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CHAPTER 2 TECHNICAL PROVISIONS SECTION 1 DESIGN PRINCIPLES 1 Arrangement 1.1 General 1.1.1 All machinery, systems and components that shall be operated or subject to inspection shall be installed and arranged for easy access. 1.1.2 All components in a system shall be satisfactorily matched with regard to function, capacity and strength. Relative motions between parts of the machinery shall be allowed for without inducing detrimental stresses. 1.1.3 All machinery shall be equipped with control and instrumentation considered necessary for safe operation of the machinery. 1.1.4 All spaces in which machinery is operated and where flammable or toxic gases or vapours may accumulate, or where a low oxygen atmosphere may occur, shall be provided with adequate ventilation under all conditions. Guidance note: By adequate ventilation is meant natural or mechanical ventilation sufficient to prevent an accumulation of gases above a concentration of 25% of their lower explosion limit (LEL). ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- 1.1.5 The capacity and arrangement of machinery spaces and emergency generator room ventilation shall cover demands for operating the machinery, boilers and emergency generator at full power in all weather conditions. On floating installations, ventilation inlets and outlets shall be located not less than 4.5 m above freeboard deck. Supply of air to the engine room/main power generation room, emergency power room and fire pump room shall be ensured even in the event of failure of one ventilation fan. As an alternative to the redundancy requirements in [2.3] alternative provision of air by adequate openings will be specially considered. The air inlets and air outlets on open deck shall be positioned such as to avoid the ingress of exhaust air through the inlet openings into machinery space (short circuiting of air). Guidance note: Necessary capacity of ventilation may be calculated according to ISO Standard 8861. ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- 1.1.6 Service and utility systems (e.g. steam, heating medium, cooling medium, compressed air, drains etc.) connected to systems containing flammable or toxic liquids or gases shall normally not be combined with similar systems located in non-hazardous areas or connected to non-hazardous systems. 1.1.7 Any connection between hazardous and non-hazardous systems shall be designed to eliminate or control the risk of ingress of hazardous material from one system to the other due to incorrect operation or leaks. The following issues shall be evaluated by the designer and documented before systems are interconnected: Offshore standards, DNVGL-OS-D101. Edition January 2018 Page 15 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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