Page 366 - Ship Construction.DJ Eyres 6Ed

Ch32-H8070.fm Page 355 Wednesday, October 18, 2006 7:06 AM
Structural Fire Protection 355
above the original temperature when the material is subjected to the stan-
dard fire test within the following times.

Class Time
(min)
B–15 15
B–0 0
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‘C’ class divisions are constructed of approved incombustible materials but
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
do not need to meet with any specified requirements relative to passage of
smoke and flame nor temperature rise.
The standard fire test referred to is a test in which a specimen of the divi-
sion with a surface area of not less than 4.65sq.m and height or length of
2.44 m is exposed in a test furnace to a series of time-temperature relation-
ships, defined by a smooth curve drawn through the following points.

At end of first 5 minutes 538 °C
At end of first 10 minutes 704 °C
At end of first 30 minutes 843 °C
ึ
At end of first 60 minutes 927 °C
Some typical examples of fire divisions are given below for a passenger ship
carrying more than thirty-six passengers.

Bulkhead Adjacent compartments Class

Main fire zone Galley/passageway A–60
Main fire zone Wheelhouse/passageway A–30
Within fire zone Fan room/stairway A–15
Within fire zone Cabin/passageway (non-sprinklered zone) B–15
Within fire zone Cabin/passageway (sprinklered zone) B–0

Openings in Fire Protection Divisions

Generally openings in fire divisions are to be fitted with permanently
attached means of closing which have the same fire resisting rating as the
division. Suitable arrangements are made to ensure that the fire resistance
of a division is not impaired where it is pierced for the passage of pipes,
vent trunks, electrical cables, etc.
Greatest care is necessary in the case of openings in the main fire zone
divisions. Door openings in the main fire zone bulkheads and stairway
enclosures are fitted with fire doors of equivalent fire integrity and are