Section 1 Machinery Installations and Electrical Equipment for Units

101. General

1. Application

(1) The requirements in this Section apply to engines, shaftings and power transmission gears, boil- ers, pressure vessels, auxiliaries, piping arrangements(hereinafter referred to as "machinery") and electrical equipment installed in units.

(2) In addition to the requirements in this Section, the requirements relevant to the machinery and

electical equipment in Ch 11 and in Pt 5 and Pt 6 of Rules for the Classification of Steel Ships are also to be complied with depending upon the service of the unit.

2. Conditions of inclinations

(1) All machinery, components and systems essential to the safe operation of a unit are to be de- signed to operate under the following static conditions of inclination :

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

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

(C) 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.

(2) The emergency generator and its prime mover and any emergency accumulator battery are to 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 Ch 7. However, in no case need the equipment be designed to operate when inclined more than:

(A) 25° in any direction on a column-stabilized unit :

(B) 15° in any direction on a self-elevating unit. : and

(C) 22.5° about the longitudinal axis and/or when inclined 10° about the transverse axis on a surface unit.

3. Terminology

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

(A) Anchor handling systems

(B) Mooring systems

(C) Fire extinguishing systems

(D) Bilge systems

(E) Ballast systems

(F) Jacking systems

(G) Lighting systems

(H) Interior communication systems

(I) Ventilation systems in the compartments in which internal combustion engines or boilers are installed or other compartments required to be ventilated

(J) Feed water systems and burning systems for boilers which supply steam to any one of the

systems prescribed in (A) to (I) and (K).

(K) Electric power plant and their starting arrangements (hereinafter referred to as "main source of electrical power") for the systems prescribed in (A) to (J), lighting systems required by

the National or International Regulations to be installed in the units such lights, signal lights and for the radio equipment

(L) Other systems considered necessary by the Society

(2) Restricted service unit is a unit whose navigation route or service area is limited waters, smooth waters or equivalent.

as navigation

to the coastal

4. Alternative design and arrangements

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

5. General

(1) All machinery, electrical equipment, boilers and other pressure vessels, associated piping systems, fittings and wiring is to 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 is to 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 conditions to which it will be subjected. Consideration is to 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 out under the normal service condition.

(6) The machinery is to be located in well ventilated spaces capable

tioned in (3).

(7) Adequate provisions are to be made to facilitate inspection and including boilers and other pressure vessels.

(8) Where it is intended to burn fuels of a flash point below 60 °C,

unhealthy gases will not leak

of discharging the gases men- maintenance of the machinery

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.

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

(10) Where risk from overspeeding of machinery exists, means are to 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 in- ternal pressure and may be subject to dangerous overpressure, means are to, where applicable,

be provided which will protect against such excessive pressure.

(12) Machinery, where applicable, is to be provided with automatic shutoff arrangements or alarms in the case of failures, such as lubricating oil supply failure, which could lead rapidly to com- plete breakdown, damage or explosion.

(13) Means are to be provided whereby normal operation of vital systems, such as ballast systems in semi-submersible units, jacking systems in self-elevating units and blow-out preventers, can be sustained or restored even though one of the essential auxiliaries becomes inoperable.

(14) Means are to be provided to ensure that machinery can be brought into operation from the “dead ship” condition without external aid.

102. Engines, shaftings and power transmission gears

1. Internal combustion engines

(1) General construction, safety devices, installation, exhaust arrangements and fuel oil arrangements of internal combustion engines are to be in accordance with the requirements in Pt 5, Ch 2, Sec 2 and Ch 6, Sec 6 and 9 of Rules for the Classification of Steel Ships respectively. However, the requirement in Pt 5, Ch 2, 203. 10 of Rules for the Classification of Steel Ships for alarming devices of lubricating oil supply is only applied for engines for the main source of electrical power and for engines for the power plant of jacking systems.

(2) Internal combustion engines used for the systems essential for the safety of the units are to be

in accordance with the requirements in Pt 5, Ch Steel Ships.

2, Sec 2 of Rules for the Classification of

(3) Internal combustion engines are not to be installed in the hazardous areas as delineated in Ch

8, Sec 2. Where they are unavoidably installed, special consideration is to be given to the ar- rangement to eliminate the risk of ignition of inflammable or explosive gases existing around

these engines.

(4) Exhaust outlets of internal combustion engines are to be fitted with suitable spark arresting de- vices and to discharge outside the hazardous areas. Exhaust pipe insulation, if fitted, is to be protected against possible oil absorption.

(5) Air intakes for internal combustion engines are to be not less than 3 m from the hazardous areas as delineated in Ch 8, Sec 2.

2. Steam turbines

(1) Steam turbines are to be provided with overspeed protective devices to prevent the design speed from being exceeded by more than 15 %.

(2) Steam turbines used for the systems essential for the safety of the units are to be in accordance with the requirements in Pt 5, Ch 2, Sec 3 of Rules for the Classification of Steel Ships.

3. Gas turbines

Gas turbines are to be in accordance with the requirements in Pt 5, Ch 2, Sec 4 of Rules for the Classification of Steel Ships.

4. Stern bearings and sealings of propeller shafts

Where the units with propulsion machinery are impractical to dock, the units are to be designed to enable the measurement of weardown of the stern bearings and the inspection and repair of bear- ings and sealings in a floating condition.

5. Power transmission gears

All gearing, shafts and couplings used for transmission of power to machinery are to 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 driv- en or of which they form part.

