mechanical engineering

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 - di4)
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 - di4) / do
where
Z = section modulus (in3)

Transverse Metal Area
Transverse metal area can be expressed as
Am = π (do2 - di2) / 4
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
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
where
Ai = internal pipe surface area (ft2 per ft pipe)

Transverse Internal Area
Transverse internal area can be expressed as
Aa = 0.7854 di2
where
Aa = transverse internal area (in2)

Circumference External
External circumference can be expressed as
Ce = π do
where
Ce = external circumference (in)

Circumference Internal
Internal circumference can be expressed as
Ci = π di
where
Ci = internal circumference (in)