Pressure Testing of Pipes FAQs
Q: Why pressure test pipe work?
A: Pressure testing pipe work will ensure that the pipe work will perform satisfactorily when commissioned. Tests typically subject the pipe work to 1.5 or 2 times their working pressure and thus give assurance that the pipe work is free from leaks and able to withstand normal operating pressures throughout its working life.
Q: How do we pressure test pipe work?
A: Water is introduced in to the pipe and pressurised. For medium density polyethylene (MDPE) pipe work it is common to test the pipe to 1.5 times the pressure rating of the pipe. Thus, a pipe that is rated at 8 bar (SDR 17) will be tested to 12 bar.
The test must be conducted in a particular way to allow for the tendency for polythene pipes to stretch whilst under pressure. The test is a little simpler for rigid pipe materials.
Allowance is made for local topography to ensure that low lying pipe work is not over-stressed during the test.
For particularly long lengths of pipe work it is customary to sub-divide the length of pipe under test to identify problems more easily and manage factors such as air entrainment more easily.
