JPS6197546A - Tester for reliability of pipe joint - Google Patents

Abstract

PURPOSE:To achive a leak test, by regulating the temperature, pressure and flow velocity of a fluid flowing through a pipe joint while a load is applied to make the state the same as that in the actual operation. CONSTITUTION:When a nitric acid based matter is used as fluid, changeover valves 62 and 65 are opened and nitric acid is fed to a tank 64 from a nitric acid feed tank 74 and circulated by a pump 63 with the regulation of the pressure thereof. The nitric acid thus circulated is heated with a heater 61 immediately before a testing section 1 and cooled with a cooler 66 after the passage through the testing section 1. There fore, the use of a high temperature nitric acid at the testing section 1 will not affect the system at all. On the other hand, when an organic solvent based matter is used, an organic solvent position value of the changeover valves 62 and 65 is opened and as in the case of the nitric acid, an organic solvent fills a tank 69 and is circulated by a pump 71 with the regulation of the pressure thereof. When an He based matter is used, an He position valve of the changeover valves 62 and 65 is opened, He is fed to a tank 68 from an He cylinder 76 and circulated by a circulating device 67 with the regulation of the pressure thereof. While a fluid is flowing, compression, stress such as tensile and vibration added to make the state the same as that in the actual operation. With such an arrangement, a leak test can be done with a high reliability.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a test device for testing the reliability of remote joints, etc., and particularly for checking the degree of sealing of pipe joints used in systems where leakage is not allowed. This invention relates to technology for a pipe joint reliability testing device suitable for performing leakage tests by applying stress and vibration to joints.

[Background of the invention]

The conventional device is a device for detecting leakage in pipe joints that are actually used, as described in Japanese Patent Application Laid-Open No. 57-8431. However, in order to confirm the reliability of the pipe fittings before they are actually used, we tested them with loads in the compression, tension, torsion, shear, and bending directions, as well as forced vibrations while fluid was flowing through the test fittings. Until now, no device has been considered for testing the presence or absence of leakage in a single tube, either alone or in combination. In addition, conventional equipment does not take into account the fact that fluid is actively flowed through the pipe joint as a mock-up, and in the pipe joint reliability test equipment, a heater is installed in front of the pipe joint under test. A cooler is installed at the rear to control the temperature of the fluid, keeping the temperature of the fluid flowing into the pipe joints high and the temperature of the fluid flowing into the test equipment outside the pipe joints low, to prevent any negative effects on the test equipment. However, no test equipment had been thought of that could perform comprehensive fluid management by adjusting not only the fluid temperature but also the pressure and flow rate.

In addition, since fluids such as nitric acid that easily corrode metal materials are used, it is also considered that maintenance intervals can be clarified by monitoring piping in systems where fluids reach high temperatures with a corrosion monitoring control system. It wasn't.

[Purpose of the invention]

Conventionally, reprocessing plants require remote maintenance using a rack system, and in that case, remote joints are required. In order to guarantee the remote joint, with fluid flowing through the test pipe joint, loads in the compression, tension, torsion, shear, and bending directions, and forced vibration were applied singly or in combination to check for leaks. It is necessary to do so. In addition, because high-temperature nitric acid must be flowed inside the remote joint and the test must be conducted under conditions similar to or higher than actual conditions, the temperature of the nitric acid flowing into the pipe joint must be adjusted just before the nitric acid flows into the remote joint. Immediately after the nitric acid flows out of the remote joint, the grade of nitric acid can be lowered to prevent the nitric acid from returning to the test equipment system at a high temperature, and the pressure of the nitric acid flowing into the remote joint can be lowered. , it is necessary to be able to adjust the flow rate.

In addition, for test equipment systems where high-temperature nitric acid must flow before and after pipe fittings, a corrosion/corrosion monitoring system that can monitor corrosion and corrosion protection should be used to clearly indicate when test equipment should be maintained. It is necessary to be able to do this.

An object of the present invention is to provide a remote joint reliability testing device that satisfies the above conditions in order to develop or guarantee a highly reliable remote joint.

[Summary of the invention]

A feature of the present invention is that in order to confirm the reliability of pipe joints used in systems where leakage is not allowed, the test pipe joints are tested in the compression direction, tensile force direction, torsion direction, shear direction, and It is possible to apply bending direction loads and forced vibrations singly or in combination to check for leaks in pipe joints. In addition, for the fluid flowing into the pipe fitting, a heater is installed just before the fluid flows into the pipe fitting to increase the temperature, and immediately after the fluid flows out from the pipe fitting, the fluid returns to the test equipment system at a high temperature. In order to prevent this, a cooler is installed to lower the temperature of the fluid, and the structure allows the pressure and flow rate of the fluid flowing inside the pipe fitting to be adjusted. Can be tested in any condition. In addition, because the test equipment system is equipped with a corrosion/corrosion monitoring system that can monitor corrosion and corrosion protection, even when fluids that easily corrode metals, such as nitric acid, are used, the maintenance period for the test equipment can be minimized. The reliability of the test equipment is also guaranteed.