103. Boilers and pressure vessels

1. Boilers and pressure vessels are to be in accordance with the requirements in Pt 5, Ch 5 of

Rules for the Classification of Steel Ships.

2. Boilers are not to be installed in the hazardous areas as delineated in Ch 8, Sec 2.

3. Exhaust outlets of boilers are to be located outside the hazardous areas.

104. Auxiliaries and piping arrangements

1. General

(1) Auxiliaries and piping arrangements are to be in accordance with the requirements in this Article as well as those in Pt 5, Ch 6 of Rules for the Classification of Steel Ships.

(2) Pipes are to be arranged inboard of the zone of assumed damage penetration in Ch 7, 104. un-

less special consideration has been taken in the damage stability review.

(3) Where valves of piping systems are arranged for remote control and are power-operated, a sec- ondary means of operating the valves which may be manually controlled, is to be provided.

(4) Piping systems carrying non-hazardous fluids are generally to be separated from piping systems

which may contain hazardous fluids. Cross connection of the piping systems may be permitted where means for avoiding possible contamination of the non-hazardous fluid system by the haz- ardous medium are provided.

(5) For prevention of ignition possibility, exhaust pipe insulation, if fitted, is to be encased in steel sheathing or equivalent material against possible flammable oil absorption.

2. Feed water systems and fuel oil burning systems for boilers

For boilers intended to supply steam for other than the systems or the equipment for the safety of the unit and for the propulsion of the unit (only applicable to the unit which has the main pro- pulsion machinery), only one feed water piping and pump and fuel oil burning system for boilers

may be acceptable notwithstanding the requirements in

Pt 5, Ch 6, Sec 5 and 6 of

Rules for

the Classification of Steel Ships.

3. Arrangements for oil fuel, lubricating oil and other flammable oils

(1) Arrangements for the storage, distribution and utilization of oil fuel and pressure lubrication sys- tems are to be such as to ensure the safety of the unit and persons on board.

(2) Arrangements for the storage, distribution and utilization of other flammable oils employed under

pressure in power transmission systems, control and activating systems and heat transfer systems are to be such as to ensure the safety of the unit and persons on board.

(3) In machinery spaces pipes, fittings and valves carrying flammable oils are to be of a material approved by the Society.

(4) Location and arrangement of vent pipes for fuel oil service, settling and lubrication oil tanks are

to be such that, in the event of a broken vent pipe, the risk of ingress of rainwater or seawater is minimized.

(5) Two fuel oil service tanks for each type of fuel used on board necessary for propulsion and vi-

tal systems or equivalent arrangements are to be provided, each with a capacity of at least eight hours at the maximum continuous rating of the propulsion plant, if any, and normal operating load of the generator plant.

(6) High pressure fuel delivery lines

(A) All external high pressure fuel delivery lines between the high pressure fuel pumps and fuel injectors are to be protected with a jacketed piping system capable of containing fuel from a high pressure line failure. A jacketed pipe incorporates an outer pipe into which the high pressure fuel pipe is placed forming a permanent assembly. The jacketed piping system is to include a means for collection of leakages and arrangements are to be provided for an alarm to be given of a fuel line failure.

(B) All surfaces with temperatures above 220°C, which may be impinged as a result of a fuel system failure, are to be properly insulated.

(C) Oil fuel lines are to be screened or otherwise suitably protected to avoid, as far as practi- cable, oil spray or oil leakages onto hot surfaces, into machinery air intakes, or other sour-

ces of ignition. The number of joints in such piping systems is to be kept to a minimum.

4. Compressed air systems

(1) Pressure-relief valves are to be provided to prevent excess pressure in any part of compressed air systems and where water jackets or casings of air compressors and coolers might be sub- jected to dangerous excess pressure due to leakage into them from air pressure parts.

(2) The starting air arrangements for internal combustion engines are to be adequately protected against the effects of backfiring and internal explosions in the starting air pipes.

(3) Starting air pipes from the air receivers to internal combustion engines are to be entirely sepa- rate from the compressor discharge pipe system.

(4) Provision is to be made to reduce to a minimum the entry of oil into the starting air pressure systems and to drain these systems.

5. Bilge systems

(1) An efficient bilge pumping system is to be provided, capable of pumping from and draining watertight compartments other than spaces permanently appropriated for the carriage of liquid and for which other efficient means of pumping are provided, under all practical conditions whether the unit is upright or inclined, as specified in 101. 2. Additional suctions are to be provided in large compartments or compartments of unusual form, as deemed necessary by the Society. In addition to bilge piping arrangements required by (10) below, means are to be pro-

vided to detect the presence of water in such compartments which are

adjacent to the sea or

adjacent to tanks containing liquids and in void compartments through which pipes conveying liquids pass. If the Society is satisfied that the safety of the unit is not impaired, the means to detect the presence of water may be dispensed with.

(2) Emergency bilge suctions may be dispensed with notwithstanding the requirements in Pt 5, Ch 6, 403. 6 of Rules for the Classification of Steel Ships.

(3) For units subject to the requirements in this Section, the requirements for the direct bilge suc-

tions prescribed in Pt 5, Ch 6, Sec 4 of Rules for the Classification of Steel Ships are only applied for compartments under the load line containing the main source of electric power. Where, however, these compartments are pumped up by exclusive bilge pumps, the direct bilge suctions may be dispensed with.

