, the gasket leakage amount measuring apparatus according to the first aspect of the present invention includes a part A in which one end of a cylinder is closed and a flange is provided at the other end, a part B in which flanges are provided at both ends of the cylinder, and a cylinder One end of the body is closed and the other end is provided with a flange, and the cylinder C is provided with a gas introduction hole for measuring the amount of leakage, and the flanges of parts A and C facing the flanges on both ends of part B It consists of a fastening means for fastening, and a sealing member interposed between the flanges of parts B and C. When measuring the amount of leakage, a test gasket is interposed between the flanges of parts A and B, and both flanges are It is characterized in that it is fastened by fastening means, and a seal member is interposed between the flanges of parts C and B, and both flanges are fastened by the fastening means and used.

  Further, the gasket leakage amount measuring apparatus according to the second aspect of the present invention includes a part A in which one end of a cylinder is closed and a flange is provided at the other end, and one end of the cylinder is closed and a flange is provided at the other end. It consists of part C, which has a gas introduction hole for measuring the amount of leakage in the cylinder, and a fastening means that fastens the flange of part C opposite to the flange of part A. It is characterized in that it is used by interposing between the flanges of A and part C and fastening both flanges with fastening means.

  In the gasket leakage amount measuring apparatus according to the present invention having the above-described configuration, the gasket usage environment can be realized on a small scale, and the gasket leakage test can be easily performed. The evaluation of gaskets used for piping in a liquid mixed state can be performed more easily, and the evaluation of gaskets that has been difficult until now by actual machine tests can be more easily evaluated. it can.

  Hereinafter, a leakage amount measuring apparatus showing the best mode for carrying out the present invention shown in the drawings will be described. 1-7 is a figure regarding the leakage amount measuring apparatus of the example of a gasket concerning this invention. The illustrated leak amount measuring apparatus 1 includes a part A in which one end of a cylinder 2 is closed and a flange 3 is provided at the other end, a part B in which flanges 5 and 6 are provided at both ends of the cylinder 4, and a cylinder 7 In addition to the three main parts, which are closed at one end and provided with a flange 8 at the other end and provided with a gas introduction hole 9 for measuring the amount of leakage in the cylinder 7, flanges 5 and 6 at both ends of the part B are further provided. The fastening means 10 for fastening the flanges of the parts A and C opposed to each other and the seal member 11 interposed between the flanges of the parts B and C are provided.

  Each of the parts A, B, and C is made of a metal that can withstand high temperatures and is resistant to corrosive chemicals. Each flange 3, 5, 6, 8 has a plurality of (four in the illustrated example) through-holes 12 for inserting bolts at predetermined intervals in the circumferential direction. On the contact surface 8a side of the flange 8 of the part C facing the flange 6 of the part B, an annular recess 15 for mounting the seal member 11 is provided. Of course, the annular recess for mounting the seal member 11 may be provided in the flanges 6 and 8 of both the parts B and C. Further, it may be provided not on the flange 8 side of the part C but on the flange 6 side of the part B.

One end side of the cylindrical body 2 of the part A is closed and provided with a disk 16. Further, one end side of the cylindrical body 7 of the part C is also closed and the disk portion 17 is integrally formed. Further, the cylinder 7 of the part C is provided with the gas introduction hole 9 for introducing N ₂ gas for measuring the leakage amount into the cylinder 7.

  The fastening means 10 comprises a bolt 13 and a nut 13 in this example. When fastening the opposing flanges 3 and 5 and the flanges 6 and 8, the bolt 13 is inserted into each through-hole 12 and the nut 13. Conclude with. Of course, the fastening means 10 may be a vise that fastens both the flanges to be fastened.

  The leakage amount measuring device 1 composed of each component described above is fastened by aligning the contact surfaces of the flanges 3, 5, 6, and 8 at the ends of the parts A, B, and C with the part B as the center. The bolts 13 and nuts 14 as means 10 are fastened and assembled.

