Each pipe shall be tested by the manufacturer and shall
withstand a hydraulic pressure to one and half time the design
pressure, but not greater than pressure calculated by the
formula given below.
In the absence of working pressure
indicated in the Test Certificate then the test
pressure indicated in the Test Certificate divided by 1.5
shall be the maximum working pressure.
P = 2St/D
= test pressure
D = specified outside diameter of the pipe
t = specified wall thickness of the pipe
= stress which shall be taken as 40% of the minimum tensile
strength at room
Notwithstanding anything contained in the above clause,
the hydraulic test at the maker's works may be dispensed with
provided that the pipes are subject to non destructive testing
by an appropriate method like Ultrasonic or Eddy Current or
Stray flux testing.