Mercer Valve Pressure Relief Valve 81-16151V18G21

Offsite testing allows for the most thorough and accurate testing and inspection. The valves are removed from the units and brought to a shop.

In the shop a valve can be completely tested and inspected.; The shop environment gives the technician the most advantages because more tools are available, there is adequate space to work, and test benches enable accurate results.

All of the same concerns in testing are still present in offsite testing as in situ testing.

The volume of pressure, valve simmer, pressure losses to the gauges, and supply line pressure are all factors in getting an accurate result.

Proper assembly of a test bench is crucial in limiting these effects. The main disadvantage in offsite testing is time.

A valve must be removed from the unit and then transported to the shop. After testing, it is transported back to the field to be installed.

This time frame can be long and cause delays

For gas/vapor valves, there should be approximately 1/4 ft^3 (7 liters) or more capacity below the valve when setting.

This volume is sufficient to test the set pressure for most 4 x 6 M orifices and smaller valves accurately.

Warning: This procedure requires trained personnel!

Are two pressure gauges used for testing?

Are the gauges reading identical values within their respective tolerances?

Select the type of the first gauge

Select the type of the second gauge

Is the analog (dial) gauge not liquid filled?

Does the digital gauge respond to quick pressure increases?

Does the test gauge have at least 0.25% accuracy over their full scale?

Is the portion of the gauge used more stringent than the set pressure's tolerance?

Warning: This procedure requires trained personnel with PPE!

If system is not operational, report the issues to the maintenance team and stop the procedure

Is the outlet pipe still attached?

Are the internal parts observable for visual inspection?

Are block valves present for set pressure testing?

Enter the volume under the valve

Warning: Ensure the valve is not pressurized before starting the inspection

Cap and Seal Wire in good condition

Seal wire has the impression of the certified company

Flanges Connections in good condition

Threaded Connection in good condition

Outlet free of corrosion or debris

External Surface free of damage

Valve Tag information corresponds to the service conditions

If any of the checks fail, do not proceed with the set pressure inspection and the leak inspection

Warning: This maintenance check requires qualified repair personnel!

Is the PRV correct for the application?

Are there any apparent problems with the PRV?

Is the nameplate information correct?

Is there any damage to the valve?

Are there any issues that would keep the valve from opening or inhibit flow?

Are there any problems found during the visual inspection?