Type 304 stainless steel (UNS S30400) pipe has been used successfully in the water distribution systems of four commercial buildings in a long term test in Japan. Water conditions were 50°C maximum, 20 ppm chloride, and less than 1ppm residual chlorine. Piping and a variety of connection mechanisms were evaluated after one, three, five and ten years. All of the stainless steel pipe was free of corrosion. No corrosion occurred on any of the welded joints, soldered joints, or pressed fittings. The compression joints exhibited localized attack of the cast bronze components. Lap joints suffered crevice corrosion.

Subject
Buildings, Pipe surfaces, Steel surfaces, Water, Piping, Compression, Fittings, Joints, Corrosion attacks, Deposit corrosion, Stainless steel, Potable water, Cleaning
Keywords:
Austenitic stainless steel, potable waters, low chloride, chlorine, buildings, pressed fittings, soldered joints, welds, compression fittings, lap joints
© 1997 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1997
Association for Materials Protection and Performance (AMPP)
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