Pipe Formulas

Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

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Pipe Formulas

Pipe and Tube Equations - moment of inertia, section modulus, traverse metal area, external

pipe surface and traverse internal area - imperial units

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Online Pipe Formula Calculator

4.5 outside diameter (in)

4.026 inside diameter (in) - (default values: STD 4 inches - Carbon, Alloy and Stainless

Steel Pipes - ASME/ANSI B36.10/19

Calculate!

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)

where

I = moment of inertia (in4)

do = outside diameter (in)

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)

Torque and Power

Measured on Rotating Shafts. Precision Made Easy

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Convert Units

Temperature

0

nmlkji oC

nmlkj oF

Convert!

Length

1

nmlkji m

nmlkj km

nmlkj in

nmlkj ft

nmlkj yards

nmlkj miles

nmlkj nautical miles

Convert!

Volume

1

nmlkji m3

nmlkj liters

nmlkj in3

nmlkj ft3

nmlkj us gal

Convert!

Velocity

1

nmlkji m/s

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3/30/2013 Pipe Formulas

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where

Ai = internal pipe surface area (ft2 per ft pipe)

Transverse Internal Area

Transverse internal area can be expressed as

Aa = 0.7854 di2 (6)

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 0.049

3/8 1.178 0.110

1/2 1.571 0.196

3/4 2.356 0.442

1 3.142 0.785

1 1/4 3.927 1.227

1 1/2 4.712 1.767

2 6.283 3.142

2 1/2 7.854 4.909

3 9.425 7.069

3 1/2 11.00 9.621

4 12.57 12.57

5 15.71 19.64

6 18.85 28.27

8 25.13 50.27

10 31.42 78.54

12 37.70 113.1

15 47.12 176.7

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Related Topics

Dimensions - Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter,weight and more

Related Documents

Area Moment of Inertia - Second Moment of Inertia or Area Moment of InertiaArea Moment of Inertia Converter - Conversion of Area Moment of InertiaMoment of Section Conversions - Convert Moment of Section (Inertia) unitsPVC and CPVC Pipes - Schedule 40 & 80 - Standard dimensions and weight of PVC - Polyvinyl Chloride -and CPVC - Chlorinated Polyvinyl Chloride - pipes according ASTM D1785

Steel pipe

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nmlkj km/h

nmlkj ft/min

nmlkj ft/s

nmlkj mph

nmlkj knots

Convert!

Pressure

1

nmlkji Pa (N/m2)

nmlkj bar

nmlkj mm H2O

nmlkj kg/cm2

nmlkj psi

nmlkj inches H2O

Convert!

Flow

1

nmlkji m3/s

nmlkj m3/h

nmlkj US gpm

nmlkj cfm

Convert!

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Engineering

Standards



Section Modulus Conversions - Convert Section ModulusStainless Steel Pipes - Dimensions and Weights ANSI/ASME 36.19 - Dimensions, wall thickness andweights of stainless steel pipes according to ASME B36.19 Stainless Steel PipeSteel Pipes Dimensions - ANSI Schedule 40 - Internal and external diameters, areas, weights, volumes andnumber of threads for schedule 40 steel pipes

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