PIPING – SPECIFIC REQUIREMENTS Sample Clauses

PIPING – SPECIFIC REQUIREMENTS. All piping shall be schedule 40, ASTM A-53, Type S or E except where otherwise indicated on the drawings or in these specifications. All piping between the side shell and the first inboard valve shall be a minimum of schedule 80. Fasteners for valves at the hull connections and seachests shall be stainless steel. All tank penetrations shall be through schedule 80 welded couplings unless specified elsewhere. Manually operated valves shall be readily operable by one person, directly or through mechanical advantage type operators. No cast iron valves or wafer valves shall be used at shell connections. Remotely operated valves shall also be operable locally. All valves must be outside stem and yoke (OS&Y) and rising stem type or fitted with open/close indicators. They shall be clockwise closing. Check valves shall be of a type best suited for the service condition, especially the flow velocity to ensure that the valve will fully open. A check valve shall be installed where a reversal of flow is possible and would be detrimental to proper functioning of the system, or might be injurious to equipment. Gate valves are intended to be fully open or fully closed and shall not be used for throttling the flow. All lines leading to the overboard discharges shall be angled downward sloping 45 degrees or better toward the water line. At the written request of the Contractor, the Government will consider the use of grooved mechanical pipe joining systems and valves for the potable water system, sewage system, vents and sounds, and drainage system. The pipe joining system must be ABS approved and specific system drawings shall be updated to reflect the pipe joining system components, and resubmitted to ABS for review and approval. COR has final authority on the use and implementation of grooved mechanical pipe joining systems. When grooved mechanical pipe couplings are used on roll grooved, the grooving tool shall be of the same manufacturer as the pipe couplings, and a spare grooving tool provided with the vessel. At the written request of the Contractor, the Government will consider the use of mechanical press pipe joining systems for the potable water system. The pipe joining system must be ABS approved and specific system drawings shall be updated to reflect the pipe joining system components, and resubmitted to ABS for review and approval. The COR has final authority on the use and implementation of mechanical press pipe joining systems. When mechanical press pipe cou...
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