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Ch.1: General [Table of Contents] Ch.2: Technical Provisions

DNV-OS-D301 Fire Protection

[-] Ch.1: General
[-] Sec.1: Introduction

Ch.1

SECTION 1
Introduction

Ch.1 Sec.1
A. General

Ch.1 Sec.1
A 100   Introduction

Ch.1 Sec.1 A
101   This offshore standard provides principles for design, construction and installation of fire protection of offshore units and installations.

Ch.1 Sec.1 A
102   This standard is applicable to drilling, storage, production, accommodation and other types of offshore units and installations.

Ch.1 Sec.1 A
103   The standard has been written for general worldwide application. Governmental legislation may include requirements in excess of the provisions in this standard depending on type, location and intended service of the unit or installation.

Ch.1 Sec.1
A 200   Objectives

Ch.1 Sec.1 A
201   The objectives of this standard are to:
—provide an internationally acceptable standard of safety for fire protection by defining minimum requirements for the design, construction and commissioning of such systems
—serve as a reference document in contractual matters between purchaser and contractor
—serve as a guideline for designers, purchasers and contractors
—specify procedures and requirements for fire protection systems subject to DNV certification and classification.

Ch.1 Sec.1
A 300   Organisation of the standard

Ch.1 Sec.1 A
301   This standard is divided into three main parts:
—Ch.1: General introduction, scope, definitions and references.
—Ch.2: Technical provisions for fire protection systems including Appendix A: Requirements for fixed fire fighting systems.
—Ch.3: Certification and Classification

Ch.1 Sec.1
A 400   Adopted international maritime standards

Ch.1 Sec.1 A
401   The requirements of this standard are considered to meet the regulations of the International Maritime Organisation Code for Construction and Equipment of Mobile Offshore Drilling Units, (MODU Code) Consolidated Edition 2001 with regard to fire protection, detection and fire fighting systems and equipment.

Ch.1 Sec.1 A
402   Requirements quoted from the MODU Code and SOLAS are printed in Arial italics with the appropriate reference.

SOLAS references are as quoted in MODU Code 1989 and fulfil class requirements. Note that for compliance with flag state requirements, later amendments may be applicable.

Ch.1 Sec.1 A
403   For the application of this standard, wherever the term Administration is quoted, this means:
—client or purchaser or other designated party, when used as a "neutral" technical standard, or
—DNV, when used for certification or classification purposes.


Ch.1 Sec.1 A
404   When used in text quoted from the MODU Code, the term shall be taken as a requirement to be followed in order to conform to this standard.

Ch.1 Sec.1
B. Normative References

Ch.1 Sec.1
B 100   General

Ch.1 Sec.1 B
101   The standards in 200 and 300 include provisions, which, through reference in the text, constitute provisions of this offshore standard. Latest issue of the references shall be used unless otherwise agreed. Other recognised standards may be used provided it can be demonstrated that these meet or exceed the requirements of the standards referenced in 200 to 300.

Ch.1 Sec.1 B
102   Any deviations, exceptions and modifications to the design codes and standards shall be documented and agreed between the contractor, purchaser and verifier, as applicable.

Ch.1 Sec.1
B 200   Offshore Standards

Ch.1 Sec.1 B
201   The latest revision of the DNV Offshore Standards listed in Table B1 applies.

Ch.1 Sec.1 B
Table B1 DNV Offshore Standards 
Reference Title 
DNV-OS-A101 Safety Principles and Arrangement 
DNV-OS-D101 Marine and Machinery Systems and Equipment  
DNV-OS-D202 Instrumentation and Telecommunication Systems 

Ch.1 Sec.1
B 300   Other references

Ch.1 Sec.1 B
301   The latest revision of the documents listed in Table B2 applies.

