The following words and terms shall, for the purposes of this chapter and as used elsewhere in the code, have the meanings shown herein.
CONTINUOUS GAS-DETECTION SYSTEM.
A gas detection system where the analytical instrument is maintained in continuous operation and sampling is performed without interruption. Analysis is allowed to be performed on a cyclical basis at intervals not to exceed 30 minutes.
A fully enclosed, noncombustible enclosure used to provide an isolated environment for compressed gas
containers in storage or use, including any doors and access ports for exchanging containers and accessing pressure-regulating controls.
A separately ventilated, fully enclosed room in which only compressed gases and associated equipment and supplies are stored or used.
HAZARDOUS PRODUCTION MATERIAL (HPM).
or gas associated with semiconductor manufacturing that has a degree-of-hazard rating in health, flammability or reactivity of Class 3
or 4 as ranked by NFPA 704 and that is used directly in research, laboratory or production processes that have as their end product materials that are not hazardous.
A room used in conjunction with or serving a Group H-5 occupancy
, where HPM is stored or used and that is classified as a Group H-2, H-3 or H-4 occupancy
IMMEDIATELY DANGEROUS TO LIFE AND HEALTH (IDLH).
The concentration of air-borne contaminants that poses a threat of death, immediate or delayed permanent adverse health effects, or effects that could prevent escape from such an environment as established by the National Institute of Occupational Safety and Health (NIOSH) based on both toxicity and flammability. It generally is expressed in parts per million by volume (ppm v/v) or milligrams per cubic meter (mg/m3
). If adequate data do not exist for precise establishment of IDLH concentrations, an independent certified industrial hygienist, industrial toxicologist, appropriate regulatory agency or other source approved by the Fire Commissioner
shall make such determination.
A material that has a melting point that is equal to or less than 68°F (20°C) and a boiling point
that is greater than 68°F (20°C) at 14.7 pounds per square inch absolute (psia) (101 kPa). When not otherwise identified, the term "liquid
" includes both flammable and combustible liquids
LOWER FLAMMABLE LIMIT (LFL).
The minimum concentration of vapor in air at which propagation of flame will occur in the presence of an ignition source. The LFL is sometimes referred to as "LEL" or "lower explosive
A material that has a melting point, decomposes or sublimates at a temperature greater than 68°F (20°C).