KR200264517Y1 - Rtm test system - Google Patents

Abstract

The purpose of this RTM test system is to provide a safety valve test system that can measure the ejection pressure and the stop pressure of the safety valve at the normal operating pressure without removing safety valves of various piping lines.

The RTM test system of the present invention artificially lifts the valve spindle at the top of the valve of the safety valve by the hydroelectric power pack part and loads the force required at that time (i.e., when the disc and seat of the safety valve are separated). Detect and record on the recorder chart of the display part. By dividing the above force by the effective area of the seat diameter of the safety valve, it is an inspection device that can measure the precise ejection pressure of the valve. In other words, by applying mechanical force to the valve spindle of the safety valve and recording the force (discharge pressure) at the moment when the disc of the safety valve is separated from the seat on the recorder chart connected to the load cell, the ejection pressure and stoppage of the safety valve are calculated. Measure the pressure. At this time, an accurate value within 1% of the ejection pressure can be obtained.

Description

RTM TEST SYSTEM

The RTM test system relates to equipment that measures the set and stop pressures of safety and relief valves.

The RTM test system can also test safety valves manufactured by all domestic and foreign manufacturers.

Conventionally, the safety valve had to be removed from the device in order to test the ejection pressure and the stop pressure of the safety valve. In addition, if the test is mounted on the device, the operation is stopped and the test is performed, or if it is in operation, the pressure must be raised to the set pressure on the safety valve to meet the test conditions. There was also a lot of loss.

Considering the above circumstances, this RTM test system is designed to effectively test the safety valve in cold TESTING and HOT TESTING.

First, the test of the RTM test system in the COLD TESTING state will be described. COLD TESTING means that the test can be carried out when no process pressure is applied to the safety valve. Safety valves that cannot be tested during plant operation can be tested with this RTM test system to determine if repairs are required during shutdown. In new plants, safety valves can be tested with this RTM test system before starting. In the case of bench test of safety valve in the workplace, it is necessary to repair only safety valve that has a difference by comparing the test result performed in the previous cold TESTING state with the result of bench test. do.

Next, the test of the RTM test system in the hot TESTING state will be described. HOT TESTING is a test of the safety valve under normal operation. Therefore, it can be applied to the safety valve of welding type or the safety valve which cannot pressurize beyond the operating pressure. In case of testing this RTM test system in the hot TESTING state, since the test is performed in the normal operation state, it is not necessary to raise the system pressure, which saves fuel cost, and does not require temperature compensation for the ejection pressure. Can be adjusted on site without removal. It is also economical because it reduces the time required for testing.

The purpose of this RTM test system is to provide a safety valve test system that can measure the ejection pressure and the stop pressure of the safety valve at the normal operating pressure without disconnecting the safety valve of the various piping lines from the piping line.

1 is a diagram showing the overall configuration of the present RTM test system.

Fig. 2 is an exploded view illustrating the disassembled mechanical parts of the present RTM test system.

Fig. 3 is a graph showing the ejection pressure and the stop pressure recorded in the recorder chart of the display part in the present RTM test system.

Explanation of symbols on the main parts of the drawings

MP: Machine part

1: handle 2: gear box

3: base spindle 4: base plate

5: pillar plate 6: lock bolt

7: pillar shaft 8: hydraulic ram

9: pillar head 10: lock pin

11: lifting shaft 12: lifting nut

DP: Display part

20: load cell 21: linkage nut

22: cable 23: recorder chart

24: digital displayer

25: zero span adjustable kit

26: calibration kit

HP: hydraulic power pack part

27: power pack 28: accumulator gauge

29: flow control valve 30: hydraulic hose (connection)

SV: Safety Valve (Test Object)

31 valve body 32 valve spindle

33: disc 34: seat

In the RTM test system according to the invention of claim 1 and the RTM test system for testing the ejection pressure and the stop pressure of the safety valve, the disk and the seat of the safety valve are lifted by lifting the valve spindle of the safety valve. A hydraulic power pack part that accumulates a force for separating the pressure, a hydraulic ram that lifts the valve spindle of the safety valve using a force supplied from the hydraulic power pack part, and a valve spindle of the safety valve. A mechanical part comprising a load cell for storing the lifting force as data, a safety valve head fixing part for fixing the safety valve, a connecting part for transmitting the force accumulated in the hydropower pack part to the mechanical part, Data stored in the load cell And a display part including a cable for transmitting and a recorder chart for automatically recording data transmitted through the cable.