Ch.1 Sec.1 B
Table B2 DNV Normative references 
Reference Title 
EN 54-5 Components of Automatic Fire Detection
Systems Part 5 Heat Sensitive Detectors - Point Detectors Containing a Static Element 
EN 54-7 Components of Automatic Fire Detection
Systems - Part 7: Point-Type Smoke Detectors; Detectors Using Scattered Light, Transmitted Light or Ionization 
FTP Code International Code for Application of Fire Test Procedures 
NFPA Codes National Fire Protection Association 
IMO FSS Code International Code for Fire Safety Systems 
ISO 13702 Petroleum and natural gas industries - Control and mitigation of fires and explosions on offshore
production installations - Requirements and guidelines 
MODU Code Code for the Construction and Equipment of
Mobile Offshore Drilling Units, Consolidated Edition 2001 
SOLAS  International Convention for the Safety of Life at Sea, 1974, as amended
(Including the 1996 Amendments of Ch. II-2,
effective 1 July 1998) 

Ch.1 Sec.1
C. Definitions

Ch.1 Sec.1
C 100   Verbal forms

Ch.1 Sec.1 C
101   Shall: Indicates requirements strictly to be followed in order to conform to this standard and from which no deviation is permitted.

Ch.1 Sec.1 C
102   Should: Indicates that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others, or that a certain course of action is preferred but not necessarily required. Other possibilities may be applied subject to agreement.

Ch.1 Sec.1 C
103   May: Verbal form used to indicate a course of action permissible within the limits of the standard.

Ch.1 Sec.1 C
104   Agreement or by agreement: Unless otherwise indicated, means agreed in writing between manufacturer or yard and purchaser.

Ch.1 Sec.1
C 200   Definitions

Ch.1 Sec.1 C
201   'H" class divisions

Divisions formed by bulkheads and decks which comply with the following:

  1. they shall be constructed of steel or other equivalent material
  2. they shall be suitably stiffened
  3. they shall be constructed as to be capable of preventing the passage of gas, smoke and flames up to the end of the two-hour standard fire test
  4. they shall be insulated with approved non-combustible materials or equivalent passive fire protection such that the average and maximum temperature of the unexposed side will not rise to more than 140 °C and 180 °C respectively above the original temperature, within the time listed below:
    —class H-120 120 minutes
    —class H-60 60 minutes
    —class H-0 0 minutes

    (Additionally, a class H-0400 is often used, where 400 means the temperature limitation on the unexposed side. The class H-240 is also used for some equipment).

A test of a prototype division is required to ensure that it meets the requirements for integrity and temperature rise.

Ch.1 Sec.1 C
202   "A" class divisions

Divisions formed by bulkheads and decks which comply with the following:
1.they shall be constructed of steel or other equivalent material;
2.they shall be suitably stiffened;
3.they shall be so constructed as to be capable of preventing the passage of smoke and flame to the end of the one-hour standard fire test;
4.they shall be insulated with approved non-combustible materials such that the average temperature of the unexposed side will not rise more than 140 C above the original temperature, nor will the temperature, at any one point, including any joint, rise more than 180 C above the original temperature, within the time listed below:
—class 'A-60' 60 minutes
—class 'A-30' 30 minutes
—class 'A-15' 15 minutes
—class 'A-0" 0 minutes.
5.The Administration shall require a test of prototype bulkhead or deck in accordance with the Fire Test Procedures Code to ensure that it meets the above requirements for integrity and temperature rise.

(SOLAS reg. II-2/3.3)

Ch.1 Sec.1 C
203   "B" class divisions

Divisions formed by bulkheads, decks, ceilings or linings which comply with the following:
1.they shall be so constructed to be capable of preventing the passage of flame to the end of the first half hour of the standard fire test;
2.they shall have an insulation value such that the average temperature of the unexposed side will not rise more than 140 °C above the original temperature, nor will the temperature at any one point, including any joint, rise more than 225 °C above the original temperature, within the time listed below:
—class 'B-15' 15 minutes
—class 'B-0" 0 minutes.
3.they shall be constructed of recognised non-combustible materials and all materials entering into the construction and erection of 'B' class divisions shall be non-combustible, with the exception that combustible veneers may be permitted provided they meet other requirements of this Chapter.
4.The Administration shall require a test of prototype bulkhead or deck in accordance with the Fire Test Procedures Code to ensure that it meets the above requirements for integrity and temperature rise.