  Between the flanges 3 and 5 of the parts A and B, a test gasket 18 (for example, a gasket used under severe conditions such as a spiral gasket or a metal jacket gasket) is interposed. On the other hand, between the flanges 6 and 8 of the parts B and C, a metal hollow ○ ring (an example of the seal member 11) is interposed to ensure the sealing performance between the flanges 6 and 8. The metal hollow ring 11 (for the sake of convenience, uses the same sign as the seal member) is a gasket that exhibits higher sealing performance than the test gasket 18, so that leakage between parts BC is measured for the amount of leakage of the sample under test. It is designed not to affect the

As will be described later, since the part C in the leakage amount measuring device 1 of this example must be handled as a solid at room temperature, there is a difficulty in using the leakage amount measuring device 1 of the present invention. Specifically, it is necessary for the evaluation of gaskets against corrosive chemicals used at high temperatures. However, it is not an indispensable part when evaluating liquid chemicals at room temperature that is easy to handle. If only such a chemical solution is targeted, the part B may be a simpler apparatus having a bottomed container and an N ₂ gas introduction hole. Of course, as shown in FIG. 8 and FIG. 9, if the leakage amount measuring device 19 having the above-described configuration including the parts A and C is used, the liquid chemical solution is evaluated at room temperature which is easy to handle as described above. Can be used as a device. The configuration of the leakage amount measuring device 19 is a configuration in which the part B is excluded from the configuration of the leakage amount measuring device 1 of the above-described example. Omitted.

Next, a gasket evaluation method using the leakage amount measuring apparatus 1 according to the present invention will be described.
(1) Necessity of measurement of gas leakage and liquid leakage If the fluid to be used in the actual machine is a liquid, it may be sufficient to conduct a leakage test with the liquid. However, liquid leakage is very difficult to quantify. For example, it is effective in the case of an inspection for confirming the presence or absence of leakage, but it is often difficult to make a relative comparison of gaskets by the amount of leakage.

  On the other hand, gas leakage is easy to quantify, and it is easy to make a relative comparison of gaskets based on the amount of leakage. However, for gas and liquid, due to the viscosity and molecular weight, for example, the amount of gas leakage is the amount of liquid leakage under the same pressure conditions. May exceed 1000 times. Therefore, especially when evaluating the gaskets used in high-temperature heat medium lines, which require sealability in a gas-liquid mixed state, leakage tests for both gas and liquid are performed, and relative gaskets according to the amount of gas leakage are measured. It is possible to perform more reliable evaluation by performing the pass / fail determination by confirming the comparison and the presence or absence of liquid leakage.

  According to the leakage amount measuring apparatus 1 of the present invention, as will be described in detail below, actual gasket tightening conditions and other use conditions are realized on a small scale, and gas leakage and liquid leakage are measured under those conditions. Is possible. Furthermore, even if it is the measurement with respect to a solid corrosive chemical | medical solution at normal temperature, the sealability of the gasket with respect to it can be evaluated easily with good handleability.

Below, the implementation procedure of the leak test of the gas leak test liquid of the gasket used under the heat medium for high temperature using the leak amount measuring apparatus 1 of this invention is demonstrated.
According to this leakage amount measuring device 1 (test device), even a corrosive chemical solution that is difficult to handle in a solid state (crystalline state) at room temperature, such as a high-temperature heat medium, is easy to handle and has a real environment. It can be understood that it is possible to obtain the results of both the gas and liquid under conditions close to, and to evaluate a highly reliable gasket based on these results.

