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Pipe Equations

Cross Sectional inside Pipe Area

Cross-sectional inside area of a pipe can be calculated as

Ai = π (di / 2)2

= π di 2 / 4                                 (1)

where

Ai = cross-sectional inside area of pipe (m2, in2)

di = inside diameter (m, in)

Cross Sectional Pipe Wall Area

The cross-sectional wall area - or area of piping material - can be calculated as

Am = π (do / 2)2 - π (di / 2)2

= π (do 2 - di 2) / 4                               (2)

where

Am = cross-sectional wall area of pipe (m2, in2)

do = outside diameter (m, in)

Weight of Empty Pipes

Weight of empty pipes per unit length can be calculated as

wp = ρm Am

= ρm (π (do / 2)2 - π (di / 2)2

= ρm  π (do2 - di2) / 4                              (3)

where

wp = weight of empty pipe per unit length (kg/m, lb/in)

ρs = density of pipe material (kg/m3, lb/in3)

Weight of Liquid in Pipes

Weight of liquid in pipes per unit length can be calculated as

wl = ρl A

= ρl π (di / 2)2

= ρl π di2 / 4                                   (4)

where

wl = weight of liquid in pipe per unit length of pipe (kg, lb)

ρl = density of liquid (kg/m3, lb/in3)

Weight of Pipe filled with Liquid

Weight of pipe filled with liquid per unit length can be calculated as

w = wl + wp                          (5)

where

w = weight of pipe and liquid per unit length of pipe (kg, lb)

Outside Surface Area of Pipes

Outside surface area of steel pipes per unit length can be calculated as

Ao = 2 π (do / 2)

=  π do                            (6)

where

Ao = outside area of pipe - per unit length of pipe (m2, in2)

Inside Surface Area of Pipes

Inside surface area of steel pipes per unit length can be calculated as

Ai = 2 π (di / 2)

=  π di                             (7)

where

Ai = inside area of pipe - per unit length of pipe (m2, in2)

Related Topics

• Dimensions

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

Related Documents

ANSI Schedule 40 Steel Pipes - Dimensions

Internal and external diameters, areas, weights, volumes and number of threads for ANSI schedule 40 steel pipes.

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Convert between units of area.

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The Darcy-Weisbach equation can be used to calculate the major pressure and head loss due to friction in ducts, pipes or tubes.

Hazen-Williams Friction Loss Equation - calculating Head Loss in Water Pipes

Friction head loss (ftH2O per 100 ft pipe) in water pipes can be estimated with the empirical Hazen-Williams equation.

Ice coat weigth on horizontal pipe lines.

Manning's Formula and Gravity Flow

Calculate cross-sectional average velocity flow in open channels.

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Weight calculating equation for steel pipes.

Pipes - Fractional Equivalents

Fractional vs. decimal inches.

Pipes - Nominal Wall Thickness

Nominal wall thickness of seamless and welded carbon and alloy steel pipes

Pipes and Tubes - Water Content

Water content in steel pipes and copper tubes.

Stainless Steel Pipes - Dimensions and Weights

Dimensions, wall thickness and weights of stainless steel pipes according to ASME B36.19 Stainless Steel Pipes.

Welded Steel Pipes - Weights

Nominal weights of welded steel pipes ranging 26 - 60 inches.

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