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ASME B31.3 Process Piping Minimum Temperature For Impact Testing

Calculate ASME B31.3 process 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 323.2.2A (curves A, B, C and D).

If the maximum stress is less than the design stress, the impact testing temperature can be reduced according to figure 323.2.2B using the stress ratio. The stress ratio is the maximum of hoop stress over design stress, combined stress over design stress, or operating pressure over pressure rating for pressure rated components. The reduction in impact testing temperature from stress ratio is valid for minimum temperatures listed in table A-1, and for minimum temnperatures calculated from a letter designation (curves A, B, C or D). Use the workbook ASME B31.3 data tables to look up minimum temperature and letter designation data.

Reference : ANSI/ASME B31.3 : Process Piping (2018)

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CALCULATOR : ASME B31.3 Section 304.1 Pipe Wall Hoop Stress (Low Pressure Steel Piping) [PLUS]   ±

Calculate hoop stress from internal pressure for low pressure steel pipe (ASME B31.3 section 304.1).

The minimum wall thickness can 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). The maximum allowable diameter should be used.

Note : The choice of high pressure versus low pressure service is at the discretion of the owner (section FK300). The ASME B16.5 Class 2500 pressure temperature rating for the material group is often used as a criteria.

Tool Input

  • 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 Fabrication Tolerance Type
    • xfu : User Defined Negative Wall Thickness Fraction
    • tfu : User Defined Negative Wall Thickness Allowance
  • syutype : Stress Schedule Type (100 F)
  • mattype : Basic Allowable Stress Type (100 F)
    • Su : User Defined Basic Allowable Stress
  • efactype : Quality Factor Type
    • Eu : User Defined Quality Factor
  • wfactype : Weld Factor Type
    • Wu : User Defined W Factor
    • Tcr : User Defined Creep Onset Temperature
  • yfactype : Y Factor Type
    • Yu : User Defined Y Coefficient
  • walltype : Hoop Stress Wall Thickness Type
  • c : Corrosion Allowance
  • T : Design Temperature
  • P : Design Pressure

Tool Output

  • E : Quality Factor
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • OD/tn : Diameter Over Wall Thickness Ratio
  • S : Basic Allowable Stress Table A-1
  • SEW : Design Stress
  • Sh : Hoop Stress
  • Sh/SEW : Hoop Stress Over Design Stress Ratio (≤ 1)
  • W : Weld Joint Reduction Factor
  • Y : Y Factor
  • t* : Wall Thickness For Hoop Stress Calculation
  • tf : Wall Thickness Fabrication Allowance
  • th : Pressure Containment Wall Thickness
  • tm : Minimum Wall Thickness
  • tn : Nominal Wall Thickness

CALCULATOR : ASME B31.3 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 B31.3 section 323.2). The values are interpolated from table 323.2.2A. The temperature values from table 323.2.2A vary slightly from the values in figure 323.2.2A. The curves A, B, C and D correspond to the minimum temperature designation from Table A-1.

The stress ratio reduction is taken from figure 323.2.2B. The stress ratio is the maximum of

  • The hoop stress over the basic allowable stress using the pressure containment wall thickness (nominal wall thickness minus fabrication allowance and corrosion allowance)
  • The operating pressure over the pressure rating (for pressure rated components)
  • The combined stress over the basic allowable stress using the nominal wall thickness.

Tool Input

  • tmintype : ASME B31.3 Table 323.2.2A 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 B31.3 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 B31.3 section 323.2 and figure 323.2.2B).

The stress ratio is the maximum of

  • The hoop stress over the basic allowable stress using the pressure containment wall thickness (nominal wall thickness minus fabrication allowance and corrosion allowance)
  • The operating pressure over the pressure rating (for pressure rated components)
  • The combined stress over the basic allowable stress (nominal wall thickness)

The reduction in impact testing temperature is valid for materials in table A-1 with a listed minimum temperature, and materials with a minimum temperature letter designation (curves A, B, C and D).

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
CALCULATOR : Pipeline Combined Stress Check [PLUS]   ±

Calculate axial load, combined stress, hoop stress, longitudinal stress, bending stress and torsion stress for onshore and offshore pipelines.

The axial load is calculated using the thick wall formula (API RP 1111 and DNVGL ST F101). Loads are positive in tension, and negative in compression. The external pressure is assumed constant for installation and operation (submerged pipeline). The internal pressure is assumed zero for installation.

The combined stress may be calculated using either Tresca's or Von Mises' formula. Generally, the combined stress should be less than or equal to 90% of yield. The stress check can be calculated for either the nominal wall thickness, or the corroded wall thickness (nominal wall thickness minus corrosion allowance).

