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 296-24-93501 - Definitions

Current through Register Vol. 24-14, July 15, 2024
Cargo tank.
Any container designed to be
				  permanently attached to any motor vehicle or other highway vehicle and in which
				  is to be transported any compressed gas. The term "cargo tank" shall not be
				  construed to include any tank used solely for the purpose of supplying fuel for
				  the propulsion of the vehicle or containers fabricated under specifications for
				  cylinders.
Code.
Paragraph U-68, U-69, U-200, or U-201 of
				  section VIII of the Boiler and Pressure Vessel Code of the American Society of
				  Mechanical Engineers, 1949 Edition, or section VIII of the Boiler and Pressure
				  Vessel Code of the American Society of Mechanical Engineers, 1950, 1952, 1956,
				  1959, and 1962 Editions; or the Code for Unfired Pressure Vessels for Petroleum
				  Liquids and Gases of the American Petroleum Institute and the American Society
				  of Mechanical Engineers (API-ASME), 1951 Edition.
DOT design pressure.
The "DOT design pressure"
				  is identical to the term "maximum allowable working pressure" as used in the
				  "code" and is the maximum gage pressure at the top of the tank in its operating
				  position. To determine the minimum permissible thickness of physical
				  characteristics of the different parts of the vessel, the static head of the
				  lading shall be added to the DOT design pressure to determine the thickness of
				  any specific part of the vessel. If vacuum insulation is used, the liquid
				  container shall be designed for a pressure of 15 p.s.i. more than DOT design
				  pressure, plus static head of the lading.
EXCEPTION: For containers constructed in accordance with
				  paragraph U-68 or U-69 of section VIII of the ASME Boiler and Pressure Vessel
				  Code, 1949 Edition, the maximum allowable working pressure for the purpose of
				  these standards is considered to be 125% of the design pressure as provided in
				  49 C.F.R.
				  173.315 of DOT regulations.
DOT regulations.
Refers to 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 valve.
Flow rating pressure.
The pressure at which a
				  safety relief device is rated for capacity.
Frangible disc.
A safety relief device in the
				  form of a disc, usually of metal, 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.
A safety relief device 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.
Portable tank.
Any container designed primarily
				  to be temporarily attached to a motor vehicle, other vehicle, railroad car
				  other than tank car, or marine vessel, and equipped with skids, mountings, or
				  accessories to facilitate handling of the container by mechanical means, in
				  which is to be transported any compressed gas. The term "portable tank" shall
				  not be construed to include any cargo tank, any tank car tank or any tank of
				  the DOT-106A and DOT-110A-W type.
Resealing pressure.
The pressure at which
				  leakage ceases through a water seal of not over 4 inches on the outlet of the
				  safety relief valve.
Safety relief device.
A device intended to
				  prevent rupture of a container under certain conditions of exposure.
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.
A safety relief valve is the
				  pressure marked on the valve and at which the valve is set to
				  start-to-discharge.
Start-to-discharge pressure.
The pressure at
				  which the first bubble appears through a water seal of not over 4 inches on the
				  outlet of the safety relief valve.
Note: When the nature of the service requires the use of a
				  metal-to-metal seat safety relief valve, with or without secondary sealing
				  means, the start-to-discharge pressure may be considered the pressure at which
				  an audible discharge occurs.
Order 73-5, § 296-24-93501, filed 5/9/73 and Order
					 73-4, § 296-24-93501, filed 5/7/73.