Calculation Input

psig
psig
%
°F
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lb/hr

Correction Factors

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Calculated Orifice

Type of flow:
k-value coefficient (C):
Coefficient subcritical flow (F2):
Calculated orifice:
Recommended orifice:
Orifice TAG (acc API-RP-526):

VAPOR / GAS


Check for subcritical flow using the following formula



If critcal flow:

 

Calculated C with



If subcritical flow:

 

Calculated F2 with


STEAM RELIEF


 

Calculated Kn with


Where:
P = internal design pressure, psig.
do = pipe outside diameter, inches.
S = minimum yield strength of pipe, psi.
F = design factor
E = longitudinal weld joint factor (see ANSI B31.3);
   = 1.00 for seamless, electric resistance weld, flash weld
   = 0.80 for furnace lap and electric fusion welded pipe
   = 0.60 for furnace butt-welded pipe.
T = Temperature derating factor