MODU Part 4 E-July13

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P a r t 4 : M a c h i n e r y a n d S y s t e m s

RULES FOR BUILDING AND CLASSING

MOBILE OFFSHORE DRILLING UNITS

2012

PART 4MACHINERY AND SYSTEMS

American Bureau of Shipping

Incorporated by Act of Legislature of

the State of New York 1862

Copyright 2011

American Bureau of Shipping

ABS Plaza

16855 Northchase Drive

Houston, TX 77060 USA


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ii ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS .2012

R u l e C h a n g e N o t i c e ( 2 0 1 2 )

Rule Change Notice (2012)

The effective date of each technical change since 1993 is shown in parenthesis at the end of the

subsection/paragraph titles within the text of each Part. Unless a particular date and month are shown, theyears in parentheses refer to the following effective dates:

(2000)and after 1 January 2000 (and subsequent years) (1996) 9 May 1996

(1999) 12 May 1999 (1995) 15 May 1995

(1998) 13 May 1998 (1994) 9 May 1994

(1997) 19 May 1997 (1993) 11 May 1993

Listing by Effective Dates of Changes from the 2008 Rules

Notice No. 1 (effective on 1 January 2009), Notice 2 (effective on 1 July 2009), Notice 3 (effective on1 January 2010), and Notice No. 4 (effective on 1 January 2011) which are incorporated in the 2012 Rules,

are summarized below.

EFFECTIVE DATE 1 January 2009 shown as (2009)(based on the contract date for new construction between builder and Owner)

Part/Para. No. Title/Subject Status/Remarks

PART 4 Machinery and Systems

4-1-1/Table 2 Ambient Temperatures for

Unrestricted Service

To base acceptance of materials for machinery on specified minimum

identified air and sea temperatures. (Incorporates Notice No. 1)

4-2-6/5.5.1(e)

(New)

Flexible Hoses To provide requirements governing the use of flexible hoses in fixed

oxygen-acetylene systems. (Incorporates Notice No. 1)

4-2-6/9.3.3

(New)

Non Self-Propelled Units To clarify the starting air requirements for non self propelled units.

(Incorporates Notice No. 1)

4-3-2/3.1.2 Capacity of Generators To clarify that after the emergency generator has been started (after a

blackout), other machinery must be used in conjunction with theremaining main generators in order to start the propulsion machinery.(Incorporates Notice No. 1)

4-3-2/3.1.4 Starting from Dead Ship Condition To clarify that some sources of power are assumed not to be availableand that the requirement would also be applicable to vessels with

emergency batteries (with no emergency generator). (IncorporatesNotice No. 1)

4-3-2/5.3 Emergency Power Supply To clarify the requirements. (Incorporates Notice No. 1)

4-3-2/5.7 Transitional Source of Power To align the requirements for the minimum emergency services requiredto be supplied by the transitional source of power with 5.3.10 of the

IMO MODU Code. (Incorporates Notice No. 1)

4-3-2/Table 1 Alarms and Safeguards for

Emergency Diesel Engines

To provide clarification between the requirements in 4-3-2/Table 1 and

those in 4-2-1/7.2 of the Steel Vessel Rules. (Incorporates Notice No. 1)4-3-2/7.9 Harmonics To align the requirements with 4.9.2.2. of IEC 61892-1. (Incorporates

Notice No. 1)

4-3-2/17.1.2 System Requirements To clarify the requirement for two separate feeders, to require an alarm

when there is a loss of power in any one of the feeders, and to clarifyan acceptable alternative arrangement when one feeder with a batteryis provided. (Incorporates Notice No. 1)

4-3-2/19.1.2 Other Auxiliaries To align the requirements with Chapter 9.10.2 of the IMO MODU

Code. (Incorporates Notice No. 1)

4-3-4/7.9.7 Terminals To align the requirements with current practice. (Incorporates NoticeNo. 1)


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ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS.2012 iii

EFFECTIVE DATE 1 July 2009 shown as (1 July 2009)(based on the contract date for new construction between builder and Owner)



4-2-2/7.9 Manufacturing of Plastic Pipes To allow for consideration of the requirements in recognized standardsfor plastic pipe manufacturing. (Incorporates Notice No. 2)

4-2-2/19 Fluid Power Cylinders To clarify the requirements and align them with the Steel Vessel Rules.(Incorporates Notice No. 2)

4-3-3/5.17.3(New)

Electrical Cables for the EmergencyFire Pump

To align the requirements with IMO MSC Circular 1120.(Incorporates Notice No. 2)

5-2-3/5.11 Fixed High Expansion Foam Systems To reflect the use of MSC.1/Circ.1271 for High-Expansion Foam

Systems that utilize inside air. (Incorporates Notice No. 2)

5-2-4/Table 1 Classification of Portable and Semi-portable Extinguishers

To align the requirements with Chapter 4, Paragraph 3.1.1.1 of theIMO FSS Code and to remove application of Halon fire extinguishers.


5-2-4/Table 2 Hand Portable Fire Extinguishers and

Semi-portable Fire-ExtinguishingSystems

To align the requirements with Chapter 4, Paragraph 3.1.1.1 of the

IMO FSS Code. (Incorporates Notice No. 2)




4-2-3/1.1 Tank Vents and Overflows General To align the requirements with Regulation 20 of the InternationalConvention on Load Lines (Incorporates Notice No. 3)

4-2-3/1.5 Height and Wall Thickness of Vent

Pipes

To align the requirements with Regulation 20 of the International

Convention on Load Lines and IACS UI LL36. (Incorporates Notice

No. 3)

4-2-3/1.9.5 Vent Outlet Closing Devices To incorporate requirements for the vent closing devices in line withIACS UR P3. (Incorporates Notice No. 3)

4-2-5/11(New)

Additional Measures for Oil PollutionPrevention

To incorporate requirements protection of fuel oil tanks in line withRegulation 12A, Annex I, MARPOL 73/78, as amended.


4-2-5/13(New)

Class Notation POT To recognize enhanced pollution prevention compliance of mobileoffshore drilling units. (Incorporates Notice No. 3)

4-2-6/5.5.1(b) Piping Materials To align the requirements with NFPA 51, USCG Title 46 CFR 56.50-103,

and BS 29593/ISO 9539. (Incorporates Notice No. 3)

4-3-1/Table 4 Primary Essential Services To incorporate additional services required to be ABS certified.(Incorporates Notice No. 3)

4-3-1/Table 5 Secondary Essential Services To incorporate additional services required to be ABS certified.(Incorporates Notice No. 3)

4-3-3/3.1.1(b) Equipment in Areas Protected by

Local Fixed Pressure Water-sprayingor Local Water-mist Fire

Extinguishing System in MachinerySpaces

To clarify that the requirement for a degree of protection not less than

IP 44 will apply only to electrical and electronic equipment intendedfor essential services when affected by the discharge of local application

water-spray or water mist fire extinguishing systems. (IncorporatesNotice No. 3)

4-3-4/1 Plans and Data to Be Submitted To clarify the requirements for essential machines of 100 kW and over.


4-3-4/3.1.1 Applications To document that rotating machines for services indicated in 4-3-4/Table11 require ABS certification. (Incorporates Notice No. 3)

4-3-4/7.1.1 Applications To document that motor controllers, and motor control centers for services

indicated in 4-3-4/Table 11 require ABS certification. (IncorporatesNotice No. 3)


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4-3-4/13.1.1 General To clarify the requirements regarding cable glands designed for use inhazardous areas. (Incorporates Notice No. 3)

4-3-4/Table 11

(New)

Additional Services Requiring

Electrical Equipment to be Designed,

Constructed and Tested to theRequirements in Section 4-3-4

To incorporate additional services required to be ABS certified.





4-1-1/9 Plans and Data to be Submitted To align the plan submission requirements with current ABS practice.


4-1-1/15 Ambient Temperature To clarify that, for unrestricted service, the offshore unit is to be designedfor an ambient temperature of 0C (32F) or lower. (Incorporates

Notice No. 4)

4-1-1/17 Materials Containing Asbestos To align the requirements with IMO Res. MSC.282(86), adoptingSOLAS Reg II-1/3-5.2, which prohibits installation of materials

containing asbestos on all ships or units (both new construction andexisting vessels) after 1 January 2011. (Incorporates Notice No. 4)

Section 4-1-3 Jacking and Associated Systems To update the requirements for jacking systems per the Jacking System

Ad-hoc Group, formed by ABS and industry representatives.(Incorporates Notice No. 4)

4-2-2/3.1 General Requirements To require that pumps used in fixed water-based, or equivalent, local

application fire-fighting systems and the sprinkler system pump are tobe also certified by the Surveyor at the manufacturers plant.


