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European Southern Observatory
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General :
Observations :
Operations :

Nitrogen Tank Exchange

Whenever a LN2 bottle  gets empty, this procedure must be execuded  IMMEDIATELY

  • Open both valves and release the remaining pressure.
  • Remove the sealing collar and the O-ring.
  • Remove the pipe and let it to get warm.
  • Put the empty tank into the metallic storage cabinet on the access ramp located at the outside of the telescope

  • (The mechanicians will refill once a day the empty tanks).
  • Take a full tank from the storage cabinet.
  • Take a pipe and put appart the metallic tube from the sealing cap by unscrewing the knob at the top.
  • Put the O-ring on the sealing flange on the top of the tank (Make sure that it fits well into the seat).
  • put the black cap on the O-ring (Make sure that it fits well into the seat).
  • Tie the cap with the sealing collar.
  • Close both valves (at the pipe and at the cap).
  • Insert the metallic tube into the tank by the orifice on the top of the cap.
  • Tight the sealing knob at the top of the cap.
  • Check that no gas leak occurs.
  • The tank will get pressure after a few hours.
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