摘要：

A corrosion-resistant alloy metal tube sheet used to construct a shell and tube heat exchanger ( 50 ) for cooling fluids with sea water passing through corrosion-resistant alloy tubes ( 25 ) contained in a horizontal carbon steel outer shell ( 1 ) that are supported and sealed at each end by passing them through holes ( 27, 30 ) in a carbon steel tube sheet ( 28, 31 ) and axially aligned holes ( 36, 37 ) in alloy tube sheets ( 34, 35 ) that cover and protect the adjacent interior carbon steel tube sheets from sea water corrosion. The walls of the holes ( 27, 30, 36, 37 ) have at least one annular groove ( 45, 46 ) and the ends of each tube are radially expanded to form circumferential ridges ( 40, 41 ) on the outside of each tube at a mating location with each of said annular grooves ( 45, 46 ) where they are forcibly driven into the grooves to form a circumferential joint having good mechanical strength and water tightness, thereby eliminating the need for welding the external joint between the alloy tube sheets and alloy tubes.

展开