1 To prevent heat transmission at intersections and terminal points, the insulation of the deck or bulkhead should be carried past the intersection or terminal point for a distance of at least 450 mm in the case of steel and aluminium structures (see also figures 1 and 2 of regulation 26.4 in the appendix).
2 If a space is divided with a deck or a 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 (see also interpretation 2 of regulation II-2/26.4).
3 In cases where the lower part of the insulation has to be cut for drainage, the construction should be in accordance with the structural details in the appendix (see figure 3 of regulation 26.4 in the appendix).
4 Cable penetrations in "A" class divisions should be tested and approved in accordance with resolution A.754(18), appendix, A.IV.
For pipe penetrations, see interpretations of regulation II-2/18.2.1 and for duct penetrations, see interpretations of regulation II-2/16
1 Where pipes made of materials other than steel or copper are used on board, the following precautions should be taken:
.1 penetrations in "A" class divisions should be carried out in accordance with one of the following arrangements:
.1 a fire tested penetration device, suitable for the fire resistance of the division pierced and the type of pipe used, should be provided at the penetration; or
.2 a steel sleeve, having a thickness of not less than 4.5 mm and a length of not less than 900 mm (450 mm on each side of the division) should be provided at the penetration. The pipe should be connected to the ends of the sleeve by flanges or couplings; or the clearance between the sleeve and the pipe should not exceed 2.5 mm; or any clearance between pipe and sleeve should be made tight by means of non-combustible or other suitable material;
.3 reference is made to resolution A.753(18) and the Fire Test Procedures Code.
.2 penetrations in "B" class divisions should be carried out in accordance with one of the following arrangements:
.2 a steel sleeve, having a thickness of not less than 1.8 mm and a length of not less than 900 mm for pipe diameters of 150 mm or more and not less than 600 mm for pipe diameters of less than 150 mm (equally divided to each side of the bulkhead). The pipe should be connected to the ends of the sleeve by flanges or couplings; or the clearance between the sleeve and the pipe should not exceed 2.5 mm; or any clearance between pipe and sleeve should be made tight by means of non-combustible or other suitable material.
2 Uninsulated metallic pipes penetrating A-O or B-O class divisions should be of suitable material, the melting temperature of which exceeds 950°C for A-O and 850°C for B-O class divisions.
Reference is made to Publication 92 - Electrical Installations in Ships, published by the International Electrotechnical Commission.
The fire insulation in such spaces can be covered by metal sheets (not perforated) or by vapour proof glass cloth accurately sealed at the joint.
1 Paint lockers and flammable liquid lockers should be provided with a fire-extinguishing arrangement enabling the crew to extinguish a fire without entering the space.
2 For lockers of deck areas of 4 m2 or more and for those lockers with access to accommodation spaces, one of the fixed arrangements specified below should be provided:
3 Water spraying systems may be connected to the fire main of the ship.
4 Systems or arrangements other than those mentioned above may be accepted.
5 For lockers of a deck area of less than 4 m2, which do not give access to accommodation spaces, CO2 portable fire extinguisher(s) sized in accordance with 2 above, which can be discharged through a port in the boundary of the lockers may be accepted The required portable fire extinguishers should be stowed adjacent to the port. Alternatively, a port or hose connection may be provided for this purpose to facilitate the use of fire main water.