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ASME B31.8 Gas Pipeline Maximum Allowable Operating Pressure

Calculate ASME B31.8 gas pipeline MAOP from the design pressure and the test pressure.

The design pressure is the minimum value of allowable pressure at all points on the pipeline. If the design pressure is not known, use the hoop stress calculators to calculate the design pressure. Use the goal seek option to calculate the allowable pressure at the allowable stress at all points on the pipeline. The minimum value of allowable pressure is the design pressure. Use the pressure design wall thickness for the hoop stress calculations.

The test pressure is the minimum value of the local test pressure at all points on the pipeline. If the minimum test pressure is not known (only the test pressure at the test location is known), use the test pressure calculators to calculate the local test pressure from the test pressure at the test location, at all points on the pipeline. Use the minimum value of local test pressure as the test pressure.

Reference : ANSI/ASME B31.8 : Gas Transmission And Distribution Piping Systems (2018)

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Links : ±
CALCULATOR : ASME B31.8 Section 841.3 Pipeline MAOP From Test Pressure And Design Pressure (Onshore) [FREE]   ±

Calculate onshore steel pipe maximum allowable operating pressure (MAOP) from test pressure and design pressure. The test pressure and design pressure should be the minimum values for the pipeline system and components.

For new pipelines refer to table 841.3.2-1. For existing pipelines refer to table 845.2.2-1. For existing pipelines with one or more design factors unknown (design pressure therefore unknown), refer to tables 845.2.3-1 (high pressure piping), and table 845.2.3-2 (low pressure piping). Use the Result Table option to display a table of the results for all location classes.

Tool Input

  • loctype : Pipe Location Type
  • tfactype : Test Pressure Factor Type
    • Tu : User Defined Test Pressure Factor
  • Pd : Design Pressure
  • Pt : Test Pressure

Tool Output

  • MAOP : MAOP
  • T : Test Pressure Factor
CALCULATOR : ASME B31.8 Section A847.2 Pipeline MAOP From Test Pressure And Design Pressure (Offshore) [FREE]   ±

Calculate offshore steel pipe maximum allowable operating pressure (MAOP) from test pressure and design pressure (annex A847.2). The pipeline MAOP is the minimum value calculated for the platform and riser section, for the subsea pipeline section, and for all valves, flanges, pig launchers and other components.

Tool Input

  • tfactype : Test Pressure Factor Type
    • Tu : User Defined Test Pressure Factor
  • Pd : Design Pressure
  • Pt : Test Pressure

Tool Output

  • MAOP : MAOP
  • T : Test Pressure Factor
CALCULATOR : ASME B31.8 Section 841.3 Plastic Pipe MAOP From Test Pressure And Design Pressure [FREE]   ±

Calculate plastic pipe maximum allowable operating pressure (MAOP) from test pressure and design pressure (section 845.2). The MAOP is the minimum value calculated for the piping system and components.

Tool Input

  • Pd : Design Pressure
  • Pt : Test Pressure

Tool Output

  • MAOP : MAOP
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