ASME B31.3 allows for a 33 % surge over pressure above the design pressure. The design nominal wall thickness should take account of manufacturing wall thickness negative tolerance. If the calculated wall thickness to diameter ratio is less than 20 use the thick wall calculators.
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| CALC : Pipe : Wall Thickness 001 : ASME B31.3 Pipe Wall Thickness From OD - Low Pressure : Calculator
Description : Calculate the nominal wall thickness from the specified nominal outside diameter for low pressure pipelines.
Discussion : Use for pipelines with a DoT ratio greater than 20.
References :
Calculation Steps :
- Wall thickness
- ID and DoT ratio
Input Variables :
- D = Pipe Nominal Diameter
- E = ASME Longitudinal Weld Joint Factor
- P = Pipeline Design Gauge Pressure
- S = Allowable Hoop Stress
- Y = ASME Material Y Coefficient
- c = Pipe Total Corrosion Allowance
- ttol = Pipe Wall Thickness Negative Tolerance
Output Variables :
- ID = Pipe Nominal Inside Diameter
- dot = Pipeline Diameter Over Wall Thickness Ratio
- t = Pipe Hoop Wall Thickness
- tm = Pipe Minimum Wall Thickness
- tn = Pipe Nominal Wall Thickness
Calculation :
t = ( P D ) / ( 2 ( S E + P Y ) )
tm = t + c
tn = tm / ( 1 - ttol )
ID = D - 2 tn
dot = D / tn
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| CALC : Pipe : Wall Thickness 002 : ASME B31.3 Pipe Wall Thickness From ID - Low Pressure : Calculator
Description : Calculate the nominal wall thickness from the specified nominal inside diameter for low pressure pipelines.
Discussion : Use for pipelines with a DoT ratio greater than 20. The maximum inside diameter is the maximum allowed by the pipe specification tolerances.
References :
Calculation Steps :
- Maximum ID
- Wall thickness
- ID and DoT ratio
Input Variables :
- E = ASME Longitudinal Weld Joint Factor
- ID = Pipe Nominal Inside Diameter
- P = Pipeline Design Gauge Pressure
- S = Allowable Hoop Stress
- Y = ASME Material Y Coefficient
- c = Pipe Total Corrosion Allowance
- dtol = Pipe Outside Diameter Tolerance
- ttol = Pipe Wall Thickness Negative Tolerance
Output Variables :
- D = Pipe Nominal Diameter
- IDmax = Pipe Maximum Inside Diameter
- dot = Pipeline Diameter Over Wall Thickness Ratio
- t = Pipe Hoop Wall Thickness
- tm = Pipe Minimum Wall Thickness
- tn = Pipe Nominal Wall Thickness
Calculation :
IDmax = ID ( 1 + dtol )
t = ( P ( IDmax + 2 c ) ) / ( 2 ( S E - P ( 1 - Y ) ) )
tm = t + c
tn = tm / ( 1 - ttol )
D = ID + 2 tn
dot = D / tn
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| CALC : Pipe : Wall Thickness 003 : ASME B31.3 Pipe Wall Thickness From OD - High Pressure : Calculator
Description : Calculate the nominal wall thickness from the specified nominal outside diameter for high pressure pipelines.
Discussion : Use for pipelines with a DoT ratio less than 20. The maximum outside diameter is the maximum allowed by the pipe specification tolerances.
References :
Calculation Steps :
- Maximum OD
- Wall thickness
- ID and DoT ratio
Input Variables :
- D = Pipe Nominal Diameter
- P = Pipeline Design Gauge Pressure
- S = Allowable Hoop Stress
- ci = Pipe Internal Corrosion Allowance
- co = Pipe External Corrosion Allowance
- dtol = Pipe Outside Diameter Tolerance
- ttol = Pipe Wall Thickness Negative Tolerance
Output Variables :
- ID = Pipe Nominal Inside Diameter
- ODmax = Pipe Maximum Diameter
- c = Pipe Total Corrosion Allowance
- dot = Pipeline Diameter Over Wall Thickness Ratio
- t = Pipe Hoop Wall Thickness
- tm = Pipe Minimum Wall Thickness
- tn = Pipe Nominal Wall Thickness
Calculation :
ODmax = D ( 1 + dtol )
c = ci + co
t = ( ( ODmax - 2 co ) / 2 )( 1 - e( - 1.155 P ) / S )
tm = t + c
tn = tm / ( 1 - ttol )
ID = D - 2 tn
dot = D / tn
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| CALC : Pipe : Wall Thickness 004 : ASME B31.3 Pipe Wall Thickness From ID - High Pressure : Calculator
Description : Calculate the nominal wall thickness from the specified nominal inside diameter for high pressure pipelines.
