Series 400

Three-Pass Wetback Scotch Marine Boilers

Three-pass wetback scotch marine boiler. Fuel efficiencies exceed most  four-pass designs.  No large refractory rear door, allows one technician easy access to tubes. Front doors can be opened without removing burner components or controls.

imageCapacities From 15 to 2,000 HP 670 to 3,348 MBTU/HR. 15 PSI Steam 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
  • Modified Scotch designed to fit through a standard 36" x 80" door opening... up to 100HP (3,348 mbh output).

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 Gaug
  • 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

EXPAND Series 400