(2) Gas leakage measuring method (a) A test sample 18 (hereinafter referred to as “gasket”) to be measured is mounted between the flanges 3 and 5 of the parts A and B, and the bolt 13 and the nut 14 are used to A tightening surface pressure is applied to form a part AB assembly.
(B) In order to realize a corrosive environment in which the gasket 18 is actually used inside the leak amount measuring apparatus 1, a corrosive chemical solution (the high temperature heat medium “HTS” is solid at room temperature) is applied to the part C. Fill and mount the hollow metal O-ring 11 in the gasket mounting groove (annular recess 15) provided in the flange 6 of the part C.
(C) The flange 6 on the part B side of the part A-B assembly and the flange 8 on the part C are fastened with bolts 13 and nuts 14 with a predetermined tightening surface pressure to complete the leakage amount measuring apparatus 1 (FIG. 3). .
(D) Next, as shown in FIG. 4, the leakage amount measuring apparatus 1 is inverted and placed so that the part C is positioned on the upper side. At this time, since the volume of the part C is larger than the volume of the part A, the corrosive chemical solution can be brought into contact with the gasket 18 after the reversal if the volume of the part C is filled with a sufficient amount of the chemical before the reversal. The gasket 18 is exposed to the same corrosive environment as that in which it is used.
(E) Deterioration treatment: The leakage amount measuring device 1 is heated for a predetermined time in an electric furnace or the like in order to realize the same high temperature conditions as the use conditions (FIG. 4). At this time, the solid high-temperature heat medium is heated to a temperature equal to or higher than the melting point, becomes liquid, and realizes the same environment as the usage environment of the gasket 18. Further, in order to further promote the deterioration, the inside of the leakage amount measuring apparatus 1 (inside each of the cylinders 2, 4, and 7) is pressurized with N ₂ gas.
(F) After heating for a predetermined time, the temperature is lowered to a predetermined temperature (a temperature just before solidification), and the leakage amount measuring device 1 is inverted again as shown in FIG. 5 and cooled to room temperature in the furnace.
(G) Remove part C and collect corrosive chemical. (Since the leak amount measuring device 1 is inverted, the chemicals gather in the part C and are collected in the part C in a solid state.)
(H) The part C with the hollow metal O-ring 11 attached to the parts A-B assembly is fastened with bolts 13 and nuts 14 at a predetermined surface pressure, and the leakage amount measuring apparatus 1 is assembled.
(I) As shown in FIG. 6, connects the N ₂ gas cylinder via a pressure reducing valve or the like in an N ₂ gas introduction hole provided in the parts C of the leak rate measuring device 1, it is immersed in water (submergence Act).
(J) Opening the pressure reducing valve, introducing N ₂ gas into the leakage measuring device 1 at a predetermined pressure, and measuring the gas leaking from between the flanges 3 and 5 of the parts A and B which are the mounting portions of the gasket 18 The amount of gas leakage is obtained from the volume of the gas collected by the method.
(K) After reducing the pressure to atmospheric pressure, remove part C.
In the case of a liquid chemical at room temperature, the above-described leakage amount measuring device 19 or a simple leakage amount measuring device (FIGS. 8 and 9) composed of part A and bottomed part B may be used.

(3) The liquid leak amount measuring methods (a) to (g) are performed in the same manner as the above-described leak amount measuring method using gas (1). Further, it is possible to carry out comprehensive evaluation by measuring the liquid leakage amount following the gas leakage amount measuring method.
(H) The measurement fluid is filled from the opening of the part B of the part A-B assembly. The liquid level is set to be equal to or higher than the joining surfaces of the parts A and B so that the gasket 18 comes into contact with the measurement fluid. (Fig. 7)
(I) The part C on which the hollow metal ◯ ring 11 is mounted is again fastened to the part A-B assembly with bolts 13 and nuts 14 at a predetermined surface pressure, and the leakage amount measuring apparatus 1 is assembled.
(J) As shown in FIG. 7, an N ₂ cylinder is connected to the N ₂ gas introduction hole 9 provided in the part C of the leakage amount measuring apparatus 1 via a pressure reducing valve or the like, the pressure reducing valve is opened, and a predetermined pressure is applied. N ₂ gas is introduced into the leakage amount measuring apparatus 1 so that a predetermined internal pressure is applied to the gasket 18.
(K) Check for liquid leakage from the parts A and B which are gasket mounting parts. If leakage is found, collect the leaked liquid and determine the amount of liquid leakage based on its volume.

(4) Reference (control test) In the evaluation method based on the above leakage amount measurement, a leak test when the gasket deterioration treatment is not performed should be performed as a control test. Thereby, the leakage amount of the gasket in the standard condition (initial condition) can be known. On the other hand, it is because the evaluation in use conditions can be performed more appropriately by comparing how much the leakage amount has increased after the deterioration process.

Experimental Example An experimental example of the present invention will be described below. As a heat medium for high temperature, HTS which is a typical molten salt heat medium (for example, NeoSK-SALT (KNO ₃ , NaNO ₃ , NaNO ₃ mixture, melting point 142 ° C., manufacturer: Soken Technics Co., Ltd.)) NeoSK-SALT was evaluated using the leakage amount measuring apparatus 1 of the present invention to determine whether or not a spiral gasket can be adopted as a sealant for a piping line using a product name).