(4) Notwithstanding the requirements in Pt 5, Ch 6, Sec 4 of Rules for the Classification of

Steel Ships, in determination of the internal diameters of the main bilge line and the branch bilge suctions, the following requirements are to be complied:

(A) Branch bilge suction pipes from each compartment are to be of the internal diameter ob-

tained from the following formula or the standard pipes of internal diameter nearest to the calculated diameter. In case where the internal diameter of such standard pipes is short of the calculated value by 5 mm or more, standard pipes of one grade higher diameter are to be used. The internal diameter of any bilge line is not to be less than 50 mm .

ᾘ Ņ ĪǾÌJΡ̓ÜA ÑĪJ Nmm Ń

where :

ᾘ :

A :

(B) The cross

Internal diameters of the branch bilge suctions (mm ).

Wetted surface of the compartment, excluding stiffening members when the com- partment is half filled with water (mĪ ).

sectional area of the main bilge line is not to be less than the combined areas

of the two largest branch suctions.

(5) The capacity, Ç, of each bilge pumping unit or bilge pump is not to be less than that required by the following formula.

Ī ŇĮ

Ç Ņ JǾĴĴᾘᾩÌL

NmĮÕhrŃ

where:

ᾘᾩ = Required internal diameter of main bilge line (mm )

(6) Taking account of purposes and operating mode of the units, the Society may accept one bilge pump notwithstanding the requirements in Pt 5, Ch 6, Sec 4 of Rules for the Classification of Steel Ships.

(7) The following additional provisions are applicable to column-stabilized units:

(A) Chain lockers which, if flooded, could substantially affect the unit’s stability are to be pro- vided with a remote means to detect flooding and a permanently installed means of dewatering. Remote indication of flooding is to be provided at the central ballast control station.

(B) At least one of the pumps referred to in (8) and pump-room bilge suction valves are to be capable of both remote and local operation.

(C) Propulsion rooms and pump-rooms in lower hulls are to be provided with two independent systems for high bilge water level detection providing an audible and visual alarm at the

central ballast control station.

(8) At least two self-priming power pumps connected to each bilge main should be provided.

Ballast, sanitary and general service pumps may be accepted as independent power bilge pumps

if fitted with

the necessary connections to the bilge pumping system. Ejectors and their asso-

ciated pumps which are so arranged as to be capable of discharging bilge effectively will be

considered as

power bilge pumps prescribed in Pt 5, Ch 6, Sec 4 405. 1 (3) of Rules for

the Classification of Steel Ships.

(9) Compartments below deck containing essential equipment for operation and safety of the unit

are to have a permanently installed bilge or drainage system. These compartments are to be drained with at least two bilge pumps, or equal.

(10) All distribution boxes and manually operated valves in connection with the bilge pumping ar- rangements are to be in positions which are accessible under normal circumstances. Where such

valves are located in normally unmanned spaces below the assigned load line and not provided with high bilge water level alarms, they are to be operable from outside the spaces.

(11) Chain lockers are to be capable of being drained by a permanently installed bilge or drainage

system or by portable means. Means are to be provided for removal of mud and debris from the bilge or drainage system.

(12) Void compartments adjacent to the sea or to tanks containing liquids, and void compartments

through which piping conveying liquids passes, are to be drained by permanently installed bilge or drainage systems or by portable means. If portable pumps are used, two are to be provided

and both pumps and arrangements for pumping are to be readily accessible. Void compartments as defined above which are not provided with bilge or drainage systems in compliance with the above are to be accounted for the stability analysis in the unit.

(13) Drainage of hazardous areas is to be given special consideration having regard to the risk of explosion. Hazardous and non-hazardous areas are to be provided with separate drainage or pumping arrangements.

(14) A means to indicate whether a valve is open or closed is to be provided at each location

from which the valve can be controlled. The indicator is to rely on movement of the valve spindle.

(15) All bilge pipes are to be of steel or other suitable material having properties acceptable to the

Society. Special consideration is to be given to the design of bilge lines passing through bal last tanks taking into account effects of corrosion or other deterioration.

(16) The arrangement of the bilge pumping system is to be such as to prevent the possibility of wa ter passing from the sea into dry spaces, or inadvertently from one compartment to another.

6. Ballast systems for column-stabilized units

(1) Suitable ballast systems are to be provided to the units for which the ballasting and de-ballast- ing are essential for the safe operation during service and navigation.

(2) For column-stabilized units, the ballast systems are to consist of two or more adequate means by way of pumps or other suitable apparatuses, and they are to be capable of ballasting and

de-ballasting all compartments even when one of them is out of service. The ballast pumps are

to be of the self-priming type or be provided with a separate priming system.

(3) It is to be possible to supply each ballast pump required by (2) above from the emergency

source of electrical power. The arrangements are storing the unit from an inclination specified in

to be such that the system is capable of re-

101. 2 (1) to a level trim and safe draught

condition after loss of any single component in the power supply system.

(4) Sounding devices of approved type are to be provided in the ballast tanks in the lower hulls of the column-stabilized units. However, for the units to be used at both the high and low pre-

determined ballast water levels, the sounding devices may be substituted by alarming devices

which will alarm at either of these levels.

(5) The system is to be capable of raising the unit, starting from a level trim condition at the deepest normal operating draft, to the severe storm draft, or a greater distance as may be speci- fied by the Society, within three hours.

