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Pipeline Maximum Allowable Design Pressure

Calculate pipeline maximum allowable design pressure from allowable stress and wall thickness.

The design factor should include all relevant factors (eg quality factor E and stress factor F etc). The allowable pressure is calculated so that the hoop stress equals the allowable stress. The allowable internal pressure includes the effect of external pressure. For onshore (dry) pipelines the external pressure should be set to zero. Use the Result Table option to display the results for the selected pipe diameter table.

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CALCULATOR : Pipeline Yield Stress And Tensile Stress [FREE]   ±

Calculate pipeline SMYS, SMTS, SMTS over SMYS ratio and SMYS over SMTS ratio from pipe stress tables.

Select one of the API, ASME or DNV stress table options. The API stress values are taken from API 5L tables 6 and 7 (note the API 5L X series is superseded). The ASME stress values are taken from ASME B31.3 process piping table A-1M. The DNV stress values are taken from DNVGL ST F101 submarine pipelines, tables 7-5 and 7-11.

Use the Result Table option to display the stress values for the selected stress table (click the Result Table button, and then click the make table button).

Tool Input

  • syutype : Stress Table Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
    • SMTSu : User Defined Specified Minimum Tensile Stress

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

CALCULATOR : Pipeline Allowable Stress From Tensile Stress [FREE]   ±

Calculate pipeline SMYS, SMTS and allowable stress SE and SEF from pipe stress tables.

The allowable stress is calculated by multiplying the SMYS times the quality factor E and the design factor F. The quality factor is used to account for casting quality, or longitudinal weld joint quality. The design factor is used to account for design risks (for pipelines requiring a high level of safety use a low design factor). Temperature derating is not included.

Select one of the API, ASME or DNV stress table options. The API stress values are taken from API 5L tables 6 and 7 (note the API 5L X series is superseded). The ASME stress values are taken from ASME B31.3 process piping table A-1M. The DNV stress values are taken from DNVGL ST F101 submarine pipelines, tables 7-5 and 7-11.

Use the Result Table option to display the stress values for the selected stress table (click the Result Table button, and then click the make table button).

Tool Input

  • syutype : Stress Table Type
  • mattype : Material Type
    • SMYSu : User Defined Specified Minimum Yield Stress
    • SMTSu : User Defined Specified Minimum Tensile Stress
  • efactype : Quality Factor Type
    • Eu : User Defined Quality Factor
  • ffactype : Design Factor Type
    • Fu : User Defined Design Factor

Tool Output

  • E : Quality Factor Or Joint Factor
  • EF : Design Factor (E x F)
  • F : Stress Factor
  • SEF : Allowable Stress
  • SMTS : Specified Minimum Tensile Stress
  • SMYS : Specified Minimum Yield Stress

CALCULATOR : Pipeline Design Pressure [FREE]   ±

Calculate pipeline design delta pressure and design internal pressure (pipe schedule diameter, wall thickness, wall thickness tolerance and design stress).

The design stress is calculated by multiplying the SMYS times the design factor. The design factor should include the stress factor, weld quality factor, temperature derating factor, and any other relevant factors.

The hoop stress equals the design stress at the design pressure. The design internal pressure includes the effect of external pressure (relevant for submerged pipelines only). For dry pipelines the external pressure should be set to zero. Wall thickness negative tolerance can be defined by either the tolerance schedule, a fraction tolerance, or an allowance tolerance (enter as positive values). For ASME B31.4 liquid pipelines, ASME B31.8 gas pipelines and AS 2885 (oil and gas pipelines) et al use the zero wall thickness tolerance option (the fabrication allowance is accounted for in the design factor).

Use the Result Table option to display the design pressure versus either wall thickness or material type (click the Result Table button, and then click the make table button).

