How to Test a Bulk Propane Tank

Bulk propane tanks are typically used as part of a commercial bulk propane plant or as part of a large-scale unit and should have a National Board Number to verify the original manufacturing information of the propane tank, including a pressure test. However, if any bulk propane tank is suspected to have lost pressure, the tank should be re-tested immediately. Note that only authorized people familiar with bulk propane storage and pressure testing should ever perform a test and others should leave the area immediately until any possible gas leak has been identified and addressed.

High pressure gauge
Test adapter

Instructions

- 1
  Close the container service valve and perform the propane safety check as specified by your company or local regulations.
- 2
  Connect a 30 psi pressure gauge onto the downstream side of the first stage regulator. Do not extend the pressure gauge past the second regulator. Slowly open the service valve on the tank and leave the valve open for three seconds and then close the valve.
- 3
  Open the vapor distribution piping system valve until the system pressure drops by 5 psi on the pressure reading gauge, then close the vapor distribution piping system valve. This will unlock the vapor distribution system and notify the leak gauge of any potential leaks in the system.
- 4
  Monitor the pressure gauge reading after closing the vapor distribution piping system valve until pressure stays steady for three minutes without any increase or decrease.
- 5
  Write down the test pressure and the date and time. Disconnect the test adapter and pressure gauge from the propane tank and replace the tank regulator plug.
- 6
  Open the service valve. This will re-pressurize the system. Use a separate leak detection device on the test tap to check for any possible leaks.
- 7
  Follow your company or local regulation procedures to return the propane tank back into service once no leaks are detected.

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