1965 Orr & Sembower 350 HP 3‑pass firetube natural‑gas boiler

Specs Year: 1965 Make: Orr & Sembower Model: 3HG Boiler Type: Firetube (three‑pass design, packaged) Power: 350 HP Capacity: 11,716,250 BTU/hr Max Working Pressure: 15 psi Heating Surface: 1,750 sq ft Gas Consumption Rate: 13,825 cu ft/hr Voltage – Motors: 208 V, 3‑phase Voltage – Controls: 120 V, 1‑phase

All specifications are assumed to be correct but must be confirmed by the purchasing entity.,Installed Options Natural gas burner assembly Electric motor drive system Inline pressure regulators and gas control valves Low-pressure gauge package Exhaust stack lift frame

All specifications are assumed to be correct but must be confirmed by the purchasing entity.,Feature Spotlight • Classic three‑pass design for consistent combustion efficiency • 350 HP capacity ideal for medium industrial steam applications • Rugged build with service access front and rear • 1,750 sq ft heating surface delivers high output steam delivery • Utility-ready natural gas input with inline isolation valves

All specifications are assumed to be correct but must be confirmed by the purchasing entity.,Machine Overview This is a 1965 Orr & Sembower 3HG packaged firetube boiler rated at 350 HP and configured for natural gas operation. Its three-pass firetube layout and 11.7 MMBTU/hr burner firing rate make it well suited for steady-state steam production. The boiler has a 15 psi design pressure, 1,750 sq ft of heating surface, and is powered via a 208 V, 3-phase motor with 120 V, 1-phase controls. The unit appears intact and piped for inline service with valve redundancy and stack suspension in place.

All specifications are assumed to be correct but must be confirmed by the purchasing entity.