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RULES FOR BUILDING AND CLASSINGMOBILE OFFSHORE DRILLING UNITS2001NOTICE NO. 1 – January 2002The following Rule Changes are EFFECTIVE AS OF 1 JANUARY 2002.PART 4MACHINERY AND SYSTEMSCHAPTER 2PUMPS AND PIPING SYSTEMSSECTION 1GENERAL(2002)7 PressureTests(Revise and add text as follows:)In addition to the testing and inspection of materials, as required in Chapter 3 of the Rule Requirements for Materials and Welding – Part 2, the following tests on the fabricated piping are to be witnessed by the Surveyor after bending and the attachment of flanges.Small bore pipes and tubes of less than 15 mm outside diameter may be exempted from the required hydrostatic tests.7.1Fuel-oil Service SystemPressure lines are to be tested before installation to 1.5 times the design pressure of the system, but not less than 3.4 bar (3.5 kgf/cm2, 50 psi).7.3Fuel-oil Suction and Transfer LinesTransfer systems and fuel-oil suction lines are to be tested before installation to 3.4 bar (3.5 kgf/cm2,50 psi).7.5Starting-air PipingPiping in starting-air systems is to be tested, preferably before installation, to 1.5 times the design pressure of the system.7.7Hydraulic Power PipingAfter fabrication, the hydraulic power piping system or each piping component is to be tested to 1.5 times the design pressure.7.9All PipingAfter installation all piping is to be tested under working conditions.Where it is not possible to carry out the required hydrostatic tests for all segments of pipes and integral fittings before installation, the remaining segments, including the closing seams, may be so tested after installation. Or, where it is intended to carry out all the required hydrostatic tests after installation, such tests may be conducted in conjunction with those required by this paragraph. In both these respects, testing procedures are to be submitted to the Surveyor for acceptance.7.11Specific SystemsThe following piping systems are to be hydrostatically tested in the presence of the Surveyorto 1.5P, but not less than 4 bar (4.1 kgf/cm2, 58 psi), after installation:i)gas and liquid fuel systemsii)heating coils in tanks7.13Hydrostatic Tests of Shell ValvesAll valves intended for installation on the side shell at or below the load waterline, including those at the sea chests, are to be hydrostatically tested in the presence of the Surveyor, before installation to a pressure of at least 5 bar (5.1 kgf/cm2, 72.5 psi).7.15Pneumatic Tests in Lieu of Hydrostatic TestsIn general, a pneumatic test in lieu of a hydrostatic test is not permitted. Where it is impracticable to carry out the required hydrostatic test, a pneumatic test may be considered. In such cases, the procedure for carrying out the pneumatic test, having regard to safety of personnel, is to be submitted to the Surveyor for review.PART 4MACHINERY AND SYSTEMSCHAPTER 2PUMPS AND PIPING SYSTEMSSECTION 3BILGE AND BALLAST SYSTEMS AND TANKS13Ballasting Systems for Column-Stabilized Units13.5Pumps13.5.2Pump Performance (2002)(Revise text as follows:)At least two pumps are to be capable of effectively emptying each intact tank at maximumnormal operating draft when the unit is subject to the conditions specified in 3-3-1/1.3.2.[Note: Loss of a pump(s) due to flooding of a pump room is to be considered in meeting thisrequirement.] Each of the pumps utilized in meeting the above requirement is to haveadequate head/capacity characteristics and available net positive suction head (NPSHa) tooperate at the angles of heel and trim associated with the conditions specified in 3-3-1/1.3.2 ata capacity of not less than 50% of the capacity required from that pump to meet the criteria of4-2-3/13.1.Pump data and calculations substantiating compliance with this requirement are to besubmitted. The use of submersible pumps will be subject to special consideration.PART 4VESSEL SYSTEMS AND MACHINERYCHAPTER 3ELECTRICAL INSTALLATIONSSECTION 2DRILLING UNIT SYSTEMS1Plans and Data to be Submitted1.7Load Analysis (2002)(Revise the text as follows:)An electric-plant load analysis is to be submitted for review. The electric-plant (including high voltage drilling unit main service transformers or converters, where applicable per 4-3-2/7.1.6) load analysis is to cover all operating conditions of the drilling unit, including normal sea-going (if applicable) and emergency operations.3Drilling Unit Main Service Source of Power3.1Power Supply by Generators3.1.2Capacity of Generators (2002)In addition to 4-3-2/3.1.1, the capacity of the generator sets is to be sufficient to maintain thedrilling unit in normal operational and habitable conditions, excluding drilling equipment,with any one main generator in reserve. The capacity of main generators is to be determinedwithout recourse to the emergency source of power. See 4-3-2/5 for emergency power sourcerequirements. Also, for self-propelled drilling units, the generating sets are to be such thatwith any one generator or its primary source of power out of operation, the remaininggenerating sets are capable of providing the electrical services necessary to start the mainpropulsion plant from a dead ship (blackout) condition.3.1.4Starting from Dead Ship Condition (2002)(Revise and add text as follows:)Dead ship condition is the condition, for self-propelled drilling units, under which the mainpropulsion plant, boiler and auxiliaries are not in operation due to unavailability of powerfrom the main power source. See 4-1-1/11.In restoring the propulsion, no stored