(6) The ballast system is to be arranged to prevent the inadvertent transfer of ballast water from one quadrant to any other quadrant of the unit. The system is also to be arranged so that the transfer of ballast water from one tank to any other tank through a single valve is not possible except where such a transfer could not adversely affect the stability of the unit.

(7) The ballast system is to be arranged so that even with any one pump inoperable, it is capable of restoring the unit to a level trim condition and draft acceptable to the Society with respect to stability, when subject to the damage conditions specified in Ch 7, Sec 1. The Society may permit counter-flooding as an operational procedure. Counter-flooding is not to be considered as a means to improve the suction head available to the ballast pumps when considering the oper- ability of the ballast system after the damage specified in Ch 7, Sec 1.

(8) A central ballast control station should be provided. It is to be located above the worst damage

waterline and in a space not within the assumed extent of damage referred to in Ch 7 and ad- equately protected from weather. It is to be provided with the following control and indicating systems, having appropriate audible and visual alarms:

(A) ballast pump control system;

(B) ballast pump status-indicating system;

(C) ballast valve control system;

(D) ballast valve position-indicating system;

(E) tank level indicating system;

(F) draught indicating system;

(G) trim and heel indicators;

(H) power availability indicating system (main and emergency);

(I) ballast system hydraulic/pneumatic pressure-indicating system.

(9) In addition to remote control of the ballast pumps and valves from the central ballast control station, all ballast pumps and valves are to be fitted with independent local control operable in the event of remote control failure. The independent local control of each ballast pump and of

its associated ballast tank valves is to be in the same location.

her so that a failure in any one system will not affect the operation of the other systems.

(10) The control and indicating systems listed in (8) are to function independently of one another,

or have sufficient redundancy, such that a failure in one system does not jeopardize the oper ation of any of the other systems.

(11) The ballast tank level indicating system required by (8) above is to provide means specified in

the following (A) and (B).

(A) A means to indicate liquid levels in all ballast tanks. A secondary means of determining levels in ballast tanks, which may be a sounding pipe, is to be provided. Tank level sensors are to not be situated in the tank suction lines;

(B) A means to indicate liquid levels in tanks which, in view of the Society, could affect the stability of the unit. Tank level sensors are not to be situated in the tank suction lines.

(12) The draught indicating system required by (8) above is to indicate the draught at each corner of the unit or at representative positions as deemed appropriate by the Society.

(13) Each power-actuated valve is to fail to the closed position upon loss of control power. Upon reactivation of control power, each such valve is to remain closed until the reactivation of the

system is assumed. The Society may accept ballast valve arrangements that do not fail to

the

closed position upon loss of power provided that the Society is satisfied that the safety of the unit is not impaired.

(14) A means is to be provided at the central ballast control station to isolate or disconnect the

ballast pump control and ballast valve control systems from their sources of electrical, pneu matic or hydraulic power.

(15) All valves and valve control systems for their function are to be clearly marked. A means to

indicate whether a valve is open or closed is to be provided at each location from which the valve can be controlled. The indicator is to rely on movement of the valve spindle.

(16) A permanently installed means of communication, independent of the unit’s main source of electrical power, is to be provided between the central ballast control station and spaces that contain ballast pumps or valves, or other spaces that may contain equipment necessary for the

operation of the ballast system.

(17) All ballast pipes are to be of steel or other suitable material having properties acceptable to the Society. Special consideration should be given to the design of ballast lines passing

through ballast tanks,

taking into account effects of corrosion or other deterioration.

7. Air pipes and sounding pipes

(1) Air pipe openings and discharge openings of overflow pipes are to be located above the final

calculated

immersion line in the assumed damage condition specified in Ch 7, and are to be

positioned outside the extent of damage, as defined in Ch 7.

(2) Air pipes

and overflow pipes which could cause progressive flooding are to be considered in

the damage stability review.

(3) Where the air pipes or sounding pipes for the ballast tanks in the lower hulls of the column- stabilized units are exposed to sea water under the load water line, these pipes are to have suf- ficient thickness against corrosion and to be protected from mechanical damage or to have suffi- cient strength.

(4) One air pipe may be acceptable for certain tanks notwithstanding the requirements in Pt 5, Ch

6, Sec 2 of Rules for the Classification of Steel Ships provided that the Society consid- ered satisfactory taking account of the types and service conditions of the units.

(5) All tanks are to be provided with separate sounding pipes, or approved remote level indicating system. Where a sounding pipe exceeds 20 m in length, the minimum internal diameter is to be at least 50 mm notwithstanding the requirements in Pt 5, Ch 6, 203. 3 (3) of Rules for the

Classification of Steel Ships.

Sounding pipes are to be of the minimum internal diameter 38 mm . Where a sounding pipe ex- ceeds 20 m in length, the minimum internal diameter is to be increased to at least 50 mm .

(6) Where a remote level indicating system is used, an additional sounding system is to be pro-

vided for tanks which are not always accessible.

(7) Void compartments adjacent to the sea or

tanks containing liquids, and void compartments

through which piping carrying liquids passes are to be fitted with separate sounding pipes, ap- proved tank liquid level indicating apparatus or be fitted with means to determine if the void

tanks contain liquids. Voids as defined above which do not comply with this requirement are to be accounted for in the unit's stability analysis.

8. Ship-side valves

For the units for which the exemption of docking survey is especially approved by the Society, special considerations are to be given to a prevention of corrosion and marine growth prevention to the valves, cocks and distance pieces fitted to the shell plating under the load water line.

