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Guidance note: This also applies for penetrations for equipment like speed log and draft gauges. ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- 1.8.3 For units or installations with double side and/or bottom, the following requirements apply: a) The valve may be fitted to the inboard tank boundary. b) The pipe wall thickness between side and bottom and inner boundary shall be minimum 11 mm, regardless of pipe diameter and regardless the shell plating thickness. c) Due attention shall be paid to the detail design to avoid high stresses being introduced at pipe fixations, as for example where the outer and inner boundary are connected by a short and straight pipe. d) Outlet- or inlet-pipes passing through heated fuel oil tanks or lubricating oil tanks shall be surrounded by cofferdams. 1.8.4 All outlets and sea inlet valves shall be fitted to the shell in such a way that piping inboard of the valves may be disconnected without interfering with the watertight integrity of the shell. 1.8.5 Valves and cocks for blow down of boilers shall have a protection ring fitted on the outside of the shell plating through which the spigot shall be carried. The spigot shall terminate flush with the outer side of the ring. 1.8.6 Suction and discharge valves of steel and sea chests and distance pieces shall be protected against corrosion by an efficient coating or equivalent. 1.8.7 All suction and discharge pipes shall be adequately protected where they are liable to be damaged by cargo and equipment. 1.8.8 Sea inlets shall be so designed and arranged as to limit turbulence and to avoid entry of air due to the unit/installation’s movements. 1.8.9 Scuppers and sanitary discharges shall be arranged in accordance with DNVGL-OS_C301 Ch.2 Sec.2, as applicable. 1.8.10 Sea inlets and discharge valves for systems where plastic piping is used shall be arranged with remote closing arrangement. The adequacy of this system shall be documented. 1.8.11 Sea suctions and discharge valves for units having additional class notation for navigation in ice see DNVGL-RU-SHIPS Pt.6 Ch.6 1.9 Fittings on watertight bulkheads 1.9.1 Where a collision bulkhead is provided, any pipes penetrating collision bulkhead to be arranged in accordance with DNVGL-RU-SHIPS Pt.4 Ch.6 Sec.3. 1.9.2 No drain valve or cock shall be fitted to watertight bulkheads unless they are accessible at all times and capable of being closed from above the deep load line. Alternatively the valve shall be of the self-closing type. Indication of open and closed position of the valves and cocks shall be provided. 1.9.3 Fastening of fittings, pipes, etc. to bulkheads or tunnel plating by means of bolts passing through clearing holes in the plating is not acceptable. Offshore standards, DNVGL-OS-D101. Edition January 2018 Page 19 Marine and machinery systems and equipment DNV GL AS Chapter 2 Section 1PDF Image | Marine and machinery systems and equipment 2018
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