JP2513479Y2 - Safety valve test equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel safety valve testing device, and more particularly to a safety valve provided in a release line which is provided by being branched to a plant pipe and which is released to the atmosphere when the pipe internal pressure exceeds a predetermined pressure. The present invention relates to a device capable of performing a release test while being installed.

[0002]

2. Description of the Related Art Generally, in a plant piping system for transferring a fluid such as LNG or LPG, a safety valve is provided to reduce the internal pressure of the pipe when the internal pressure of the pipe reaches a predetermined pressure or higher in order to prevent the pipe from being damaged due to abnormal pressurization. A discharge line having is provided. As a conventional discharge line, the structure shown in FIG. 2 is known. As shown in the figure, the plant pipe 1 is provided with a discharge line 2 branched from this.
A large number of the discharge lines 2 are provided in the plant pipe 1 at each position where there is a possibility of being blocked by a valve or the like. These discharge lines 2 are provided with an opening / closing cutoff valve 3 located on the upstream side of the plant pipe 1 and a safety valve 4 on the downstream side thereof. The opening / closing shutoff valve 3 is always open when the plant pipe 1 is in an operating state, and when the pressure inside the plant pipe 1 is increased to a predetermined pressure or higher, the safety valve 4 of the release line 2 is automatically opened and released to the atmosphere. Is configured to. In this way, the safety valve 4 for releasing the internal pressure to the atmosphere when the pressure inside the plant pipe 1 is abnormally increased is provided indoors and outdoors. Further, the safety valve 4 of the discharge line 2 is to be opened / closed only when the pressure inside the plant pipe 1 is abnormally increased. Needs maintenance. Generally, a discharge test is performed as a maintenance and inspection work of the safety valve 4.

Conventionally, in the discharge test of the safety valve 4, the open / close shutoff valve 3 of the discharge line 2 is closed, the safety valve 4 is removed from the discharge line 2, and then the safety valve 4 is carried to a factory or the like.

[0004]

However, in the conventional discharge test of the safety valve, the safety valve 4 is removed from the discharge line 2 of the plant piping 1 and the safety valve 4 is removed in a factory or the like. There was a problem that the internal pressure of the pipe could not be released in order to reduce the pressure when the pressure was raised to a dangerous state and the safety of the plant was maintained. Therefore, it has been required that the discharge test as a maintenance and inspection work of the safety valve be performed promptly.
In addition, when the safety valve discharge test was conducted for a long period of time, it was necessary to attach a spare safety valve to the discharge line. further,
As described above, the plant piping 1 is provided with a large number of discharge lines 2, and each discharge line 2 is provided with a safety valve 4. Therefore, it is a complicated work to remove these safety valves 4 and perform a discharge test. Met.

Therefore, an object of the present invention is to solve the above-mentioned problems and to perform a discharge test without removing the safety valve 4 from the discharge line 2, facilitating maintenance and inspection work of the safety valve and safety of plant piping. It is intended to provide a safety valve test device capable of increasing the safety.

[0006]

In order to achieve the above object, the present invention is directed to a plant pipe for transferring a fluid such as LNG or LPG, which is discharged to the atmosphere or the like when the inside of the pipe reaches a predetermined pressure or more. In an inspection device for a safety valve that reduces the internal pressure of a pipe, an opening / closing shutoff valve provided in a discharge line connecting the plant pipe and the safety valve and a safety valve provided in a discharge line between the opening / closing shutoff valve and the safety valve for operating the safety valve A compressed air introduction nozzle for introducing compressed air and a compressed air supply means supported by the traveling carriage for supplying working compressed air to the compressed air introduction nozzle and a safety valve driven when the safety valve is driven by the compressed air supply means supported by the traveling carriage. And a safety valve drive state detecting means for detecting the state.

[0007]

According to the above construction, the compressed air introducing nozzle is provided in the discharge line and the compressed air is supplied to the traveling vehicle to supply the compressed air to the compressed air introducing nozzle, and the safety valve drive state detecting means for detecting the drive state of the safety valve. By providing the above, it is possible to supply pressured air from the pressured air supply means of the traveling carriage to the pressured air introduction nozzle of the discharge line to perform the discharge test of the safety valve installed on the discharge line. Further, since the traveling vehicle is provided with means for detecting the drive state of the safety valve to be subjected to the release test, the test result can be detected at the same time as the release of the safety valve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the plant piping is provided with a discharge line 2 which is branched as in the conventional example. A pressure air introduction nozzle 5 for introducing pressure air is provided in the discharge line 2 between the opening / closing shutoff valve 3 and the safety valve 4.
Further, the pressure air introduction nozzle 5 is provided with a flange joint 6 for connecting to a pressure air supply means described later.

On the other hand, the traveling carriage 7 is provided with the compressed air supply means 8 and the safety valve 4 is activated when the safety valve 4 is driven.
The safety valve drive state detection means 9 for detecting the drive state of is provided. The compressed air supply means 8 is mainly composed of a compressor 10 for increasing the pressure of the inert gas or air, and a pressure accumulating drum 11 for accumulating the pressure of the air increased by the compressor 10. A pressure air transfer line 12 connected to the pressure air introduction nozzle 5 is connected to the pressure accumulating drum 11.
A flexible pipe 1 is provided at the tip of the compressed air transfer line 12.
3 is connected, and this flexible pipe 13 is detachably attached to the flange joint 6. A compressed air transfer line 14 connecting the compressor 10 and the accumulator drum 11 is provided with a compressed air adjusting valve 15 and a shutoff valve 16, and a bypass connecting the upstream side and the downstream side of these compressed air regulating valve 15 and the shutoff valve 16. A passage 17 is provided. A bypass opening / closing valve 18 is provided in the bypass passage 17. Therefore, the air or the like pressurized by the compressor 10 is sent to the accumulator drum 11 through the bypass passage 17 of the compressed air transfer line 14, and the safety valve 4 to be tested is tested.
The pressure is accumulated by the pressure accumulating drum 11 up to a pressure close to the discharge set pressure value. The accumulator drum 11 is provided with a pressure gauge 19, which detects that the pressure in the accumulator drum 11 has reached the approximate value and closes and shuts off the bypass opening / closing valve 18 of the bypass passage 17. The valve 16 and the pressure adjusting valve 15 are opened, and the pressure adjusting valve 15 supplies pressure air from the compressor 10 to the pressure accumulating drum 11 until the safety valve 4 operates, but the pressure exceeds 10% of the set pressure of the safety valve 4. It is configured to boost up to.

