CFR > Title 46 - Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER I—CARGO AND MISCELLANEOUS VESSELS (parts 90 to 105) > PART 92—CONSTRUCTION AND ARRANGEMENT > SUBPART 92.07—Structural Fire Protection (§92.07-1 to §92.07-90) > 92.07-5—Definitions.

92.07-5—Definitions.

(a) Standard fire test. A “standard fire test” is one which develops in the test furnace a series of time temperature relationships as follows:
5 minutes—1,000 °F.
10 minutes—1,300 °F.
30 minutes—1,550 °F.
60 minutes—1,700 °F.
(b) “A” Class divisions. Bulkheads or decks of the “A” Class shall be composed of steel or equivalent metal construction, suitably stiffened and made intact with the main structure of the vessel; such as shell, structural bulkheads, and decks. They shall be so constructed, that if subjected to the standard fire test, they would be capable of preventing the passage of flame and smoke for one hour.
(c) “B” Class bulkheads. Bulkheads of the “B” Class shall be constructed with approved incombustible materials and made intact from deck to deck and to shell or other boundaries. They shall be so constructed that, if subjected to the standard fire test, they would be capable of preventing the passage of flame for one half hour.
(d) “C” Class divisions. Bulkheads or decks of the “C” Class shall be constructed of approved incombustible materials, but need meet no requirements relative to the passage of flame.
(e) Steel or other equivalent metal. Where the term “steel or other equivalent metal” is used in this subpart, it is intended to require a material which, by itself or due to insulation provided, has structural and integrity qualities equivalent to steel at the end of the applicable fire exposure.
(f) Approved material. Where in this subpart approved materials are required, they refer to materials approved under the applicable subparts of Subchapter Q (Specifications) of this chapter, as follows:
Deck Coverings 164.006
Structural Insulations 164.007
Bulkhead Panels 164.008
Incombustible Materials 164.009
Interior Finishes 164.012
(g) Stairtower. A stairtower is a stairway which penetrates more than a single deck within the same enclosure.
[CGFR 65-50, 30 FR 16983, Dec. 30, 1965, as amended by CGFR 67-90, 33 FR 1015, Jan. 26, 1968; CGD 75-032, 41 FR 17910, Apr. 29, 1976]