[Embodiments of the invention]

Embodiments of the invention will be described below with reference to the drawings.

Referring to FIG. 1, first, a device for fixing a pipe joint and applying stress and vibration to the pipe joint will be described.

The test pipe joint 20 is assembled into the present apparatus system by being fixed by the linear mounting 7 flange 21 and the mounting flange 23. In addition, the test pipe joint 20 is subjected to vibration and various vibrations by a vibrator 31 attached to the main body frame 10, a shear stress machine 37 using a hydraulic cylinder, a screw stress machine 35, a bending stress machine 34, and a tensile compression stress machine 40. Stress can be applied. Hydraulic pressure is supplied by a hydraulic unit 13.

The hydraulic unit 13 can also adjust the stress, and is equipped with a vibration detector 32, a bending load detector 33, a torsion load detector 36, a shear load detector 38, and a tension/compression load detector 39. It has the function of detecting each load and retreat applied to the pipe joint 20, grasping the stress from the load displayed on the control device 11, and adjusting it to an appropriate value.

In particular, even if each load fluctuates from the set value when each stress and vibration are combined, the load can be reset as necessary from the load displayed on the control device 11.

The control device 11 is also equipped with a recorder to record all detected loads as necessary.

In addition, in order to make it possible to mount a sample type joint, an L-type sample mounting 7 flange 22 is also installed.

The leakage detection device 50 is mounted on the arm of the bending stress machine 34 and electrically detects fluid leakage, which is displayed and recorded by the control device 11.

When detecting a gas leak, the test tube joint 20 is enclosed in a sealed box and a He deductor is attached.

Although the test apparatus of FIG. 1 is designed for vertical testing, it can be made into the horizontal testing apparatus of FIG. 2 by using a horizontal test frame 10'.

Since high-temperature nitric acid flows through the internal pressure pressurizing piping 41, the corrosion monitoring system 12 monitors the corrosion state of the piping to clarify the timing of maintenance. The corrosion monitoring system 12 is a known system, and as shown in FIG. 4, it includes a corrosion meter 91 that measures potential based on the AC impedance method, an environmental factor measuring meter 92 that measures pH, electrical conductivity, and temperature. It is composed of a personal computer 94 for processing these data, a floppy disk 96 for recording the data, and a printer 97 for printing out the data.

This device uses nitric acid,
It consists of a device that selects and circulates three types of fluids: organic solvent and He gas.

FIG. 3 shows the system of the device for circulating the fluid of the present device. The system of this device includes a nitric acid system, an organic solvent system, and a He gas system, and there is a section where each fluid flows in common, a cleaning system for cleaning the nitric acid system, and a switching valve unit)62. 65
It is switched with .

The nitric acid system includes a tank 64, a pump unit 63, a switching valve unit 62, a heater 61, a cooler 66, a switching valve unit 65, a test section 1, a pressure recorder 81, a temperature recorder 82,
It consists of a nitric acid supply tank 74.

To use the nitric acid system, open the nitric acid system valve in the switching valve unit 62°650 and close the other valves. Thereafter, nitric acid is supplied from the nitric acid supply tank 74 to the tank 64, the pressure is adjusted in the tank 65, and the pump unit 63 circulates it. The circulating nitric acid is heated by a heater 61 immediately before the test section 1,
After passing through the test section 1, it is cooled by a cooler 66. For this reason, the organic solvent system of the test section 1 includes a tank 69, a pump unit 71, a switching valve unit 62, a heater 61, a cooler 66,
The switching valve unit 65 includes a test section 1, a pressure recorder 81, and a temperature recorder 82.

To treat organic solvent systems, selector valve unit 62.65
Open the organic solvent system valve and close the other valves. Thereafter, in the same manner as the nitric acid system, the tank 69 is filled with an organic solvent, the pressure is adjusted, and the pump unit 71 circulates the solvent.

The He system includes a tank 68, a circulator 67, and a switching valve unit 6.
2. Heater 61, cooler 66, switching valve unit 65,
It consists of a test section 1, a pressure recorder 81, and a temperature recorder 82.

To use the He system, select H of the switching valve unit 62°65.
Open the e-system valve and close the other valves. Thereafter, He is supplied from the He cylinder 76 to the tank 68, the pressure within the tank 68 is adjusted, and the He is circulated by the circulator 67.

