JPS60231131A - Method and apparatus for testing joint of piping - Google Patents

Abstract

PURPOSE:To test the strength characteristics and tightness of a pipe and a pipe joint in a state approximate to a use state, by connecting the pipe and the pipe joint to the joint part received in a hermetically closed chamber and imparting mechanical load and fluid load to both of them. CONSTITUTION:A hermetically closed joint testing apparatus 2 is placed on a fixed stand 1 and the connection part 4a of an object 4 to be tested such as a pipe and a pipe joint is connected to the joint part 3 in the chamber 2. A valve 25 is opened to send a fluid having desired pressure into the film body 12 of a pressure tank 11 from a route 15 and valves 24, 23 are opened to pressurize the tst fluid in the pressure tank 11 while the pressurized test fluid is sent to a heating tank 6 to be heated to desired temp. by a heating means 7. When a valve 22 is opened, the test fluid is introduced into the object 4 to be tested from the joint part 3 to impart fluid load thereto and, at the same time, mechanical load is applied thereto compositely by a vibrator 29. By this method, the test of strength characteristics and tightness can be performed to the object 4 to be tested under a condition almost the same to that at the time of use.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention aims to improve the strength characteristics and tightness of pipes and pipe joints used in chemical plants, atomic couplants, etc. by combining mechanical loads and fluid loads. [Prior art] Pipes and pipe fittings are used in large numbers as elemental parts in plants, but their performance varies depending on the environment in which they are used. required. For this reason, performance tests are conducted prior to use.

Performance tests include mechanical loads such as bending, tension9, torsion, and vibration, and fluid loads such as pressure resistance, heat resistance, corrosion, and leakage. In the prior art, each of the above performance tests is performed selectively, and there is no equipment to easily perform the test, so in most cases the evaluation is performed by a one-time test.

[Problem that the invention seeks to solve]

Pipes and pipe fittings used in plants are often subjected to a combination of mechanical and fluid loads, and highly reliable evaluations cannot be made through alternative tests. Furthermore,
If damage occurs to pipes or pipe fittings during plant operation, maintenance will be extremely difficult and the plant operation rate will drop significantly. Therefore, the present invention enables various tests to be easily performed, mechanical loads and fluid loads are applied selectively or in combination, improves test reliability, and prevents damage to pipes and pipe joints. The purpose of this invention is to provide a testing method for pipe joints that can improve the operating rate of plants, etc., and a testing device that can be used directly to implement the method.

[Means for solving problems]

In order to achieve the above object, the present invention connects a joint between a pipe and a pipe joint to a joint stored in a sealed chamber, introduces a test fluid into the joint, and detects the amount of leakage from the joint. At the same time, the pipes and pipe fittings are selectively or combinedly subjected to mechanical loads such as bending, tensioning, torsion, and vibration, and fluid loads having a desired temperature, pressure, or pressure cycle. It is characterized by a test method, and is formed to house a joint where a joint between a pipe and a pipe joint is connected, into which a test fluid is introduced, and to detect the amount of leakage of the test fluid from the joint. A joint test chamber in the form of a closed chamber, a heating tank communicating with the joint and adjustingably heating the test fluid by heating means, and a pressurized fluid connected to the heating tank and introduced into an isolated membrane body. a pressurizing tank for pressurizing the test fluid through the pressurizing tank; a pressure applying means for applying a desired pressure or pressure cycle to the pressure fluid introduced into the membrane body of the pressurizing tank; A mechanical load means is installed and detachably engaged with the pipe or pipe joint to apply a mechanical load such as bending, tension, twisting, or vibration to the skeleton or pipe joint, and a mechanical load means is introduced into the joint part. Selectively adjust the temperature, pressure, and pressure cycle of the test fluid above.
The test device is a test device for pipes and pipe fittings, which is composed of an adjustment means for making complex adjustments.

