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McQuay Ice Machine Tube Sheets Repair and Protection

Tube type heat exchanger is a kind of heat-exchange equipment widely used in industrial production, which consists of shell, tube sheet, heat exchange tube, shell cover and deflection baffle with the material of ordinary steel, red copper or stainless steel. Usually, the tube bundles and tube sheet are welded or expanded together. Heat exchanger leakage is a common problem mainly caused by corrosion; only a few is due to heat exchanger model selection or manufacturing defect problem. During operation, tube sheet contacts with industrial cooling water, so the impurities, salts, gases and microorganism in cooling water will corrode the tube sheet and welding seam. From the outside, tube sheet surface will have some corrosion deposits and all sizes of pits. Additional, bimetallic corrosion takes place between tube sheet and heat exchange tube. Due to the effects of medium corrosion and temperature stress changes, the connection part between tube sheet and heat exchange tube is prone to have leakage problem, resulting in heat exchanger failure and affecting safety production.

Generally, it is difficult to solve the corrosion leakage problem again by welding, as well as replacement will cost more and take longer time. Micava high polymer composite has superior adhesion strength and corrosion resistance property, which can repair on site and eliminate the possibility of leakage resulted from secondary expansion deformation and high replacement cost.

 

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