>>>The Compressed Gas Association in conjunction with the >>>D.O.T. have put out a large hard bound book entitled >>>"Handbook of Compressed Gases" in it is all the info for >>>colors of cylinders containing comp. gas.. it states that >>>Air in the U.S. is to be marked yellow. >>>Air in Canada is to be marked white and black. >>>o2 in the U.S.is to be marked green. >>>o2 in canada is white. >>>also the methods of cleaning that are approved are as follows.. >>>Steam or Hot water cleaning. >>>Caustic Cleaning >>>Acid Cleaning >>>Solvent Washing >>>Vapor Degreasing >>>Mechanical Cleaning >The above methods also include detailed methods of inspection >and procedures. This book is very comprehensive and also >includes finished dimensions of all valves and tank threads. Library of Congress Number ISBN: 0-442-25419-9
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