Pressure testing or hydrostatic testing is the test which is carried out after the installation of any pipeline before it is put into use. The purpose of the pressure testing is to investigate the various limits of the pipeline which will test areas such as the reliability, maximum capacity, leaks, joint fittings and pressure. Without this information the pipe can not be put into service and the owner/operators have no knowledge if the pipe meets the set requirements.
The information found from pressure testing aids to maintain the safety standards and the upkeep of the pipeline. When there is a new manufactured piece of equipment the pipelines are initially qualified by using a pressure test/hydrostatic test and regularly re-qualified at different intervals, which is called, the “modified hydrostatic test” or “proof pressure test”.