4.2 Machinery requirements
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Statutory Documents - IMO Publications and Documents - International Codes - 1989 MODU Code – Code for the Construction and Equipment of Mobile Offshore Drilling Units, 1989 – Resolution A.649(16) - Chapter 4 – Machinery Installations for all Types of Units - 4.2 Machinery requirements

4.2 Machinery requirements

  4.2.1 All boilers, all parts of machinery, all steam, hydraulic, pneumatic and other systems and their associated fittings which are under internal pressure should be subjected to appropriate tests including a pressure test before being put into service for the first time.

  4.2.2 Adequate provisions should be made to facilitate cleaning, inspection and maintenance of machinery including boilers and pressure vessels.

  4.2.3 Where risk from overspeeding of machinery exists, means should be provided to ensure that the safe speed is not exceeded.

  4.2.4 Where machinery including pressure vessels or any parts of such machinery are subject to internal pressure and may be subject to dangerous overpressure, means should, where applicable, be provided which will protect against such excessive pressure.

  4.2.5 All gearing and every shaft and coupling used for transmission of power to machinery essential for the safety of the unit or persons on board should be designed and constructed so that they will withstand the maximum working stresses to which they may be subjected in all service conditions, taking into account the type of engines by which they are driven or of which they form part.

  4.2.6 Internal combustion engines of a cylinder diameter of 200 mm or a crankcase volume of 0.6 m3 and above should be provided with crankcase explosion relief valves of an approved type with sufficient relief area. The relief valves should be arranged or provided with means to ensure that discharge from them is directed so as to minimize the possibility of injury to personnel.

  4.2.7 Machinery, where applicable, should be provided with automatic shutoff arrangements or alarms in the case of failures, such as lubricating oil supply failure, which could lead rapidly to complete breakdown, damage or explosion. The Administration may permit provisions for overriding automatic shutoff devices.

  4.2.8 Means should be provided whereby normal operation of vital systems, such as ballast systems in semisubmersible units, jacking systems in self-elevating units or control of blow-out preventers, can be sustained or restored even though one of the essential auxiliaries becomes inoperable.

  4.2.9 Means should be provided to ensure that machinery can be brought into operation from the "dead ship" condition without external aid.

Parent topic: Chapter 4 – Machinery Installations for all Types of Units
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