Copper release from 90/10 Cu/Ni metallurgy under feedwater and condensate conditions was investigated. Effluent copper concentrations were measured as a function of pH, temperature, flow rate, amine type, amine concentration and dissolved oxygen concentration using a heat exchanger containing a 90/10 Cu/Ni coil.

Temperature had the largest impact on copper concentration. As the temperature was raised from that expected in condensate systems to that expected in feedwater heaters, the average copper concentration increased dramatically. All other factors except flow rate had smaller but significant effects on copper concentration. Changing flow rate had no effect.

Ammonia behaved differently than cyclohexylamine, morpholine and diethylaminoethanol. With all other factors held constant, increasing ammonia concentration increased the copper concentration, while increasing organic amine concentrations decreased the copper concentration.

Injection of acid into the coil effluent sample line was needed to obtain accurate copper concentrations.

Subject
Coils, Water, Effluent, Ammonia, Acidity, Feedwater, Amines, Contours, Boilers, Oxygen, Dissolved oxygen, Copper, Sampling
© 1989 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).
1989
Association for Materials Protection and Performance (AMPP)
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