This publication applies to bulk compressed gas or cryogenic liquid product delivery and vapor return hose assemblies that are temporarily connected between the tank or any tank-mounted accessory and the point of supply or receipt during loading or off-loading. Transfer hoses may be stored on the transport vehicle or at the storage vessel.

This publication applies to transfer hoses with internal diameters ranging from 0.25 in to 4 in (6.4 mm to 102 mm) including:

• Uninsulated gas transfer hoses—Commonly used for tube trailer transfer of argon, nitrogen, helium, hydrogen and oxygen;
• Corrugated metal hoses (uninsulated cryogenic hoses and uninsulated gas transfer hose)—Commonly used for liquid argon, liquid nitrogen, liquid oxygen, and liquified natural gas;
• Vacuum-jacketed cryogenic hose—Commonly used for liquid hydrogen and liquid helium; and
• Composite transfer hoses—Commonly used for liquid carbon dioxide and gas transfer hoses.

NOTE—At times the terms for these four types of transfer hoses may be used interchangeably, e.g., a corrugated metal hose can also be referred to as an uninsulated cryogenic hose. This would also apply for composite transfer hoses and uninsulated gas transfer hoses.

This publication does not cover:

• cylinder pigtails;
• hose assemblies such as flexible joints or expansion joints in rigid piping systems that are part of the piping system and are pressure tested in accordance with ASME B31.3, Process Piping; or
• hose assemblies for hydrogen, liquefied petroleum gas, natural gas, or other fueling applications where the compressed gas or cryogenic fluid is transferred from a stationary vessel to a motor vehicle, fork truck, or other vehicle used for transportation.