5-277-04-024-001

A double-wall two-pass U-bend bundle gives this configuration 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 4-inch shell in a 2-pass arrangement. It carries 3/4-inch O.D. tubes. That combination is cataloged as 5-277-04-024-001. Material selection covers cast iron bonnets, steel shell, and copper (double wall) tubes. On the ratings side, expect 150 PSI on the shell side, 150 PSI on the tube side, and 375°F maximum temperature. Typical duty includes glycol-fed storage heating, potable water storage tanks, and domestic water storage under double-wall codes.