9. Remote operation of sea-water inlet and discharge valves

(1) Sea-water inlet and discharge valves in spaces below the assigned load line are not be provided with remote controlled valves.

(A) all column-stabilized units;

(B) all other units where the space containing the valve is normally unattended and is not pro- vided with high bilge water level detection.

(2) Where remote operation is provided by power- actuated valves for sea water inlets and dis- charges for operation of propulsion and power generating machinery, power supply failure of the control system is not to result in closing of open valves or in opening of closed valves.

(3) Consideration will be given to accepting bilge alarms in lieu of remote operation for surface type and self-elevating units specified in (1) (B).

10. Tests

Tests for the auxiliary machinery and piping are to be in accordance with the requirements in 109., notwithstanding the requirements in Pt 5, Ch 6, Sec 13 of Rules for the Classification of Steel Ships.

105. Jacking systems

1. General

(1) The jacking systems are to be designed to the satisfaction of the Society with respect to their driving systems, mechanisms, strength and safety devices.

(2) The jacking system is to be designed and constructed to maintain the safety of the unit in the

event of failure of a critical component and control devices or power supply during operation of the jacking system. Suitable monitoring is to be provided at a manned control station to in-

dicate such failure.

(3) Where hydraulic or pneumatic power is used to the jacking systems, two or more hydraulic or

pneumatic power sources are to be provided so that the jacking systems will be operated safely even when one of these power sources is out of service. However, for the restricted service units one hydraulic or pneumatic power source may be provided.

2. Plans and data to be Submitted

(1) A description of the jacking system, holding mechanism and associated systems

(2) Design plans showing the following arrangements and details, as applicable:

(A) Jacking system, including mechanical and hydraulic components such as rack and pinion, bearings, reduction gears, brakes, hydraulic power units, hydraulic cylinders, etc.

(B) Fixation system

(C) Jackcase

(D) Electric system diagrams

(E) Jacking motor and brake specifications and operating characteristics

(F) Electric and/or hydraulic controls

(G) Monitoring and alarm systems

(H) Lubrication methods

(I) Heating arrangements for low temperature operation

(3) Material specifications

(4) Design calculations, including strength, fatigue, buckling, rigidity and critical speed (resonance) analyses, as applicable to the particular system

(5) Specified service temperature

3. Material

(1) The material specifications for the jacking system are to be submitted by the designer. These specifications are to include as a minimum, chemical composition, yield strength, ultimate tensile strength, percent elongation and reduction of area, and hardness for gears and coupling teeth, and where required, impact values.

(2) Load bearing/torque transmitting components in the direct load path are to be constructed of

steel, or other acceptable ductile materials with an elongation not less than 12 %. Other materi- als suitable for the intended purpose may be specially considered.

(3) Materials for the load-bearing components of the fixation system in the direct load path are to comply with Ch 3, Sec 2, as applicable.

(4) For rack and pinion units, steel for the rack and rack attachments is to meet the requirements

for primary application specified in Ch 3, 202. and impact test requirements specified in serv- ice temperature in Pt 2, Table 2.1.7 of Rules for the Classification of Steel Ships.

(5) For systems actuated by hydraulic cylinders, steel for jacking pins and yoke is to meet the re-

quirements for primary application specified in Ch 3, 202. and impact test requirements speci- fied in service temperature in Pt 2, Table 2.1.7 of Rules for the Classification of Steel

Ships.

(6) Steel for torque transmitting parts for rack and pinion units is to meet the following impact test requirements.

4. Strength Analysis

(1) Strength calculations of the jacking system and holding mechanism are to be submitted in ac- cordance with 2 (4). Strength calculations are to consider at least the maximum loads of the following loading conditions, as applicable to the unit:

(A) Normal raising of hull

(B) Normal holding of hull

(C) Normal lowering of hull

(D) Pre-load raising

(E) Pre-load holding

(F) Pre-load lowering

(G) Normal raising of legs

(H) Normal holding of legs

(I) Normal lowering of legs

(J) Severe storm holding

Maximum rated loads associated with severe storm conditions

(elevated or afloat) and pre-load

holding condition are to be considered as combined loadings. Maximum rated loads associated

with the normal jacking, pre-load jacking and normal holding

conditions may be considered as

static loadings. When establishing the loads imposed on a jacking system during lifting oper- ations, friction losses at leg guides are to be considered. Definitions of combined loading and static loading comply with Ch 4, 301..

(2) For the purpose of strength calculation of the jacking system and for designing mechanical com-

ponents, the allowable stress are to comply with Ch 4, 303. as

applicable, except that gear re-

ducers are to comply with a recognized standard such as American Gear Manufacturers

Association (AGMA) standards. Where mechanical components

are designed according to the

von Mises stress criterion, the allowable stress are to comply with Ch 4, 210. 2.

(3) The scantlings of the load-bearing components of the fixation system in the direct load path are

to be determined on the basis of the allowable stresses specified in

(4) For gears, both tooth surface contact and tooth root bending considered. The calculated fatigue life is to be at least the design

Ch 4, Sec 2 and Sec 3. fatigue strength are to be life of the unit, but not less

than 20 years. Safety factors against maximum fatigue life in hours or cycles are to be as

follows.

