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)
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)
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)
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)
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)
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)
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)
Ai = inside area of pipe - per unit length of pipe (m2, in2)
Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more.
Internal and external diameters, areas, weights, volumes and number of threads for ANSI schedule 40 steel pipes.
Convert between units of area.
The Darcy-Weisbach equation can be used to calculate the major pressure and head loss due to friction in ducts, pipes or tubes.
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.
Calculate cross-sectional average velocity flow in open channels.
Pipe and Tube Equations - moment of inertia, section modulus, traverse metal area, external pipe surface and traverse internal area - imperial units
Weight calculating equation for steel pipes.
Fractional vs. decimal inches.
Nominal wall thickness of seamless and welded carbon and alloy steel pipes
Water content in steel pipes and copper tubes.
Dimensions, wall thickness and weights of stainless steel pipes according to ASME B36.19 Stainless Steel Pipes.
Nominal weights of welded steel pipes ranging 26 - 60 inches.