SU87-4

A removable U-tube bundle gives this configuration the thermal and mechanical margin expected of SU/WU equipment in steam-to-liquid heating. Steam condenses in the single-pass shell while the heated fluid travels the tubes. Physically, the unit runs a 8-inch shell, 84-inch shell length, and roughly 89-3/8 inches overall in a 4-pass arrangement. That works out to about 58 square feet of heat transfer surface on 3/4-inch O.D. tubes. The build specifies cast iron or brass bonnets, steel shell, copper tubes, and steel or brass tubesheets. The unit is rated for 150 PSI on the shell side, 150 PSI on the tube side, and 375°F maximum temperature. This build is designated SU87-4. Typical duty includes swimming pool heating, radiant panel and snow-melt converters, and instantaneous domestic water heating.