(1) Test gasket spiral wound gasket 1
Product name Barcatite NO. 596
Filler: Special asbestos paper Hoop: SUS304
Inner and outer rings: SUS304
Spiral gasket 2
Product name Clean Tight, manufactured by Nippon Valqua Industries, Ltd.

(2) Test conditions HTS, which is a high-temperature heat medium, is extremely corrosive, and the use temperature as the heat medium is a line that reaches a high temperature of 420 ° C. The following conditions were set as test conditions.
* Test size: JIS 10K 25A
(Flange and gasket dimensions corresponding to JIS 10K25A schedule pipe)
* Degradation conditions Corrosive fluid: HTS
Temperature condition: 420 ° C
Pressure: 0.1 MPa N ₂ gas Time: 1 week

* Leakage measurement Because the measurement environment of the gasket is considered to be a gas-liquid mixed state, both the gas leakage measurement and the liquid leakage measurement are performed. The ability to withstand use was evaluated.

Measurement of gas leakage Gas: N ₂ gas Pressure condition: 1.0 MPa under pressure

Measurement of leakage of liquid Liquid: Water (Testing with HTS is dangerous, so water was substituted.)
Pressure condition * Gasket tightening surface pressure: Initial tightening surface pressure (* Note) 68.6Pa (initial conformity to the seal surface) Deteriorating treatment and tightening surface pressure during leakage measurement
(*note)
“Initial tightening surface pressure” eliminates the gap between the gasket and the flange (provides so-called “familiarity”), prevents contact surface leakage, and sufficiently compresses the gasket to exhibit its original sealing function. It is set as the tightening force required for Since stress relaxation occurs due to continuous use, the gasket is usually set higher than the surface pressure required for the sealing function.

* Leakage measuring device 1 (test device)
In order to provide a device having the heat resistance necessary for this evaluation and the corrosion resistance to the chemical solution, each part A, B, C of the leak amount measuring device 1 is resistant to the test conditions and is inexpensive STPG material, hollow metal 0 For the ring, SUS321 material (manufactured by Nippon Valqua Industries, Ltd., dimensions: outer diameter 50 mm × tube diameter 1.6 mm) was used.

(3) Test method
(3) -1 Initial leakage measurement (control test)
(A) Install the test gasket between the flanges of parts A and B of the leak amount measuring device 1, and apply an initial tightening surface pressure of 68.6MPa to the test gasket with a torque wrench to make it compatible with the seal surface. Gave. Next, the tightening force was loosened to 41.2 MPa, assuming application relaxation due to continued use of the test gasket. In other words, the evaluation was made based on the amount of leakage in a state in which the tightening surface pressure was 41.2 MPa due to stress relaxation after the initial tightening force was applied and continued for a certain period.
(B) Next, the hollow metal ○ ring 11 is interposed and the part C is tightened at 18 kN, the leakage measuring device 1 is assembled, and the leakage measuring device is directly used as shown in FIG. Under the pressure of N ₂ gas of 1.0 MPa, the presence or absence of leakage was confirmed between the parts A and B, which are the gasket mounting parts, but no leakage was observed in the test gaskets 1 and 2.
Continued (c), remove the parts C, filled with water to parts A-B assembly, gasket in the apparatus in 1.0MPaN ₂ gas pressure at the leakage-quantity measuring device 1 shown in Figure 7 is brought into contact with water It was introduced and the presence or absence of leakage from the parts A and B, which are the gasket mounting parts, was confirmed. However, no leakage was observed in the test gaskets 1 and 2.