[Effect]

After the pipes and pipe fittings are connected to the joints in the joint testing chamber, the test fluid, which is maintained at a constant pressure or a desired pressure cycle by a pressurized tank and heated to the desired temperature by a heating tank, is introduced into the pipes and pipe fittings. Ru. At the same time, a strength test is performed by applying a load using mechanical load means such as bending or tension that engages the pipe or pipe joint. The above-mentioned load may be selected from either a fluid load or a mechanical load, or may be a combination of both. In addition, we conducted tests based on various conditions corresponding to fluid demands to determine their strength characteristics, and measured the amount of leakage from the joints by accumulating them in a joint testing chamber. It becomes possible to test the performance.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, a joint test chamber 2 in the form of a closed chamber is placed on a fixed table 1, and a joint portion 5 is housed within the joint test chamber 2. As shown in FIG. The test object 4, such as a pipe or a pipe joint, is mounted and positioned by connecting the joint part 4a to the joint part 3. A pipe 5 is connected to the joint part 3.

The test fluid leaked from the joint 4a is contained in the joint test chamber 2, and the amount of leakage is measured by a flow rate measuring means (not shown) connected to the joint test chamber 2.

Piping 5 is connected to heating tank 6 . A heating means 7 is engaged with the heating tank B and adjustably heats the test fluid supplied by the pump 9 from the tank 8. A pressurized tank 11 is connected to the heating tank 6 via piping 10 . A test fluid is also introduced into the pressurized tank 11, and this test fluid is pressurized in a freely adjustable manner by the pressure fluid supplied into the membrane body 12 provided in the pressurized tank 11.

The pressure loading means is a pressure adjustment mechanism 14 from the tank 13 in the membrane body 12? : Yarn path 1 through which pressure fluid of desired pressure is supplied
5, a line 18 for supplying a pressure fluid having a desired pressure cycle from a tank 17 into the membrane body 12 via an electrically operated valve 16 for generating a desired pressure fluctuation cycle, and a safety valve 19, and a tank 20. Thread path 2 for returning pressure fluid into
Formed from 1.

The adjusting means is supplied in the form of an on-off valve 22 in the pipe 5, on-off valves 23 and 24 in the pipe 10, and on-off valves in the yarn paths 15 and 18.

Note that the test fluid introduced into the test object 4 is
It is discharged from a pipe 27 connected to the end of the pipe 27 in a completely leak-proof manner.

The mechanical loading means is then removably mounted on the fixed frame 28 and engages the end of the test object 4 .

What is shown in FIG. 1 is a vibrator 29 that applies a vibration load to the test object 4. The vibrator 29 includes a base 30 seated on a fixed frame 28, an excitation source 31 placed on the base 30, a stopper 32 attached to the test object 4, and a stopper 32 that is applied to the stopper 32. It is composed of a spring ball 63 etc. that provides vibration force.

The test object 4 is vibrated by a vibrator 29 .

Figures 2 to 4 show other mechanical loading means, with Figure 2 being a bending loader 34 and Figure 3 being a tensile loader 35.
, FIG. 4 respectively show the torsional loader 36.

The bending loader 54 presses the end of the test object 4 with a cylinder 37 to bend it. The tensile loader 65 is
A tensioner 68 is connected to the end of the test object 4, and the guide shaft 3
This is to raise it along the lines of 9. The torsion loader 36 is configured to fit a ring member 40 onto the test object 4 and apply a tangential force to the outer circumferential side of the ring member 40 using cylinders 41 and 42 to apply torsional force.

Various loads can be easily applied by mounting each of the above-mentioned load devices on the fixed frame 28 as necessary and engaging the test object 4.

Next, the operation of this embodiment will be explained.

First, a case will be described in which a mechanical load and a fluid load are combined, and a test fluid at a desired temperature and pressure is applied as the fluid load.

The on-off valve 25 of the regulating means is opened, and pressurized fluid at a desired pressure is sent from the thread path 15 into the membrane body 12 of the pressurized tank 11 . On the other hand, when the on-off valves 24 and 23 are opened and the test fluid is introduced into the pressurized tank 11 side and into the heating tank 6, the test fluid in the pressurized tank 11 is brought to a desired pressure by the pressure fluid in the membrane body 12. It is pressurized and sent into the heating tank 6. Next, the test fluid pressurized to a desired pressure is heated to a desired temperature by the heating means 7 of the heating tank 6. When the on-off valve 22 is opened, a test fluid at a predetermined temperature and pressure is introduced into the test object 4 through the joint 6, and a fluid load is applied thereto. At the same time, as shown in FIG. 1, when the vibrator 29 is engaged with the test object 4, a complex mechanical load is applied.

As described above, the test object 4 is tested under almost the same conditions as when used, and a highly reliable test is performed.

