147 sq.ft. SS Heat Exchanger, by Ward Tank, S/N: BW425, (68) – .75" O.D. x 11’ long stainless steel tubes, rated 75 PSI @ 100°F. 10" dia. stainless steel shell, rated 75 PSI @ 100°F. Shell-1 pass, Tubes-1 pass, Horizontal. OAL: 12’ 10â€. NB: 107. Type: BEM.