The RTM test system according to the invention of claim 2 is characterized in that the hydroelectric power pack part is electrically driven.

Conventionally, the equipment for testing the safety valve has been tested using the air compressor to drive the hydraulic pressure as the driving source and the stop pressure and the stop pressure of the safety valve, the present RTM test system adopts the electric drive method. Therefore, the system overcomes the limitations of the limitation of the place that can be used only in the place where the conventional air compressor is installed because it can be driven in any place where there is electricity.

The RTM test system according to the invention of claim 3, wherein the display part includes a digital display that automatically calculates and digitally displays the popping pressure and the reset pressure. Doing.

Here, the popping pressure means a pressure that separates the disk and the seat of the safety valve by applying a constant pressure to the valve spindle of the safety valve. That is, the popping pressure means a lifting pressure (pressure for lifting the valve spindle). In contrast, the ejection pressure in claim 1 represents the pressure set in itself when the safety valve is manufactured. In other words, when a pressure greater than a certain pressure is applied to the valve spindle of the safety valve, it means a pressure at which the disc and the seat of the safety valve start to separate.

In addition, the reset pressure refers to the pressure at which the disc and the seat of the safety valve return to their original position after separating the disc and the seat of the safety valve by applying a constant pressure to the valve spindle of the safety valve. In contrast, the stop pressure in claim 1 represents the pressure set in itself when the safety valve is manufactured. That is, when a pressure greater than a certain pressure is applied to the valve spindle of the safety valve, it means the pressure that the disk and the seat of the safety valve return to their original position after the disk and the seat of the safety valve are separated.

The RTM test system according to the invention of claim 4 is connected to a computer instead of the display part, and automatically calculates and displays digitally the popping pressure and the reset pressure.

In the embodiment of the present invention has been described in the case of connecting the display part, it is also possible to use a notebook PC or an industrial computer in connection with the display part.

Example 1

The RTM test system of the present invention artificially lifts up the valve spindle 32 at the top of the valve of the safety and relief valve SV by means of a hydraulic power pack part HP. That is, the force required for the disc 33 (disc) and seat 34 (seat) of the safety valve SV is sensed by the load cell 20, and the recorder chart 23 and the digital display of the display part DP are displayed. Record it by sending it to a digital displayer24. By dividing the force by the effective section of the seat diameter (set diameter) of the safety valve SV, it is an inspection device capable of measuring the correct set pressure of the safety valve.

That is, by applying a mechanical force to the valve spindle 32 of the safety valve SV and recording the force (ejection pressure) at the moment when the disc 33 of the safety valve SV is separated from the seat 34 on the recorder chart 23 connected to the load cell 20 to calculate the ejection pressure Measure the ejection pressure and stop pressure of the safety valve SV. At this time, an accurate value within 1% of the ejection pressure can be obtained.

Blowing pressure can be obtained by the following formula.

Blowing pressure (kg / cm 2) = (RTM test force (kg.F) / cross section of valve seat (cm 2)) + operating pressure (kg / cm 2)

The RTM test system of the present invention is a machine part MP consisting of a hydraulic ram 8 and the like, and a disc 33 and seat 34 by lifting the valve spindle 32 of the safety valve SV. By means of a load cell 20 that detects the hydraulic power pack part HP accumulating the force to separate the force) and the force applied to separate the disc 33 and seat 34 of the safety valve SV. It consists of a display part DP that automatically records.