4-2-2/21.3 Valve Connections to Shell To align the requirements with other ABS Rules. (IncorporatesNotice No. 4)

4-2-3/1.1 General To clarify the requirements regarding shutoff valves or closing devicesin vent piping. (Incorporates Notice No. 4)

4-2-4/1.1 General To align the alternative bilge requirements for small compartments in

surface-type units with the Steel Vessel Rules. (Incorporates Notice No. 4)

4-2-4/1.5 Direct Bilge Suctions To require a direct bilge suction to be fitted with a stop-check valve.(Incorporates Notice No. 4)

4-2-4/1.7 Emergency Bilge Suctions To clarify the requirements for emergency bilge suctions.


4-2-4/13.7.1(b) Controls and Indications To make a comprehensive list of control and indications required at

the centralized ballast control station. (Incorporates Notice No. 4)

4-2-5/1.1.1 Tanks To incorporate requirements of IMO MSC.1/Circ.1322, which requiresthat boundary area of a fuel oil tank that is common with machineryspaces of category A be kept to a minimum. (Incorporates Notice No. 4)

4-2-5/Figure 1 Acceptable Fuel Oil TanksArrangements Inside Category AMachinery Spaces

To incorporate requirements of IMO MSC.1/Circ.1322, which requiresthat boundary area of a fuel oil tank that is common with machineryspaces of category A be kept to a minimum. (Incorporates Notice No. 4)

4-2-5/1.1.2 Spillage To incorporate requirements of IMO MSC.1/Circ.1322, which requiresthat boundary area of a fuel oil tank that is common with machinery

spaces of category A be kept to a minimum. (Incorporates Notice No. 4)

4-2-5/3.9 Valves on Oil Tanks To clarify that the use of an electric, hydraulic or pneumatic system to

keep the valve directly in the open position is not acceptable for tanks

supplying fuel to diesel engines for essential or emergency services.(Incorporates Notice No. 4)


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4-2-6/1.1 General To remove the necessity of remote closure on valves which are normallyclosed. (Incorporates Notice No. 4)

4-2-6/5.5.1(a) General To clarify that only high pressure oxygen and acetylene piping is to be

certified as Group I piping. (Incorporates Notice No. 4)

4-2-6/9.5 Protective Devices for Starting-airMains

To clarify that the protective devices for starting-air mains requirementapplies to the case where starting air is directly injected into cylinders.


4-3-2/9.1.4 Back-up Protection To clarify the specific requirements for back-up fuse arrangementsand cascade protection and to align theMODU Ruleswith the Steel

Vessel Rules. (Incorporates Notice No. 4)

4-3-2/9.13.5 Undervoltage Protection and

Undervoltage Release

To clarify that motors provided with undervoltage protection (UVP)

will not automatically restart upon restoration of normal voltage, aftera stoppage due to a low voltage condition or voltage failure condition.To clarify which motors are required to be provided with undervoltage

release. (Incorporates Notice No. 4)

4-3-2/15.5.4

(New)

Jacking System To require a voice communication system between the central jacking

control station and a location at each leg in self-elevating units.(Incorporates Notice No. 4)




4-1-1/1(New)

Requirements for Classification To define the scope of the several Parts of theMODU Rulesreferringto equipment, machinery and systems.

4-1-1/1.1.1

(New)

General To specify that the design and construction of general drilling equipment

are not subject to class requirements if they comply with a recognizedstandard.

4-1-1/1.1.2

(New)

Essential Systems to Unit Safety To identify safety systems and equipment needed to be reviewed and

surveyed even if they are located in drilling areas or related to drillingsystems and equipment.

4-1-1/1.1.3

(New)

References To provide references to other requirements applicable or related to

drilling systems and equipment.

4-1-1/3

(New)

Definitions To include definitions for terms used in Part 4.

4-1-1/5

(New)

Machinery Plans To add general information on submission of machinery plans in line

with Steel Vessel Rulesand other ABS Rules and Guides.

4-1-1/7.1 Inclinations To clarify the application of the requirements for angles of inclination.

4-1-1/Table 2 Ambient Temperatures for Machinery,Equipment and Appliances in Units

of Unrestricted Service

To clarify the terminology on temperatures.

4-1-1/7.13

(New)

Well Test Systems To clarify the application of the requirements for temporary and

permanent well test systems installed on board MODUs.

4-1-1/Table 3 Primary Essential Services To clarify the terminology on temperatures.

4-1-1/Table 4 Secondary Essential Services To align Primary Essential and Secondary Essential services with the

new definition introduced in 4-1-1/3.5.

4-1-2/1

(New)

Prime Movers To clarify requirements for certification of prime movers in line with

4-3-4/3 and the Steel Vessel Rules.

4-1-2/3First Paragraph

To specify that for drilling units without CDSnotation, internalcombustion engines used solely for drilling operations need not be of

approved type and need not be inspected at the plant of manufacture.


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4-1-2/3.9 Governor Control To reference requirements for operating governors of generator primemovers in Section 6-1-3.

4-1-2/9

(New)

Electrical Machinery and Equipment To clarify location of requirements for electrical machinery and

equipment.

4-1-2/11(New)

Certification of Machinery andEquipment

To clarify location of requirements for certification of machinery andequipment.

4-2-1/3(New)

Definitions To add the definitions applicable to piping systems and to harmonizedefinitions of pressures and temperatures and updated throughout the

text.

4-2-1/5 Classes of Piping Systems To update the piping Groups I and II to the piping Classes I, II and III

used in other ABS Rules.

4-2-1/7.1 Plans To update the piping Groups I and II to the piping Classes I, II and III


4-2-1/11.7.1 Circulating Water Systems To clarify that molded expansion joints are permitted only in Class IIIsea water piping systems, in line with the Steel Vessel Rules.

4-2-1/11.7.2(b) To clarify that the maximum working pressure of the system and not

the MAWP is to be lower than the design pressure of the expansion

joint determined by the burst test.

4-2-1/11.7.3 Fire Resistant Test To clarify that maximum service pressure means maximum working

pressure of the system and that ISO 15540 and ISO 15541 can be usedfor this test, as the criteria are identical.

4-2-1/11.9(New)

Metallic Bellow Type ExpansionJoints

To add requirements for metallic bellow type expansion joints in linewith the Steel Vessel Rules.

4-2-1/11.11

(New)

Pipe Joints To add requirements for pipe joints in line with the Steel Vessel Rules.

4-2-1/11.13(New)

Mechanical Joints To add requirements for mechanical joints in line with the Steel VesselRules.

4-2-1/11.29 Flexible Hoses To align the requirements with the Steel Vessel Rulesand to clarifythat ISO 15540 and ISO 15541 can be used for this test, as the criteriaare identical.

4-2-1/11.33.2 Boiler Flats To align the requirements with industry practice as the original IACSrequirement in this regard (UR F35.2.1.4.2) is no longer applied by

IACS.

4-2-2/3

(New)

Certification of Piping Components To clarify location of requirements for certification of piping components.

4-2-2/5.1 Steel Pipe To update the piping Groups I and II to the piping Classes I, II and III


4-2-2/5.7.1 Design Pressure and MinimumThickness

To clarify that the equations determine the design pressure as definedin 4-2-1/3.17 and that in the note, the actual working pressure is the

actual maximum working pressure as defined in 4-2-1/3.19.

4-2-2/5.9 Design Pressure and Thickness

Alternative Consideration

To clarify that the equations determine the design pressure as defined

in 4-2-1/3.17.

4-2-2/Table 1 Allowable Stress Values Sfor Piping To clarify terminology on temperature.

4-2-2/7.5.1 Internal Pressure To use the terminology defined in 4-2-1/3.19.

4-2-2/7.5.4 Temperature To clarify terminology on temperature.

4-2-2/7.7.1 Supports To clarify terminology on temperature.

4-2-2/7.9 Manufacturing of Plastic Pipes To use the terminology defined in 4-2-1/3.17.

4-2-2/7.13.4(b) To use the terminology defined in 4-2-1/3.17.

4-2-2/7.15.4(b) To use the terminology defined in 4-2-1/3.17.