energy for starting the propulsion plant, the main sourceof electrical power and other essential auxiliaries is to be assumed available. It is assumed thatmeans are available to start the emergency generator at all times.The emergency source of electrical power may be used to restore the propulsion, provided itscapability either alone or combined with that of any other source of electrical power issufficient to provide at the same time those services required to be supplied by 4-3-2/5.3ii) to4-3-2/5.3iii).The emergency generator and other means needed to restore the propulsion are to have acapacity such that the necessary propulsion starting energy is available within 30 minutes ofdead ship (blackout) condition as defined above. Emergency generator stored starting energyis not to be directly used for starting the propulsion plant, the main source of electrical powerand/or other essential auxiliaries (emergency generator excluded).See also 4-3-2/3.1.2 above.7Distribution System7.1Drilling Unit Main Service Distribution System7.1.6Power Supply Through Transformers and Converters(Revise and add text as follows:)7.1.6(a)Continuity of Supply. Where transformers or converters are an essential part of thepropulsion or drilling unit main service electrical supply system, the system is to be soarranged as to ensure at least the same continuity of the supply as required by 4-3-2/3.1.2 forgenerators.7.1.6(b)Arrangements. (2002) Each required transformer is to be located as a separate unitwith separate enclosure or equivalent, and is to be served by separate circuits on the primaryand secondary sides. Each of the secondary circuits is to be provided with a multipoleisolating switch. This multipole isolating switch is not to be installed on the transformercasing or its vicinity (in so far as practicable) to preclude its damage by fire or other incidentat the transformer. A circuit breaker provided in the secondary circuit in accordance with4-3-2/9.15.1 will be acceptable in lieu of the multipole isolating switch.PART 4VESSEL SYSTEMS AND MACHINERYCHAPTER 3ELECTRICAL INSTALLATIONSSECTION 3DRILLING UNIT INSTALLATION9Equipment and Installation in Hazardous Area9.1General Consideration9.1.4Lighting Circuits (2002)(Add text as follows:)All switches and protective devices for lighting fixtures in hazardous areas are to interrupt allpoles or phases and are to be located in a non-hazardous area. However, a switch may belocated in a hazardous area if the switch is of a certified safe type for the hazardous locationin which it is to be installed. On solidly grounded distribution systems, the switches need notto open the grounded conductor. The switches and protective devices for lighting fixtures areto be suitably labeled for identification purposesPART 4VESSEL SYSTEMS AND MACHINERYCHAPTER 3ELECTRICAL INSTALLATIONSSECTION 4MACHINERY AND EQUIPMENT9Transformers9.5Construction and Assembly(Add new subparagraph 4-3-4/9.5.4 as follows:)9.5.4Prevention of the Accumulation of Moisture (2002)Transformers of 10 kVA/phase and over are to be provided with effective means to preventaccumulation of moisture and condensation within the transformer enclosure where thetransformer is disconnected from the switchboard during standby (cold standby). Where it isarranged that the transformer is retained in an energized condition throughout a period ofstandby (hot standby), the exciting current to the primary winding may be considered as ameans to meet the above purpose. In case of hot standby, a warning plate is to be posted at ornear the disconnecting device for the primary side feeder to the transformer.PART 4VESSEL SYSTEMS AND MACHINERYCHAPTER 3ELECTRICAL INSTALLATIONSSECTION 5SPECIALIZED INSTALLATIONS1High Voltage Systems1.3System Design(Add new Subparagraph 4-3-5/1.3.7 as follows:)1.3.7Number and Capacity of Transformers (2002)The number and capacity of transformers is to be sufficient, with any three-phase transformeror any one transformer of three single phase transformer bank out of service, to carry thoseelectrical loads for essential service and for minimum comfortable conditions of habitability.For this purpose, and for the purpose of immediate continuity of supply, the provision of asingle-phase transformer carried onboard as a spare for a three phase transformer bank or V-Vconnection by two remaining single-phase transformers, is not acceptable.1.7Protection1.7.2Power Transformers (2002)(Add text as follows:)If the total connected load of all outgoing circuits of the transformer secondary side exceedsthe rated load, an overload protection or an overload alarm is to be fitted.Each high-voltage transformer intended to supply power to the low-voltage drilling unit mainservice switchboard is to be protected in accordance with 4-3-2/9.15. In addition, thefollowing means for protecting the transformers or the electric distribution system are to beprovided:1.7.2(a)Coordinated trips of protective devices. Discriminative tripping is to be provided forthe following. See 4-3-2/9.1.5.i)between the primary side protective device of the transformer and the feederprotective devices on the low-voltage drilling unit main service switchboard, or ii)between the secondary side protective device of the transformer, if fitted, and the feeder protective devices on the low-voltage drilling unit main service switchboard.1.7.2(b)Load shedding arrangement. Where the power is supplied through a single set ofthree-phase transformer to a low-voltage drilling unit main service switchboard, automaticload