Tool Input

  • pletype : External Pressure Type
    • Peu : User Defined 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
  • ttoltype : Wall Thickness Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • syutype : Stress Table Type
  • mattype : Yield Stress Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • sdtype : Design Stress Type (F x SMYS)
    • Fu : User Defined Design Factor
    • Sdu : User Defined Design Stress
  • walltype : Hoop Stress Calculation Type
    • Yu : User Defined ASME Y Factor
  • tc : Corrosion Allowance

Tool Output

  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • Pd : Design Internal Pressure
  • PdΔ : Design Delta Pressure
  • Pe : External Pressure
  • SMYS : Specified Minimum Yield Stress
  • Sd : Design Stress
  • tf : Fabrication Allowance
  • tfx : Fabrication Fraction
  • th : Hoop Stress Thickness (Pressure Containment)
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness

CALCULATOR : Pipeline Design Pressure (General) [FREE]   ±

Calculate pipeline design delta pressure and design internal pressure from user defined diameter, wall thickness, wall thickness tolerance and design stress.

The hoop stress equals the design stress at the design pressure. The allowable internal pressure includes the effect of external pressure (relevant for submerged pipelines only). For dry pipelines the external pressure should be set to zero. Wall thickness negative tolerance can be defined by either the tolerance schedule, a fraction tolerance, or an allowance tolerance. For ASME B31.4 liquid pipelines, ASME B31.8 gas pipelines and AS 2885 (oil and gas pipelines) et al use the zero wall thickness tolerance option (the fabrication allowance is accounted for in the design factor).

The design stress can be calculated by multiplying the SMYS times the design factor. The design factor should include the stress factor, weld quality factor, temperature derating factor, and any other relevant factors.

Tool Input

  • pletype : External Pressure Type
    • Peu : User Defined External Pressure
  • ttoltype : Wall Thickness Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • walltype : Hoop Stress Calculation Type
    • Yu : User Defined ASME Y Factor
  • OD : Pipe Outside Diameter
  • tn : Nominal Wall Thickness
  • tc : Corrosion Allowance
  • Sd : Design Stress

Tool Output

  • ID : Pipe Inside Diameter
  • OD/tn : Pipe Diameter Over Wall Thickness Ratio
  • PΔ : Design Delta Pressure
  • Pe : External Pressure
  • Pi : Design Internal Pressure
  • tf : Fabrication Allowance
  • tfx : Fabrication Fraction
  • th : Hoop Stress Thickness (Pressure Containment)
  • tm : Minimum Wall Thickness

CALCULATOR : Pipeline Diameter Wall Thickness And Tolerance Schedule [FREE]   ±

Calculate pipeline diameter, pressure design wall thickness (nominal wall thickness minus fabrication allowance and corrosion allowance), and minimum wall thickness (nominal wall thickness minus fabrication allowance) from nominal wall thickness.

Select the pipe schedule (NPS or ISO etc), pipe diameter and wall thickness, or use the user defined option. Use the Result Table option to display the pipe schedule with nominal wall thickness, minimum wall thickness and pressure design wall thickness for the selected diameter.

Tool Input

  • schdtype : Schedule Type
  • diamtype : Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • ttoltype : Wall Thickness Fabrication Tolerance Type
    • txu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • c : Wall Thickness Corrosion Allowance

Tool Output

  • ID : Nominal Inside Diameter
  • OD : Nominal Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • tf : Wall Thickness Fabrication Allowance
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness
  • tp : Pressure Design Wall Thickness
  • tx : Wall Thickness Fabrication Fraction

CALCULATOR : Pipeline Diameter And Wall Thickness Schedule [FREE]   ±

Calculate pipeline diameter, pressure design wall thickness (nominal wall thickness minus corrosion allowance) from nominal wall thickness.

For ASME B31.4 (oil pipelines), ASME B31.8 (gas pipelines) and AS 2885 (oil and gas pipelines) the fabrication allowance is accounted for in the design factor. Fabrication allowance is not included when calculating the pressure design thickness.

Select the pipe schedule (NPS or ISO etc), pipe diameter and wall thickness, or use the user defined option. Use the Result Table option to display the pipe schedule with nominal wall thickness and pressure design wall thickness for the selected diameter.

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