(IV-7-3) General Safety

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Rules IV Industrial Services Part 7 Offshore Substations Chapter 3 General Safety Section 7 Table 7.2 Spaces below Fire integrity of decks separating adjacent spaces Spaces above 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 Control stations 2.1 A-0 A-0 A-0 A-0 A-0 A-60 A-0 A-0 A-0 Corridors 2.2 A-0 Accommodations spaces 2.3 A-60 A-0 3 3 Stairway 2.4 A-0 A-0 A-0 Service spaces (low risk) Machinery spaces of category A Other machinery spaces 3 A-0 A-0 2.5 A-15 A-0 A-0 A-0 2.6 A-60 A-60 A-60 A-60 A-60 3 3 3 A-60 A-0 A-0 A-0 A-60 A-0 A-0 A-0 A-0 A-60 A-0 A-0 A-0 3 A-60 A-0 A-0 A-0 1, 3 A-60 A-60 A-60 2.7 A-15 A-0 A-0 A-0 A-0 A-0 1 1, 3 A-0 A-0 3 A-0 3 3 3 3 Hazardous areas 2.8 A-60 A-0 A-0 A-0 A-0 A-60 A-0 -- A-0 -- A-0 Service spaces (high risk) Open decks 2.10 Sanitary and similar spaces Passive Fire Protection 2.9 A-60 A-0 A-0 A-0 A-0 A-0 A-0 A-0 A-0 2 3 A-0 3 3 3 3 3 3 3 2.11 A-0 A-0 3 A-0 3 -- A-0 A-0 A-0 A-0 3 3 3 3 3 -- A-0 A-0 A-0 A-0 3 3 3 Remarks 1 Where the space contains an emergency power source or components of an emergency power source adjoining a space containing a service generator or the components of a service generator, the boundary bulkhead or deck between those spaces shall be an A-60 class division 2 Where spaces are of the same numerical category and superscript 3 appears, a bulkhead or deck of the rating shown in the Tables is only required when the adjacent spaces are for a different purpose, e.g. in category 2.9. A galley next to a galley does not require a bulkhead but a galley next to a paint room requires an A-0 bulkhead. 3 The division is required to be of steel or equivalent material, but need not be of A class standard. However, where a deck is penetrated for the passage of electric cables, pipes and vent ducts, such penetrations shall be made tight to prevent the passage of flame and smoke. A.4.2 A.4.2.1 Application of the tables Tables 7.1 and 7.2 apply respectively to the bulkheads and decks separating adjacent spaces. A.4.2.2 For determining the appropriate fire integrity standards to be applied to divisions between adjacent spaces, such spaces are classified according to their fire risk as show in A above in Categories 2.1 to 2.11. The title of each category is intended to be typical rather than restrictive. The number preceding each category above refers to the applicable column or row in the Tables. A.4.3 In general, accommodation spaces, service spaces and control stations should not be located adjacent to hazardous areas. However, where it is not practicable, an engineering evaluation should be performed to ensure that the level of fire protection and blast resistance of the bulkheads and decks separating these spaces from the hazardous areas are adequate for the likely hazard. A.4.4 Bounderies to to external escape routes may have to constructed to A-60 standard depending on specific conditions, such as fire load, escape routes, number of personnel etc., to be agreed with GL. A.5 Structural requirements for doors, windows, stairways, ceilings, linings, etc. A.5.1 Fire and external doors External doors shall be constructed to "A-0" class division and be self-closing, where practicable. The construction of all doors and frames in "A" class divisions, including the means of securing them when Edition 2013 Germanischer Lloyd Page 7–4
Rules IV Industrial Services Part 7 Offshore Substations Chapter 3 General Safety Section 7 Passive Fire Protection closed, shall provide resistance to fire as well as to the passage of smoke and flames, as far as practicable, equivalent to that of the bulkheads in which the doors are situated. Such doors and door frames shall be constructed of steel or other equivalent material. Doors in "A" class divisions must be capable of being opened and closed from each side of the bulkhead by one person only. A.5.2 Intersections and penetrations In approving fire protection details, GL will have regard to the risk of heat transmission at intersections and thermal points of required thermal barriers. Where "A" class divisions are pierced for the passage of electric cables, pipes, trunks, ducts, etc., or for girders, beams or other structures, arrangements shall be made to ensure that the fire resistance is not impaired. Penetrations to be of approved type. If a space is divided with a deck or bulkhead of “A” class standard having insulation of different values, the insulation with the higher value should continue on the deck or bulkhead with the insulation of the lesser value for a distance of at least 450 mm. A.5.3 Windows GL permits windows outside hazardous areas to be of opening type. A.5.4 Corridors All bulkheads required to be "B" class divisions shall extend from deck to deck and to the deckhouse side or other boundaries, unless continuous "B" class ceilings or linings are fitted on both sides of the bulkhead, in which case the bulkhead may terminate at the continuous ceiling or lining. In corridor bulkheads, ventilation openings may be permitted only in and under the doors of cabins, public spaces, offices and sanitary spaces. The openings shall be provided only in the lower half of the door. Where such an opening is in or under a door, the total net area of any such opening or openings shall not exceed 0.05 m 2 . When such an opening is cut in a door it shall be fitted with a grille made of noncombustible material. Such openings shall not be provided in a door in a division forming a stairway closure. A.5.5 Stairs Stairs shall be constructed of steel or equivalent material. A.5.6 Stairways and lifts Stairways which penetrate only a single deck shall be protected at least at one level by "A" or "B" Class divisions and self-closing doors so as to limit the rapid spread of fire from one deck to another. Stairways and lift shafts which penetrate more than a single deck shall be surrounded by "A" class divisions and protected by self-closing doors at all levels. Self-closing doors shall not be fitted with hold-back hooks. However, hold-back arrangements incorporating remote release fittings of the fail-safe type may be utilized. Personnel lift trunks shall be protected by "A" class divisions. A.5.7 Air spaces Air spaces enclosed behind ceilings, paneling’s or linings shall be divided horizontally by close fitting draught stops spaced not more than 14 meters apart. In the vertical direction, such enclosed air spaces, including behind linings of stairways, trunks, etc. should be closed at each deck. A.5.8 Insulation Except for insulation in refrigerated compartments, insulation material, pipe and vent duct lagging, ceilings, linings and bulkheads shall be of non-combustible material. Insulation of pipe fittings for cold ser- Edition 2013 Germanischer Lloyd Page 7–5
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(IV-7-3) General Safety

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