Discussion : Use for pipelines with a DoT ratio less than 20. The maximum inside diameter is the maximum allowed by the pipe specification tolerances.
References :
Calculation Steps :
- Maximum ID
- Wall thickness
- ID and DoT ratio
Input Variables :
- ID = Pipe Nominal Inside Diameter
- P = Pipeline Design Gauge Pressure
- S = Allowable Hoop Stress
- ci = Pipe Internal Corrosion Allowance
- co = Pipe External Corrosion Allowance
- dtol = Pipe Outside Diameter Tolerance
- ttol = Pipe Wall Thickness Negative Tolerance
Output Variables :
- D = Pipe Nominal Diameter
- IDmax = Pipe Maximum Inside Diameter
- c = Pipe Total Corrosion Allowance
- dot = Pipeline Diameter Over Wall Thickness Ratio
- t = Pipe Hoop Wall Thickness
- tm = Pipe Minimum Wall Thickness
- tn = Pipe Nominal Wall Thickness
Calculation :
IDmax = ID ( 1 + dtol )
c = ci + co
t = ( ( IDmax + 2 ci ) / 2 )( e( 1.155 P ) / S - 1 )
tm = t + c
tn = tm / ( 1 - ttol )
D = ID + 2 tn
dot = D / tn
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| CALC : Pipe : Wall Thickness 005 : ASME B31.3 Pipe Wall Hoop Stress From OD - Low Pressure : Calculator
Description : Calculate the pipe wall hoop stress from the specified nominal outside diameter for low pressure pipelines.
Discussion : The hoop wall thickness is equal to the the nominal wall thickness minus the corrosion allowance and wall thickness tolerance.
References :
Calculation Steps :
- Hoop wall thickness
- Hoop stress
Input Variables :
- D = Pipe Nominal Diameter
- E = ASME Longitudinal Weld Joint Factor
- P = Pipeline Design Gauge Pressure
- Y = ASME Material Y Coefficient
- c = Pipe Total Corrosion Allowance
- tn = Pipe Nominal Wall Thickness
- ttol = Pipe Wall Thickness Negative Tolerance
Output Variables :
- S = Pipeline Hoop Stress
- t = Pipe Hoop Wall Thickness
Calculation :
t = tn ( 1 - ttol ) - c
S = ( ( P D ) / ( 2 t ) - P Y ) / E
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| CALC : Pipe : Wall Thickness 006 : ASME B31.3 Pipe Wall Hoop Stress From ID - Low Pressure : Calculator
Description : Calculate the pipe wall hoop stress from the specified nominal inside diameter for low pressure pipelines.
Discussion : The hoop wall thickness is equal to the the nominal wall thickness minus the corrosion allowance and wall thickness tolerance. The maximum inside diameter is the maximum allowed by the pipe specification.
References :
Calculation Steps :
- Maximum ID
- Hoop wall thickness
- Hoop stress
Input Variables :
- E = ASME Longitudinal Weld Joint Factor
- ID = Pipe Nominal Inside Diameter
- P = Pipeline Design Gauge Pressure
- Y = ASME Material Y Coefficient
- c = Pipe Total Corrosion Allowance
- dtol = Pipe Outside Diameter Tolerance
- tn = Pipe Nominal Wall Thickness
- ttol = Pipe Wall Thickness Negative Tolerance
Output Variables :
- IDmax = Pipe Maximum Inside Diameter
- S = Pipeline Hoop Stress
- t = Pipe Hoop Wall Thickness
Calculation :
IDmax = ID ( 1 + dtol )
t = tn ( 1 - ttol ) - c
S = ( ( P ( IDmax + 2 c ) ) / ( 2 t ) + P ( 1 - Y ) ) / E
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| CALC : Pipe : Wall Thickness 007 : ASME B31.3 Pipe Wall Hoop Stress From OD - High Pressure : Calculator
Description : Calculate the pipe wall hoop stress from the specified nominal outside diameter for high pressure pipelines.
Discussion : The maximum outside diameter is the maximum allowed by the pipe specification. The hoop wall thickness is equal to the the nominal wall thickness minus the corrosion allowance and wall thickness tolerance.
