Section 1 General

101. Application

1. The requirements in this Section apply to engines, shaftings and power transmission gears, boilers, pressure vessels, auxiliaries, piping arrangements installed in all types of units.

2. Codes and standards of practice which have been proven to be effective by actual application by the offshore drilling industry which are not in conflict with the Rule, and which are acceptable to the Society, may be applied in addition to these requirements.

3. For ship type units, in addition to the requirements in this Chapter, the requirements relevant to the machinery in Pt 5 of Rules for the Classification of Steel Ships are also to be complied with.

4. Systems and equipment that are used solely for drilling and that may affect the safety of the unit on which they are installed may be designed to the alternative requirements of recognized standards acceptable to the Society.

102. General

1. All machinery, electrical equipment, boilers and other pressure vessels, associated piping systems, fittings and wiring should be of a design and construction adequate for the intended service

2. The machinery is to be so designed, manufactured and installed as to reduce to a minimum any danger to the units and persons on board under the normal service condition.

3. The design should have regard to materials used in construction, and to the marine and industrial purposes for which the equipment is intended, the working conditions and the environmental con- ditions to which it will be subjected. Consideration should be given to the consequences of the failure of systems and equipment essential to the safety of the unit.

4. The moving parts, hot surfaces and the live parts of the machinery are to be arranged with suitable protections, so that persons will be kept from getting injured.

5. The machinery is to be so constructed that any combustible or unhealthy gases will not leak out under the normal service condition.

6. The machinery is to be located in well ventilated spaces capable of discharging the gases men- tioned in Par 5.

7. Where it is intended to burn fuels of a flash point below 60 °C, closed cup test, this fact is to be indicated clearly on the arrangement submitted. The use of fuels of a flash point lower then 43 °C, closed cup test, will require special consideration of storage and handling facilities and controls as well as the electrical installation and ventilation provisions.

8. All boilers, all parts of machinery, all steam, hydraulic, pneumatic and other systems and their as- sociated 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.

9. Adequate provisions and arrangements should be made to facilitate safe access, cleaning, inspection and maintenance of machinery including boilers and pressure vessels.

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

11. 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 pro- vided which will protect against such excessive pressure.

12. 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 Society may permit provisions for overriding automatic shut- off devices.

13. Means should be provided whereby normal operation of vital systems, such as ballast systems in semisubmersible units, jacking systems in selfelevating units and blowout preventers, can be sus- tained or restored even though one of the essential auxiliaries becomes inoperable.

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

103. Conditions of inclinations

All machinery, components and systems essential to the safe operation of a unit are to be designed to operate under the following static conditions of inclination :

(1) when column-stabilized units are upright and inclined to an angle up to 15° in any direction :

(2) when self-elevating units are upright and inclined to an angle up to 10° in any direction :

(3) when surface units are upright and level trim and when inclined to an angle of list up to 15° either way and simultaneously trimmed to an angle up to 5° by the bow or stern.

The Society may permit or require deviations from these angles, in consideration of the type, size and service conditions of the unit.

104. Terminology

1. The systems essential for the safety of the units are those listed below :

(1) Anchor handling systems

(2) Mooring systems

(3) Fire extinguishing systems

(4) Bilge systems

(5) Ballast systems

(6) Jacking systems

(7) Lighting systems

(8) Interior communication systems

(9) Ventilation systems in the compartments in which internal combustion engines or boilers are in- stalled or other compartments required to be ventilated

(10) Feed water systems and burning systems for boilers which supply steam to systems prescribed in (1) to (9) and (11).

(11) Electric power plant and their starting arrangements (hereinafter referred to as electrical power") for the systems prescribed in (A) to (J), lighting systems

any one of the

"main source of required by the

National or International Regulations to be installed in the units such as navigation lights, signal

lights and for the radio equipment

(12) Other systems considered necessary by the Society

2. Restricted service unit is a unit whose navigation route or service area is limited to the coastal wa- ters, smooth waters or equivalent.

105. Alternative design and arrangements

When alternative design or arrangements deviate from the prescriptive provisions of the Code, an engineering analysis, evaluation and approval of the design and arrangements should be carried out in accordance with SOLAS regulation II-1/55.