US3420297A Heat exchanger tube support
Stein Industrie Heat exchanger tube support plate fits in grooves in ends of fixed ring inside exchanger US4359088A en 1980 11 21 1982 11 16 The Babcock Wilcox Company Steam generator tube supports US4573528A en 1981 01 08 1986 03 04 Georges Trepaud Heat exchangers with clusters of straight or corrugated tubes especially to systems for supporting the tubes