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1.10 Requirements dependent upon damage stability calculations For units or installations where damage stability requirements apply, precautions shall be taken to prevent intercommunication through damaged pipe lines between flooded and intact compartments. Guidance note: For this purpose, where any part of a pipe system is situated within the defined damaged area and the pipe line has an open end in a compartment assumed to be intact, then an isolating valve should be fitted. The valve should be situated outside the damaged area and should be operable from the freeboard deck or from another position and accessible when the unit or installation is in damaged condition. For bilge lines, the remotely operated stop valves may be substituted by a non-return valve. ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- Guidance note: For compliance with IMO MODU Code bilge lines may only be fitted with a positive closable valve operable from above the waterline. ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- 2 Construction and function 2.1 General 2.1.1 The machinery shall be so designed, installed and protected that risks of fire, explosions, accidental pollution, leakages and accidents thereof are acceptably low. 2.1.2 Reliability and availability of the machinery shall be adapted according to considerations of the consequences from machinery failures and disturbances. 2.1.3 The design arrangement of machinery foundations, shaft connections, piping and ducting shall take into account the effects of thermal expansion, vibrations, misalignment and hull interaction to ensure operation within safe limits. Bolts and nuts exposed to dynamic forces and vibrations shall be properly secured. 2.2 Environmental conditions 2.2.1 All machinery, components and systems essential to the safe operation of a unit should be designed to operate under the following static conditions of inclination: — column-stabilised units, from upright to an angle of inclination of 15° in any direction — self-elevating units, from upright to an angle of inclination of 10° in any direction — surface units, from upright and in level trim to an angle of inclination of 15° either way and simultaneously trimmed up to 5° by the bow or stern. Guidance note: Deviations from these angles may be required or considered, taking into consideration the type, size and service conditions of the unit. ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- (See MODU Code 4.1.4) 2.2.2 The emergency generator and its prime mover and any emergency accumulator battery shall be designed to function at full rated power when upright and when inclined up to the maximum angle of heel in the intact and damaged condition, as determined in accordance with DNVGL-OS-C301 Ch.2 Sec.1. In no case need the equipment be designed to operate when inclined more than: Offshore standards, DNVGL-OS-D101. Edition January 2018 Page 20 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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