Calculate ASME B31.5 refrigeration piping hydrotest and pneumatic leak test pressure and hoop stress check. Use the allowable stress calculators to calculate the yield stress from the design temperature.
The test pressure should be 1.5 times the design pressure for hydrotest, or 1.1 times the design pressure for pneumatic test. Hydrotest should be used for secondary cooling piping only. Hydrotest should not be used for refrigeration piping.
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). Minimum wall thickness is recommended for new piping, or piping in as new condition. The pressure design wall thickness is recommended for corroded piping. The hoop stress should be ≤ 90% of yield for hydrotest or pneumatic tests.
For piping systems with combined internal and external pressure during operation, the test pressure should be calculated from the internal pressure only. The hoop stress should be calculated separately from the pressure difference during testing (use the hoop stress calculator). 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 538.4 Pipe Test Pressure And Hoop Stress Check [FREE] ±
Calculate test pressure and hoop stress check from operating pressure (ASME B31.5 section 538.4). For hydrotest of secondary coolant piping the test factor should be >= 1.5. For pneumatic test of refrigeration piping the test factor should be >= 1.1 and <= 1.3. The hoop stress should not exceed 90% of the yield stress at the test temperature for hydrotest, or 90% for pneumatic test. Refrigerant piping should not be pressure tested with a water medium. Dry inert gas is recommended. 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
- testtype : Test Pressure Type
- Tu : User Defined Test Pressure Factor
- Ptu : User Defined Test Pressure
- c : Corrosion Allowance
- P : Design Pressure
- Sy : Yield Stress At Test Temperature
Tool Output- D : Pipe Outside Diameter
- D/tn : Pipe Diameter Over Nominal Wall Thickness Ratio
- Pt : Test Pressure
- Pt/P : Test Pressure Over Design Pressure Ratio
- Py : Yield Pressure
- Sh : Hoop Stress [ Pa ]
- Sh/Sy : Hoop Stress Over Yield 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
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CALCULATOR : ASME B31.5 Pipe Hydrotest Liquid Volume And Dose Rate [FREE] ±
Calculate ASME B31.5 liquid volume and liquid chemical dose rate for liquid hydrotest. The dose rate can be calculated from the dose volume fraction, the dose mass fraction, the dose volume ratio, or the dose mass ratio. The average fluid density includes the dose chemical. The calculated volume does not include the effect of fluid compression or pipe expansion due to the test pressure. 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
- dosetype : Dosage Type
- Xvu : User Defined Dose Volume Fraction
- Xmu : User Defined Dose Mass Fraction
- Rvu : User Defined 200
- Rmu : User Defined 250
- voltype : Fluid Volume Type
- Vlu : User Defined Liquid Volume
- Mlu : User Defined Liquid Mass
- Vfu : User Defined Total Fluid Volume
- Mfu : User Defined Total Fluid Mass
- Lu : User Defined Pipeline Length
- ρl : Liquid Density
- ρd : Dose Chemical Density
Tool Output- ρf : Fluid Average Density
- ID : Inside Diameter
- L : Pipe Length
- Md : Dose Mass
- Mf : Total Fluid Mass
- Ml : Liquid Mass
- Rm : Dose Mass Ratio
- Rv : Dose Volume Ratio
- Vd : Dose Volume
- Vf : Total Fluid Volume
- Vl : Liquid Volume
- Xm : Dose Mass Fraction
- Xv : Dose Volume Fraction
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CALCULATOR : ASME B31.5 Pipe Leak Test Gas Volume And Dose Rate [FREE] ±
Calculate ASME B31.5 gas volume and liquid chemical dose rate for gas leak test. The dose rate can be calculated from dose volume fraction, dose mass fraction or dose gas ratio. The average fluid density includes the dose chemical. The calculated volume does not include the effect of pipe expansion due to the test pressure. 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
- dosetype : Dose Rate Type
- Xvu : User Defined Dose Volume Fraction
- Xmu : User Defined Dose Mass Fraction
- Rvu : User Defined Dose Volume Over Gas Moles Ratio
- Rmu : User Defined Dose Mass Over Gas Moles Ratio
- voltype : Fluid Volume Type
- Vgu : User Defined Gas Volume
- Mgu : User Defined Gas Mass
- Ngu : User Defined Gas Moles
- Vfu : User Defined Total Fluid Volume
- Mfu : User Defined Total Fluid Mass
- Lu : User Defined Pipeline Length
- ρd : Dose Chemical Density
- P : Fluid Pressure
- T : Fluid Temperature
- Z : Gas Compressibility Factor
- SG : Gas Specific Gravity
Tool Output- ρf : Fluid Average Density
- ρg : Gas Density (At T P)
- ID : Inside Diameter
- L : Pipe Length
- Md : Dose Mass
- Mf : Total Fluid Mass
- Mg : Gas Mass
- Ng : Gas Moles
- Rm : Dose Mass Over Gas Moles Ratio
- Rv : Dose Volume Over Gas Moles Ratio
- Vd : Dose Volume
- Vf : Total Fluid Volume
- Vg : Gas Volume
- Xm : Dose Mass Fraction
- Xv : Dose Volume Fraction
- vg : Gas Mole Volume (At T P)
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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
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CALCULATOR : ASME B31.5 Pipe Test Pressure And Hoop Stress Check (General) [FREE] ±
Calculate ASME B31.5 general pipe test pressure and hoop stress check from 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
- 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
- schdtype : Pipe Schedule Type
- diamtype : Pipe Diameter Type
- ODu : User Defined Outside Diameter
- IDu : User Defined Inside Diameter
- sdtype : Design Stress Type (F x SMYS)
- Fu : User Defined Design Factor
- Sdu : User Defined Design Stress
- walltype : Hoop Stress Wall Thickness Type
- Yu : User Defined ASME Y Factor
- hooptype : Hoop Stress Wall Thickness Type
- testtype : Test Pressure Type
- Tu : User Defined Test Factor
- Ptu : User Defined Test Pressure
- tc : Corrosion Allowance
- Pi : Operating Pressure
Tool Output- ID : Pipe Inside Diameter
- OD : Pipe Outside Diameter
- OD/tn : Pipe Diameter Over Wall Thickness Ratio
- Pe : External Pressure
- Pt : Test Pressure
- PtΔ : Test Pressure Difference
- SMYS : Specified Minimum Yield Stress
- Sd : Design Stress
- Sh : Hoop Stress
- Sh/SMYS : Hoop Stress Over Yield Stress Ratio
- T : Test Pressure Factor
- tf : Fabrication Allowance
- tfx : Fabrication Fraction
- th : Hoop Stress Thickness (Pressure Containment)
- tm : Minimum Wall Thickness
- tn : Nominal Wall Thickness
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