Reading flow on recording charts

[kochichiro]

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[ali]

What I’ve wrote before applies to linear charts, to calculate actual pressure differential on square root charts you need to use following equation:

Actual pressure differential = ((chart reading/10)^2)*meter range

For your example it would be: ((5.8/10)^2)*100 in. of water = 33.64 in. of water or 1.215 psia

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very very tahnks , it is very help for me and ask all my questions