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API RP 1111 Pipeline Burst Pressure

Calculate API RP 1111 limit state pipeline burst pressure from wall thickness and material strength.

Burst stress is calculated from the average of the yield stress and the ultimate tensile stress.

Reference : API RP 1111 : Design, Construction, Operation, and Maintenance of Offshore Hydrocarbon Pipelines (Limit State Design) (2011)

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CALCULATOR : API RP 1111 Section 4.3.1 Pipeline Burst Pressure From Wall Thickness And Elevation [PLUS]   ±

Calculate pipe burst pressure, maximum incidental pressure. maximum test pressure and maximum design pressure from wall thickness and elevation (API RP 1111 section 4.3.1).

Burst pressure can be calculated using either equation 4, or equation 5. The maximum test pressure, maximum incidental pressure and maximum design pressure can be calculated as either the local maximum differential pressure (pressure difference across the pipe wall), the local maximum internal pressure (local maximum pressure difference + local external pressure), or the reference maximum internal pressure (local maximum pressure difference + local external pressure + delta pressure due to elevation).

Tool Input

  • pletype : Local External Pressure Type
    • Pleu : User Defined Local External Pressure
  • schdtype : Pipe Schedule Type
  • diamtype : Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • syutype : Stress Table Type
  • mattype : Yield Stress Type
    • SMYSu : User Defined Specified Minimum Yield Stress
    • SMTSu : User Defined Specified Minimum Tensile Stress
  • tfactype : Temperature Derating Type
    • ftu : User Defined Temperature Reduction Factor
  • sfactype : Stress Factor Type
    • F4u : User Defined Equation 4 Stress Factor
    • F5u : User Defined Equation 5 Stress Factor
  • walltype : Corrosion Allowance Type
  • loctype : Internal Pressure Design Factor Type
    • Fdu : User Defined Internal Pressure Design Factor
  • calctype : Burst Pressure Calculation Type
  • pmaxtype : Maximum Pressure Type
  • tc : Corrosion Allowance
  • Td : Design Temperature
  • ρi : Internal Fluid Density
  • ρe : External Fluid Density
  • Zr : Reference Elevation
  • Zl : Local Elevation
  • Zs : Surface Elevation

Tool Output

  • ΔPlr : Delta Local To Reference Pressure
  • Fd : Internal Pressure Design Factor
  • Ft : Temperature Derating Factor (ASME B31.8)
  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • Pb : Temperature Derated Burst Pressure
  • Pldx : Maximum Design Pressure
  • Ple : Local External Pressure
  • Plix : Maximum Incidental Pressure
  • Pltx : Maximum Test Pressure
  • Sb : Temperature Derated Burst Stress
  • Su : Temperature Derated Tensile Stress
  • Sy : Temperature Derated Yield Stress
  • tb : Burst Pressure Wall Thickness
  • tn : Nominal Wall Thickness
  • wd : Water Depth

CALCULATOR : API RP 1111 Section 4.3.1 Pipeline Temperature Derated Yield Stress And Tensile Stress [FREE]   ±

Calculate temperature derating factor, and derated yield stress and tensile stress from temperature (API RP 1111 section 4.3.1 and ASME B31.8 section 841.1).

Refer to Table 841.1.8-1 for the derating factors. The derating factors are valid for steel pipe upto 232 C (450 F). For temperatures above 232 C (450 F) the derating values should be used carefully (material specific test data should be used if it is available). The derating factor is assumed to be valid for yield stress and tensile stress. Use the Result Table option to display the results for the selected stress table (API, ASME or DNV). The temperature derating factor is not valid for nickel alloy, or stainless steel.

Tool Input

  • syutype : Stress Table Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
    • SMTSu : User Defined Specified Minimum Tensile Stress
  • tfactype : Temperature Derating Factor Type
    • Td : Design Temperature
    • Tu : User Defined Temperature Derating Factor

Tool Output

  • SMTS : Specified Minimum Tensile Stress
  • SMTS/SMYS : Tensile Stress Over Yield Stress Ratio
  • SMYS : Specified Minimum Yield Stress
  • SMYS/SMTS : Yield Stress Over Tensile Stress Ratio
  • Su : Derated Tensile Stress
  • Sy : Derated Yield Stress
  • T : Temperature Derating Factor
CALCULATOR : API RP 1111 Pipeline Diameter And Wall Thickness Schedule [FREE]   ±

Calculate API RP 1111 pipeline diameter and wall thickness from pipe schedule.

The pressure design thickness equals the nominal wall thickness minus the corrosion allowance. The corrosion allowance includes mechanical allowances such as threads and damage etc. Use the Result Table option display a table of pressure design wall thickness versus wall thickness for the selected diameter schedule. Fabrication tolerance is included in the design factor and is ignored.

Tool Input

  • schdtype : Line Pipe Schedule Type
  • diamtype : Line Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • c : Wall Thickness Corrosion Allowance

Tool Output

  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • tn : Nominal Wall Thickness
  • tp : Pressure Design Wall Thickness
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