There are NO valves, check or zone, in the vent pipes of either the FIRE
cylinder or the IMMERSION cylinder.

My very initial mistake, 22 years ago was to omit the vent pipe on the FIRE
cylinder as I ASS-U-ME'd that the transfer pipework would allow the vent on
the IMMERSION cylinder to take care of matters. As I said earlier, I did
learn from that mistake.

Must go for a Pint. Its been a long day.

Chris.


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