EN 739:1998

Low-pressure hose assemblies for use with medical gases

Publication date:   Mar 19, 2004

Scope

1.1 This European Standard specifies requirements for low-pressure hose assemblies intended for use with the following medical gases: - oxygen; - nitrous oxide; - air for breathing; - helium; - carbon dioxide; - xenon; - specified mixtures of the gases listed above; - air for driving surgical tools; - nitrogen for driving surgical tools; - vacuum. It is intended especially to ensure gas-specificity and to prevent cross-connection between different gases. These hose assemblies are intended to be used in the pressure range between 300 kPa and 1400 kPa for compressed medical gases and between 10 kPa and 100 kPa absolute pressure for vacuum. 1.2 This European Standard does not specify the intended uses of hose assemblies. Some examples of the intended uses specified in other standards are as follows: a) between a terminal unit and medical equipment (see EN 737-1, prEN 740, EN 794-1); b) between the fixed pipeline system and a terminal unit of that system (see prEN 737-3, EN 793); c) between a terminal unit and a second terminal unit (see prEN 737-3); d) between an emergency supply and an emergency and maintenance inlet point of a pipeline system (see EN 738-1, prEN 737-3); e) between an emergency supply and medical equipment (see EN 738-1, prEN 740, EN 794- 1). 1.3 This European Standard specifies the dimensions of non-interchangeable screw-threaded (NIST) connectors. 1.4 This European Standard does not specify: - dimensions of probes and of the mating parts of the socket (see prEN 737-6); - requirements for hose assemblies for anaesthetic gas scavenging systems; - requirements for coaxial hoses used for the supply and disposal of air for driving surgical tools; - requirements for electrical conductivity.

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