Parallel-path supply pressure calculator

The worst required parallel path determines the header pressure; losses in separate parallel branches are not added in series.

Units

P_{\text{set}} = \max\left(P_{1} + {\Delta P_{1}},\ P_{2} + {\Delta P_{2}}\right) + {\Delta P_{\text{common}}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

P_{\text{set}} = \max\left(80 + 9,\ 87 + 4\right) + 6 = 97

Symbol	Meaning	Unit
$P_{\text{set}}$	minimum compressor supply pressure	psig
$P_{1}$	first end-use minimum pressure	psig
${\Delta P_{1}}$	first branch pressure drop	psi
$P_{2}$	second end-use minimum pressure	psig
${\Delta P_{2}}$	second branch pressure drop	psi
${\Delta P_{\text{common}}}$	shared treatment pressure drop	psi

Symbol	Meaning	Unit
$P_{\text{set}}$	minimum compressor supply pressure	kPa gauge
$P_{1}$	first end-use minimum pressure	kPa gauge
${\Delta P_{1}}$	first branch pressure drop	kPa
$P_{2}$	second end-use minimum pressure	kPa gauge
${\Delta P_{2}}$	second branch pressure drop	kPa
${\Delta P_{\text{common}}}$	shared treatment pressure drop	kPa

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.