P&F Distributors


High Pressure Flow of Natural Gas

in DriscoPlex® Pipe


1. Average ID used in all calculations. It equals the nominal OD minus 2.12 times the minimum wall thickness.

2. For flow in BTU/hr at sea level multiply flow by 1000. Heat value of Natural Gas is 1000 BTU/scf at sea level.

3. Calculations used high pressure (>1.5 psi) equation from Chapter 12, National Fuel Gas Code (2002).


Q = Flow (cubic ft per hr), D = ID (in), Cr = 0.6094 (natural gas), p1 = upstream pressure (psi),

p2 = downstream pressure (psi), L = equivalent length (ft)

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Natural Gas High Pressure 5 psi Drop 0.5 psi Outlet