4-2-2/9.3 Construction To update the piping Groups I and II to the piping Classes I, II and III

used in other ABS Rules and to clarify the meaning of maximumpressure as maximum working pressure.


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4-2-2/11.1 General To update the piping Groups I and II to the piping Classes I, II and IIIused in other ABS Rules and to clarify terminology on pressure and

temperature.

4-2-2/15 Flanges To update the piping Groups I and II to the piping Classes I, II and III


4-2-2/19.1 General To use the terminology defined in 4-2-1/3.17.

4-2-2/19.3 Non-compliance with a RecognizedStandard

To use the terminology defined in 4-2-1/3.17.

4-2-2/19.11 Exemptions To clarify the exemption of compliance with the Rule requirements

when the fluid power cylinders are not within the scope of classification.

4-2-2/21.3 Valve Connections to Shell To clarify the requirements.

4-2-3/1.9.3 Protection for Fuel Oil and

Lubricating Oil Tanks

To align the requirements with 4.8.5 of the 2009 IMO MODU Code.

4-2-4/1.1 General To clarify the definition of comparatively small compartments.

4-2-4/5.5 Manifolds, Cocks and Valve To align the requirements with the 2009 IMO MODU Code.

4-2-4/9.1.2 Branch Lines To adjust the intent of the requirement for small compartments.

4-2-4/13.5.2 Pump Performance To align the requirements with 4.10.4 of the 2009 IMO MODU Code.

4-2-4/13.7.1(b) Controls and Indications To align the requirements with 4.10.10 of the 2009 IMO MODU Code.

4-2-4/13.7.3(c) Disconnects To align the requirement with the 2009 IMO MODU Code, and to avoid

the ambiguity whether the pumps or the pumps control system are tobe disconnected from the power system.

4-2-4/13.7.4 Valve Position Indicating Systems To align the requirements with 4.10.17 of the 2009 IMO MODU Code.

4-2-5/1.1.4 Service and Settling Tanks To align the requirements with 4.8.6 of the 2009 IMO MODU Code.

4-2-5/9.1.3 To define conditions for use of low flash point fuel in emergencyservice prime movers.

4-2-6/3.1 General To update the piping Groups I and II to the piping Classes I, II and III

used in other ABS Rules and to clarify the exemption of compliancewith the Rules for hydraulic systems which are not within the scope of

classification.

4-2-6/3.17 Segregation of High Pressure HydraulicUnits

To use the terminology defined in 4-2-1/3.17.

4-2-6/5.5.1 General To update the piping Groups I and II to the piping Classes I, II and IIIused in other ABS Rules.

4-2-6/5.5.2 Pressure Relief Devices To use the terminology defined in 4-2-1/3.17.

4-2-6/25

(New)

Raw Water System for Self-Elevating

Units in Elevated Condition

To add requirements for raw water systems on self-elevating units in

elevated condition based on current ABS practice.

4-3-1/5 Plans and Data to Be Submitted To add a reference to the new paragraph for hazardous areas.

4-3-2/5.1.1 Basic Requirement To clarify the arrangement of the emergency generator auxiliary systems.

4-3-2/5.1.2 Boundary To align the requirements with 5.4.3 of the 2009 IMO MODU Code.

4-3-2/5.3First Paragraph

Emergency Power Supply To align the requirements with 4-8-2/5.5 of the Steel Vessel Rules.

4-3-2/5.3.1(f) To align the requirements with 5.4.6.1.8 of the 2009 IMO MODU Code.

4-3-2/5.3.1(h) To align the requirements with 5.4.6.1.8 of the 2009 IMO MODU Code.

4-3-2/5.3.3 Marking of Offshore Structures To align the requirements with 5.4.6.3 of the 2009 IMO MODU Code.

4-3-2/5.5.1 General To clarify that the angles of inclination referred to in this paragraph are

in static condition and that the minimum angles of inclination definedin 4-1-1/7.1 are also applicable in this case.

4-3-2/5.5.2 Generator To clarify the arrangement of the emergency generator auxiliary systems

and the use of low flashpoint fuels.


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4-3-3/1.5 Electrical Equipment in HazardousAreas

To add reference to hazardous areas definition.

4-3-3/3.5.4 Motors Below Decks To clarify that the suitability of the location where motors are installed

below deck will be verified by the attending Surveyor.

4-3-3/9.1.1 General To align the requirements with 6.6.1 and 6.6.2 of the 2009 IMO MODUCode.

4-3-3/9.1.2 Electrical Equipment To align the requirements with 6.6.3 and 6.6.4 of the 2009 IMO MODUCode, except that certified electrical equipment other than the types

listed under 4-3-3/9.1.2(b) will need special consideration.

4-3-3/9.1.3

(New)

Grouping and Temperature Class To align the requirements with 6.6.5, 6.6.6 and 6.6.7 of the 2009 IMO

MODU Code.

4-3-3/Table 1 Minimum Degree of Protection To clarify the degree of protection required for the remote closure and

monitoring of watertight doors, when the electrical equipment is belowthe worst damage waterline.

4-3-4/5(New)

Computer Based Systems To align the requirements with 4-8-3/15 of the Steel Vessel Rules.

4-3-5/3.17.3

(New)

Cooling Systems for Machinery and

Equipment

To make reference to cooling system requirements in Section 6-1-7.

4-3-5/7.1.1

(New)

Machinery Associated with Dynamic

Positioning System


4-3-6/1.1 Hazardous Areas To align the requirements with 6.1 of the 2009 IMO MODU Code.

4-3-6/5.1 Hazardous Areas Zone 0 Include To align the requirements with 6.2.2 of the 2009 IMO MODU Code.

4-3-6/5.3vi)(New)


4-3-6/5.5vi) To align the requirements with 6.2.4 of the 2009 IMO MODU Code.

4-3-6/7.1i) To align the requirements with 6.3.1.1 of the 2009 IMO MODU Code.

4-3-6/7.5i) To align the requirements with 6.3.1.3 of the 2009 IMO MODU Code.4-3-6/7.7

(New)

Ventilation Alarms To clarify the requirements for ventilation alarms related to hazardous

areas based on IEC 60092-502.

4-3-6/7.9(New)

Hold-back Devices To align the requirements with 6.3.3 of the 2009 IMO MODU Code.

4-3-6/9.3 Ventilation of Hazardous Areas To align the requirements with 6.4.1 of the 2009 IMO MODU Code.

4-3-6/11 Machinery Installations in HazardousAreas

To clarify the requirements. To add reference for requirements ofelectrical equipment and wiring in hazardous areas. To add paragraph

to require safety devices in order to prevent overspeeding of internalcombustion engines due to ingestion of flammable gas through the air

intake. The distance of 15 m (50 ft) is based on API RP 505 for potentialrelease of large amounts of gas, equivalent to the case of loadingterminals.


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P A R T T a b l e o f C o n t e n t s

4Machinery and Systems

CONTENTS

CHAPTER 1 Machinery, Equipment and Systems.................................................... 1

Section 1 General .................................................................................. 3

Section 2 Machineryand Equipment..................................................... 9

CHAPTER 2 Pumps and Piping Systems ................................................................ 12

Section 1 General ................................................................................ 18Section 2 Pumps, Pipes, Valves, and Fittings ..................................... 27

Section 3 Tank Vents and Overflows ................................................... 50

Section 4 Bilge and Ballast Systems and Tanks ................................. 56

Section 5 Fuel Oil Systems and Tanks ................................................ 64

Section 6 Other Piping Systems and Tanks ........................................ 71

CHAPTER 3 Electrical Installations ......................................................................... 81

Section 1 General ................................................................................ 87

Section 2 ElectricalSystems ................................................................ 93

Section 3 OnboardInstallation ........................................................... 116

Section 4 Machinery and Equipment ................................................. 136

Section 5 Specialized Installations .................................................... 143

Section 6 Hazardous Areas ............................................................... 155


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P A R T C h a p t e r 1 : M a c h i n e r y , E q u i p m e n t , a n d S y s t e m s

4C H A P T E R 1 Machinery, Equipment and Systems

CONTENTS

SECTION 1 General .................................................................................................... 31 Requirements for Classification .......................................................... 3

1.1 Drilling Systems and Equipment ...................................................... 33 Definitions ........................................................................................... 4