The operation of the RTM test system of the present invention will be described in detail with reference to FIGS. 1 and 2.

First, the hydropower power pack part HP will be described. The hydraulic power pack part HP is an electric device, which accumulates a constant pressure to separate the disc 33 and the seat 34 of the safety valve SV, which is a test object, and the accumulated pressure is transferred to the mechanical part through the flow control valve 29. The disk 33 and seat 34 of the safety valve SV are separated by supplying the hydraulic ram 8 of the MP and lifting the valve spindle 32 of the safety valve SV. First, a power source is connected to the hydraulic power pack part HP, and the pressure value of the discharge pressure of the safety valve SV to be tested is input to the power pack 27 of the hydraulic power pack part HP to accumulate the pressure. Check the pressure gauge 28 and open the flow control valve 29 to supply the accumulated pressure from the hydraulic power pack part HP to the hydraulic ram 8 of the mechanical part MP through the hydraulic hose 30.

Second, the machine part MP will be described. Fig. 2 is an exploded assembly view showing the components of the mechanical part MP disassembled. First, the assembling process of the mechanical parts will be described. As shown in Fig. 2, the pillar head 9 has a large hole formed in the center thereof, and two small holes formed bilaterally in both directions. The load cell 20 of the display part DP is attached to the valve spindle 32 of the safety valve SV in the lower part of the hydraulic ram 8 and fixed with a linkage nut 21. In the central part of the hydraulic ram 8, a hole is formed to penetrate the lifting shaft 11, and a screw for fastening the load cell 20 is formed in the lower part of the lifting shaft 11. have. Insert the upper part of the hydraulic ram 8 into the center part of the filler head 9, and the lifting shaft 11 penetrates the center part of the hydraulic ram 8 to connect with the load cell 20 and the valve spindle 32 of the safety valve SV 32. Tighten the linkage nut 21 on the Then, a lifting nut 12 is assembled and fixed to the upper portion of the lifting shaft 11.

In addition, the upper part of the filler shaft 7 penetrates through the two small holes formed in both sides of the filler head 9, and lock pin 10 is inserted into the filler head 9 to fix it. The lower part of the filler shaft 7 is inserted into the filler plate 5 and fixed with the lock bolt 6. In addition, the base plate 4 (base plate) is in close contact with each other in the front and rear directions of the pillar plate 5, and the base spindle 3 passes through the holes formed in the base plate 4 and the filler plate 5, respectively. Then, the gearbox 2 passes through the base spindle 3 and the handle 1 is fixed. In addition, the hydraulic ram 8 is connected to the hydraulic power pack part HP by the hydraulic hose 30, and is connected to the display part DP by the cable 22. In addition, the valve spindle 32 and the load cell 20 of the safety valve SV under test are fixed by a linkage nut 21. After all parts are connected, turn the handle 1 to fix the mechanical device MP to the head of the safety valve SV.

Next, the operation of the machine part MP will be described. When the hydraulic pressure pack part HP accumulates the pressure, the hydraulic ram 30 of the machine part MP is supplied through the hydraulic hose 30 by the flow control valve 29, and the hydraulic ram 8 lifts the valve spindle 32 of the safety valve SV. The pressure is supplied until the disc 33 and seat 34 of the valve SV are separated. At this time, the pressure at which the disc 33 and seat 34 of the safety valve SV are separated is the ejection pressure (point A in Fig. 3). In addition, if the pressure supplied to the hydraulic ram 8 is gradually reduced, the disc 33 and seat 34 of the safety valve SV are returned to their original positions. At this time, the pressure at the moment when the disc 33 and seat 34 of the safety valve SV returns to the original position is the stop pressure (point B in Fig. 3).

Third, the display part DP will be described. The display part DP is composed of a recorder chart 23, a digital display 24, a zeroing kit 25 and a calibration kit 26. The display part DP records and prints the force applied to the valve spindle 32 on the recorder chart 23.