When cyclic fluctuations are required as pressure conditions, the on-off valve 26 is opened and the pressure fluid of the desired pressure cycle is introduced into the membrane body 12 by the electrically operated valve 16.
Therefore, it is done. In addition, if it is necessary to apply another mechanical load, it may be replaced with a desired load device as described above. This replacement can be done as a set and is relatively easy.

Next, when selectively applying a mechanical load or a fluid load, only the mechanical load is applied by closing the on-off valve 22. In the opposite case, the on-off valve 22 may be opened and the load device may be removed.

Furthermore, if it is desired to supply only the heated test fluid at normal pressure, the on-off valve 24 may be opened, and if only the pressurized test fluid at room temperature is desired to be supplied, the heating means 7 may be closed.

As described above, loads of various conditions are applied selectively and in combination.

Furthermore, as mentioned above, if the test fluid leaks from the joint 4a of the test object 4 during the test, it will be sealed and stored in the joint tester 2, and the amount of leakage will be quantitatively measured. The tightness of the specimen is tested.

〔Effect of the invention〕

As is clear from the above description, the present invention provides the following effects.

(1) Mechanical loads and fluid loads are applied selectively and in combination to conduct tests that approximate the conditions of use, improving the reliability of the tests.

(2) Since it is easy to switch and adjust load conditions, test time is shortened and sufficient tests can be performed.

(3) After sufficient testing, the test object is used in a plant, etc., which prevents problems such as damage after use and improves plant operation rate. (4) Leakage amount is reduced. Quantitative measurements ensure safety, and tests are conducted safely without leaking oil to the outside.

(5) Since the test fluid and pressure fluid are separated, the same fluid as in the actual environment, such as corrosive fluid, is used as the test fluid, and the test takes corrosivity into consideration, improving the reliability of the test. .

[Brief Description of the Drawings] Figure 1 is a configuration diagram of an embodiment of the present invention, Figure 2 is a front view of a bending loader, Figure 5 is a front view of a tension loader, and Figure 4 is a front view of a torsion loader. FIG. DESCRIPTION OF SYMBOLS 1... Fixed stand, 2... Joint test chamber, 6... Joint part, 4... Test object, 4a... Joint part, 5.10.2
'7... Piping, 6... Heating tank, 7... Heating means, 8.13.17.20... Tank, 9... Pump, 11... Pressure tank, 12...・Membrane body, 14...
・Pressure adjustment mechanism, 15.18. "21.°. Thread path, 16... Electrically operated valve, 19... Safety valve, 22
゜23, 24.25.26... Opening/closing valve, 28.・Fixed frame, 29... Vibrator, 34... Bending loader, 35... Tension loader, 66... Torsional loader. Patent applicant Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] 1. In a method for testing pipe joints in which mechanical and fluid loads are applied to pipes and pipe joints to test their strength characteristics and tightness, the joints of pipes and pipe joints are placed in a sealed chamber. A test fluid is introduced into the joint to detect the amount of leakage from the joint, and the pipe and pipe joint are subjected to mechanical loads such as bending, tension, twisting, and vibration. , a fluid load having a desired temperature, pressure, or pressure cycle is applied selectively or in combination to test the strength characteristics of a pipe joint. 2. In a pipe joint testing device that applies mechanical and fluid loads to pipes and pipe joints to test their strength characteristics, the above-mentioned pipes,
A joint test chamber in the form of a closed chamber formed to house a joint to which a joint of a pipe joint is connected and into which a test fluid is introduced, and to detect the amount of leakage of the test fluid from the joint; a heating tank that is connected to the heating tank and adjustably heats the test fluid by heating means;
a pressurized tank for pressurizing said test fluid via a pressure fluid introduced into said membrane body of said pressurized tank, and a pressure that imposes a desired pressure or pressure cycle on said pressure fluid introduced into said membrane body of said pressurized tank; A machine that is removably attached to the loading means and the fixed side of the device, and that removably engages with the pipes and pipe fittings to apply mechanical loads such as bending, tension, twisting, and vibration to the skeleton and pipe fittings. 1. A testing device for a piping joint, characterized in that it is equipped with an adjustment means for selectively and compositely adjusting the temperature, pressure, and pressure cycle of the test fluid introduced into the joint.