3.1 Control Station ..................................................................... ............ 43.3 Machinery Space ................................................................. ............ 43.5 Essential Services ............................................................... ............ 53.7 Hazardous Areas ................................................................. ............ 53.9 Dead Ship Condition ........................................................... ............ 53.11 Blackout .................................................................... ....................... 53.13 Definitions for Piping Systems ......................................................... 53.15 Definitions for Electrical Installations ............................................... 5

5 Machinery Plans ................................................................................. 65.1 Submission of Plans ............................................................ ............ 65.3 Plans ................................................................................... ............ 65.5 Additional Notations ........................................................................ 6

7 Miscellaneous Requirements for Machinery ....................................... 67.1 Inclinations ............................................................... ....................... 67.3 Dead Ship Start ................................................................... ............ 67.5 Unattended Machinery Spaces ....................................................... 77.7 Ambient Temperature .......................................................... ............ 77.9 Materials Containing Asbestos ........................................................ 77.11 Materials and Welding for Machinery Components ......................... 77.13 Well Test Systems ............................................................... ............ 7

TABLE 1 Angle of Inclination .................................................................... 6TABLE 2 Ambient Temperatures for Machinery, Equipment and

Appliances in Units of Unrestricted Service .............................. 7TABLE 3 Primary Essential Services ....................................................... 8TABLE 4 Secondary Essential Services .................................................. 8

SECTION 2 Machinery and Equipment ..................................................................... 91 Prime Movers ...................................................................................... 93 Internal Combustion Engines Designed for Drilling Operations ......... 9

3.1 Crankcase Ventilation ..................................................................... 93.3 Explosion Relief Valves ................................................................. 103.5 Fire Extinguishing Systems for Scavenge Manifolds ..................... 103.7 Warning Notices .................................................................. .......... 103.9 Governor Control ................................................................. .......... 10


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P A R T S e c t i o n 1 : G e n e r a l


S E C T I O N 1 General

1 Requirements for Classification (2012)

Part 4 contains general requirements for machinery, equipment and systems (Chapter 1) and the design

requirements for piping systems (Chapter 2) and electrical systems (Chapter 3).

Part 5 contains the design requirements for safety systems, including fire extinguishing systems.

Part 6 contains the design, testing and survey requirements for the certification of equipment, machineryand system components at vendors shop.

Part 7 contains the survey requirements during construction of units at builders yard (Chapter 1) and therequirements for periodical surveys after construction (Chapter 2).

1.1 Drilling Systems and Equipment

1.1.1 General

Unless CDSnotation is requested, systems and equipment used solely for drilling operations arein general not subject to Classification by ABS, provided they are designed and constructed in

compliance with an applicable recognized standard. Reference is made to the list of typicalrecognized standards in Appendix 1 of the ABS Guide for the Classification of Drilling Systems.

A manufacturers affidavit or other acceptable documentation to verify compliance with applicablerecognized standards is to be made available to ABS upon request. Refer to 6-1-1/1.3.

Drilling systems and equipment that do not comply with an applicable recognized standard or that

will be installed in a unit with CDSnotation are to comply with the ABS Guide for the Classificationof Drilling Systems.

1.1.2 Essential Systems to Unit Safety

Irrespective of whether CDSnotation is requested or not, the following safety systems and equipmentwhen in drilling areas or related to drilling operations are to be in accordance with the requirements

of these Rules:

Hazardous area classification

Electrical system circuit protection

Electrical installations in classified areas

Paint lockers, laboratory spaces and flammable material store rooms

Emergency services

Fire water system

Fixed fire fighting systems, as applicable

Portable and semi-portable extinguishers

Emergency control stations

Fire detection and alarm systems


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Part 4 Machinery and SystemsChapter 1 Machinery, Equipment and SystemsSection 1 General 4-1-1

4 ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS.2012

Flammable gas detection and alarm systems

Structural fire protection

Means of escape

1.1.3 References1.1.3(a) Essential Services. For essential services related to drilling systems and equipment, see4-1-1/3.5 and 4-1-1/Tables 3 and 4.

1.1.3(b) Well Test Systems. For requirements covering well test systems, see 4-1-1/7.13.

1.1.3(c) Internal Combustion Engines for Drilling Operations. For requirements covering internal

combustion engines designed for drilling operation, see 4-1-2/3.

1.1.3(d) Internal Combustion Engines installed in Hazardous Areas. For requirements coveringthe installation of internal combustion engines in hazardous areas, see 4-3-6/11.

1.1.3(e) Mud Tank Level Alarm. For requirements covering the mud tank level alarm, see 5-2-5/1.7.

1.1.3(f) Rotating Electrical Machines. For requirements covering the certification of rotating

electrical machines for essential services, see 6-1-7/5.

3 Definitions (2012)

3.1 Control Station

A location where controllers or actuator are fitted, with monitoring devices, as appropriate, for purposes of

effecting desired operation of specific machinery.

Control Station is defined exclusively for purposes of passive fire protection as intended by the IMO

MODU Code, in 5-1-1/3.9.2(1).

Centralized Control Stationis used in Part 4, Chapter 9 Remote Propulsion Control and Automation of the

Steel Vessel Rulesto refer to the space or the location where the following functions are centralized: Controlling propulsion and auxiliary machinery,

Monitoring propulsion and auxiliary machinery, and

Monitoring the propulsion machinery space.

3.3 Machinery Space

Machinery Spaceis any space that contains propulsion machinery, boilers, oil fuel units, steam and internal

combustion engines, generators and major electrical machinery, oil filling stations, air conditioning and

ventilation machinery, refrigerating machinery, stabilizing machinery or other similar machinery, includingthe trunks to the space. Machinery space is to include machinery space of category A, which, as defined

in 5-1-1/3.9.2(6), is a space and trunks to that space which contains:

Internal combustion machinery used for main propulsion; or

Internal combustion machinery used for purposes other than main propulsion where such machineryhas in the aggregate a total power output of not less than 375 kW (500 hp); or

Any oil-fired boiler (including similar oil-fired equipment such as inert gas generators, incinerators,waste disposal units, etc.) or oil fuel unit.


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3.5 Essential Services

Essential services are:

i) Those services considered necessary for:

Continuous operation to maintain propulsion and steering in self-propelled units (primary

essential services);

Systems of the drilling unit whose loss or failure would create an immediate danger to the unit(primary essential services);

Non-continuous operation to maintain propulsion and steering in self-propelled units and aminimum level of safety for the drilling units navigation and systems (secondary essential

services)

ii) Emergency services as described in 4-3-2/5.3 (each service is either primary essential or

secondary essential depending upon its nature, as described above); and

iii) Other special characteristics (e.g., special services) of the drilling unit whose loss or failure wouldcreate a potential danger to the unit (secondary essential services).

Examples of primary essential services and secondary essential services are as listed in 4-1-1/Table 3 and4-1-1/Table 4, respectively.

3.7 Hazardous Areas

Areas where flammable or explosive gases, vapors or dust are normally present or likely to be present areknown as hazardous areas. Hazardous areas are, however, more specifically defined for those areas where

the presence of flammable atmosphere arising from the drilling operations is possible or for certain

machinery installations and storage spaces that present such hazard, e.g.:

Helicopter refueling facilities, see 4-2-6/7.1.2

Paint stores, see 4-3-3/9.5

3.9 Dead Ship ConditionDead ship conditionmeans a condition under which:

i) The main propulsion plant, boilers and auxiliary machinery are not in operation due to the loss of

the main source of electrical power, and

ii) In restoring propulsion, the stored energy for starting the propulsion plant, the main source of

electrical power and other essential auxiliary machinery is assumed to be not available.

3.11 BlackoutBlackoutsituation means the loss of the main source of electrical power resulting in the main and auxiliarymachinery being out of operation.

3.13 Definitions for Piping SystemsFor definitions related to piping systems, refer to 4-2-1/3.

3.15 Definitions for Electrical InstallationsFor definitions related to electrical installations, refer to 4-3-1/3.


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5 Machinery Plans (2012)

5.1 Submission of Plans

Machinery and systems plans required by the Rules are generally to be submitted electronically by themanufacturer, designer or shipbuilder to ABS. However, hard copies will also be accepted. After review

and approval of the plans, one copy will be returned to the submitter, one copy will be retained for the useof the ABS Surveyor, and one copy will be retained by ABS for record. Where so stated in the

shipbuilding contract, the Owner may require the builder to provide copies of approved plans and relatedcorrespondence. A fee will be charged for the review of plans which are not covered by a contract of

classification with the shipbuilder.