(3) -2 Leakage measurement after deterioration (a) Install a test gasket between parts A and B flanges of the leak measurement device 1, and apply an initial tightening surface pressure of 68.6MPa to the gasket with a torque wrench. Conformity was given to the sealing surface. Next, the tightening force was loosened to 41.2 MPa assuming stress relaxation due to continued use of the gasket.
(B) Next, the hollow metal O-ring 11 is interposed and the part C is tightened to 18 kN, the measuring device is assembled (FIG. 4), and the part C is filled with the HTS liquid according to the procedure (2) of the test method. Then, the deterioration treatment was carried out by leaving it in an electric furnace at a temperature of 420 ° C. under a pressure of 0.1 MPa of N ₂ gas for 1 week.
The recovery of HTS is performed by depressurizing the N ₂ gas to atmospheric pressure and lowering the furnace temperature to 250 ° C., and then reversing the leakage amount measuring apparatus 1 so that the part A is on the upper side to reach the normal temperature. And then recovered from part C.
(C) The leak amount measuring apparatus 1 was washed with water, completely removed from the HTS, and then dried.
(D) The spare part C was fastened to the A-B assembly via the metal hollow O-ring 11 and the leak amount measuring device was assembled again.
(E) According to the procedure (2) of the test method, the amount of gas leakage was measured in the apparatus 1 by a submerging method under a pressure of N ₂ gas of 1.0 MPa (FIG. 6).
Leakage rate (ml / min) = collection volume ÷ collection time As a result, the gas leak rate of the test gasket 1 was 43 ml / min, and the test gasket 2 was 213 ml / min.
Continued (k), remove the parts C, filled with water to parts A-B assembly, gasket in the apparatus in 1.0MPaN ₂ gas pressure at the leakage-quantity measuring device 1 shown in Figure 7 is brought into contact with water It was introduced and the presence or absence of leakage from the parts A and B which are gasket mounting portions was confirmed. No leakage from the test gasket 1 was observed. However, a slight leak was observed from the test gasket 2 in appearance.
(L) As a result of the above, no leakage was observed from the measurement of the liquid (water) leakage due to the deterioration treatment, but from the measurement of the gas leakage, the test was performed more than the test gasket 1 due to the deterioration treatment. It became clear that the gasket 2 was greatly affected, and the gasket 1 used for the HTS line was found to be more desirable.
This result was consistent with the result of the actual machine test.

FIG. 3 is a perspective view of an example of a gasket leakage amount measuring apparatus (the N ₂ gas introduction hole is omitted) according to the present invention. It is explanatory drawing which shows schematic structure of the leak amount measuring apparatus shown in FIG. It is explanatory drawing which shows the leak amount measurement process in the gas leak amount measuring method using the leak amount measuring apparatus shown in FIG. It is explanatory drawing which shows the leak amount measurement process in the gas leak amount measuring method using the leak amount measuring apparatus shown in FIG. It is explanatory drawing which shows the leak amount measurement process in the gas leak amount measuring method using the leak amount measuring apparatus shown in FIG. It is explanatory drawing which shows the leak amount measurement process in the gas leak amount measuring method using the leak amount measuring apparatus shown in FIG. It is explanatory drawing which shows the leak amount measurement process in the liquid leak amount measuring method using the leak amount measuring apparatus shown in FIG. It is a perspective view of the leakage amount measuring apparatus (the N ₂ gas introduction hole is omitted) of another example of the gasket according to the present invention. It is explanatory drawing at the time of use of the leak amount measuring apparatus shown in FIG. It is explanatory drawing which shows the leakage amount measuring apparatus of the example of the conventional gasket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 19 Leak amount measuring apparatus A Parts B Parts C Parts 2 Cylinder 3 Flange 4 Cylinder 5 Flange 6 Flange 7 Cylinder 8 Flange 9 Gas introduction hole 10 Fastening means 11 Seal member 18 (Test) Gasket

Claims (2)

  Part A with one end of the cylinder closed and flanges at the other end, Part B with flanges at both ends of the cylinder, one end of the cylinder closed with a flange at the other end, and leakage into the cylinder A part C provided with a gas introduction hole for measurement, a fastening means for fastening the flanges of parts A and C opposed to the flanges at both ends of part B, and a flange between parts B and C are interposed. It consists of a seal member, and when measuring the amount of leakage, a test gasket is interposed between the flanges of parts A and B, and both flanges are fastened by fastening means, and the seal member is flanged of parts C and B An apparatus for measuring a leakage amount of a gasket, characterized in that it is used with both flanges fastened by fastening means with a flange interposed therebetween.   A part A in which one end of the cylinder is closed and a flange is provided at the other end; a part C in which one end of the cylinder is closed and a flange is provided at the other end; and a gas introduction hole for measuring a leakage amount is provided in the cylinder; It consists of a fastening means that fastens the flange of part C opposite to the flange of part A. When measuring the amount of leakage, a test gasket is interposed between the flanges of parts A and C, and both flanges are fastened by fastening means. A gasket leakage amount measuring device characterized in that it is fastened and used.

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