Pressure test with purge gas

For pressure testing the Pressure control panel BM55-2A, inert gas (non-reactive) gas is used (connect to HPI). Ensure that the required pressure is present and there is a valve present for shutting off the purge gas (PGI).

If no process gas shut-off valve PLI is present in the outlet of the pressure control panel, the complete line network is tested to the consumer and then purged. This must be carried out via an exhaust gas valve on the consumer. To do this, refer to the system documentation for the consumer.

1. Close all valves and fully depressurise the pressure regulator by turning the handwheel anti-clockwise as far as it will go.
2. Open valves PGI and HPI to build up pressure in the system.
3. Slowly open the pressure regulator and build up pressure.
4. Wait until the pressure has been built up and close the PGI valve.
5. Check whether the displays on PG P1 and PG P2 are identical. If both pressure gauges show the same pressure, release the pressure on the pressure regulator. If the values do not match, check the pressure regulator setting and readjust if necessary.
6. Leave the pressure for 10 minutes.
7. After 10 minutes have elapsed, check that the values on PG P1 and PG P2 still match and whether the pressure has remained constant.
8. If there is no change, release the pressure control panel via valve HPV and close all valves.

If the pressure has reduced, perform a leak test to check where the gas is escaping, repair the connection and repeat the pressure test. The line network can then be purged clear up to the consumer.