In general, all plans are to be submitted and approved before proceeding with the work.

5.3 Plans

Machinery and systems plans required to be submitted for review and approval by ABS are listed in each

of the sections in Part 4. In general, equipment plans are to contain performance data and operationalparticulars; standard of compliance where standards are used in addition to, or in lieu of, the Rules;

construction details such as dimensions, tolerances, welding details, welding procedures, materialspecifications, etc.; and engineering calculations or analyses in support of the design. System plans are to

contain a bill of material with material specifications or particulars, a legend of symbols used, system

design parameters, and are to be in a schematic format. Booklets containing standard shipyard practices ofpiping and electrical installations are generally required to supplement schematic system plans.

5.5 Additional Notations

In the case of drilling units for which additional class notations covered by other ABS Rules and Guides

have been requested, machinery and systems plans related to the services covered by the additional class

notations are required to be submitted for review and approval by ABS as indicated in the correspondingRules and Guides.

7 Miscellaneous Requirements for Machinery

7.1 Inclinations (2012)

All machinery, components and systems foressentialservices, as defined in 4-1-1/3.5,are to be designed

to operate under the inclinations as indicated for each of the conditions listed in 4-1-1/Table 1.

TABLE 1Angle of Inclination (1995)

Condition Static Dynamic

Column-Stabilized Units 15 in anydirection 22.5 in anydirection

Self-Elevating Units 10 in any

direction

15 in any

direction

Surface Units 15 list and 5 trim

simultaneously

22.5 rolling and 7.5 pitching

simultaneously

7.3 Dead Ship Start(2005)Means are to be provided to bring the machinery into operation from a dead ship condition, as defined in

4-1-1/3.11. See 4-3-2/3.1.4 and 4-3-3/3.27 for the required starting arrangements.


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7.5 Unattended Machinery Spaces

Controls necessary for safe operation are to be provided for machinery in spaces which are not normally

manned. Relevant data is to be submitted to permit the assessment of the effect of such controls on thesafety of the unit. See 4-2-4/3.7 for bilge alarm systems and 5-3-1/15 for fire precautions for such spaces.

7.7 Ambient Temperature (2011)For drilling units of unrestricted service, ambient temperature, as indicated in 4-1-1/Table 2, is to be considered

in the selection and installation of machinery, equipment and appliances. For drilling units of restricted or

special service, the ambient temperature appropriate to the special nature is to be considered. See 3-1-4/1.9.

TABLE 2Ambient Temperatures for Machinery, Equipment and Appliances

in Units ofUnrestricted Service (2012)

Location Range of Temperature

Air Enclosed spaces (1, 2) 0 to 45C

Open deck (1,3) 25 to 45C

Temperature

Seawater 32C

Notes:1 Electronic equipment is to be suitable for operations even with an air temperature of 55C. See also 4-3-1/17.3.

2 Electrical equipment in machinery spaces is to be designed for 45C, except that electric generators and motors are

to be designed for 50C. Electrical equipment outside machinery space may be designed for 40C.

3 (2012)The minimum air temperature need not be less than the servicetemperature identified for the unit (see 3-1-4/1.9and 3-1-2/1)and documented in the unit's OperatingManual as per 1-1-5/1 of the MODU RulesSupplement to the

ABSRules for Conditions of Classification Offshore Units and Structures (Part 1), except for electrical, controland monitoring equipment associated with essential services.

7.9 Materials Containing Asbestos (2011)

Installation of materials, which contain asbestos, is prohibited.

7.11 Materials and Welding for Machinery Components (2012)

Materials used in the construction of the machinery of drilling units are to be in accordance with the ABS

Rules for Materials and Welding (Part 2).

For welding procedures and details for machinery components, see Section 2-4-2 of the ABS Rules for

Materials and Welding (Part 2).

7.13 Well Test Systems (2012)

Drilling units with a notation assigned under the ABS Guide for Well Test Systems are to be in fullcompliance with the applicable requirements of the Guide.

Drilling units without a notation assigned under the Guide are to comply with the requirements of Subsection3/19 of that Guide when temporary well test systems are installed on board (less than 30 months). No notation

will be added in such circumstances unless full compliance is demonstrated with the entire Section 3 of theGuide.

Drilling units fitted with permanent well test systems (30 months or more) are to comply with the requirements

of Section 4 of the Guide.


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TABLE 3Primary Essential Services (2012)

(a) Steering gears

(b) Pumps for controllable pitch propellers

(c) (2010)Scavenging air blower, fuel oil supply pumps, fuel valve cooling pumps, lubricating oil pumps and cooling waterpumps for main and auxiliary engines, turbines and shafting necessary for propulsion

(d) Ventilation necessary to maintain propulsion

(e) Forced draft fans, feed water pumps, water circulating pumps, vacuum pumps and condensate pumps for steam plants onsteam turbine drilling units, and also for auxiliary boilers where steam is used for equipment supplying primary essentialservices

(f) Oil burning installations for steam plants on steam turbine drilling units and for auxiliary boilers where steam is used forequipment supplying primary essential services

(g) Azimuth thrusters which are the sole means for propulsion/steering with lubricating oil pumps, cooling water pumps, etc.

(h) Electrical equipment for electric propulsion plant with lubricating oil pumps and cooling water pumps

(i) Electric generators and associated power sources supplying primary essential equipment

(j) Hydraulic pumps supplying primary essential equipment

(k) Viscosity control equipment for heavy fuel oil

(l) Control, monitoring and safety devices/systems of equipment for primary essential services.

(m) Services considered necessary to maintain dangerous spaces in a safe condition

(n) Blow-out preventer control systems

(o) Well control systems

(p) Dynamic positioning systems

(q) Ventilation systems necessary to maintain a safe atmosphere

(r) Elevating (jacking) systems

(s) Ballast control systems (on column stabilized units)

TABLE 4Secondary Essential Services (2012)

(a) Windlass

(b) Fuel oil transfer pumps and fuel oil treatment equipment

(c) Lubrication oil transfer pumps and lubrication oil treatment equipment

(d) Pre-heaters for heavy fuel oil

(e) Starting air and control air compressors

(f) Bilge, ballast and heeling pumps

(g) Fire pumps and other fire extinguishing medium pumps

(h) Ventilating fans for engine and boiler rooms

(i) Navigation lights, aids and signals

(j) Internal communication equipment required by 4-3-2/15

(k) Fire and gas detection and alarm system

(l) Lighting system

(m) Electrical equipment for watertight and fire-tight closing appliances

(n) Electric generators and associated power sources supplying secondary essential equipment

(o) Hydraulic pumps supplying secondary essential equipment

(p) Control, monitoring and safety devices/systems of equipment for secondary essential services

(q) Inerting systems

(r) (2005)Ambient temperature control equipment required by 4-3-1/17.3

(s) (2010)Watertight Doors (see 3-3-2/5)


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P A R T S e c t i o n 2 : M a c h i n e r y a n d E q u i p m e n t


S E C T I O N 2 Machinery and Equipment

1 Prime Movers (2012)

Prime movers (diesel engines, gas turbines, steam turbines) having a rated power of 100 kW (135 hp) and

over, intended for essential services (see 4-1-1/3.5) or for services related to additional optional notationsrequested for the drilling unit, are to be designed, constructed, tested, certified and installed in accordance

with the requirements of Part 4, Chapter 2 of the ABSRules for Building and Classing Steel Vessels (Steel

Vessel Rules).Prime movers having a rated power of less than 100 kW (135 hp) are not required to comply with theprovisions of Part 4, Chapter 2 of the Steel Vessel Rules, but are to be designed, constructed and equipped

in accordance with good commercial and marine practice. Acceptance of such engines will be based onmanufacturers affidavit, verification of engine nameplate data, and subject to a satisfactory performance

test after installation conducted in the presence of the Surveyor.

Prime movers having a rated power of 100 kW (135 hp) and over, intended for services not considered

essential (see 4-1-1/3.5) and not related to additional optional notations requested for the drilling unit, arenot required to be designed, constructed and certified by ABS in accordance with the requirements of Part 4,

Chapter 2 of the Steel Vessel Rules. However, they are to comply with safety features, such as crankcaseexplosion relief valve, overspeed protection, etc., as provided in 4-2-1/7 of the Steel Vessel Rules, as applicable.

After installation, they are subject to a satisfactory performance test conducted in the presence of the Surveyor.

