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ASME B31.5 Refrigeration Piping Minimum Temperature For Impact Testing

Calculate ASME B31.5 refrigeration piping minimum temperature for impact testing from wall thickness and material type.

For carbon steel materials with a minimum temperature letter designation, the minimum temperature for testing can be calculated according to table 523.2.2 (curves A, B and C).

If the maximum stress is less than the design stress, the impact testing temperature can be reduced according to figure 523.2.2 using the stress ratio (the ratio of design tensile streess over allowable stress). Use the hoop stress calculator to calculate the hoop tensile stress. Use the flexibility calculators to calculate longitudinal tensile stress. Use the workbook ASME B31.5 data tables to look up minimum temperature and letter designation 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 Section 323.2 Minimum Temperature Without Impact Testing For Carbon Steel Materials From Letter Designation [FREE]   ±

Calculate the minimum design temperature without impact testing for carbon steel pipes and tubes with a minimum temperature letter designation (ASME B31.5 section 523.2). The values are interpolated from table 523.2.2. The curves A, B and C correspond to the minimum temperature designation from Table 503.2.1.

The stress ratio reduction is taken from figure 523.2.2. The stress ratio is the design tensile stress over the allowable stress.

Tool Input

  • tmintype : ASME B31.5 Table 523.2.2 Curve
    • Tminu : User Defined Minimum Temperature Before Stress Ratio Reduction
  • sostype : Stress Ratio Reduction Type
  • Tn : Nominal Wall Thickness
  • S/Sa : Stress Over Allowable Stress Ratio

Tool Output

  • ΔT : Reduction In Minimum Temperature From Stress Ratio
  • Tmin : Minimum Temperature Before Stress Ratio Reduction
  • Tmin* : Minimum Temperature With Stress Ratio Reduction
CALCULATOR : ASME B31.5 Section 323.2 Reduction In Minimum Temperature Without Impact Testing From Stress Ratio [FREE]   ±

Calculate the reduction in minimum temperature without impact testing from the stress ratio (ASME B31.5 section 523.2 and figure 523.2.2).

The stress ratio reduction is taken from figure 523.2.2. The stress ratio is the design tensile stress over the allowable stress. The reduction in impact testing temperature is valid for materials in table 502.3.1 with a listed minimum temperature, and materials with a minimum temperature letter designation (curves A, B and C).

Tool Input

  • S/Sa : Stress Over Allowable Stress Ratio
  • Tmin : Minimum Temperature Before Stress Ratio Reduction

Tool Output

  • ΔT : Reduction In Minimum Temperature From Stress Ratio
  • Tmin* : Minimum Temperature With Stress Ratio Reduction
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