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PSVs Calibration |
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PSVs Calibration Activities- Site procedures
- Conduct T.B.T for the working Team
- Issue the permit for the Job
- Organize with the process personnel to mechanically de-isolate the valve
- Vent the valve
- Perform gas test to assure 0% LEL
- Using proper tools, start dismantling the valve
- Using inspected lifting gears, lift the valve on the truck
- Install blind flanges for the pipe line
- Test Bench method Statement
- Select the proper seal ring according to valve size and fix on test bench
- Use proper lifting equipment to rig the valve vertically on the test bench
- Using attached tables, select the proper clamping pressure
- Start clamping the valve with the three- Jaw clamp ( note that the valve output should be directed inner wards for safety reasons)
- Enter the valve data and the valve set pressure
- Close the vent valve of the machine and start pressurizing
- Close the pressure valve as soon as the valve pops
- Leave the valve pressurized for about one minute and notice the computerized graph
- Vent the pressure
- Print the test results
- If the results are not accepted ( by the software), then the valve needs repair
- Unclamp the valve and dismantle for repair
- If the valve leaks slightly ( the slope of the curve goes down), then perform leak test on the valve
- Select the proper leak test flange and connect to the bubble tester
- After clamping the valve, pressurize to 0.9 of the set pressure
- Start bubble counter and notice the results.
- Print the results. If the results are not accepted ( by the software), then the valve needs repair
- If the results are accepted, print the final report, which includes the valve data, set pressure results & leakage results.
- Safety precautions for working on test bench
- Trained person must work on the unit
- PPE is obligatory during working on the unit.
- Be sure that the machine is filled with air
- Check the three Jew clamps that they are working
- Before mounting or removing the valve on the clamping desk, the unit must be ventilated.
- Oil and grease may never be used at gas test.
- When using cylinder pressure reducer, the pressure reducer connector must directly made with the cylinder valve connection, the use of adapter is not permitted.
- Maintenance and repair may only be performed by trained expert.
- Vent valve is set at the factory setting during assembly and don't need further adjust.
- Never open on loosen vessel cover tube connection parts under pressure. always depressurize vessel before opening.
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| Also On Site | | | | | | | | | | |
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