Schedule 40 & Schedule 80 Pipe

Before you begin!

For steam system to work properly, it is important to maintain reasonable velocities of liquid passing through piping. Velocity is constant for a given flow rate and independent of pipe length. Pipe diameters are selected to achieve a velocity of 5-10 feet per second. Chart versions of the data used to build this calculator are also available. Schedule 40 or Schedule 80

Pipe Schedule and Size

Choose a pipe schedule. What's this?

Schedule refers to strength of pipe. Wall thickness of pipe varies based on dimensions of pipe as defined in ASME standard 36.10.

Choose nominal pipe size.

inches

Pipe Outer Diamater (OD)

— inches

Pipe Inner Diamater (ID)

— inches

Wall thickness

— inches

Velocity and Friction Loss

Velocity and Friction Loss are derived from the the nominal pipe size chosen from Pipe Schedule and Size and pump flow rate.

Choose pump flow rate that is equal to or greater than the pump flow of your application.

gallons ⁄ min (GPM)

Velocity

— feet ⁄ second

Friction Loss

— psi ⁄ 100 feet

Velocity is over 2.75 feet/second. This is normal for saturated water or on a deaerator.
Velocity is over 5 feet/second. This is for typical applications or cold water suction.
Velocity is 7-12 feet/second. This is normal for transfer piping on a deaerator.