seamless brass tube
Seamless copper tube used for the installation of nonflammable medical gases (and in some cases high-purity applications) where the gases being delivered are not considered flammable is manufactured to the requirements ofASTM B819 - Standard Specification for Seamless Copper Tube for Medical Gas Systems.
Medical gas tube may be provided in one of two types, type K or type L, in drawn (hard) H58 temper only. (Both of these types are defined and described in ASTM B88.) Alloy C12200 is the only alloy permitted for use for medical gas tube and is a minimum 99.9% pure copper (Cu) and silver (Ag) combined with no greater than 0.040% phosphorous (P).
Medical gas tube is required to be cleaned, by the manufacturer, so that the maximum interior surface residue does not exceed 0.0035 g/ft2 of interior surface. Cleaning techniques may be found in CGA G4.1 although the manufacturer is not limited to those procedures or practices. Medical gas tube is required, by the ASTM B 819 standard, to be identified with a continuous stripe of either green for type K or blue for type L containing the type of tube, the manufacturers name or trademark, the nation of origin at intervals not to exceed 3 feet. It is further required to be incised with the type of tube, the manufacturers name or trademark at intervals not to exceed 1½ foot. Acceptable additional required markings in the color appropriate for type K (green) or type L (blue) shall be "OXY", "MED", "OXY/MED", "OXY/ACR", "ACR/MED" .
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