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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 / varma
In Closed tanks vapour condensates and accumulate in LP impulse line, to eliminate this problem glycol will be filled
in LP impulse line. The positive head pressure which is created by the glycol density and the height of the LP impulse line has to be suppressed. For example LRV and URV are 0 to 750mmh2o, 750mmh20 of positive head pressure to be substrated for each value then u will get the value of LRV and URV as -750 to 0mmh2o.
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