Closed-Loop Pressure Analysis

Compare pressure profiles using component losses and expansion tank limits.

Loading Python…

Components in flow order

The tank anchors the loop; the last component returns to it. One tank and one pump are required and cannot be deleted. Their pressure drops are fixed at zero. Move other components using the keyboard-accessible arrows.

Component names, pressure drops, and flow order
Order	Type	Name	Drop (psi)	Actions

New component type New component name

Pipe Segments

Pipe dimensions, flow, friction, velocity and pressure losses
From → To	Length (ft)	Friction (psi/100 ft)	Inside Ø (in)	Flow (GPM)	Velocity (ft/s)	Loss (psi)

Charts

Minimum tank pressure (psig) Maximum tank pressure (psig) Selected inlet limit (psig) Minimum suction pressure threshold (psig) Limiting component inlet Pipe loss method

Required pump differential —

Minimum tank pressure

Waiting for valid inputs.

Maximum tank pressure

Waiting for valid inputs.

Suction pathDischarge pathSelected inlet limitSuction thresholdSelected inlet pressure

Y minimum (psig) Y maximum (psig) Y tick interval (psi) X tick interval (ft)

Analysis will run when Python is ready.

Pressure profiles

Model assumptions & engineering use

Pump suction pressure is not NPSH available. The minimum suction pressure threshold is a gauge-pressure check only. Real NPSH evaluation requires absolute pressure, vapor pressure at fluid temperature, fluid density, elevation / datum, velocity head, and the pump manufacturer's NPSH requirement.

Preliminary analysis only. Verify system ratings and assumptions before design use. Inputs remain in this tab only; reloading restores defaults. The Python source is inline to support opening this page from disk; the runtime still requires network access.