(a) Standard Fire Test means the test in which specimens of the relevant bulkheads or decks, having a surface of approximately 4.65 square meters (50 square feet) and a height of 2.44 meters (8 feet) resembling as closely as possible the intended construction and including, where appropriate, at least one joint, are exposed in a test furnace to a series of temperature relationships approximately as follows:
(1) At the end of 5 minutes--538 [deg]C. (1,000 [deg]F.)
(2) At the end of 10 minutes--704 [deg]C. (1,300 [deg]F.)
(3) At the end of 30 minutes--843 [deg]C. (1,550 [deg]F.)
(4) At the end of 60 minutes--927 [deg]C. (1,700 [deg]F.).
(b) Bulkheads and decks are defined and classed as follows:
(1) A class bulkhead or deck means a bulkhead or deck that--
(i) Is made of steel or other equivalent material; and
(ii) Prevents the passage of flame and smoke for 60 minutes if subjected to the standard fire test.
(2) A 60 bulkhead or deck means an A class bulkhead or deck that--
(i) Is insulated with approved insulation, bulkhead panels, or deck covering;
(ii) If subjected to the standard fire test for 60 minutes, has an average temperature rise on the unexposed side of the insulated bulkhead or deck of less than 139 [deg]C. (250 [deg]F.) above the temperature before the standard fire test and has a temperature rise at any point on the unexposed surface, including any joint, of less than 180 [deg]C. (325 [deg]F.) above the temperature before the standard fire test.
(3) B class bulkhead or deck means a bulkhead or deck that--
(i) Is made of approved noncombustible material;
(ii) Prevents flame from passing through it for 30 minutes if subjected to the standard fire test.
(4) C class bulkhead or deck means a bulkhead or deck made of approved noncombustible material.
(c) Equivalent material means a material that by itself or with insulation has smoke and fire retardant properties equal to that of the steel required for ``A'' or ``B'' class bulkheads or decks and has structural qualities equivalent to steel at the end of the applicable fire exposure.
(d) Approved material means a material approved under one of the following subparts of Subchapter Q of this chapter:
(1) Deck coverings, Subpart 164.006.
(2) Structural insulation, Subpart 164.007.
(3) Bulkhead panel, Subpart 164.008.
(4) Noncombustible materials, Subpart 164.009;
(5) Interior finishes, Subpart 164.012.
(e) Stairtower means a stairway that penetrates more than one deck within the same enclosure, or two or more stairways that--
(1) Are arranged vertically one above the other; or
(2) Penetrate both the deck and the overhead within the same enclosure.
(f) Accommodation space includes, sleeping, mess, hospital, recreational, toilet, washing and shower spaces, and corridors.