scope:

The Compressed Gas Association has prepared this standard as a guide for cargo tank hose users in establishing their own hose requalification procedures and standards in carbon dioxide refrigerated liquid transfer service applications. This publication is primarily written for elastomer carbon dioxide hoses, but the general inspections may be applied to hoses for other commodities. It should be understood that this is a minimum standard and may not cover all circumstances for every hose installation and lading. Each user can expect to modify this minimum standard to suit the user's own installation and conditions of service. Acceptance for continued service in accordance with these limits does not guarantee that a hose or coupling assembly is not dangerous or without the possibility of impending failure. These procedures represent the best currently available industry practice.

This standard is recommended as being limited in application to hose of the following characteristics:

- having an inner tube of natural or synthetic elastomer using reinforcement material consisting of a ply or plies of textile fabric or yarn and/or metal wire braid and enveloped with an outer protective cover; and

- internal diameters from 1/4 in to 4 in (6.4 mm to 102 mm) and maximum rated working pressures from over 125 psig (860 kPa) up to and including 500 psig (3450 kPa).² See CGA G-6.6, Standard for Elastomer- Type Carbon Dioxide Bulk Transfer Hose, for additional information concerning construction of hoses to which this standard applies [5].

Standards for the requalification of low pressure hose having 125 psig (860 kPa) and lower maximum rated working pressures used in services such as the transfer of flammable liquids and combustible liquids should be obtained from the appropriate standards sources. In addition, cryogenic liquids and certain compressed gases such as chlorine require the use of metal hose or hose with metal liners, and users should refer to the specified industry standards or to the manufacturers of such hose with regard to recommendations for reinspection and retesting procedures.

² kPa shall indicate gauge pressure unless otherwise noted as (kPa, abs) for absolute pressure or (kPa, differential) for differential pressure. All kPa values are rounded off per CGA P-11, Metric Practice Guide for the Compressed Gas Industry [4].