Unit Weight Calculation Method:
1.API,
ASTM, AISI Standards
W
 10.68(Dt)t
W= Weight per unit length(lb/ft)
t= Wall thickness of pipe(in)
D= Outside diameter od pipe (in)
The result of calculation is rounded to two places of decimals
2.BS
Standards
W
 10.68(Dt)t
W= Weight per unit length(lb/ft)
t= Wall thickness of pipe(in)
D= Outside diameter od pipe (in)
The result of calculation is rounded to a three figure number
2.JIS
Standards
W
 0.02466(Dt)t
W= Weight per unit length(lb/ft)
t= Wall thickness of pipe(in)
D= Outside diameter od pipe (in)
The result of calculation is rounded to a three figure number

Conversion
of Unit
1.API
Standards
W(lb/ft)
x 0.454 = W/' (kf/ft)
W, W'= Weight per unit length
W'=To be rounded to two decimal places
1.ASTM
Standards
W(lb/ft)
x 0.45359237 = W/' (kf/ft)
W, W'= Weight per unit length
W'=To be rounded to two decimal places
1.BS
Standards
W(lb/ft)
x 0.45359237 = W/' (kf/ft)
W'=To be rounded to three figure
1.Length
L(ft)
x 0.3048 = L'(m)
I(in)
x 25.4= I(m)
