Series 400

The Hurst 400 Series three-pass wetback scotch marine boiler is an ideal choice for all commercial and industrial applications when engineering mechanical systems using the latest HVACR technologies. The Hurst 400 Series Boiler provides fuel efficiencies that exceed most  four-pass designs. Having no large refractory rear door, these boilers allow one technician easy access to all tubes. The boilers' front doors can be opened without removing any burner components or controls.

Capacities range from 15 to 2,000 HP and 1004 to 50213 MBTU/HR. Available for 15 PSI Steam and 30 PSI Water (60 PSI Water Optional).

• Factory assembled, prewired and tested
• No field assembly required
• UL listed boiler/burner packages
• Fully assembled, prepiped, prewired, pressure tested gas trains
• Complies with ASME, UL, CSD-1 and ASHRAE standards
• High efficiency, low stack temperatures
• Customer service support through national network of sales, service, start-up, training and parts by factory representatives

Wetback Advantage

Dry backs boilers are subject to deteriorating rear refractory, leaking baffles, leaking door seals, and often found with a heat-stressed rear tube sheet. Fragile refractory baffling and door seals will require continuous monitoring, maintenance, and replacement, costing thousands of dollars in materials and specialized labor costs over the life of the boiler. In addition, broken baffles and leaking seals will short-circuit the boiler’s gas flow, causing high stack temperatures and lowering efficiency until repairs can be made.

This can bring your production process to a costly halt. All of those frustrating problems have been designed out of the Hurst Series 400 Wet back. It has a full wet back radiant heat transfer area that promotes superior internal water circulation and rapid heat absorption. Separate rear tube sheets 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 manway plug which allows access to the furnace for inspection

Standard Features

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 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 four-pass boilers.

Low Maintenance
There are no refractory baffles to replace or maintain. Elimination of these will result in thousands of dollars in 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 &limit pressure control
• Modulating pressure control (when appl.)
• Water column with gauge glass probe typecombination low water cut-off & pump control (not shown)
• Probe type auxiliary low water cut-off with manual reset
• Water column drain valve
• Safety relief valve(s) per ASME Code steam gauge
• Stack thermometer

Standard Water Trim

• Operating & limit temperature control
• Modulating temperature control (when appl.)
• 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

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