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MAWP Calculator
Calculate Maximum Allowable Working Pressure for Piping
Switch to Metric Units
Pipe Specification
Nominal Pipe Size (NPS)
Schedule
Outside Diameter (D)
in
Wall Thickness (t)
in
Operating Conditions & Material
Pipe Material
A106 Grade B (High Temp)
A53 Grade B (General)
API 5L Grade B
API 5L X52
SA-312 TP304/304L
SA-312 TP316/316L
A335 P11 (1.25Cr-0.5Mo)
A335 P22 (2.25Cr-1Mo)
A335 P91 (9Cr-1Mo-V)
Design Temperature
°F
Allowable Stress (S)
psi
Corrosion Allowance (CA)
in
Design Factors
Governing Code
ASME B31.3 - Process Piping
ASME B31.1 - Power Piping
ASME B31.4 - Liquid Pipelines
Weld Efficiency (E)
1.00 (Seamless)
0.85 (ERW)
Temp. Coeff. (Y)
Actions
📄 Export PDF
🔄 Reset Inputs
MAWP Calculation Results
Effective Thickness for MAWP
-
MAWP (at Temp)
-
MAWP (Cold)
-
Hydrotest Pressure (1.5x)
-
Pressure vs. Wall Thickness
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