It is necessary to protect the external surfaces of steel pipe used in underground service for gas and oil transmission and distribution, from electrolytic and chemical corrosion. The pipe is generally protected with bituminous coatings and paper wrap, or extruded plastic coatings. The latest development is to heat shot-blasted pipe and electrostatically deposit a layer of plastic powder. Residual heat in the pipe causes fusion of the plastic which forms a mechanically smooth, chemical and electrical resistant, durable coating. A description of installations coating small (2 in-12 in diameter) and large (36 in-48 in diameter) pipe at production speeds of 20 to 100 fpm depending on size, is provided in this paper. Varying films up to 14 mils average thickness are easily applied by these methods.

Subject
Primers, Liquid coatings, Materials, Piping, Voltage, Spray coating, Epoxy coatings, Powder coatings, Plastics, Heat, Powders, Equipment, Epoxies
© 1969 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).
1969
Association for Materials Protection and Performance (AMPP)
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