(A) Tooth

root bending: F.S. = 1.5 for cumulative fatigue due to all lifting and lowering oper-

ations and all other applicable cyclic loads

(B) Tooth

surface contact: F.S. = 1.0 for cumulative fatigue due to all lifting and lowering op-

erations and all other applicable cyclic loads

5. Mechanical Components

In addition to the strength requirements for mechanical components in accordance with Par 4, the following requirements are to be complied with:

(1) Bearings are to be designed for the operational static and dynamic loads in accordance with ap- plicable recognized standards such as the latest editions of ISO 76 and ISO 281. Design calcu- lations are to be submitted for bearings not covered by recognized standards. Adequate bearing lubrication is to be provided. Manufacturer’s documentation is to be submitted to confirm the suitability of the bearings for operation at the design temperature of the unit.

(2) Brakes are to be designed to engage automatically in the event of failure of power supply to the motor(fail-safe type). The brake holding capacity is to be at least equal to 120% of the maximum required brake torque associated with the maximum rated load applied to the climbing pinion from all loading conditions.

(3) Flexible shock pads for jackcases are to be designed for the maximum severe storm loads and suitable for operation at the design temperature of the unit. Shock pads are to be suitably pro- tected against adverse effects of the marine and working environment which may lead to

degradation. Manufacturer’s technical specification is to be submitted to verify the suitability of the

shock pads for the intended service.

6. Electrical Power System

Jacking gear motor installations are to be in accordance with Ch 10, except that stallations will be permitted as follows:

(1) On each leg, two or more motors of any horsepower may be connected to circuit.

(2) The branch circuit is to be provided with short circuit protection set at not times the sum of the full load currents of the motors.

group motor in- a single branch

greater than ten

(3) A visual and audible alarm is to be given at the Jacking Control Station to indicate load condition in any of the jacking motors.

7. Hydraulic System

an over-

The hydraulic system for applicable requirements of

jacking units and holding mechanisms is to be in compliance with the

Pt 5, Ch 7 of Rules for the Classification of Steel Ships. Sufficient

redundancy of the hydraulic power unit or units servicing the jacking systems is to be provided to

maintain continuous jacking operation in the event of a single failure in the hydraulic power system.

8. Control, Monitoring, and Alarm System

(1) The central jacking control station is to be provided with the following alarms and indications.

(A) Audible and visual alarms for:

(a)

Motor overload or over temperature for each motor

(b) Unit out-of-level (elevated condition)

(c)

Significant differences in the currents or torque in the motors on one rack

(d) Rack phase differential, where applicable to the design

(B) Indication of:

(a)

Availability of power

(b) Current or torque in each motor (during raising and lowering operations)

(c)

Brake release status

(d) Hydraulic pressure

(e)

(f)

Air pressure Pin position

(g) Position of yoke

(h) Inclination of the unit, in two horizontal, perpendicular axes (elevated condition)

(2) Upon failure of the jacking system controls in the central control station, emergency controls to

operate the jacking system are to be available. An emergency stop is to be provided at each jack house. Emergency stop circuits are to be independent from the jacking control circuits. A voice communication system is to be provided between the central jacking control station and a location at each leg in self-elevating units.

9. Inspection and Material Testing

(1) All jacking systems, holding mechanisms and associated systems are to be constructed and in- stalled to the satisfaction of the Surveyor in accordance with approved plans.

(2) Welded construction is to be in compliance with the applicable requirements of Ch 3, Sec 3

and Pt 2, Ch 2 of Rules for the Classification of Steel Ships.

(3) Material tests for the components of the jacking systems, holding mechanisms and associated systems are to be carried out in accordance with Par 3 and Pt 2, Ch 1 of Rules for the Classification of Steel Ships.

(4) Gears of the climbing pinion gear train are to be examined at the plant of the manufacturer by

an approved crack detection procedure and such an examination is Surveyor.

10. Load tests

(1) Shop test

(A) Type tests

to be witnessed by the

For each size and type of jacking gears used in jacking systems,

load tests are to

be car-

ried out at 1.5 time of preload in the presence of the Surveyor.

After completion of test,

gear boxes are to be opened out for examination. When deemed appropriate by the

Society,

methods of load tests for jacking systems other than rack and pinion type may suitably modified.

(B) Production tests

For all jacking systems, no load tests are to be carried out in the presence of the Surveyor.

(2) On board test

After installation on board, the jacking systems are to be tested with the highest specified lifting and descending load during at least one operating cycle.

106. Electrical equipment

1. General

(1) Electrical equipment is generally to be in accordance with the requirements in

Rules for the Classification of Steel Ships with the exclusion of those in

Pt 6, Ch 1 of

Ch 17 and 19

and of those for test in each Chapter in the said Part. However, electrical equipment complying with any relevant regulation of the National Authority of the country in which the unit is to be registered or international standards may be accepted, provided that they are used solely for op-

erating purpose. The design and installation of other equipment including that used for drilling operations are to be such that there is minimal risk of fire due to its failure.

(2) Where the requirements in Pt 6, Ch 1 of Rules for the Classification of

applied in accordance with requirements in (1), the electrical equipment may

Steel Ships are be in accordance

with the requirements in the following Par

2 to 6 instead of the requirements in Pt 6, Ch 1,

201. 2, 509. 1 to 3 and 601. 2 and Ch 14 and 16 in the said Part. For the tests of the elec- trical equipment the requirements in 109. are to be applied.

(3) All electrical services necessary for maintaining the unit in normal operational and habitable conditions are to be assured without recourse to the emergency source of power.

(4) Electrical services essential for safety are to be assured in case of failure of the main source of

electrical power.