On the other hand, the traveling vehicle 7 is provided with a safety valve drive state detecting means 9, and as one of the constituents of the detecting means 9, the release sound of the safety valve 4 extended from the traveling vehicle 7 and subjected to the emission test. Alternatively, a detection sensor-20 for detecting vibration is provided. The output side of the detection sensor 20 is provided with an arithmetic circuit 21 for determining whether or not the safety valve 4 is normal based on the emitted sound or vibration of the safety valve 4 obtained. The arithmetic circuit 21 and the detection sensor 20 mainly constitute the safety valve drive state detection means 9. A recorder 22 is connected to the output side of the arithmetic circuit 21. The safety valve drive state detecting means 9 controls so that the shutoff valve 16 is closed and the compressor 10 is stopped at the same time when the safety valve 4 is operated in order to maintain the blow-off pressure after the safety valve 4 is operated. The circuit is included.

Next, the operation of the embodiment will be described.

In carrying out the discharge test of the safety valve 4 of the discharge line 2, the traveling carriage 7 is carried to the vicinity of the safety valve 4 and the opening / closing cutoff valve 3 is closed. After closing the on-off shutoff valve 3, the flexible pipe 13 as the compressed air supply means 8 is connected to the compressed air introduction nozzle 5.
The compressor 10 through the flange joint 6
Is driven to accumulate an inert gas or air from the pressure accumulating drum 11 to the discharge pipe section after the opening / closing shutoff valve 3. Pressure is accumulated in the pressure accumulating drum 11 while detecting the pressure gauge 19 until the discharge set pressure of the safety valve 4 to be tested is approximated from the compressor 10 via the bypass passage 17. Specifically, the pressure is increased to about 90% of the set pressure to accumulate the pressure. After that, the bypass opening / closing valve 18 is closed, the pressure regulating valve 15 and the shutoff valve 16 are opened, and the safety valve 4 operates until the pressure exceeds 10% of the set pressure of the safety valve 4, and the limit is from the compressor 10 to the accumulator drum 11. The compressed air from the pressure accumulating drum 11 is passed through the safety valve 4 to achieve the discharge test. When the pressure air is supplied from the pressure accumulating drum 11 to the safety valve 4 and is being discharged, the detection sensor-20 detects a driving state of the safety valve 4 such as a sound emitted from the safety valve 4 or a vibration, and outputs it to the arithmetic unit 21. The calculator 21 compares the normal operation data of the safety valve 4 with a signal obtained from the detection sensor 20 and the pressure gauge 19 to determine whether or not the safety valve 4 actually released is abnormal. Further, since the recorder 22 is connected to the arithmetic unit 21, the record can be written on a recording paper or the like.

In particular, the arithmetic unit 21 is constructed so as to detect the respective pressures of the front leakage, the blowout, and the blowout by the signal from the pressure gauge 19 during the discharge test of the safety valve 4 and compare and record them. .

As described above, since the release test of the safety valve 4 can be performed by directly introducing the compressed air into the release line 2, it is possible to perform the test with the safety valve 4 attached to the release line 2, so that an accurate test result can be obtained. In addition, since the safety valve 4 is not removed from the discharge line 2, the workability thereof can be improved. Further, the release test can be performed without removing the safety valve 4, and the test can be achieved in a short time, so that the safety of the plant can be continuously maintained. In the figure, reference numeral 24 is a discharge safety valve provided in the pressure accumulating drum 11, and 25 is a line for introducing an inert gas or the like to the compressor 10.

[0016]

According to the present invention, the following excellent effects are exhibited.

(1) The discharge test can be performed with the safety valve of the discharge line provided in the plant piping installed in the discharge line.

(2) The safety valve release test can be accomplished in a short time, and the safety of the plant equipment can be continuously maintained.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a schematic view showing a conventional example.

[Explanation of symbols]

 1 Plant piping 2 Release line 3 Open / close shutoff valve 4 Safety valve 5 Pressure air introduction nozzle 7 Traveling vehicle 8 Pressure air supply means 9 Safety valve drive state detection means

Claims (1)

(57) [Scope of utility model registration request] 1. A safety valve inspection device for reducing the internal pressure of a plant pipe for transferring a fluid such as LNG or LPG, which is released to the atmosphere or the like when the pressure inside the pipe becomes a predetermined pressure or higher, An on-off shutoff valve provided on a discharge line connecting the safety valve, and a compressed air introduction nozzle provided on a discharge line between the on-off shutoff valve and the safety valve for introducing pressurized air for operating the safety valve and the compressed air supported by a traveling carriage. The system is provided with a compressed air supply means for supplying working compressed air to the introduction nozzle, and a safety valve drive state detection means for detecting a drive state of the safety valve when the safety valve is supported by the traveling carriage and the safety valve is driven by the compressed air supply means. A safety valve testing device characterized in that