• Three-pass wet back design eliminates refractory baffles between flue gas passes.
• Minimum maintenance with rugged construction for extra-long life.
• U.L. listed boiler/burner package for firing gas, oil and combination gas/oil.
• Factory tested and checked for optimum operating efficiency.

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Durability
Built in accordance with the ASME Code, the wet back design has proven to give much longer useful life cycles than dry back boilers.

Quality
Each unit is tested and inspected, and is registered with the National Board of Boiler and Pressure Vessel Inspectors.

Design
Hurst Boiler utilizes state of the art computer design techniques in every boiler. This accounts for accurate calculations of construction materials and optimum utilization of the boiler's performance criteria.

Efficiency
The Series 400 is designed for optimum fuel efficiency and has proven in certified tests to meet and often exceed the efficiencies of 4-pass boilers.

Low Maintenance
There is no refractory rear door, to maintain and no refractory baffles to replace. Elimination of these components results in thousands of dollars of savings.

Tube Sheets
The wet back has independent tube sheets with uniform temperatures. Three and four pass dry back boilers have tube sheets with large temperature variations and this results in premature tube failure and cracks in the tube sheets.

Easy Access
Since there is no large refractory rear door, one man can easily remove the rear cover plates for access to the tubes. Front doors can be opened without removing burner components or controls.

Compact
With computer aided design, Hurst has made the wet back a space saving workhorse without sacrificing the principle of 5 sq. ft. of heating surface per BHP.

Combustion
Hurst uses name brand burner components with proven reliability. Every unit is boiler/burner compatible and tested at the factory prior to shipment.

Standard Steam Trim

• Operating & high limit pressure control
• Water column with gauge glass combination low water cut-off & pump control
• Probe type auxiliary low water cut-off with manual rest
• Water column drain valve
• Safety relief valve(s)) per ASME Code
• Steam Gauge
• Stack Thermometer

Standard Water Trim

• Operating & high limit temperature control
• Low water cut-off control with manual reset
• Combination pressure, temperature gauge
• Hot water return baffle for shock resistance
• Safety relief valve(s)) per ASME Code
• Stack thermometer

WET BACK ADVANTAGE

Dry backs are subject to deteriorating rear refractory, leaking baffles, leaking door seals, and often found with a heat-stressed rear tubesheet. Fragile refractory baffling and door seals will require continuous monitoring, maintenance, and replacement, costing thousands of dollars in materials and specialized labor cost over the life of the boiler. In addition, broken baffles and leaking seals will short-circuit boiler efficiency up until repairs can be made, and downtime during repairs can bring your production process to a halt.

All of those frustrating problems have been designed out of the Hurst Series 400 Wetback. It has a full wet back radiant heat transfer area that promotes superior internal water circulation and rapid heat absorption. Separate rear tubesheets allow each pass of tubes to expand and contract at its own rate without tube-to-sheet stress. Tubes are mechanically rolled, flared and beaded, making any tube service a simple matter. The only rear refractory is a 18 inch plug which allows access to the furnace for inspection.