(SOLAS reg. II-2/3.4)

Ch.1 Sec.1 C
204   "C" class divisions

Divisions constructed of approved non-combustible materials. They need meet neither requirements relative to the passage of smoke and flame nor limitations relative to the temperature rise. Combustible veneers are permitted provided they meet other requirements of this Chapter.

(SOLAS reg. II-2/3.5)

Ch.1 Sec.1 C
205   Accommodation spaces

Accommodation spaces are those used for public spaces, corridors, lavatories, cabins, offices, hospitals, cinemas, games and hobby rooms, pantries containing no cooking appliances and similar spaces. Public spaces are those portions of the accommodation which are used for halls, dining rooms, lounges and similar permanently enclosed spaces.

(MODU Code 1.3.45)

The accommodation area is normally used as the safe haven or temporary refuge.

Ch.1 Sec.1 C
206   Control stations

Control stations are those spaces in which the unit's radio or main navigation equipment or the emergency source of power is located or where the fire recording or fire control equipment or dynamical positioning control system is centralised or where the fire- extinguishing system serving various locations is situated. In case of column stabilised units a centralised ballast control station is a 'control station'. However, for purposes of the application of Ch.2 Sec.1, the space where the emergency source of power is located is not considered as being a control station.

(MODU Code 1.3.31)

Typical examples are central control room, radio room, process control room, local control rooms, local equipment rooms, bridge, emergency response room etc.

Ch.1 Sec.1 C
207   Corridor

Includes corridors and lobbies.

Ch.1 Sec.1 C
208   Deluge system

A system to apply firewater through an array of open spray nozzles by operation of a valve on the inlet to the system. The system will discharge through all nozzles served by the deluge valve.

Ch.1 Sec.1 C
209   Draught stop

A close fitting hindering any smoke from passing.

Ch.1 Sec.1 C
210   Drilling areas

Includes the derrick, drill floor, BOP area and the area containing shale shakers and degassers. See utility area for drilling utilities such as mud mixing, pumping, bulk storage and cementing.

Ch.1 Sec.1 C
211   Embarkation area

The area where personnel collect and enter each lifeboat or liferaft.

Ch.1 Sec.1 C
212   Enclosed spaces

Any space bounded by floors, bulkhead and/or decks which may have doors, windows or other similar openings.

Ch.1 Sec.1 C
213   Fire and gas detection system

A fire and gas system is a combined fire detection system and gas detection system.

Ch.1 Sec.1 C
214   Fire area

An area divided from other areas by horizontal and vertical fire divisions, of at least A-0 rating.

Ch.1 Sec.1 C
215   Fire detection system

The system includes:

  1. fire detectors and manual call points (MACs)
  2. a fire central receiving and evaluating signals from the fire detectors and MACs, and creating output signals to the alarm system and the shutdown system. The fire central shall include a device providing visual indication of activated detectors and a local audible alarm
  3. signal transfer lines between detectors, MACs and fire central
  4. power supply.


Ch.1 Sec.1 C
216   Fire load

The total released heat quantity in case of a complete combustion of all combustible materials in an area, including materials in walls, decks and ceilings.

Ch.1 Sec.1 C
217   Fire pump system

The total system including power source, pump unit transmission, fuel and cooling systems.

Ch.1 Sec.1 C
218   Flame retardant

Property of a substance or treatment applied to a material to substantially suppress, reduce or delay the propagation of a flame.

Ch.1 Sec.1 C
219   Gas detection system

The system includes:

  1. gas detectors and manual call points (MACs)
  2. a gas central receiving and evaluating signals from the gas detectors and MACs, and creating output signals to the alarm system and the shutdown system. The gas central shall include a device providing visual indication of activated detectors and a local audible alarm
  3. signal transfer lines between detectors, MACs and gas central
  4. power supply.


