5-277-14-078-001

A double-wall two-pass U-bend bundle gives 5-277-14-078-001 the thermal and mechanical margin expected of Diamondback tank heater equipment in in-tank heating with boiler water in the tubes and cross-contamination protection. The vented air gap between tube walls gives a visible telltale leak rather than allowing boiler water and tank contents to mix. Physically, the unit runs a 14-inch shell, 78-inch shell length in a 2-pass arrangement. It carries 3/4-inch O.D. tubes. The build specifies cast iron bonnets, steel shell, and copper (double wall) tubes. On the ratings side, expect 150 PSI on the shell side, 125 PSI on the tube side, and 375°F maximum temperature. Typical duty includes potable water storage tanks, institutional and health care water storage, and domestic water storage under double-wall codes.