Gas Cylinder Safety Guidelines

Gas Cylinder Safety Guidelines 24 Highly Toxic Gas - A material which produces a lethal dose concentration that falls within any of the following categories: A chemical that has a median lethal dose (LD 50 ) of 50 milligrams or less per kilogram of body weight when administered orally to albino rats weighing between 200 and 300 grams each. A chemical that has a median lethal dose (LD 50 ) of 200 milligrams or less per kilogram of body weight then administered by continuous contact for 24 hours (or less if death occurs within 24 hours) with the bare skin of albino rabbits weighing between two and three kilograms each. A chemical that has a median lethal concentration (LC 50 ) in air of 200 parts per million by volume or less of gas or vapor, or 2 milligrams per liter or less of mist, fume, or dust, when administered by continuous inhalation for 1 hour (or less if death occurs within 1 hour) to albino rats weighing between 200 and 300 grams each. High Pressure Gas - A gas in a container that has a pressure of 3448 kPa (500 psig) or higher at 21.1 ° C (70 ° F). Inert Gas - A gas which is chemically inactive. Liquefied Gas - A fluid within a pressurized container, other than in solution, which exists both as a liquid and gas at 20 ° C (68 ° F). Examples include propane, butane, ammonia, carbon dioxide, and sulfur dioxide. Manifold - A gas distribution system which transfers product through multiple outlets/inlets to or from compressed gas containers. Nonflammable Gas - A gas which, within the packaging, exerts an absolute pressure of 280 kPa (40psi) or greater at 20 ° C (68 ° F) but is not a flammable gas as defined previously. Oxidizing Gas - A gas that can support and accelerate combustion of other materials. Poison Gas - Defined by DOT in 49 CFR 173.133. See Toxic Gas. Pressure Regulator - Amechanical device used to safely control the discharge pressure of a compressed gas from a container. Pressure Relief Device - A pressure and/or temperature activated device used to prevent the pressure from rising above a predetermined maximum and thereby prevent rupture of a pressurized container. Pyrophoric Gas - A gas that will spontaneously ignite in air at or below 54.4 ° C (130 ° F). Examples include silane and phosphine. SCF - One standard cubic foot of gas at 21 ° C (70 ° F) and 101.325 kPa (14.696 psia). Storage - Holding of gas, in its packaging, either on a temporary basis or for an extended period in such a manner as to not constitute usage of the gas. Toxic Gas - A chemical falling within any of the following categories: A chemical that has a median lethal dose (LD 50 ) of more than 50 milligrams per kilogram, but not more than 500 milligrams per kilogram of body weight when administered orally to albino rats weighing between 200 and 300 grams each. A chemical that has a median lethal dose (LD 50 ) of more than 200 milligrams per kilogram but