A sea water desalination plant consisting of two single effect multistage flash evaporators of approximately 7000 m3/day (2MGD) capacity, operates since 1965 in Eilat, Israel. Scale prevention is necessary in order to assure economic operation; polyphosphate, pH-control (acid dosage) and organic scale inhibitors were used and their influence upon corrosion rate is discussed. Corrosion is measured by different methods during actual operation: probes, ultrasonic tests, eddy current, polarization resistance and concentration of iron and copper in brine. The usefulness of various scale preventives has been evaluated by laboratory investigations and by subsequent field tests which showed that corrosion rate decreased significantly without causing excessive fouling.

The effect of the various water treatment methods on the behavior of the plant is continuously processed by means of a computerized daily data performance program. Maintenance costs and outage time were considerably reduced, with a saving in energy and decrease of the cost of product water. The suitability of various constructional materials has also been evaluated and an attempt to estimate the useful life expectancy of the plant has been made.

Subject
Acids, Costs, Corrosion prevention, Water, Materials, Corrosion rate, Tubes, Scale inhibitors, Corrosion scales, Steel, Brines, Corrosion probes, Water treatment facilities
© 1981 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).
1981
Association for Materials Protection and Performance (AMPP)
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