Scale control at high LSI and high pH without acid feed is difficult to achieve. The problem dramatically increases in cooling towers when PVC tower film fill is used. Compounds that are able to enhance the performance of typical scale inhibitors have been developed. When topped off with these enhancing compounds, typical scale inhibitors are able to control calcium carbonate and silicate - related scale formation on metal heat exchanger and cooling water tower film fill surfaces in cycled waters having high LSI (~3.0), high alkalinity (500-700 mg/L as CaCO3), and high pH (8.5 or higher). The enhancing compounds have excellent chlorine and soluble iron tolerance and are compatible with traditional biocides.

Subject
Acids, Films, Chemical compounds, Water, Metal surfaces, Calcium carbonate, Scale inhibitors, Calcium, Acidity, Condensers, Heat exchangers, Corrosion inhibitors, Towers
Keywords:
scale, deposit, inhibition, calcium carbonate, cooling tower, tower film fill, non-acid feed
© 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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