Formulas

IPC Fixture Pressure Requirements (Table 604.3)

IPC Table 604.3 required pressure at fixture outlets for proper operation.

Introduction

IPC Table 604.3 specifies the minimum pressure required at fixture outlets for proper operation. These values are critical for pressure analysis - the available pressure must exceed the required pressure at the most hydraulically remote fixture.

IPC Table 604.3 - Required Pressure at Fixture Outlets

Fixture	Type	Flow Rate (GPM)	Required Pressure (psi)
Water closet	Blow out, flushometer valve	25	45
Water closet	Siphonic, flushometer valve	25	35
Water closet	Tank type	3	20
Urinal	Flushometer valve	12	25
Urinal	Tank type	3	20
Shower	Thermostatic / balanced	3	20
Bathtub	Thermostatic / balanced	4	20
Lavatory	Faucet	2	8
Sink	Faucet	3	8
Service sink	Faucet	3	8
Kitchen sink	Faucet	3	8
Drinking fountain	Faucet	0.75	8
Hose bibb	Faucet	5	8

Notes

• Flushometer valve fixtures require significantly higher pressures (35-45 psi) than tank-type fixtures (20 psi).
• These pressures must be available AT the fixture outlet, not at the building entrance.
• Pressure analysis adds static head, friction losses, and meter losses to these values.
• Plumbing Booster uses these values automatically in IPC pressure analysis.

Pressure Analysis Methodology

Pressure analysis determines whether the available municipal supply pressure is sufficient to deliver adequate pressure at every fixture. Here is how Plumbing Booster performs this analysis.

Booster Pump Sizing Guide

Booster pump sizing starts with pressure deficiency analysis and ends with a pump duty point. Plumbing Booster supports six pump types with computed friction mode and source-linked duty points.

IPC Pipe Sizing Guide

Step-by-step explanation of the IPC table-based pipe sizing method, from WSFU summation through flow conversion to final pipe selection using Table E104.1.