October 2009 Vol. 236 No. 10


Pipeline Hydro Test Pressure Determination

Hydrostatic testing has long been used to determine and verify pipeline integrity. Several types of information can be obtained through this verification process. However, it is essential to identify the limits of the test process and obtainable results. There are several types of flaws that can be detected by hydrostatic testing, such as: Existing flaws in the material, Stress Corrosion Cracking (SCC) and actual mechanical properties of the pipe, Active corrosion cells, and Localized hard spots that may cause failure in the presence of hydrogen. There are some other flaws that cannot be detected by hydrostatic testing. For example, the sub-critical material flaws canno

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