Spectron Gas Control Systems GmbH
Installation | 5
GES_BE56-2U-VCR_1020
17
5.3 Checking the system
Before beginning the test, ensure that the controller (if present) is ready for operation and is in
manual mode.
5.3.1 Pressure test with purge gas
For pressure testing the Pressure control panel BE56-2U-VCR, 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.
5.3.2 Helium leak test
A pressure test must be performed before the helium leak test. The description below assumes
that the pressure control panel is in safe condition after the pressure test (chapter 5.3.1).
1. Connect the helium leak tester to the consumer after the exhaust gas valve.
2. Open valves HPI and PLI. Open the pressure regulator fully.
3. Set the system under vacuum until the maximum possible value is reached (up to 5 mbar).
4. Spray joints and components with helium starting from above.
The leakage rate should be at least 1x10
-9
mbar l/s He.
If the test is passed:
1. Switch off the vacuum.
2. Close the waste gas valve on the process.
3. Open valve PGI.
4. Close valve PGI.
5. Disassemble the leak test device and connect the exhaust gas line to valve HPV.
6. Relieve the pressure regulator.
7. Close all valves.
The system should now be filled with inert gas (approx. 1 bar overpressure) up to the consumer.
