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why we are using negative range like -750 to 0 mmwc in
closed tank?and what is the reason can you explain clear?
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Answer Posted / navodit
whenever there is close tank, there is vapour which will
condensate in top taping tubing(LP taping), which will
remain there even after empty tank, that time output
pressure will be in negetive(as HP taping is empty and LP
taping has filled with condensate), as LP line is filled.
so negetive will shove 4 mA at negetive value
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