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  1. QCMechanicalContr

    NACE Valve Modification

    We are being asked by a Refinery client to modify some 6" and 8" gate valves by adding a tap. MSS SP-45 is a spec showing tap locations for drains and by-passes on valves. We would tap by boring a hole at location A or B on figure 5 of MSS SP-45 and welding in a nippolet. The valve will then...

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