Steel Tube Mill Hydrotester Repair Project: On Site Machining, Welding, Stress Relief and NDT TEAM Service: Field Machining, Specialty Welding and Inspection Need and Challenge: The 15,000 PSI Hydrostatic Tube and Pipe testing mill sealing surface heads, at a major manufacture of pipe and tube, had become cracked. The surface of the fill and purge head blocks in the hydrotester require a fine, indication-free finish on the sealing surfaces. The surfaces had become cracked to such an extent that, while the testing machine could still maintain a 15,000 PSI hydrostatic test pressure, excessive amounts of water were being wasted during the test process. The material of the head blocks, AISI 4340 Nickel – Chrome –Moly, requires specialized weld media and pre and post weld heat treat

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