After the test is completed, the nitric acid system is drained from the tank 64 using a drain, and the tank 64 is filled with the cleaning water supply device 75 to circulate the system and drained.The organic solvent system is drained into the tank 69. After removing the organic solvent with the drain, wash it in the same way as with nitric acid.

Purify.

The He system is largely degassed by the tank 68 and the vacuum pump 73. At the same time, the air cylinder 72 is opened to increase the efficiency of degassing.

Air cylinder 72 is also used to increase the pressure in tanks 64,69.

According to this embodiment, mock-up tests of various remote joints used in reprocessing plants can be easily repeated many times.

〔Effect of the invention〕

The effects of the present invention are shown below.

1. Compressive stress, tensile stress, screw stress, shear stress, bending stress, and vibration can be freely adjusted and applied while fluid is flowing through the supply pipe joint, so it is the same as in actual use. A leak test can be performed in this condition.

λ With fluid flowing through the supply pipe joint, compressive stress, tensile stress, torsional stress, shear stress, bending stress, and vibration can be freely adjusted and applied, which limits the sealing state of the pipe joint. You can investigate the condition.

3. Since the temperature, pressure, and flow rate of the fluid flowing into the supply pipe joint can be changed, it is possible to investigate differences in the external force state that limits the sealing state of the pipe joint due to differences in the state of the internal fluid.

[Brief explanation of drawings]

Figures 1 and 2 show one embodiment of the present invention, and are bird's eye diagrams centered on the test section where the pipe joint is fixed.
The figure shows a vertical type test device, and Figure 2 shows a horizontal type test device. Figure 3 shows the configuration of the system for this test, and Figure 4 shows the configuration of the corrosion monitor link system used in this test equipment. 10... Main body frame, 11... Control device, 12.
... Corrosion monitoring system, 13 ... Hydraulic unit, 20 ... Test pipe fitting, 21 ... Straight type installation 7
U/J, 22, ... Mounting 7 lunge for L-sized specimen, 23
...Mounting 7 lange, 31... Vibration machine, 32... Vibration detector, 33... Bending load detector, 34... Bending stress machine, 35... Screw stress machine, 36 ... Screw load detector, 37... Shear stress machine, 38... Shear load detector, 39... Tensile compression load detector, 40...
・Tensile compression stress machine, 41... Piping for internal pressure pressurization, 50.
... Leak detection device, 1... Test section, 61... Heater, 62... Switching valve unit, 63... Pump unit, 64... Tank, 65... Switching valve unit, 6
6... Cooler, 67... Circulator, 68... Tank, 69... Tank, 71... Pump unit, 72
...Air cylinder, 73...Vacuum pump, 74...
Nitric acid supply tank, 75...Washing water supply device, 76...
・He cylinder, 81...pressure recorder, 82...temperature recorder. Agent Patent Attorney Akio Takahashi Figure 2 Iris Figure 3

Claims (1)

[Claims] 1. Pipe joint reliability test consisting of a device for flowing fluid into the test pipe joint, a device for applying a load to the test pipe joint, and a device for detecting leakage in the test pipe joint. In the equipment, with fluid flowing through the pipe joint under test, load in the compression direction, tension direction, torsion direction, shear direction, bending direction, and forced vibration are applied singly or in combination to check for leakage in the pipe joint. A pipe joint reliability testing device characterized by: 2. The pipe joint reliability testing device according to claim 1, which is capable of electrically confirming the presence or absence of leakage in the pipe joint. 3. In the pipe joint reliability test equipment, a heater is installed in front of the pipe joint under test, and a cooler is installed at the back to ensure that the fluid reaches the temperature when the pipe joint is actually used. The temperature of the fluid can be increased immediately before it flows into the pipe fitting, and the temperature of the fluid can be lowered to prevent high-temperature fluid from flowing into the system of this device immediately after the fluid flows out of the pipe fitting, and the pressure of the fluid in the pipe fitting can be lowered. 2. The pipe joint reliability testing device according to claim 1, wherein the pipe joint reliability testing device is capable of adjusting the flow rate. 4. A pipe fitting reliability testing device is used to monitor the corrosion state of systems in which high-temperature fluids flow. A device that continuously measures the corrosion rate of metal materials based on their polarization resistance, a device that continuously measures various corrosive environmental factors of corrosive media, and the correlation between these measured corrosion rates and corrosive environmental factors. and an environmental control device that changes the environmental factors to prevent corrosion when the corrosion rate fluctuates significantly from the reference value based on the calculated correlation.
2. The pipe joint reliability testing device according to claim 1, wherein maintenance timing of the testing device can be clearly indicated by monitoring the test device.