The hydraulic ram 8 of the machine part MP stores the value of the force applied to the valve spindle 32 in the load cell 20 to lift the valve spindle 32 of the safety valve SV. The data on the value of the force thus stored is transmitted via the cable 22 to the recorder chart 23 of the display part DP. The data transmitted to the recorder chart 23 is digitized and displayed on the digital display 24 as a result of automatically calculating the popping pressure and the reset pressure. It can also be connected to a computer instead of the display part DP.

Next, the graph recorded on the recorder chart 23 of the display part DP will be described. In Fig. 3, the horizontal axis represents the time for applying pressure (the direction increases from right to left), and the vertical axis represents the force applied. As shown in Fig. 3, as the time for applying the force increases, the force gradually increases, resulting in an instantaneous peak (point A) exceeding the spring tension of the safety valve SV. This peak (point A) represents the pressure at which the disc 33 and seat 34 of the safety valve SV are separated. This is called popping pressure. In addition, after the point A in FIG. 3, the pressure decreases rapidly. Here, there is one inflection point (B point) after A point. This inflection point (B point) represents the pressure at which the disc 33 and seat 34 of the safety valve SV return to their original positions, which is called a reset pressure. That is, from the point a to the point A in Fig. 3, the disc 33 and the seat 34 of the safety valve SV are in their original states, and the pressure at the moment when the disc 33 and the seat 34 of the safety valve SV are separated at the point A, Points A to B indicate the disc 33 and seat 34 of the safety valve SV separated, and point B indicates the pressure at the moment when the disc 33 and seat 34 of the safety valve SV return to their original positions. From point to b, the disc 33 and seat 34 of the safety valve SV are brought back to their original positions.

The operating principle of the RTM test system of the present invention has been described above. In the following, the method of actually testing the relief pressure of the safety valve using the RTM test system will be described in detail.

(How to use RTM test system)

1. Overview

The RTM test system of the present invention artificially lifts the valve spindle 32 at the top of the valve of the safety valve SV by the hydraulic power pack part HP (i.e. the moment when the disc 33 and seat 34 of the safety valve SV are separated). The force value required is sensed by the load cell 20 and transmitted to the recorder chart 23 of the display part DP for recording. By dividing the above force by the effective area of the seat diameter of the safety valve SV, it is a test device that can accurately measure the ejection pressure of the safety valve.

2. Scope

Generally, it is applicable to all valves as a spring load type.

3. Preparation

3-1. Field conditions

1) Prepare a 220V power supply to drive the Hydrolic Power Pack part HP.

2) Check the specifications of the safety valve SV that is the test object (manufacturer, type, size, design set pressure, thread size of valve spindle 32, etc.)

3) Supply power (110V / 220V) to the display part DP.

4) There should be a calibrated pressure gauge to check the base pressure inside the safety valve SV is installed or can be checked in the control room.

5) A space for 50cm device from the top of the valve is required.

4. Calibration of the RTM Test System

The RTM test system should always be tested after calibration.

5. Testing

1) Connect the power supply (220V) needed to drive the Hydrolic Power Pack Part HP and adjust the accumulator (power pack) 27 to accumulate to 250BAR.

2) Remove the air existing in the hydraulic hose 30.

3) In this RTM test system, the popping pressure and reset pressure are calculated automatically and displayed on the digital display of the display part DP.However, the popping pressure and the reset pressure are calculated so that the system can be easily understood. Explain how.

①: Enter the design blowing pressure of the safety valve SV.

②: Enter the line pressure at the time of the test.

③: writes to the seat area A (seat area) of the safety valve SV A = πd calculated by the formula ^2/4 (㎠).

④: ①-② Enter the result of x ③.

⑤: Determine the load cell 20 (the load cell 20 has two types, L (low) and H (high). If the result value of ④ is 200 or less, L is selected, and if 200 or more, H is selected).

⑥: Select recorder chart 23 (determine the adjustment position of the zero adjustment kit 25 according to the result value in ④).