Ch.1 Sec.1 C
220   Hazardous areas

All areas in which a flammable or explosive gas and air mixtures is, or may normally be expected to be, present in quantities such as to require special precautions for the construction and use of electrical equipment and machinery.

Ch.1 Sec.1 C
221   Jet fire

An ignited release of pressurised and flammable fluid.

Ch.1 Sec.1 C
222   Low flame spread

Means that the surface thus described will adequately restrict the spread of flame, this being determined in accordance with the Fire Test Procedures Code (FTPC).

(SOLAS reg. II-2/3.8)

Ch.1 Sec.1 C
223   Machinery spaces

Machinery spaces are all machinery spaces of category A and all other spaces containing propelling machinery and other fired processes, oil fuel units, steam and internal combustion engines, generators and major electrical machinery, oil filling stations, refrigerating, stabilising, ventilation and air conditioning machinery, and similar spaces, and trunks to such spaces.

(MODU Code 1.3.30)

Ch.1 Sec.1 C
224   Machinery spaces of category A

Machinery spaces of category A are all spaces which contain internal combustion machinery used for either:
1.main propulsion; or
2.for other purposes where such machinery has in the aggregate a total power output of not less than 375 kW; or which contain any oil-fired boiler or oil fuel unit; and trunks to such spaces.

(MODU Code 1.3.29)

Ch.1 Sec.1 C
225   Non-combustible material

Is material that neither burns nor gives off flammable vapours in sufficient quantity for self-ignition when heated to approximately 750°C, this being determined in accordance with the Fire Test Procedures Code (FTP Code). Any other material is a combustible material.

(SOLAS reg. II-2/3.1)

Ch.1 Sec.1 C
226   Oil fuel unit

The equipment used for the preparation of oil fuel for delivery to an oil-fired boiler, or equipment used for the preparation for delivery of heated oil to an internal combustion engine, and includes any oil pressure pumps, filters and heaters dealing with oil at a pressure of more than 0.18 N/mm.

(SOLAS reg. II-2/3.21).

Spaces which contain oil-fired equipment other than boilers, such as inert gas generators, incinerators, etc. should be considered as machinery spaces of category "A" in accordance with this regulation.

(IMO MSC/Circ.847 Annex)

Ch.1 Sec.1 C
227   Open decks

Open deck spaces, excluding hazardous areas.

Ch.1 Sec.1 C
228   Passive fire protection

A coating, cladding, or free standing system that provides thermal protection in the event of a fire and that requires no manual, mechanical or other means of initiation, replenishment or sustenance.

Ch.1 Sec.1 C
229   Pool fire

Combustion of flammable or combustible liquid spilled and retained at a surface.

Ch.1 Sec.1 C
230   Primary deck covering

A deck covering which will not readily ignite or give rise to toxic or explosive hazards at elevated temperatures. Testing shall be based on IMO res. A.687(17) or an equivalent test procedure.

Ch.1 Sec.1 C
231   Processing area

Any area designated for separation, compression, treatment and disposal of reservoir fluids.

Ch.1 Sec.1 C
232   Production area

The area accommodating the entire production process from the wellhead, incoming flowlines or pipelines to the most downstream discharge valve, as relevant to the unit in question. This includes the riser or turret area.

Ch.1 Sec.1 C
233   Public spaces

Those portions of the accommodation which are used for halls, dining rooms, lounges and similar permanently enclosed spaces.

(SOLAS reg. II-2/3.11)

Ch.1 Sec.1 C
234   Sanitary and similar spaces

Communal sanitary facilities such as showers, baths, lavatories, etc., and isolated pantries containing no cooking appliances. Sanitary facilities which serve a space and with access only from that space shall be considered a portion of the space in which they are located.

