07248 Evaluation of Materials for Seawater Plate Heat Exchanger Applications

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Product Number: 51300-07248-sg

ISBN: 07248 2007 CP

Author: James R. Crum, Lewis E. Shoemaker, Paul Hazeldine, and Julian Peschel

Publication Date: 2007

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Tube-to-tube and gasketed plate heat exchangers are used for a variety of applications on ships, offshore oil platforms, and at coastal locations where seawater is employed as a cooling medium and marine corrosion is likely. The corrosivity of the seawater is often increased by the addition of chlorine to control marine life in such systems. While commercially pure (C.P.) titanium and titanium alloys offer excellent resistance in this type of equipment, these materials are currently in very limited supply. Thus, designers are being forced to consider alternate corrosion-resistant materials. Nickel-chromium-molybdenum corrosion-resistant alloys such as 625 (N06625), C-276 (N10276), 22 (N06022), and 686 (N06686) and super-austenitic stainless steels such as alloys 25-6MO (N08926) and 27-7MO (S31277) offer high strength and formability along with resistance to corrosion. This paper presents data developed from testing of actual heat exchangers as well as laboratory coupon exposures in sea water at elevated temperature. The corrosion resistance of these alloys under typical marine heat exchanger conditions along with details of their mechanical properties and fabricability are described. By taking advantage of the excellent corrosion resistance and mechanical properties of these alloys, it is shown that they are cost-effective candidates for this application and offer long, reliable service.