Definition - What does Hydrotest mean?

Hydrotest, also known as hydrostatic test, is a way of checking the integrity of pressure vessels such as natural gas pipelines, gas cylinders, boilers, storage tanks as well as fuel tanks. With the help of this test, pressure tightness, strength and any leakages are checked. This test ensures the safety of the cost intensive setup and the human life as there is a risk of explosion from pipelines, storage tanks, etc., if any leakage takes place.

Petropedia explains Hydrotest

Hydrotest involves a test which is performed with the help of water (which is why this test is called hydro) passed through the pipelines or tanks or any fuel carrying vessels in order to inspect any leakages in the material assembly. This test also helps in understanding the pressure loss inside the pipeline system. This is done by shutting down the supply valve and pressurizing the vessel at the required pressure. The liquid will flow inside the pipeline and simultaneously the pressure loss inside the pipeline is observed. This method helps the management in the deciding the installations of gas compressors over the large distance pipelines and estimating the numbers of compressors to be used so that gas can be compressed and transported over long distances at the required pressure without any pressure drop in the pipeline system.

Hydrotest or hydrostatic test is one of the most common methods used for testing the pressure vessels, pipelines, tanks, for any leakages and pressurization integrity of the system.

Some of the other important parameters which can be identified using a hydrotest are:

  • Existing material flaws.
  • Flaws in the mechanical properties of the pipe and stress corrosion cracking (SSC).
  • Presence of active corrosion cells.
  • Presence of any hard spots that can cause failure in long run when they come in contact with hydrogen.
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