(5) Electrical and electronic equipment on the bridge are to be so installed that electromagnetic in- terference does not affect the proper function of navigational systems and equipment.

(6) The safety of personnel and unit from electrical hazards is to be assured.

2. Main source of electrical power

(1) The units are to be provided with at least two sets of main sources of electric power of suffi- cient capacity so that electric power supply to the systems essential for the safety of the units and to the equipment listed in (A) to (H) below can be maintained even when one set of these sources is out of service due to any failure of generators, driving engines and their associated auxiliaries.

(A) Ventilation of hazardous areas and those areas maintained at an overpressure to exclude the ingress of dangerous gases.

(B) Navigation, signal and special purpose lights.

(C) Lights for all machinery spaces, control stations, alleyways, stairway and exits.

(D) Fire pumps.

(E) Propulsion equipment.

(F) Bilge pumps.

(G) Ballast pumps for column-stabilized units.

(H) Radio equipment.

(2) For restricted service units, one set of the main sources of electrical power may be acceptable.

Where, however, the lighting systems of these units listed in above (1) (B) are solely operated by electric power, the units are to be provided with an independent electric power source capa- ble of operating these lightings in the event of failure of the main source of electrical power.

(3) Where a.c. generators are used as a main source of electrical power, they are to have sufficient capacity to permit the starting of the largest motor in the units without causing any other mo- tors to stall or any other devices to fail due to excessive voltage drop on the system.

(4) The requirements in above (1) to (3) do not apply to the units which are so designed that elec- tric power is supplied from other units or from the shore. However, the units having the light- ing systems listed in above (1) (B) are to be so designed as to be capable of operating these

lighting systems without supplying electric power from other units or

from the shore except that

two or more sets of electric power sources are provided at these suppliers.

(5) For restricted service units, where generators used mainly for operating purpose are provided in addition to the main source of electric power except the independent electrical power source re-

quired by above (2), these generators and their driving engine are to be regarded as machinery used solely for operating purpose.

3. Number and ratings of transformers for power and lighting

(1) The number and ratings of transformers for feeder circuits are to be sufficient to ensure the op- eration of the systems essential for the safety of the units as well as the systems or equipment listed in above Par 2 (1) (A) to (H) even when one of these transformers is out of service. Where, however, any other suitable means are provided to ensure the operation of these serv- ices, one transformer will be acceptable.

(2) The requirement in above (1) will by the Society.

4. Emergency electrical equipment

(1) The units are to be provided with

not be applied to the restricted service units where approved

emergency electrical equipment according to the requirements

in Pt 6, Ch 1, Sec 14 of Rules for the Classification of Steel Ships. However, the ca-

pacity of the emergency source of power and the kind of emergency loads will be varied de- pending upon the type of the unit.

(2) The emergency source of power is to be located, at a sufficient distance from any hazardous area prescribed in each Chapter, in such a place that fire, flooding or other casualties in the

space containing the main source of electrical power will not affect the operation of the emer- gency source of power.

(3) A self-contained emergency source of power is to be located on or above the uppermost con- tinuous deck and above the worst damage waterline and inboard of the damage conditions specified in Ch 7, Sec 1.

(4) The requirements in above (1) to (3) will not be applied to the restricted service units.

5. Final sub-circuits

(1) In general, each motor for the systems or equipment essential for the safety of the units is to be connected to a separate final sub-circuit.

(2) Lighting circuits are to be supplied by final sub-circuit separate from those for heating and

motor. This requirement does not apply to cabin fans and electrical appliances for domestic use.

(3) Each heater is to be connected to a separate final sub-circuit except that small heaters may be connected to a single final sub-circuit of aggregate current rating not exceeding 15A.

(4) Each insulated pole of final sub-circuit is to be protected by a fuse or a circuit -breaker.

6. High voltage electrical installations

(1) Where the high voltage electrical systems or equipment exceeding the voltage of a.c. 1 kV is used for the systems or equipment essential for the safety of the units, the constructions and in- stallations of these systems or equipment are to be in accordance with Pt 6, Ch 1, Sec 16 of Rules for the Classification of Steel Ships.

(2) Other high voltage electrical equipment and cables used solely for operating purpose may com- ply with National or International Standards recognized by the Society.

7. Electrical equipment in hazardous areas

(1) Electrical equipment permitted in hazardous areas is to be in accordance with the requirements in Pt 6, Ch 1, Sec 9 of Rules for the Classification of Steel Ships as well as those in this Article.

(2) Electrical equipment permitted in hazardous areas specified in Ch 8 is to be as follows.

(A) Zone 0 areas :

Certified intrinsically safe circuits or equipment and associated wiring.

(B) Zone 1 areas :

(a) Certified intrinsically safe circuits or equipment and associated wiring.

(b) Certified flameproof (explosion proof) equipment.

(c)

Certified increased safety equipment ; for increased safety motors, due consideration is to be given to the protection against overcurrent.

(d) Pressurized-enclosure type equipment which is acceptable to the Society.

(e) Through runs of cables.

(C) Zone 2 areas :

(a) All equipment approved for Zone 1 areas.

(b) Any equipment of a type which ensures absence of sparks or arcs and of "hot spots" during normal operation and which is acceptable to the Society.

(3) Cables permitted in hazardous areas are to be as follows.

(A) Zone 0 areas : Cables associated with intrinsically safe circuits.

(B) Zone 1 areas - all cables are to be sheathed as follows:

(a) Nonmetallic impervious sheath plus metal screening or braiding for earth detection.

