Cylinder ancillary equipment connections

Cylinder valve outlet and inlet connections, cylinder ancillary equipment connections, transfer connections, and regulator connections have been standardized by the industry for the handling of specific types of compressed and liquefied gases and to prevent the misapplication of these potentially hazardous materials. Users of compressed gases are cautioned not to tamper with or replace connections supplied by an authorized gas supplier. 

For more detailed information about cylinder valve outlet and inlet connections, cylinder ancillary equipment connections, bulk transfer connections, and regulators, refer to Chapter 8. 

This section summarizes the requirements for gas cylinder ancillary equipment connections. 

Cylinder Valve, Cylinder Ancillary Equipment, and Bulk Transfer Connections... 

Cylinder Valve, Cylinder Ancillary Equipment, and Bulk Transfer Connections 149 Table 9-2. National Gas Taper (NGT) Threads (continued)... 

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. 

Pressurized gas ancillary equipment downstream from the cylinder valve outlet is joined to the system piping by various types of threaded connections. Such equipment includes pressure reducing regulators, gauges, flowmeters, and station valves (for example, manifold isolation valves, etc.). 

Pressure relief and safety devices have uniquely contributed to the safe utilization of compressed gases. Chapter 7 will provide insights into the evolution and systematic application of the various types of pressure relief devices now in use. Likewise, the systematic use of cylinder valve connections, connections to ancillary equipment, and bulk transfer connections has evolved into a methodology that is intended to help ensure that the proper gas is actually connected for the intended application. This methodology,... 

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