
3. Guideline for each installation process
72
(5) Check that the nitrogen is passing through the unit A liquid pipe.
(6) Flushing.
① Block the end of the pipe with the insulation of your hand.
↓
② When the gas pressure becomes too great to contain remove insulation quickly. (First flush)
↓
③ Block the end of the pipe with insulation again.
↓
(Carry out second flushing)
(The nature and amount of the extraneous material inside the pipe can be checked during flushing
by placing a rag lightly over the end of the pipe. In the unlikely case that even a small quantity of
moisture is found then the inside of the pipe should be dried out thoroughly.)
Action:
① Flush the inside of the pipe with nitrogen gas. (Until such time as the moisture disappears.)
② Carry out a thorough vacuum drying operation. (See page 34)
_ Close the main valve on the nitrogen cylinder.
_ Repeat the above operation for unit B.
_ When the liquid pipe operations have been completed then do the same with the gas pipes.
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