(b) Copper sheath plus nonmetallic outer sheath for earth detection (for mineral insulated ca- ble only).

(C) Zone 2 areas - all cables are to be sheathed as follows:

(a) As for Zone 1 areas.

(b) Nonmetallic sheath without metal screening or braiding, provided the cable is adequately protected against mechanical damage.

(4) Explosion proof type or equivalent essential lighting is to be supplied from at least two final sub-circuits in such a way that failure of any one of the circuits does not leave the space in

darkness. For lighting (explosion proof or equivalent type) in hazardous areas or spaces,

switches are to be of the two-pole type and wherever practicable located in a non-hazardous area.

107. Automatic and remote control for machinery

1. In cases where the automatic or remote control systems are adopted to the machinery installed in the units, the control devices and measuring instruments are to be such that the safe operation of the units can be made by the planned number of personnel.

2. The control system is to be designed to act, as far as possible, in fail-safe so as not to be in dan- ger of operators or not to damage the system concerned in the event of failure of the equipment or loss of the power source. The safety devices are, if necessary, to be provided independently from control systems.

3. The apparatus belonging to the systems or equipment essential for the safety provided with suitable means to ensure the safe operation of the units even or remote control systems are out of service.

of the units is to be when their automatic

4. Machinery installations of the unit which has the periodically unattended machinery spaces are to comply with the relevant requirements in Pt 9, Ch 3, 206. of Rules for the Classification of Steel Ships as well as the requirements in 101. to 106.

108. Spare parts, tools and instruments

1. General

Spare parts, tools and instruments prescribed in this Article are generally to be provided on the units. For the units specially approved by the Society, those may be dispensed with.

2. Spare parts

(1) Spare parts for internal combustion engines, steam turbines and boilers used for the main source

of electric power are to be in accordance with the requirements in

Rules for the Classification of Steel Ships.

Pt 5, Ch 1, Sec 4 of

(2) Spare parts for bilge pumps are to be in accordance with the requirements in Pt 5, Ch 1, Sec

4 of Rules for the Classification of Steel Ships.

(3) Spare parts for ballast pumps prescribed in 104. 7 are to be provided in accordance with the requirements in Pt 5, Ch 1, Sec 4 of Rules for the Classification of Steel Ships.

(4) Spare parts for starting air compressors of internal combustion engines used for the main source

of electrical power are to be provided in accordance with the requirements in Pt 5, Ch 1, Sec

4 of Rules for the Classification of Steel Ships.

(5) The Society may require to provide spare parts for jacking systems.

3. Tools and instruments

Tools and instruments for boilers used for the main source of electrical power and for all boilers are to be provided in accordance with the requirements in Pt 5, Ch 1, Sec 4 of Rules for the Classification of Steel Ships.

4. Spare Parts, tools and instruments for restricted service units

The restricted service units are to be in accordance with the requirements in Pt 5, Ch 1, Sec 4 of

Rules for the Classification of Steel Ships regarding as ships of restricted service.

109. Tests

1. General

(1) The tests for the machinery are to be in accordance with the requirements in this Article.

(2) The Society may require, where considered necessary, other tests than those prescribed in this Article.

(3) Where machinery has test certificates considered satisfactory by the Society, a part or all of tests for the machinery may be dispensed with.

(4) As regards machinery manufactured by mass production system or specially controlled system,

the Society may adopt test procedures suited to the production method, in place of tests stipu- lated in this rule, for the factory which considered suitable, upon the request of the manufacturer.

(5) The Society may adopt, where considered satisfactory, other test procedures than those stipulated in this Article.

2. Tests

(1) Boilers, pressure vessels belonging to PV -1 and PV -2, pipings and electrical equipment are to be tested in accordance with the relevant requirements in Pt 5 and Pt 6 of Rules for the Classification of Steel Ships. However, for pipings used solely for the operating purpose with the exclusion of those for inflammable or toxic media, tests may be dispensed with. For the ap- paratuses listed in the following (A) to (E), the testing at the manufacturer's works is to be car- ried out, where these apparatuses are used for the systems essential for the safety of the units. However, the high voltage tests considered suitable by the Society are to be carried out for electrical equipment with rated voltage above 3,000 V even where the equipment is not used for the systems or equipment essential for the safety of the units.

(A) Generators and motors

(B) Control gears for motors

(C) Switchboards

(D) Transformers for power and lighting

(E) Semi-conductor rectifiers for power

(2) Engines, shaftings and power transmission gears, pressure vessels belonging to PV -3 and auxil- iary machinery used for the systems or equipment essential for the safety of the units are to be tested in accordance with the relevant requirements in Pt 5 of Rules for the Classification of

Steel Ships. However, the tests may be waived depending upon the usage of these installations

where approved by the Society.

(3) The systems or equipment essential for the safety of the units are, after installation on board, to be subjected to performance tests.

(4) Remote control systems and automatic control systems for boilers and the systems or equipment essential for the safety of the units are, after installation on board, to be subjected to perform-

ance tests.

(5) Safety devices required by this rule are, after installation on board, to be tested.

(6) Running tests are, after installation on board, to be carried out for the generators stated in 106.

2 (5) and other electrical equipment not used for the systems essential for the safety of the

units coming under the following (A) or (B).

(A) Where rated voltage exceeds d.c. 1,000 V or a.c. 3,000 V .

(B) Where parallel runnings (including changing over operation) are carried out with the main

source of electrical power.