General Requirements for Piping. All piping required shall be designed and installed to obtain optimum operating conditions, and shall be compatible with the machinery or equipment serviced, including pressure, volume and temperature requirements. All piping, valves and fittings shall comply with material specifications of the design standards for that particular service. New piping added to or replacing an existing system shall duplicate that system, both in size, material, and routing, unless otherwise specified. New piping, where installed in coordination with new equipment or machinery, shall be installed in a manner that does not adversely impact personnel with tripping or overhead hazards. New fuel oil, lube oil, or hydraulic piping shall be seamless steel, Schedule 80, to match existing pipe material. Pipe shall be pickled prior to installation. Seamless stainless steel tubing may be used as appropriate in Hydraulic systems. New raw, jacket or sanitary water piping shall be with 90-10 copper-nickel, Schedule 80. New drain piping shall be replaced in kind. Piping shall be led directly as per existing application. The finished installation shall include the pipe, valves, unions, elbows, reducers, tees and fittings and all necessary subparts. Unions and flanges shall be required to facilitate installation and subsequent removal. High-pressure flanges shall be used where originally provided. Flexible connections to machinery components shall be required where vibration may be anticipated. Piping shall not pass over switchboards and be kept clear of switchgear, wiring, etc. All work shall be templated from the vessel. Piping shall be secured by supports and hangers to avoid excessive strains; avoid the weight of the piping being transmitted to valves and fittings; minimize the effects of vibration, shock, pitching and rolling of the vessel; and permit proper thermal expansion and contraction. Provision may be made for expansion and contraction by changes in direction of pipe runs or by use of expansion bends, joints, loops or offsets. Galvanizing destroyed by welding or other activity shall be restored to original. All new steel galvanized pipe shall be hot dipped galvanized. All burrs shall be removed from the ends of all piping after any cutting or threading. Pipe ends shall be dressed with a reamer before installation. Valve type shall be consistent with the service. All valve materials shall match existing. New valves shall be approved by the COR. All valves are to be pressure-tested in the presence of the COR or the QAE, and if necessary the USCG, prior to installation on the vessel. Where three or more valves are located together for the same service, they shall be combined into a manifold. Any new fuel supply lines shall include a new shut-off valve, one at each tank and one at each fuel pump. A brass or aluminum label plate shall be attached to the hand-wheel of all new valves to indicate its function. New valves for seawater service shall be stainless steel or bronze and have a pressure rating appropriate for that service. Valves and operating mechanism shall be readily accessible. Watertight integrity shall be maintained where pipes are carried through watertight bulkheads, decks or tank tops. Heat sensitive materials shall not be used in piping systems that penetrate watertight subdivisions. Where overboard discharge lines or valves are attached to the inside of the hull, the hull shall be reinforced to maintain the original strength and integrity. Spool pieces with flanges shall be used for all galvanized pipe deck and bulkhead penetrations to prevent damage to galvanizing due to welding. Pipe penetrations through watertight bulkheads and decks shall be accomplished by welding pipe to a sleeve that is then welded to the bulkhead or deck. All fastenings used to connect valves to shell connections shall be stainless steel. Where dissimilar metals occur, the Contractor shall insulate to prevent electrolytic action. Any new piping shall be color-coated in accordance with the vessel’s current scheme.
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