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ASME B31.5 Refrigeration Piping Hoop Stress

Calculate ASME B31.5 refrigeration piping hoop stress from internal pressure. Use the allowable stress calculators to calculate the allowable stress from the design temperature.

The hoop stress can be calculated for either the minimum wall thickness (nominal wall thickness minus fabrication allowance), or the pressure design wall thickness (minimum wall thickness minus the corrosion allowance). For operation the hoop stress should be ≤ the design stress. For pressure tests, the hoop stress should be ≤ 100% of yield stress for hydrotest, or ≤ 90% of yield strss for pneumatic tests. For combined internal and external pressure use the pressure difference in the calculations. Use the workbook ASME B31.5 data tables to look up allowable stress data.

Reference : ANSI/ASME B31.5 : Refrigeration Piping And Heat Transfer Components (2013)

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CALCULATOR : ASME B31.5 Section 504.1 Pipe Wall Hoop Stress [FREE]   ±

Calculate hoop stress from internal pressure (ASME B31.5 section 504.1).

The minimum wall thickness may be used for uncorroded pipe, or where the minimum wall thickness has been measured (nominal wall thickness minus fabrication allowance). The pressure design wall thickness should be used for corroded pipe (minimum wall thickness minus corrosion allowance).

Tool Input

  • schdtype : Pipe 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
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • yfactype : Y Factor Type
    • Yu : User Defined Y Coefficient
  • walltype : Hoop Stress Wall Thickness Type
  • c : Corrosion Allowance
  • P : Design Pressure
  • S : Maximum Allowable Stress Table 502.3.1

Tool Output

  • D : Pipe Outside Diameter
  • D/tn : Pipe Diameter Over Nominal Wall Thickness Ratio
  • Sh : Hoop Stress
  • Sh/S : Hoop Stress Over Allowable Stress Ratio (≤ 1)
  • Y : Y Factor
  • d : Pipe Inside Diameter
  • t : Pressure Containment Wall Thickness
  • t* : Wall Thickness For Hoop Stress Calculation
  • tf : Wall Thickness Fabrication Allowance
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness

CALCULATOR : ASME B31.5 Section 504.1 Pipe Schedule Diameter And Wall Thickness [FREE]   ±

Calculate ASME B31.5 pipe diameter, minimum wall thickness and pressure design thickness from pipe schedule or user defined diameter and wall thickness (ASME B31.5 section 504.1).

Select the pipe schedule (NPS or ISO), 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 : ASME B31.5 Pipe Hoop Stress From Operating Pressure (General) [FREE]   ±

Calculate ASME B31.5 general pipe hoop stress from operating pressure, diameter, wall thickness, wall thickness tolerance and design stress.

For ASME B31.5 pipe use the Barlows equation with ASME Y factor option. Wall thickness tolerance can be defined by either a fraction tolerance, or an allowance tolerance. All tolerances should be positive. The corrosion allowance should include mechanical allowance (eg threads), erosion allowance and any other allowances. External pressure should be ignored (use the no external pressure option).

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
  • hooptype : Hoop Stress Wall Thickness Type
  • tc : Corrosion Allowance
  • Pi : Internal Pressure

Tool Output

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

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