### Piping Drums Headers ASME Pressure Vessel Code Equations and Calculators

**ASME Pressure Vessel Design and Engineering**

ASME SECTION I – Piping, Drums, and Headers Pressure and Wall Thickness Equations and Calculator:

The following formulae are found in ASME Section I, paragraph PG-27.2.2. The information for piping, drums, or headers may be given with either the inside I or outside D measurements.

Pressure and Wall Thickness Equations and Calculator Preview

Using the inside radius:

Pressure and Wall Thickness Equations and Calculator Preview #2

Where:

t = Minimum Design Wall Thickness (in);

P = Design Pressure (psi);

D = Tube Outside Diameter (in);

R = Tube Radius (in);

E = Tube Welding Factor (1.0 for seamless pipe; 0.85 = for welded pipe);

y = Wall Thickness Welding Factor (0.4 for 900°F & lower; 0.7 for 950°F & up);

C = Corrosion Allowance (0 for no corrosion; 0.0625 in. commonly used; 0.125 in. maximum);

S = Maximum Allowable Stress According to ASME Section II.

Example - Steam Piping:

Calculate the required minimum thickness of a seamless steam piping at a pressure of 900 psi gauge
and a temperature of 700°F. The piping is 10.77 in O.D., (10 inches nominal) plain end; the material is

SA-335 – P1, alloy steel. Allow a manufacturer’s tolerance allowance of 12.5%.

Note: Before starting calculations check the material stress table in ASME Section II, Table 1A:

SA-335 – P1 = 13,800 psi – allowable stress – Div.1. Use equation:

P = [900 psi]

D = [10.77 in]

C = 0

S = [13,800] – (SA-335 – P1 alloy steel at 700°F)

E = 1.0

y = 0.4 (Ferritic steel less than 900°F)

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