Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-24 - General safety and health standards › Part K - COMPRESSED GAS AND COMPRESSED GAS EQUIPMENT › Section 296-24-93001 - Definitions

Current through Register Vol. 24-14, July 15, 2024
Approach channel.
The passage or passages
				  through which gas must pass from the cylinder to reach the operating parts of
				  the safety relief device.
Combination frangible disc-fusible plug.
A
				  frangible disc in combination with a low melting point fusible metal, intended
				  to prevent its bursting at its predetermined bursting pressure unless the
				  temperature also is high enough to cause yielding or melting of the fusible
				  metal.
Combination safety relief valve and fusible
				  plug.
A safety relief device utilizing a safety relief valve in
				  combination with a fusible plug. This combination device may be an integral
				  unit or separate units and is intended to open and to close at predetermined
				  pressures or to open at a predetermined temperature.
Compressed gas in solution (acetylene).
A
				  nonlique-fied gas which is dissolved in a solvent.
Discharge channel.
The passage or passages
				  beyond the operating parts through which gas must pass to reach the atmosphere
				  exclusive of any piping attached to the outlet of the device.
DOT regulations.
As used in these standards "DOT
				  regulations" refers to the U.S. Department of Transportation Regulations for
				  Transportation of Explosives and Other Dangerous Articles by Land and Water in
				  Rail Freight, Express and Baggage Services and by Motor Vehicle (Highway) and
				  Water, including Specifications for Shipping Containers, Code of Federal
				  Regulations,
				  Title
				  49, Parts 171 to 178.
Flow capacity.
The capacity in cubic feet per
				  minute of free air discharged at the required flow rating pressure of a safety
				  relief device.
Flow rating pressure.
The pressure at which a
				  safety relief device is rated for capacity.
Frangible disc.
An operating part in the form of
				  a disc, usually of metal and which is so held as to close the safety relief
				  device channel under normal conditions. The disc is intended to burst at a
				  predetermined pressure to permit the escape of gas.
Free air or free gas.
Air or gas measured at a
				  pressure of 14.7 pounds per square inch absolute and a temperature of
				  60°F.
Fusible plug.
An operating part in the form of a
				  plug of suitable low melting material, usually a metal alloy, which closes the
				  safety relief device channel under normal conditions and is intended to yield
				  or melt at a predetermined temperature to permit the escape of gas.
Liquefied compressed gas.
A gas which, under the
				  charging pressure, is partially liquid at a temperature of 70°F. A
				  flammable compressed gas which is normally nonliquefied at 70°F but which
				  is partially liquid under the charging pressure and temperature, shall follow
				  the requirements for liquefied compressed gases.
Nonliquefied compressed gas.
A gas, other than a
				  gas in solution which under the charging pressure, is entirely gaseous at a
				  temperature of 70°F.
Operating part.
The part of a safety relief
				  device that normally closes the safety discharge channel but when moved from
				  this position as a result of the action of heat or pressure, or a combination
				  of the two, permits escape of gas from the cylinder.
Pressure opening.
The orifice against which the
				  frangible disc functions.
Pressurized liquid compressed gas.
A compressed
				  gas other than a compressed gas in solution, which cannot be liquefied at a
				  temperature of 70°F, and which is maintained in the liquid state at a
				  pressure not less than 40 p.s.i.a. by maintaining the gas at a temperature less
				  than 70°F.
Rated bursting pressure.
The maximum pressure
				  for which the disc is designed to burst when in contact with the pressure
				  opening for which it was designed when tested.
Reinforced fusible plug.
A fusible plug
				  consisting of a core of suitable material having a comparatively high yield
				  temperature surrounded by a low-melting point fusible metal of the required
				  yield temperature.
Safety relief device.
A "safety relief device"
				  is a device intended to prevent rupture of a cylinder under certain conditions
				  of exposures. (The term as used herein shall include the approach channel, the
				  operating parts, and the discharge channel.)
Safety relief device channel.
The channel
				  through which gas released by operation of the device must pass from the
				  cylinder to the atmosphere exclusive of any piping attached to the inlet or
				  outlet of the device.
Safety relief valve.
A safety relief device
				  containing an operating part that is held normally in a position closing the
				  safety relief device channel by spring force and is intended to open and to
				  close at predetermined pressures.
Set pressure.
The pressure marked on the valve
				  and at which it is set to start-to-discharge of a safety relief valve.
Start-to-discharge pressure.
The pressure at
				  which the first bubble appears through a water seal of not over 4 inches in the
				  outlet of the safety relief valve.
Test pressure of the cylinder.
The minimum
				  pressure at which a cylinder must be tested as prescribed in DOT specifications
				  for compressed gas cylinders 41 C.F.R. Ch. 1.
Yield temperature.
The temperature at which the
				  fusible metal or alloy will yield when tested in a fusible
				  plug.
Order 73-5, § 296-24-93001, filed 5/9/73 and Order
					 73-4, § 296-24-93001, filed 5/7/73.