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Pipe FormulasPipe and Tube Equations - moment of inertia, section modulus, traverse metal area, externalpipe surface and traverse internal area - imperial units
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Online Pipe Formula Calculator
outside diameter (in)
inside diameter (in) - (default values: STD 4 inches - Carbon, Alloy and StainlessSteel Pipes - ASME/ANSI B36.10/19
The calculator is based on the piping formulas and equations below:
Moment of Inertia
Moment of inertia can be expressed as
I = 0.0491 (do4 - di
4) (1)
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Pipe Formulas http://www.engineeringtoolbox.com/pipe-formulas-d_1335.html
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di = inside diameter (in)
Section Modulus
Section modulus can be expressed as
Z = 0.0982 (do4 - di
4) / do (2)
where
Z = section modulus (in3)
Transverse Metal Area
Transverse metal area can be expressed as
Am = π (do2 - di
2) / 4 (3)
where
Am = transverse metal area (in2)
External Pipe Surface
External pipe or tube surface per ft of length can be expressed as
Ao = π do / 12 (4)
where
Ao = external pipe surface area (ft2 per ft pipe)
Internal Pipe Surface
Internal pipe or tube surface per ft of length can be expressed as
Ai = π di / 12 (5)
where
Ai = internal pipe surface area (ft2 per ft pipe)
Convert UnitsTemperature
oC
oF
Length
m
km
in
ft
yards
miles
nautical miles
Volume
m3
liters
in3
ft3
us gal
Velocity
m/s
km/h
ft/min
ft/s
► ASME Pipe► Calculation► Steel Tube
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Pipe Formulas http://www.engineeringtoolbox.com/pipe-formulas-d_1335.html
2 of 5 10/6/2013 3:20 PM
where
Aa = transverse internal area (in2)
Circumference External
External circumference can be expressed as
Ce = π do (7)
where
Ce = external circumference (in)
Circumference Internal
Internal circumference can be expressed as
Ci = π di (8)
where
Ci = internal circumference (in)
Estimating Pipe Circumference and Section Area
Nominal Pipe Size
(in)
Circumference
(in)
Section Area
(sq.in.)
1/4 0.785 0.0493/8 1.178 0.1101/2 1.571 0.1963/4 2.356 0.4421 3.142 0.785
1 1/4 3.927 1.2271 1/2 4.712 1.767
2 6.283 3.1422 1/2 7 854 4 909
Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O
Flow
m3/s
m3/h
US gpm
cfm
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Pipe Formulas http://www.engineeringtoolbox.com/pipe-formulas-d_1335.html
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