§ 30 Fire divisions
Main areas and fire areas on facilities shall be separated by fire divisions that can withstand the design loads for fire and explosion. If the fire divisions may be exposed to hydrocarbon fires, they shall, as a minimum, satisfy fire rating H-0 and withstand the worst credible process fire.
Rooms with important functions and important equipment, as well as rooms with a high risk of fire, shall be separated from their surroundings with fire divisions with a fire rating corresponding to the fire type and the established fire and explosion loads to which they would be exposed.
Penetrations shall not weaken the fire divisions. Doors in fire divisions shall be self-closing.
Section last changed: 01 January 2023
For fire divisions in living quarters, see Section 31.
For determination of fire and explosion loads as mentioned in the first and second subsections, see Section 11. Worst credible process fire as mentioned in the first paragraph means a fire in a fire area from the segment that produces the worst fire load on load-bearing structures and fire divisions with regard to duration and fire load. To define the worst credible process fire, NORSOK S-001 Chapter 126.96.36.199 should be used.
The main fire divisions in closed areas should be able to withstand an explosion load of at least 70 kPa for 0.2 seconds. Fire divisions with coated or sprayed-on fire protection material that does not fulfil the requirements for inflammability, may be used if an overall assessment indicates that this is prudent from a safety point of view, cf. Section 12.
Fire divisions as mentioned in the second subsection, should satisfy fire class
- A-60 for control and emergency preparedness rooms, rooms for fire pump systems and rooms for emergency power source with associated distribution equipment and fuel tanks if these rooms are located in an area that cannot be exposed to hydrocarbon loads. Fire class A-60 is the recommended solution for these rooms since the second subsection requires protection of technical barrier elements in the room. This means that the rooms should be protected against fire on the outside of the room,
- A-0 for rooms for electrical equipment, fan rooms, rooms where flammable or easily ignited goods are stored and rooms for fire pumps that are located in pontoons and columns.
Special fire conditions may entail a need for fire divisions with higher fire resistance.
Examples of penetrations in fire divisions as mentioned in the last subsection, may include ventilation ducts, pipes, cables and beams, as well as windows and doors. The test methods in the following standards should be used for penetrations:
- ISO 3008 for doors,
- ISO 3009 for windows,
- IMO 2010 FTP Code Part 3 for other types of penetrations such as ducts, pipes and cable penetrations.
For structures that may be exposed to hydrocarbon fires, reference is made to standards in the guidelines to Section 29.
Penetrations in main fire divisions and fire divisions with fire class H should be avoided to the extent possible.
For mobile facilities that are not production facilities and that are registered in a national ship register, DNVGL-OS-D301 Chapter 2, Paragraph 1 can be used as an alternative.