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Nondestructive Examination (NDT) – Hydrostatic Test On Steam Boilers (Fired Pressure Vessels)

Since my area of expertise is in steam boilers, I will not discuss the hydrostatic test (HT) in unfired pressure vessel or power piping. Hydrostatic test is a form of NDT (nondestructive test) and is the most preferred method to detect leakage and cracks in boiler under water pressure. Other NDT’s such as magnetic particle test (MPT) or penetrant test (PT) are normally done to confirm the extent of damage after the leak point has been discovered. Only water pressure is allowed for HT. Steam or air is not allowed. “Hydro” itself means water. Water for all practical purposes is incompressible, and the pressure developed by the hydrostatic pump can be relieved instantaneously by releasing very small quantity of water, which would happen on leak occurring. Air is compressible...[Read More]