References :
Calculation Steps :
- Maximum OD
- Hoop wall thickness
- Hoop stress
Input Variables :
- D = Pipe Nominal Diameter
- P = Pipeline Design Gauge Pressure
- ci = Pipe Internal Corrosion Allowance
- co = Pipe External Corrosion Allowance
- dtol = Pipe Outside Diameter Tolerance
- tn = Pipe Nominal Wall Thickness
- ttol = Pipe Wall Thickness Negative Tolerance
Output Variables :
- ODmax = Pipe Maximum Diameter
- S = Pipeline Hoop Stress
- tm = Pipe Minimum Wall Thickness
Calculation :
ODmax = D ( 1 + dtol )
tm = tn ( 1 - ttol )
S = ( 1.155 P ) / log( ( ODmax - 2 co ) / ( ODmax - 2 ( tm - ci ) ) )
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| CALC : Pipe : Wall Thickness 008 : ASME B31.3 Pipe Wall Hoop Stress From ID - High Pressure : Calculator
Description : Calculate the pipe wall hoop stress from the specified nominal inside diameter for high pressure pipelines.
Discussion : The maximum inside diameter is the maximum allowed by the pipe specification. The hoop wall thickness is equal to the the nominal wall thickness minus the corrosion allowance and wall thickness tolerance.
References :
Calculation Steps :
- Maximum ID
- Hoop wall thickness
- Hoop stress
Input Variables :
- ID = Pipe Nominal Inside Diameter
- P = Pipeline Design Gauge Pressure
- ci = Pipe Internal Corrosion Allowance
- co = Pipe External Corrosion Allowance
- dtol = Pipe Outside Diameter Tolerance
- tn = Pipe Nominal Wall Thickness
- ttol = Pipe Wall Thickness Negative Tolerance
Output Variables :
- IDmax = Pipe Maximum Inside Diameter
- S = Pipeline Hoop Stress
- tm = Pipe Minimum Wall Thickness
Calculation :
IDmax = ID ( 1 + dtol )
tm = tn ( 1 - ttol )
S = ( 1.155 P ) / log( ( IDmax + 2 ( tm - co ) ) / ( IDmax + 2 ci ) )
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| CALC : Pipe : Wall Thickness 009 : ASME B31.3 Pipe Design Pressure From OD - High Pressure : Calculator
Description : Calculate the pipe internal design pressure from the specified nominal outside diameter for high pressure pipelines.
Discussion : The maximum outside diameter is the maximum allowed by the pipe specification. The hoop wall thickness is equal to the the nominal wall thickness minus the corrosion allowance and wall thickness tolerance.
References :
Calculation Steps :
- Maximum OD
- Hoop wall thickness
- Hoop stress
Input Variables :
- D = Pipe Nominal Diameter
- S = Allowable Hoop Stress
- ci = Pipe Internal Corrosion Allowance
- co = Pipe External Corrosion Allowance
- dtol = Pipe Outside Diameter Tolerance
- tn = Pipe Nominal Wall Thickness
- ttol = Pipe Wall Thickness Negative Tolerance
Output Variables :
- ODmax = Pipe Maximum Diameter
- P = Pipeline Design Gauge Pressure
- tm = Pipe Minimum Wall Thickness
Calculation :
ODmax = D ( 1 + dtol )
tm = tn ( 1 - ttol )
P = S / 1.155 log( ( ODmax - 2 co ) / ( ODmax - 2 ( tm - ci ) ) )
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| CALC : Pipe : Wall Thickness 010 : ASME B31.3 Pipe Design Pressure From ID - High Pressure : Calculator
Description : Calculate the pipe internal design pressure from the specified nominal inside diameter for high pressure pipelines.
Discussion : The maximum inside diameter is the maximum allowed by the pipe specification. The hoop wall thickness is equal to the the nominal wall thickness minus the corrosion allowance and wall thickness tolerance.
References :
Calculation Steps :
- Maximum ID
- Hoop wall thickness
- Hoop stress
Input Variables :
- ID = Pipe Nominal Inside Diameter
- S = Allowable Hoop Stress
- ci = Pipe Internal Corrosion Allowance
- co = Pipe External Corrosion Allowance
- dtol = Pipe Outside Diameter Tolerance
- tn = Pipe Nominal Wall Thickness
- ttol = Pipe Wall Thickness Negative Tolerance
Output Variables :
- IDmax = Pipe Maximum Inside Diameter
- P = Pipeline Design Gauge Pressure
- tm = Pipe Minimum Wall Thickness
Calculation :
IDmax = ID ( 1 + dtol )
tm = tn ( 1 - ttol )
P = S / 1.155 log( ( IDmax + 2 ( tm - co ) ) / ( IDmax + 2 ci ) )
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