What is the nominal pressure, working pressure and design pressure of steel pipe?

The nominal pressure,working pressure and design pressure of steel pipe are different,read this article you will know the different between them.

What is nominal pressure PN (MPa)?

A reference value relating to the pressure-bearing capacity of a ductwork component is a given design pressure relating to the mechanical strength of the ductwork component.Nominal pressure is usually expressed as PN.

(1) nominal pressure — the compressive strength of the product at the reference temperature, expressed by PN, unit:MPa.

(2) reference temperature: the reference temperature varies with the material.For example, the reference temperature of steel is 250 ° c.

(3) nominal pressure 1.0mpa, denoted as: PN 1.0mpa

What is work stress Pt?

It refers to the maximum pressure stipulated according to the highest operating temperature at all levels of the pipeline conveying medium for the operation safety of the pipeline system.Working pressure is generally expressed as Pt.

ASTM A312 TP316L seamless steel pipes

What design pressure Pe?

It refers to the maximum instantaneous pressure of the water supply pipeline system acting on the inner wall of the pipe.Generally, the sum of working pressure and residual water hammer pressure is used.Design pressure is generally expressed as Pe.

What is test pressure Ps?

The pressure at which a pipe, vessel, or equipment is to be tested for compressive strength and air tightness.The test pressure is usually represented by Ps.

ASME B16.9 ASTM A234 WPB 45 degree 90 degree long radius elbows

The relationship between PN, Ptand Pe

The nominal pressure of pressure vessel flange is generally divided into 7 grades, namely 0.25, 0.60, 1.00, 1.60, 2.50, 4.00 and 6.40MPa.

Pe =1.5× Pt.

The Pt is obtained from the hydraulic calculation of the pipe network.1MPa = 10bar = 10.2kg/cm2=100N/cm2

Ps >PN > Pe > Pt

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