Exchanging the process gas source

WARNING

warning

Gas source exchange

If a gas source exchange is performed incorrectly, gas leakage and poisoning of persons may occur.

  1. The gas source exchange are to be carried out by trained specialist personnel and never unattended.
  2. A pressure test must be conducted after each gas source exchange.
  3. For each gas source exchange, a new seal suitable for the used gas is to be used.
  4. Wear the personal protective equipment prescribed in the risk assessment.

With each exchange of the gas source, check the connection for leaks. We strongly recommend replacing the sealing 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!

Changing the supply side

  1. The position of the lever indicates which side the gas is drawn from:
    Switching lever up – gas is drawn from the upper connected gas source: The outlet pressure of the pressure regulator on the left is set higher than that of the pressure regulator on the right.
    Switching lever down – gas is drawn from the lower connected gas source:
    The outlet pressure of the pressure regulator on the right is set higher than that of the pressure regulator on the left.
    Middle position - If the handle is positioned horizontally, the two pressure regulators are set to the same outlet pressure.
  2. The gas source pressure on the preselected side falls below the outlet pressure of the reserve side: the reserve side takes over the job of supplying process gas to the connected consumers without interruption.
    With single-stage switching panels, the outlet pressure falls markedly when there is an automatic switch from the preselected operational side to the reserve side. When the switching lever is operated, the reserve side is raised to the normal outlet pressure level and thus becomes the operational side. Two-stage switching panels keep the pressure very largely constant.
  3. Move the switching lever to increase the outlet pressure again on the reserve side that has now become the operational side.
  4. Change the gas source on the side that has now become the reserve side.

 

Removing the empty process gas source:

  1. Close the process gas source valve.
  2. Vent the set outlet pressure on the main supply side by pressing the changeover lever down. The gas outlet must be clearly audible. Then move the changeover lever to the opposite side to make the reserve side the main supply source.
  3. Close the LPV valve and open the VIV venting isolation valve until the pressure regulator gauge shows the value "zero". Ensure this with a visual inspection!
  4. Close VIV venting isolation valve.
  5. Disconnect the process gas source connection.
  6. Mount the sealing nut on the gas source valve and protective cap on the process gas source.
  7. Identify, secure and remove the empty process gas source.

If hoses with an integrated non-return valve are used to connect the pressure control station to the cylinder valve, step 2 can be omitted.

 

Connecting the new process gas source:

  1. Provide new process gas source, position in front of the bracket and secure using the safety chain.
  2. Remove and retain the protective cap and screw plug.
  3. Check the port thread and sealing; a new sealing must be used each time the gas source is exchanged.
  4. Screw the process gas connection onto the gas source valve by hand and tighten it gastight.
  5. 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.
  6. Open the process gas source valve.
  7. Slowly open valve LPV, and PLI if necessary.

 

The pressure control panel is ready for supply.