Tool Input

  • pletype : External Pressure Type
    • Peu : User Defined External Pressure
  • syutype : Stress Table Type
  • mattype : Yield Stress Type
    • SMYSu : User Defined Specified Minimum Yield Stress
  • 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
  • corrtype : Pipe Wall Corrosion Type
  • modptype : Pipe Material Type
    • νu : User Defined Pipe Poisson's Ratio
    • αu : User Defined Pipe Thermal Expansion Coefficient
    • Eu : User Defined Pipe Elastic Modulus
  • sectype : Pipe Section Properties Type
    • Asu : User Defined Steel Cross Section Area
    • EAαu : User Defined Pipe E x A x alpha
    • Zu : User Defined Pipe Z Modulus
  • walltype : Hoop Stress Calculation Type
    • Yu : User Defined ASME Y Factor
  • loadtype : Axial Load Type
    • Fgu : User Defined Global Axial Load
    • Fwu : User Defined Pipe Wall Axial Load
  • ifactype : Stress Factor Type
    • iiu : User Defined In Plane Bending Stress factor
    • iou : User Defined Out Of Plane Bending Stress Factor
    • itu : User Defined Torsion Shear Stress Factor
  • sbtype : Bending Stress Type
  • sttype : Torsion Shear Stress Type
  • checktype : Stress Check Type
  • momtype : Bending Stress Type
  • tc : Corrosion Allowance
  • Fd : Design Factor
  • Td : Design Temperature
  • Pi : Internal Pressure
  • Tin : Installation Temperature
  • Fin : Installation Load
  • M : Design Moment

Tool Output

  • α : Pipe Thermal Expansion Coefficient
  • ν : Pipe Poisson's Ratio
  • Ax : Pipe Cross Section Area
  • E : Pipe Elastic Modulus
  • EAα : Pipe E x A x alpha
  • Fg : Global Or External Axial Load
  • Fw : Pipe Wall Axial Load
  • ID : Pipe Inside Diameter
  • OD : Pipe Outside Diameter
  • OD/t : Pipe Diameter Over Wall Thickness Ratio
  • PΔ : Pressure Difference
  • Pe : External Pressure
  • SMYS : Specified Minimum Yield Stress
  • Sb : Bending Stress
  • Schk : Check Stress
  • Schk/Sd : Hoop Stress Over Allowable Stress Ratio
  • Sd : Design Stress
  • Sh : Hoop Stress
  • St : Torsion Stress
  • Sx : Pipe Wall Axial Stress
  • Z : Z Section Modulus
  • ii : In Plane Bending Stress Factor
  • io : Out Of Plane Bending Stress Factor
  • it : Torsion Shear Stress Factor
  • t : Stress Check Wall Thickness
  • tn : Pipe Nominal Wall Thickness

CALCULATOR : ASME B31.3 Section 320.2 Sustained Load Check [FREE]   ±

Calculate sustained stress and allowable stress (ASME B31.3 section 320.2). For branches and tees a separate check should be performed for each branch.

Tool Input

  • diamtype : Pipe Diameter Type
    • Du : User Defined Outside Diameter
    • du : User Defined Inside Diameter
  • sectype : Cross Section Type
    • Zu : User Defined Pipe Z Modulus
    • Axu : User Defined Pipe Cross Section Area
  • ifactype : Stress Factor Type
    • iiu : User Defined In Plane Stress Factor
    • iou : User Defined Out Of Plane Stress Factor
    • itu : User Defined Torsion Stress Factor
    • ixu : User Defined Axial Stress Factor
  • M : Design Moment
  • tn : Nominal Wall Thickness
  • Sh : Design Stress At Maximum Temperature
  • Fx : Pipe Wall Axial Force

Tool Output

  • Ax : Pipe Cross Section Area
  • D : Pipe Outside Diameter
  • D/tn : Pipe Diameter Over Wall Thickness Ratio
  • Rm : Pipe Mid Wall Radius
  • Sa : Allowable Stress
  • Sb : Bending Stress
  • Sl : Longitudinal Stress
  • Sl/Sa : Longitudinal Stress Over Allowable Stress Ratio (≤ 1)
  • St : Torsion Stress
  • Sx : Axial Stress
  • Z : Z Modulus
  • d : Pipe Inside Diameter
  • dm : Pipe Mid Wall Diameter
  • ii : In Plane Stress factor
  • io : Out Of Plane Stress factor
  • it : Torsion Stress factor
  • ix : Axial Stress factor
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