D : Outside diameter of the pipe (mm)
t : Thickness of the pipe (mm)
W : Unit weight of the pipe (kg/m)

2. HYDROSTATIC TEST PRESSURE

Hidrostatic test pressure can be calculated by a formulas which includes a stress value which is a percentage of the yield stress of the steel.

P : Hydrostatic Test Pressure (Bar)
k : A percent of the yield stress (stated on the related production standard)
s : Specified minimum yield stress (MPA)
t : Thickness of the pipe (mm)
D : Outside diameter of the pipe (mm)

P= 20 x k x s x t
D

3. UNIT SURFACE AREA OF THE PIPE

A= D x Pi x 10(-3) (m2/m)

A: Unit surface area (m2/m)
D: Outside diameter of the pipe (mm)