Ex) 190 → 200, 300 → 500, 800 → 1000, 1200 → 2000).

⑦: Enter ④ / 13 + 20.

In this way, the above items are written before the test.

4) Safely remove the top cap of the safety valve SV and fix it firmly to this RTM test system.

5) The hydraulic hose 30 is connected to the hydraulic ram 8 of the machine part MP and the flow control valve 29 of the hydraulic power pack part HP, and the cable 22 is connected to the recorder chart 23 of the display part DP.

6) Once everything is ready, check the power supply, connections, connecting pins, and other necessary items.

7) Check the zero of the recorder chart 23 on the display part DP.

8) Run this RTM test system. When the pressure accumulated in the accumulator 27 of the hydraulic power pack part HP is supplied to the hydraulic ram 8 of the mechanical part MP through the flow control valve 29, the hydraulic ram 8 lifts the valve spindle 32 of the safety valve SV and releases the safety valve. The disc 33 and the sheet 34 of the SV are lifted until they are separated (actually about 1 to 2 mm). At this time, a popping point and a reset point at the moment when the disc 33 and seat 34 of the safety valve SV are separated are shown in the graph. At this time, input the position on the output graph in ⑧. Based on the results from ⑧, arrange as follows.

⑨: The result of ⑧ x The value of ⑥ (The value of ⑥ is 1 for 100, 2 for 2, 20 for 20)

⑩: Result of ⑨ / ③

⑪: calculated by the formula ⑩ + ②.

This is the actual popping pressure.

9) Repeat the steps 4) to 8) above to adjust the value of the popping pressure to the tolerance of the design ejection pressure.

10) In the above, the method of obtaining the value of the popping pressure has been described. In addition, since the method for obtaining the reset pressure is the same process as that described above, the description thereof will be omitted. In this RTM test system, the above process is automatically calculated so that the popping pressure and the reset pressure are displayed numerically on the digital display 24 of the display part DP.

11) Once all procedures have been completed (i.e. the safety valve SV is within the acceptable range for the test results of this RTM test system), refit the safety valve SV cap in its original condition.

The RTM test system can be used to test safety valves in cold TESTING and hot TESTING.

Safety valves that cannot be tested during plant operation can be tested with this RTM test system to determine if repairs are required during operation. In new plants, safety valves can be tested with this RTM test system before starting. In the case of bench test of safety valve in the workplace, it is easy to follow-up management because it is only necessary to repair the safety valve that made a difference by comparing the test result with the test result in the previous cold TESTING state. .

When testing this RTM test system in the hot TESTING state, the fuel cost is reduced because the pressure of the system is not increased because the test is performed in the normal operation state, and the temperature compensation for the ejection pressure is not necessary, and the welded valve is on-site. I can adjust it in the field without removing it from the. It is also economical because it reduces the time required for testing.

Claims (4)

In the RTM test system, which tests the set pressure and the stop pressure of the safety and relief valve, A hydraulic power pack part that accumulates the force for separating the disc and seat of the safety valve by lifting the valve spindle of the safety valve, A hydraulic ram that lifts the valve spindle of the safety valve using the force supplied from the hydraulic power pack part, and a force to lift the valve spindle of the safety valve A machine part comprising a load cell for storing data and a safety valve head fixing part for fixing the safety valve; A connecting portion for transmitting the force accumulated in the hydrolytic power pack part to the mechanical part, A cable for transmitting data stored in the load cell; A display part having a recorder chart for automatically recording data transmitted through the cable RTM test system, characterized in that consisting of. The method of claim 1, The hydroelectric power pack part is electrically driven RTM test system, characterized in that. The method of claim 1, And the display part has a digital display which automatically calculates the popping pressure and the reset pressure and digitally displays the RTM test system. The method of claim 3, It is connected to a computer instead of the display part and automatically calculates the popping pressure and the reset pressure. RTM test system, characterized in that.