shedding arrangements are to be provided when the total load connected to the lowvoltage drilling unit main service switchboard exceeds the rated capacity of the transformer.See 4-3-2/1.7 and 4-3-2/9.3.3.1.7.2(c)Protection from electrical disturbance. Means or arrangements are to be providedfor protecting the transformers from voltage transients generated within the system due tocircuit conditions, such as high-frequency current interruption and current suppression(chopping) as the result of switching, vacuum cartridge circuit breaker operation, or thyrister-switching.An analysis or data for the estimated voltage transients is to be submitted to show that theinsulation of the transformer is capable of withstanding the estimated voltage transients. See4-3-5/1.11.3(b).1.7.2(d)Detection of phase-to-phase internal faults. For three-phase transformers of 100kVA or more, means for detecting a phase-to-phase internal fault are to be provided. Thedetection of the phase-to-phase internal fault is to activate an alarm at the manned controlstation or to automatically disconnect the transformer from the high-voltage powerdistribution network.1.7.2(e)Protection from earth-faults. Where a Y-neutral of three-phase transformerwindings is earthed, means for detecting an earth-fault are to be provided. The detection ofthe earth fault is to activate an alarm at the manned control station or to automaticallydisconnect the transformer from the high-voltage power distribution network.1.7.2(f)Transformers arranged in parallel. When transformers are connected in parallel,tripping of the protective devices at the primary side is to automatically trip the switch orprotective devices connected at the secondary side.1.11Machinery and Equipment1.11.3Transformers (2002)(Revise and add text as follows:)1.11.3(a)Application. Provisions of 4-3-5/1.11.3 are applicable to power transformers foressential services. See also 4-3-4/9. Items 4-3-5/1.11.3(c) and 4-3-5/1.11.3(d) are applicableto transformers of the dry type only. These requirements are not applicable to transformersfor the following services:Instrument transformers.Transformers for static converters.Starting transformers.1.11.3(b)Plans. In addition to the details required in 4-3-4/9, the applicable standard ofconstruction and the rated withstanding voltage of the insulation are also to be submitted forreview.1.11.3(c)Enclosure. Transformers are to have a degree of protection of at least IP44.However, when installed in spaces accessible to qualified personnel only, the degree ofprotection may be reduced to IP2X. For transformers not contained in enclosures, see4-3-5/1.9.1.1.11.3(d)Space heater. Effective means to prevent accumulation of moisture andcondensation within the transformers (when de-energized) is to be provided.1.11.3(e)Testing. Three-phase transformers or three-phase bank transformers of 100 kVAand above are to be tested in the presence of the Surveyor. The test items are to be inaccordance with the standard applicable to the transformer. The tests are also to be carriedout in the presence of the Surveyor for each individual transformer. Transformers of less than100 kVA will be accepted subject to a satisfactory performance test conducted to thesatisfaction of the Surveyor after installation.Specific requirements are applicable for the following tests:i)In the dielectric strength test, the short duration power frequency withstand voltage tobe applied is to follow the standard applicable to the transformer but not less than theestimated voltage transient generated within the system. If the short duration powerfrequency withstand voltage is not specified in the applicable standard, IEC 60076-3is to be referred to. For the voltage transient, see4-3-5/1.7.2(c).ii)The induced over-voltage withstand test (layer test) is also to be carried out in accordance with the standard applicable to the transformers in the presence of theSurveyor. This test is intended to verify the power-frequency withstand strength alongthe winding under test and between its phase (strength between turns and betweenlayers in the windings). If the induced over-voltage withstand test is not specified inthe applicable standard, IEC 60076-3 is to be referred to.1.11.3(f)Nameplate. In addition to the requirements in 4-3-4/Table 4c, the followinginformation is also to be indicated on the nameplate:Applicable standardShort duration power frequency withstand voltage for verification of insulation levelof each windingPART 4MACHINERY AND SYSTEMSCHAPTER 4FIRE EXTINGUISHING SYSTEMSSECTION 1EQUIPMENT AND SYSTEMS15Gas Smothering15.1General15.1.1Storage (2002)(Revise text as follows:)Where the gas smothering medium is stored outside the protected space, the storeroom is tobe situated in a safe and readily accessible position and is to be effectively ventilated by aventilation system independent of all other spaces.(Add new text as follows:)Spaces for storage of cylinders or tanks for extinguishing gas should not be used for otherpurposes. These spaces should not be located forward of the forward collision bulkhead.Access to these spaces should be possible from the open deck. Spaces situated below the deckshould be located no more than one deck below the open deck.Spaces where entrance from the open deck is not provided or which are located below deckare to be fitted with mechanical ventilation. The exhaust duct (suction) should be lead to thebottom of the space. Such spaces should be ventilated with at least 6 air changes per hour.。