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Notes to the Tables of Allowable Working Pressures
- This data is intended to provide a general guide. It must not to be relied upon in the absence of competent professional advice.
- These allowable pressures were calculated by the formula given in AS 4041-2006 "Pressure Piping", clause 3.14.3. Other design codes may give different allowable pressures. The original specifications must be consulted for full details.
- These calculations assume Piping Class 1 so only apply if this level of piping construction quality has been achieved.
- Calculations are for seamless pipe to specification ASTM A312/A312M. An additional weld joint efficiency factor of 85% must be allowed for standard welded pipe, and allowance made for corrosion or wear loss if appropriate.
- Grade 304 and 316 design pressures are only valid at temperatures above 538°C if carbon content is 0.04% or higher.
How to Calculate the Working Pressure of SS Pipes?
The allowable working pressure of stainless steel pipe is generally calculated using Barlow's Formula. This formula relates the internal pressure of a pipe to its physical dimensions and the strength of the material:
P = 2St/D
- P: Internal Pressure (PSI or Bar)
- S: Allowable Stress value of the material (e.g., for TP304/TP316 at room temperature)
- t: Nominal Wall Thickness
- D: Outside Diameter (OD)
Note: When designing your piping system, it is crucial to consider a Safety Factor and Weld Efficiency (E). For seamless pipes, E=1.0, while for welded pipes, it typically ranges from 0.80 to 0.85.
Critical Factors Affecting Real-World Pressure Ratings
The tables provided are based on ideal conditions. In practical engineering, you must adjust for:
- Temperature Derating: For every 50 degree increase, the allowable pressure drops significantly. Consult our Temperature Derating Factor Table for precise calculations.
- Corrosion Allowance: If the medium is corrosive, an additional thickness should be added to the calculated minimum wall thickness.
- Vibration and Shock: Systems subject to water hammer or mechanical vibration require a higher safety factor.
Stainless Steel Grade TP304 Pipes - ASTM A312, Seamless
- Allowable Working Pressure At Temperature
Stainless Steel Grade TP316 Pipes - ASTM A312, Seamless
- Allowable Working Pressure At Temperature
