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1.6.5 Piping systems shall be adequately identified according to their purpose. Valves shall be permanently and clearly marked. 1.7 Operation of valves 1.7.1 Sea suction and discharge valves located in dry compartments, bilge valves and valves on the fuel oil and lubricating oil tanks which are situated higher than the double bottom tanks, shall be arranged for local manual operation. The changeover to manual operation from possible remote control arrangement shall be simple to execute. Guidance note: Where hydraulically actuated sea suction and discharge valves are located in the engine room, a hand pump ready for use fitted toeach actuator is considered acceptable as local manual operation. ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- 1.7.2 For remotely controlled valves failure in power supply or control signal shall not cause: — opening of closed valves — closing of open valves on fuel oil tanks and in cooling water system for propulsion and power generating machinery. 1.7.3 All valves in storage and ballast tanks which are hydraulically or pneumatically controlled shall also be arranged for manual operation, e.g. with a hand-pump connected to the control system. 1.7.4 Spindles of sea suction valves, discharge valves below the load line, emergency bilge valves in engine rooms and blow down discharge valves shall extend above the floor plates or by other means be easily accessible and visible. For vessels with periodically unmanned machinery machinery space technical requirements in DNVGL-RU- SHIP Pt.3 Ch.12 Sec.9 [4] shall be complied with. 1.7.5 Remotely controlled valves shall be provided with indications for open and closed valve positions at the control station. In cases where the possibility of local manual operation is required in addition to the remote control, means of observing the valve position at the valve location shall be provided. 1.7.6 In addition, requirements for weathertight and watertight integrity as given in DNVGL-OS-C301, shall be complied with. 1.8 Valves on sides and bottom 1.8.1 All sea inlet and overboard discharge pipes shall be fitted with easily accessible valves or cocks secured direct to the shell or sea chest. 1.8.2 If it is impractical to fit the valves or cocks directly to the shell or sea chest, distance pieces of steel may be accepted. These shall be made as short, rigid constructions, and shall not be of a thickness less than given in DNVGL- OS-C301 Ch.2 Sec.2 [7.2]. The distance piece shall extend through the shell plating or sea chest, and shall be welded on both sides or with full penetration welding. If valves are bolted to pads on the hull side, the pads shall be welded to the hull side as described for distance piece above. Offshore standards, DNVGL-OS-D101. Edition January 2018 Marine and machinery systems and equipment Page 18 DNV GL AS Chapter 2 Section 1PDF Image | Marine and machinery systems and equipment 2018
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