The purpose of the pressure test is to determine if leaks or significant permanent deformation emerge under or after the test. In addition, the object – to some extent – is to remove tensions.
The pressure test is usually performed with water or other harmless liquid. It is not allowed to pressure test with liquids which are toxic or corrosive, or if the flash point is less than or equal to 55 oC. Pressure testing of liquids with a temperature higher than 40 oC are not accepted, unless special precautions.
The test pressure must be at least 1.3 times the set pressure, but shall be stipulated by the original construction approval or construction Norm.
The test pressure must be maintained for such a long time that the structure can be examined in full, however, at least 10 minutes. At the test pressure of 100 bar, the pressure is lowered to the set pressure before the visual inspection is carried out.
The periodic pressure test is carried out in accordance with Executive Order Chapters 5, 6 and 7, Annex 3 point 2.3 and WEA guidelines, where available.