scope:

This is the 13th edition (2013), as cited, when purchased you will also receive the current edition.

The scope of this standard is to provide connections that minimize the possibility of hazardous misconnections. This standard is based on a coordinated plan for the inclusion of future connections as they are required on cylinders that are not permanently manifolded during transport and use. Standard outlet connections for respective gases are fully defined and complete in themselves. The outlet connections are designed to minimize the possibility of hazardous misconnections.

Material specifications

Material specifications are not covered by this standard except where they are essential for maintaining the integrity of noninterchangeability between connections intended for different gas services. See connection nos. 860, 630, and 710. The chemical and physical properties of the gases, including pressure, shall be considered to determine the strength and suitability of materials used.

Commodities

Some of the commodities covered by this standard do not meet the generally accepted definition of "compressed gas" as defined by the U.S. Department of Transportation (DOT) [1].¹ Some products are handled in compressed gas cylinders. In these cases, the cylinder shall have the standard outlet to minimize hazardous misconnections even though it is not required for safe packaging.

Liquid and gas withdrawal

Standards for any of the liquefied gases are understood to be suitable for both liquid and gas withdrawal except where a connection standard is specified for liquid withdrawal.

Dimensional units

All dimensions are in inches (millimeters).

In 1970, the Canadian Parliament unanimously endorsed the White Paper on Metric Conversion in Canada, proposing the adoption of the most up-to-date metric system of measurement, système international d'unités or SI. The Metric Commission was established in June 1971 to prepare an overall plan for metric conversion. Today, many sectors of industry and commerce in Canada, including the gas industry, sell their products in metric sizes and packages. Since CGA V-1 is used in Canada, it is published with dual units. Conversion factors can be found in CGA P-11, Metric Practice Guide for the Compressed Gas Industry [2].

Metric thread dimensions have been rounded toward the interior of the tolerance zone. Maximum limits have been rounded downward, while minimum limits have been rounded upward. This method of rounding was selected to permit the use of existing gauges. Other dimensions have been rounded to the nearest significant digit.

Marking and labeling of containers

Although the main purpose in standardizing valve outlets is to prevent interconnection with noncompatible gases, relying only on the valve outlet as the sole method of preventing such interconnection is not advised. The primary means for identifying the contents of any container of compressed gas shall be by means of the chemical name or the commercially accepted name of the material legibly marked on the container.

All cylinders shall be well marked as to contents in accordance with CGA C-7, Guide to the Preparation of Precautionary Labeling and Marking of Compressed Gas Containers [3]. The user shall rely on such markings to identify contents and understand the properties of the gas or gases to be used to ensure system compatibility.

Effective date

Unless otherwise stated, the effective date of this edition of this standard is May 2013 and shall not be applied retroactively.

Blunting

Modification of the lead thread (blunting) is allowed as long as there is no loss of sealing or structural integrity. Blunting is used to reduce galling.

¹ References are shown by bracketed numbers and are listed in order of appearance in the reference section.