3 Internal Combustion Engines Designed for Drilling Operations

(2012) In drilling units without CDS notation, internal combustion engines used solely for drillingoperations need not be of approved type and need not be inspected at the plant of manufacture. Suchequipment need only be provided with the safety provisions below and 4-2-6/9.

3.1 Crankcase Ventilation (1997)

3.1.1 General

Provision is to be made for ventilation of an enclosed crankcase by means of a small breather or

by means of a slight suction not exceeding 25.4 mm (1 in.) of water. Crankcases are not to be

ventilated by a blast of air. Otherwise, the general arrangements and installation are to be such asto preclude the possibility of free entry of air to the crankcase.

3.1.2 Piping Arrangement

Crankcase ventilation piping is not to be directly connected with any other piping system. Crankcaseventilation pipes from each engine are normally to be led independently to the weather and fitted

with corrosion-resistant flame screens. However, crankcase ventilation pipes from two or more

engines may lead to a common oil mist manifold.


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Part 4 Machinery and SystemsChapter 1 Machinery, Equipment and SystemsSection 2 Machinery and Equipment 4-1-2


5 Thrusters and Dynamic Positioning Systems (2012)

Compliance with the provisions of Section 4-3-5 of the Steel Vessel Rulesis required for main propulsionthrusters for self-propelled units in all cases and for propulsion assist thrusters andathwartship thrusterswhere an optional notation in accordance with 1-1-3/27 or 1-1-3/29 of the ABS Rules for Conditions of

Classification Offshore Units and Structures (Part 1)is requested. Dynamic positioning systems, includingtheir thrusters, are to comply with the ABS Guide for Dynamic Positioning Systems.

7 Moving Cantilevers, Skid Beams and Moveable Structures (2012)

A description of equipment for moving cantilevers, skid beams or moveable substructures, including piping and

electrical systems, details of mechanical components, including hold-down devices and applicable strength

calculations, is to be submitted for review.

9 Electrical Machinery and Equipment (2012)

For electrical machinery and equipment, refer to Section 4-3-4.

11 Certification of Machinery and Equipment (2012)

For certification of machinery and equipment required at vendors plant, refer to Part 6.


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12 ABS RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE DRILLING UNITS .2012

P A R T C h a p t e r 2 : P u m p s a n d P i p i n g S y s t e m s

4C H A P T E R 2 Pumps and Piping Systems

CONTENTS

SECTION 1 General .................................................................................................. 181 General Requirements ...................................................................... 18

1.1 Damage Stability..................................................................... ....... 181.3 Segregation of Piping Systems ...................................................... 18

3 Definitions ......................................................................................... 183.1 Piping ............................................................... .............................. 183.3 Piping System ............................................................. ................... 183.5 Piping Components ................................................................ ....... 183.7 Pipes ................................................................ .............................. 183.9 Pipe Schedule ............................................................ ................... 193.11 Tubes ............................................................... .............................. 193.13 Pipe Fittings ................................................................ ................... 193.15 Valves .............................................................. .............................. 193.17 Design Pressure of Components ................................................... 193.19 Maximum Working Pressure .......................................................... 193.21 Maximum Allowable Working Pressure ......................................... 193.23 Design Temperature ............................................................... ....... 193.25 Maximum Working Temperature ................................................... 203.27 Flammable Fluids ................................................................... ....... 203.29 Toxic Fluids ................................................................ ................... 203.31 Corrosive Fluids .......................................................... ................... 20

5 Classes of Piping Systems ............................................................... 207 Plans and Data to Be Submitted ....................................................... 22

7.1 Plans ................................................................ .............................. 227.3 All Piping Systems .................................................................. ....... 227.5 Booklet of Standard Details ........................................................... 22

9 Material Tests and Inspection ........................................................... 239.1 Specifications and Purchase Orders .............................................. 239.3 Special Materials .................................................................... ....... 23

11 General Installation Details ............................................................... 2311.1 Protection ................................................................... ................... 2311.3 Pipes Near Switchboards .............................................................. 2311.5 Expansion or Contraction Stresses................................................ 2311.7 Molded Expansion Joints ............................................................... 2311.9 Metallic Bellow Type Expansion Joints .......................................... 2411.11 Pipe Joints ..................................................................................... 2411.13

Mechanical Joints ..................... ..................................................... 24

11.15 Bulkhead, Deck or Tank-Top Penetrations .................................... 24


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15 Flanges ............................................................................................. 4415.1 General ............................................................ .............................. 4415.3 Class I and II Piping Flanges ......................................................... 4415.5 Class III Piping Flanges ................................................................. 44

17 Material of Valves and Fittings .......................................................... 44

17.1 General ............................................................ .............................. 4417.3 Forged or Cast Steel ............................................................... ....... 4417.5 Cast Iron ..................................................................... ................... 4417.7 Nonferrous .................................................................. ................... 4517.9 Ductile (Nodular) Iron .............................................................. ....... 45

19 Fluid Power Cylinders ....................................................................... 4519.1 General .......................................................................................... 4519.3 Non-compliance with a Recognized Standard ............................... 4519.5 Materials ..................................................................... ................... 4519.7 Rudder Actuators .................................................................... ....... 4619.9 Cylinders below Pressures or Temperatures Indicated

in 4-2-2/19.1 ............................................................... ................... 4619.11 Exemptions ................................................................. ................... 46

21 Sea Inlets and Overboard Discharges .............................................. 4621.1 Installation .................................................................. ................... 4621.3 Valve Connections to Shell ............................................................ 4621.5 Materials ..................................................................... ................... 4621.7 Shell Reinforcement ............................................................... ....... 4621.9 Sea-Water Inlet and Discharge Valves .......................................... 4721.11 Sea Chests ................................................................. ................... 47

23 Scuppers and Drains on Surface-Type and Self-Elevating Units ..... 4723.1 Discharges through the Shell ......................................................... 4723.3 Scuppers and Discharges below the Freeboard Deck Shell

Penetration .......................................... .......................................... 4823.5 Scuppers from Superstructures or Deckhouses ............................ 48

25 Cooler Installations External to the Hull ............................................ 4825.1 General ............................................................ .............................. 4825.3 Integral Keel Cooler Installations ................................................... 4825.5 Non-integral Keel Cooler Installations ............................................ 48

27 Penetrations through Watertight Boundaries .................................... 4827.1 Ventilating Systems ................................................................ ....... 4927.3 Internal Drain System ............................................................. ....... 49

TABLE 1 Allowable Stress Values Sfor Piping ...................................... 30TABLE 2 Fire Endurance Requirements Matrix ..................................... 40TABLE 3 Standards for Plastic Pipes Typical Requirements for All

Systems .................................................................................. 41TABLE 4 Standards for Plastic Pipes Additional Requirements

Depending on Service and/or Location of Piping ................... 42FIGURE 1 Fire Endurance Test Burner Assembly ................................... 38FIGURE 2 Fire Endurance Test Stand With Mounted Sample ................ 38


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SECTION 3 Tank Vents and Overflows .................................................................. 501 Tank Vents and Overflows ................................................................ 50

1.1 General................................................................................ .......... 501.3 Progressive Flooding Consideration .............................................. 501.5 Height and Wall Thickness of Vent Pipes ...................................... 50

1.7 Size .............................................................. ................................. 511.9 Termination of Vent Pipes ............................................................. 511.11 Overflow Pipes .................................................................... .......... 54

3 Sounding Arrangements ................................................................... 543.1 General................................................................................ .......... 543.3 Sounding Pipes ................................................................... .......... 543.5 Gauge Glasses .................................................................... .......... 553.7 Level Indicating Device ................................................................. 55

SECTION 4 Bilge and Ballast Systems and Tanks ................................................ 56

1 General Arrangement of Bilge Systems for Surface-Type Units ...... 561.1 General................................................................................ .......... 561.3 Number of Bilge Pumps................................................................. 561.5 Direct Bilge Suctions ........................................................... .......... 561.7 Emergency Bilge Suctions............................................................. 56

3 General Arrangement of Bilge Systems for Column-StabilizedUnits and Self-Elevating Units .......................................................... 573.1 Permanent Systems ............................................................ .......... 573.3 Void Compartments ............................................................. .......... 573.5 Chain Lockers ..................................................................... .......... 573.7 Bilge Alarm ............................................................... ..................... 57

