Compressed Gas Association standards

CGA Pamphlet V-l-87, American Canadian and Compressed Gas Association Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections, ANSI, B57.1 CSA B96, 1987. 

Every utility that is provided should be properly identified with a clear, unambiguous label. Color-coded discs with engraved name labels which screw into each service fixture are available from at least one company for most common service utilities. All fittings and connectors should be provided according to appropriate standards. For example, aU gas fittings should comply with the provisions of the Compressed Gas Association Standard V-l(1994). Every utility, if used improperly, can cause safety problems, the only difference being that some require more of an effort on the part of a user todo so than do others. 

Container valve connections that do not fit must not be forced. Threads on regulator connections or other auxiliary requirements must match those on the container valve outlet. The valve outlet connection should conform to recognized standards such as ANSI/CGA V-1, American National, Compressed Gas Association Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections [14]. However, it must be acknowledged that connections other than those found in ANSI/CGA V-1 may exist. If a user chooses such a connection, extreme care must be taken to ensure that such connections do not cross-connect with existing connections in ANSI/CGA V-1, and that they have been properly engineered for the intended gas service and pressure. The threads on a cylinder valve outlet, as well as on regulators and other ancillary equipment, should be examined at frequent intervals to ensure they are clean and undamaged. 

Many valve outlet and inlet connections have been standardized by CGA for the different families of gases to prevent the interchange of regulator equipment between gases that are not compatible. These standardized connections have been adopted by the American National Standards Institute (ANSI) and CSA. Refer to Chapter 9 and ANSI/CGA V-1, American National, Compressed Gas Association Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections [6]. 

CGA V-9, Compressed Gas Association Standard for Compressed Gas Cylinder Valves, 2nd ed.. Compressed Gas Association, Inc., 1725 Jefferson Davis Highway, Arlington, VA 22202. 

Cylinder neck threads must be examined whenever the valve is removed from the cylinder. When manufactured, cylinders have a specified number of full threads of proper form as required in applicable thread standards. More information on this can be found in CGA V-1, American National, Canadian, and Compressed Gas Association Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections. [21] When inspected, cylinders must be rejected if the required number of effective threads has been reduced so that a gas-tight seal cannot be obtained by reasonable valving methods. Common thread defects are worn or corroded crests and broken or nicked threads. 

Regardless of the type of hydrostatic testing method used, DOT and TC regulations both specify that the periodic retest must include an external and internal visual examination of the cylinder. It is recommended that these inspections be conducted prior to the hydrostatic retest in accordance with the applicable Compressed Gas Association standards. See references [13] through [16] and [20]. External and internal inspection considerations were discussed more thoroughly in previous sections of this chapter. 

The standard valve outlet connection in the United States and Canada for acetylene cylinders over 50 ft (1.41 m ) is Connection CGA 510. The limited standard connection in the United States and Canada is Connection CGA 300. Small valve series limited standard connections for the United States and Canada are Connections CGA 200 for cylinders of approximately 10 ft (280 L) and Connection 520 for cylinders between 35 and 75 ft (970 L and 2.12 m ). Additional information may be found in CGA V-1, American National, Canadian, and Compressed Gas Association Standard for Compressed Gas Cylinder Outlet and Inlet Connections. [16]... 

Standard connections in the United States and Canada for argon cylinders are as follows for service pressure up to 3000 psig (20 684 kPa), Connection CGA 580 for 3001 to 5500 psig (20 691 to 37 921 kPa), Connection CGA 680 for 5501 to 7500 psig (37 928 to 51 711 kPa), Connection CGA 677 and for cryogenic liquid withdrawal. Connection CGA 295. The standard connections for cylinders are shown in CGA V-1, American National, Canadian, and Compressed Gas Association Standard for Compressed Gas... 

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