(MODU Code 9.1.4.2.11)

Ch.1 Sec.1 C
235   Service spaces

Service spaces are those spaces used for galleys, pantries containing cooking appliances, lockers and store rooms, workshops other than those forming part of the machinery spaces, and trunks to such spaces.

(MODU Code 1.3.46)

Ch.1 Sec.1 C
236   Service spaces (high risk)

Lockers, store-rooms and working spaces in which flammable materials are stored, galleys, pantries containing cooking appliances, paint rooms and workshops other than those forming part of the machinery space.

(MODU Code 9.1.4.2.9)

Ch.1 Sec.1 C
237   Service spaces (low risk)

Lockers, storerooms and working spaces in which flammable materials are not stored, drying rooms and laundries.

(MODU Code 9.1.4.2.5)

Ch.1 Sec.1 C
238   Sprinkler system

A system to apply firewater through nozzles by heat exposure of frangible bulb. The system is charged with pressurised firewater up to the nozzle (may also be pressurised air). Only fire exposed nozzles will discharge firewater. The system normally also include a control valve and a device for actuating alarm when system operates.

Ch.1 Sec.1 C
239   Stairways

Interior stairways, lifts and escalators (other than those wholly contained within the machinery spaces) and enclosures thereto. In this connection a stairway which is enclosed only at one level shall be regarded as part of the space from which it is not separated by a fire door.

(MODU Code 9.1.4.2.4)

Ch.1 Sec.1 C
240   Turret

A turnable support for riser and mooring lines to enable heading control of the vessel without twisting mooring lines and flexible risers.

Ch.1 Sec.1 C
241   Wellhead area

The deck area surrounding the wellheads including test, production, and injection manifolds and associated flowlines.

Ch.1 Sec.1 C
242   Working spaces

Open or enclosed spaces containing equipment and processes, associated with drilling operations, which are not included in machinery spaces or hazardous areas.

Ch.1 Sec.1
C 300   Abbreviations

Ch.1 Sec.1 C
301   The abbreviations in Table C1 are used.

Ch.1 Sec.1 C
Table C1 Abbreviations 
Abbreviation In full 
BOP Blow out preventer 
DNV Det Norske Veritas 
ESD Emergency shutdown 
FTP Fire Test Procedures (Code) 
HVAC Heating, ventilation and air conditioning 
IEC International Electrotechnical Commission 
IMO International Maritime Organization 
ISO International Organisation of Standardisation 
LEL Lower explosion limit 
MAC Manually activated call point 
MODU Mobile Offshore Drilling Unit 
NFPA National Fire Protection Association 
OS Offshore standard 
OSS Offshore service specification 
PFP Passive fire protection 
RP Recommended practice 
STL Submerged turret loading 
STP Submerged turret production 
UPS Uninterruptible power supply 

Ch.1 Sec.1
D. Documentation

Ch.1 Sec.1
D 100   General

Ch.1 Sec.1 D
101   Design documentation covering the following aspects is normally produced to document fire technical systems provided under this standard:
—fire pumps
—fire protection philosophy
—fire protection specification
—fire main
—hydrants and hoses
—fixed fire extinguishing arrangement in engine and boiler room
—fire control plan
—automatic sprinkler system
—fixed fire detection and alarm systems in accommodation spaces, machinery spaces, and product storage spaces
—specification and location of detectors, equipment alarms and call points
—wiring diagrams
—ventilation system layout including dimensions and penetrations of ducts through fire divisions
—details of fire dampers
—penetrations of cables and pipes through fire divisions
—arrangement of means of control for closure of openings, stop of ventilation fans and stop of fuel oil pumps in machinery spaces
—fire integrity of bulkheads and decks
—general arrangement of all rooms showing fire insulation and draught stops
—details of insulation and specification of materials
—fire doors in different types of bulkheads and specification of doors
—deck coverings and surface materials specification and positions.
Ch.1: General [Table of Contents] Ch.2: Technical Provisions