5 Bilge Piping (All Units) ...................................................................... 575.1 General................................................................................ .......... 575.3 Installation ................................................................ ..................... 575.5 Manifolds, Cocks and Valves ........................................................ 585.7 Common-main-type Bilge Systems ............................................... 585.9 Strainers ................................................................... ..................... 585.11 Gravity Drains ........................................................... ..................... 585.13 Bilge Suctions from Hazardous Areas ........................................... 585.15 Exceptions ................................................................ ..................... 58

7 Bilge Pumps (All Units) ..................................................................... 587.1 General................................................................................ .......... 587.3 Arrangement and Capacity ............................................................ 59

9 Size of Bilge Suctions ....................................................................... 599.1 Surface-Type Units .............................................................. .......... 599.3 Column-Stabilized Units and Self-Elevating Units ......................... 60

11 Ballast Piping (All Units).................................................................... 6011.1 General................................................................................ .......... 6011.3 Installation ................................................................ ..................... 6011.5 Controls for Ballast Tank Valves ................................................... 6011.7 Exceptions ................................................................ ..................... 6011.9 Ballast Water Treatment Systems ................................................. 61


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3 Hydraulic Systems ............................................................................ 723.1 General................................................................................ .......... 723.3 Valves............................................................................................ 723.5 Piping ........................................................... ................................. 723.7 Pipe Fittings .............................................................. ..................... 733.9 FlexibleHoses............................................................................... 733.11 Accumulators ............................................................ ..................... 733.13 Fluid Power Cylinders ................................................................... 733.15 Design Pressure .................................................................. .......... 733.17 Segregation of High Pressure Hydraulic Units .............................. 73

5 Fixed Oxygen-Acetylene Installations ............................................... 735.1 Application ................................................................ ..................... 735.3 Gas Storage ............................................................. ..................... 745.5 Piping System Components .......................................................... 74

7 Fuel Storage for Helicopter Facilities ................................................ 757.1 General................................................................................ .......... 757.3 Spill Containment ................................................................ .......... 76

9 Starting-air Systems .......................................................................... 769.1 Design and Construction ............................................................... 769.3 Starting-air Capacity ............................................................ .......... 769.5 Protective Devices for Starting-air Mains....................................... 77

11 Cooling-water Systems for Internal Combustion Engines ................ 7711.1 General................................................................................ .......... 7711.3 Sea Suctions ............................................................ ..................... 7711.5 Strainers ................................................................... ..................... 7811.7 Circulating Water Pumps ............................................................... 78

13 Exhaust System ................................................................................ 7813.1 Exhaust Lines ........................................................... ..................... 7813.3 Exhaust Gas Temperature ............................................................ 78

15 Valves in Atomizing Lines ................................................................. 7817 Helicopter Deck Drainage Arrangements ......................................... 7819 Boilers and Associated Piping .......................................................... 7821 Steering Gear Piping ......................................................................... 7823 Gas Turbine Piping ........................................................................... 7825 Raw Water System for Self-Elevating Units in Elevated

Condition ........................................................................................... 7925.1 General................................................................................ .......... 7925.3 Raw Water Tower ................................................................ .......... 7925.5 Leg Well Suction .......................................... ................................. 7925.7 Hose Reel ................................................................. ..................... 79


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P A R T S e c t i o n 1 : G e n e r a l

4C H A P T E R 2 Pumps and Piping Systems

S E C T I O N 1 General

1 General Requirements

Piping systems are to be in accordance with the applicable requirements of this Section. Piping systems

used solely for drilling operations and complying with a recognized standard need not be in accordancewith these Rules. All piping systems are to be installed and tested in accordance with the Rules or recognizedstandards to the satisfaction of the attending Surveyor.

1.1 Damage Stability

When considering the design and layout of piping systems, consideration is to be given to the damage

stability requirements and the assumed extent of damage for the type of unit under consideration, as outlinedin 3-3-2/3.5.

1.3 Segregation of Piping Systems

Piping systems carrying non-hazardous fluids are to be segregated from piping systems which may containhazardous fluids. Cross connection of the piping systems may be made where means for avoiding possible

contamination of the non-hazardous fluid system by the hazardous medium are provided.

3 Definitions (2012)

3.1 Piping

The termPipingrefers to assemblies of piping components and pipe supports.

3.3 Piping System

Piping System is a network of piping and any associated pumps, designed and assembled to serve a

specific purpose. Piping systems interface with, but exclude, major equipment, such as boilers, pressurevessels, tanks, diesel engines, turbines, etc.

3.5 Piping Components

Piping Componentsinclude pipes, tubes, valves, fittings, flanges, gaskets, bolting, hoses, expansion joints,

sight flow glasses, filters, strainers, accumulators, instruments connected to pipes, etc.

3.7 Pipes

Pipes are pressure-tight cylinders used to contain and convey fluids. Where the word pipe is used in this

section, it means pipes conforming to materials and dimensions as indicated in Sections 2-3-12, 2-3-13,

2-3-16, and 2-3-17 of the ABSRules for Materials and Welding (Part 2), or equivalent national standardssuch as ASTM, BS, DIN, JIS, etc.


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Part 4 Machinery and SystemsChapter 2 Pumps and Piping SystemsSection 1 General 4-2-1


3.9 Pipe Schedule

Pipe Schedulesare designations of pipe wall thicknesses as given in American National Standard Institute,ANSI B36.10. Standard and extra heavy (extra strong) pipes, where used in these sections, refer to

Schedule 40 and Schedule 80, up to maximum wall thicknesses of 9.5 mm (0.375 in.) and 12.5 mm (0.5 in.),

respectively.

3.11 Tubes

Tubes are generally small-diameter thin-wall pipes conforming to an appropriate national standard. Tubes

are to meet the same general requirements as pipes.

3.13 Pipe Fittings

Pipe Fittingsrefer to piping components such as sleeves, elbows, tees, bends, flanges, etc., which are used

to join together sections of pipe.

3.15 Valves

The term Valverefers to gate valves, globe valves, butterfly valves, etc., which are used to control the flow

of fluids in a piping system. For the purpose of these Rules, test cocks, drain cocks and other similarcomponents which perform the same function as valves are considered valves.

3.17 Design Pressure of Components

Design Pressure is the pressure to which each piping component of a piping system is designed withregard to the mechanical characteristics of the component. The design pressure of a piping component isnot to be less than the maximum working pressure in the section of the piping system where is located, as

defined in 4-2-1/3.19. However, the Rules may impose in some instances a specific minimum designpressure that exceeds the maximum expected service pressure. The design pressure will define the pressure

rating of the component.

3.19 Maximum Working Pressure

The Maximum Working Pressure is the pressure of a piping system at the most severe condition ofcoincidental internal or external pressure and temperature (maximum or minimum) expected during service,including transient conditions. The maximum working pressure may be also known by the industry as design

pressure of the piping system. For the purpose of the Rules, the maximum working pressure may be taken asthe setting of the pressure relief valve protecting the piping system or the section of the system.

3.21 Maximum Allowable Working Pressure

TheMaximum Allowable Working Pressure (MAWP)is the maximum pressure of a piping system determined,

in general, by the piping component with the lowest design pressure in the system. The maximum allowableworking pressure is not to be less than the maximum working pressure, as defined in 4-2-1/3.19, and not to

exceed the design pressure of any piping component in the system or section of the system, as defined in4-2-1/3.17. Where pressure relief valves are fitted, the settings are not to exceed the maximum allowable

working pressure of the piping system or the section of the system in which the relief valve is located.

3.23 Design Temperature

The Design Temperature is the maximum temperature at which each piping component is designed to

operate. It is not to be less than the temperature of the piping component material at the most severecondition of temperature and coincidental pressure expected during service. For purposes of the Rules, it

may be taken as the maximum fluid temperature for which the piping component is designed.

For piping used in a low-temperature application, the design temperature is to include also the minimumtemperature at which each piping component is designed to operate. It is not to be higher than the temperatureof the piping component material at the most severe condition of temperature and coincidental pressure

expected during service. For the purposes of the Rules, it may be taken as the minimum fluid temperature.

For all piping components, the design temperature is to be used to determine allowable stresses andmaterial testing requirements.


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3.25 Maximum Working Temperature

The Maximum Working Temperature is the maximum fluid temperature of a piping system at the most

severe condition of temperature and coincidental pressure expected during service, including transientconditions. The maximum working temperature of a piping system or a section of the system is not to

exceed the design temperature of any piping component in the system or section of the system.

