108.131—Definitions.
(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:
(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°C. (250°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°C. (325°F.) above the temperature before the standard fire test.
(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:
(e)
Stairtower means a stairway that penetrates more than one deck within the same enclosure, or two or more stairways that—
(f)
Accommodation space includes, sleeping, mess, hospital, recreational, toilet, washing and shower spaces, and corridors.