Exchanging the process gas source
WARNING

Gas source exchange
If a gas source exchange is performed incorrectly, gas leakage and poisoning of persons may occur.
- The gas source exchange are to be carried out by trained specialist personnel and never unattended.
- A pressure test must be conducted after each gas source exchange.
- For each gas source exchange, a new seal suitable for the used gas is to be used.
- Wear the personal protective equipment prescribed in the risk assessment.
With each gas source exchange, check the port for leak-tightness. We strongly recommend replacing the gasket every time the gas source is exchanged. Always turn the shut-off valves slowly and as far as the stop when opening or closing them!
Removing the empty process gas source:
- Close the process gas source valve.
- Close valve HPI.
- Open valve HPV to reduce the pressure.
- Close valve HPV.
- Disconnect the process gas source connection.
- Mount the sealing nut on the gas source valve and protective cap on the process gas source.
- Identify, secure and remove the empty process gas source.
Connecting the new process gas source:
- Provide new process gas source, position in front of the bracket and secure using the safety chain.
- Remove and retain the protective cap and screw plug.
- Check the port thread and sealing; a new sealing must be used each time the gas source is exchanged.
- Screw the process gas connection onto the gas source valve by hand and tighten it gastight with a spanner.
- Open the process gas source valve, build up pressure, and close it again. Check using leak test spray whether the process gas port is leak-tight.
- Open valve HPV to reduce the pressure.
- Close valve HPV.
- Open the process gas source valve to build up the pressure with purge gas (process gas).
- Wait until the pressure has been built up and close the process gas source valve again.
- Open valve HPV to build up the pressure and then close it again.
Repeat steps 8 to 10 depending on the gas type at least 10 times. - Open the gas source valve to fill the gas connection with process gas.
- Close the process gas source valve.
- Open valve HPI. In the case of a two-sided High pressure panel with manual switchover, keep the HPI valve closed, and do not open it until the supply side has to be changed again.
- Slowly open the gas source valve.
The High pressure panel is ready for supply.