3.27 Flammable Fluids

Any fluid, regardless of its flash point, liable to support a flame is to be treated as a flammable fluid for thepurposes of Section 4-2-1 through Section 4-2-6. Aviation fuel, diesel fuel, heavy fuel oil, lubricating oiland hydraulic oil (unless the hydraulic oil is specifically specified as non-flammable) are all to be

considered flammable fluids.

3.29 Toxic Fluids

Toxic Fluidsare those that are liable to cause death or severe injury or to harm human health if swallowedor inhaled or by skin contact.

3.31 Corrosive Fluids

Corrosive Fluids, excluding seawater, are those possessing in their original state the property of being able

through chemical action to cause damage by coming into contact with living tissues, the vessel or itscargoes, when escaped from their containment.

5 Classes of Piping Systems (2012)

Piping systems are divided into three classes according to service, maximum working pressure and

maximum working temperature, as indicated in 4-2-1/Table 1. Each class has specific requirements for

joint design, fabrication and testing. The requirements in this regard are given in 4-2-2/5 for metallicpiping. For plastic piping, see 4-2-2/7.


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TABLE 1Classes of Piping Systems (2013)

Class I

Class II

Class III

T1

T2

Temperature

P1

P2

Pressure

Piping Class Class I

P >P2 OR T >T2

Class II Bounded by Class Iand Class III - see chart above

Class III

P P1 AND T T1

Piping System bar, C(kgf/cm2, psi) (F)

bar, C

(kgf/cm2, psi) (F)

bar, C

(kgf/cm2, psi) (F)

Corrosive fluids Without special safeguards With special safeguard Not applicable

Toxic fluids All Not applicable Not applicable

Flammable liquids heated toabove flash point or having

flash point 60C or less

Without special safeguards With special safeguards Open-ended piping

Liquefied gas Without special safeguards With special safeguards Open-ended piping

Steam16

(16.3, 232)

300

(572)See chart

7

(7.1, 101.5)

170

(338)

Thermal oil16

(16.3, 232)

300

(572)See chart

7

(7.1, 101.5)

150

(302)

Fuel oil

Lubricating oil

Flammable hydraulic oil

16

(16.3, 232)

150

(302)See chart

7

(7.1, 101.5)

60

(140)

Cargo oil piping in cargo area Not applicable Not applicable All

Other fluids (including water,

air, gases, non-flammablehydraulic oil)

40

(40.8, 580)

300

(572)See chart

16

(16.3, 232)

200

(392)

Open ended pipes (drains,

overflows, vents, exhaust gaslines, boilers escapes pipes)

Not applicable Not applicable All

(2013)Fixed Oxygen-acetylene System

High pressure Side Not applicable Low pressure Side

Notes:1 The above requirements are not applicable to piping systems intended for liquefied gases in cargo and process areas.

2 The above requirements are also not applicable to cargo piping systems of vessels carrying chemicals in bulk.

3 Safeguards are measures undertaken to reduce leakage possibility and limiting its consequences, (e.g., double wall

piping or equivalent, or protective location of piping etc.)


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9 Material Tests and Inspection

9.1 Specifications and Purchase Orders

The appropriate material to be used for the various pipes, valves and fittings is indicated in 4-2-2/5 to

4-2-2/19. The material is to be made in accordance with the requirements in Chapter 3 of the ABS Rulesfor Materials and Welding (Part 2), except that tests of material for valves and fittings and fluid power

cylinders need not be witnessed by the Surveyor. Where electric welding is used, the requirements inChapter 4 of the above-referenced Part 2 are also applicable.

9.3 Special Materials

If it is desired to use special alloys or other materials not covered by the Rules, the use of such materialswill be specially considered for approval.

11 General Installation Details

11.1 Protection (2012)

Reference is made to 7-1-3/11.3.

11.3 Pipes Near Switchboards (2012)

Reference is made to 7-1-3/11.5.

11.5 Expansion or Contraction Stresses (2012)

Ample provision is to be made to take care of expansion or contraction stresses in pipes due to temperaturechanges or working of the hull. Suitable provisions include, but are not limited to, piping bends, elbows,

offsets, changes in direction of the pipe routing or expansion joints. Slip joints of an approved type may beused in systems and locations where possible leakage will not be critical. See also 4-2-4/5.3 and 4-2-4/11.3.

11.7 Molded Expansion Joints (2004)Molded expansion joints may be Type Approved; see 1-1-A2/1 of the ABS Rules for Conditions of

Classification Offshore Units and Structures (Part 1).

11.7.1 Circulating Water Systems (2012)

Molded expansion fittings of reinforced rubber or other suitable materials may be used in Class IIIsea water piping systems in machinery spaces. Such fittings are to be oil-resistant. The maximum

working pressure is not to be greater than 25% of the hydrostatic bursting pressure of the fitting asdetermined by a prototype test. Manufacturers name and the month and year of manufacture are

to be embossed or otherwise permanently marked on the outside edge of one of the flanges orother easily examined area of all flexible expansion joints intended for use in seawater piping

systems over 150 mm (6 in.). Plans of the molded or built-up flexible expansion joints in seawater

piping systems over 150 mm (6 in.), including details of the internal reinforcement arrangements,are to be submitted for approval.

11.7.2 Oil Systems

Where molded expansion joints of composite construction utilizing metallic material, such as steelor stainless steel or equivalent material, with rubberized coatings inside and/or outside or similar

arrangements are proposed for use in oil piping systems (fuel, lubricating, or hydraulic oil), the

following requirements apply:

11.7.2(a) Expansion joint ratings for temperature, pressure, movements and selection of materials

are to be suitable for the intended service.

11.7.2(b) (2012) The maximum working pressure of the system is not to be greater than 25% ofthe hydrostatic bursting pressure determined by a burst test of a prototype expansion joint.

Results of the burst test are to be submitted.


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11.7.2(c) (2012) The expansion joints are to pass the fire resistant test specified in 4-2-1/11.7.3,below.

11.7.2(d) The expansion joints are to be permanently marked with the manufacturers name and

the month and year of manufacture.

11.7.3 Fire Resistant Test (2012)In order for a molded expansion joint of composite construction utilizing metallic material, asreferenced in 4-2-1/11.7.2, to be considered fire-resistant, a prototype of the molded expansion

joint is to be subjected to a fire test for at least 30 minutes at a temperature of not less than 800C(1472F) while water at or above the maximum working pressure is circulated inside. Thetemperature of the water at the outlets is not to be less than 80C (176F) during the test. The testedmolded expansion joint is to be complete with end fittings, and no leakage is to be recorded duringor after the test. In lieu of maximum workingpressure, the fire test may be conducted with thecirculating water at a pressure of at least 5 bar (5.1 kgf/cm2, 72.5 lb/in2), and with a subsequentpressure test to twice the design pressure. This test may be performed in accordance with ISO15540 and ISO 15541.

11.9 Metallic Bellow Type Expansion Joints (2012)Metallic bellow type expansion joints may be used in all classes of piping, except that where used in

Classes I and II piping, they will be considered based upon satisfactory review of the design. Detailedplans of the joint are to be submitted along with calculations and/or test results verifying the pressure and

temperature rating and fatigue life.

11.11 Pipe Joints (2012)

Butt welded joints, socket welded joints, slip-on welded sleeve joints, flanged joints and threaded joints are to

comply with the requirements of 4-6-2/5.5 of the Steel Vessel Rules. See also 4-2-2/11.

11.13 Mechanical Joints (2012)

Pipe unions (welded and brazed types), compression couplings (swage, press, bite, and flare types) and slip-onjoints (grip, machine grooved and slip types) are to comply with the requirements of 4-6-2/5.9 of the Steel

Vessel Rules. See also 4-2-2/11.

11.15 Bulkhead, Deck or Tank-Top Penetrations (2013)

11.15.1 Watertight Integrity

Where it is necessary for pipes to penetrate watertight bulkheads, decks or tank tops, the

penetrations are to be made by methods which will maintain the watertight integrity. For thispurpose, bolted connections are to have bolts threaded into the plating from one side; throughbolts are not to be used. Welded connections are either to be welded on both sides or to have full

penetration welds from one side.

11.15.2 Firetight Integrity

Where pipes penetrate bulkheads, decks or

MODU Part 4 E-July13

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Transcript of MODU Part 4 E-July13