{"id":775,"date":"2026-10-07T22:18:49","date_gmt":"2026-10-07T22:18:49","guid":{"rendered":"https:\/\/staginglab.us\/clarkwf\/?post_type=boiler&p=775"},"modified":"2026-10-07T22:18:49","modified_gmt":"2026-10-07T22:18:49","slug":"hurst-400-series-boiler","status":"publish","type":"boiler","link":"https:\/\/staginglab.us\/clarkwf\/boiler\/hurst-boilers\/scotch-marine\/hurst-400-series-boiler\/","title":{"rendered":"Hurst 400 Series Boiler"},"content":{"rendered":"

THREE-PASS SCOTCH MARINE DESIGN<\/span><\/h1>\n
\n
\n

LOW PROFILE, WET BACK CONSTRUCTION<\/p>\n

Available in 8 Models from 100 – 2000 BHP<\/strong><\/i>\u00a0<\/strong><\/p>\n

Steam Pressures to 15-300 PSI<\/strong><\/i>\u00a0<\/strong><\/p>\n

Hot Water Section I and Section IV<\/strong><\/i>\u00a0<\/strong><\/p>\n

Wetback design eliminates refractory rear door & baffles between flue gas passes<\/p>\n

    \n
  • Natural Gas<\/li>\n
  • Oil<\/li>\n
  • Combination<\/li>\n
  • Steam<\/li>\n
  • Hot Water<\/li>\n<\/ul>\n

    Standard Features<\/h3>\n
      \n
    • Boiler is of the three-pass, scotch type, built and stamped in accordance with the requirements of the ASME Code, and listed by the National Board of Boilers and Pressure Vessel Inspectors.<\/li>\n
    • Large combustion chamber with low heat release for complete combustion. Smoke box is rear-mounted with slip-on stack connector.<\/li>\n
    • Access to fireside is accomplished with hinged and davited front and rear doors. Flame observation ports are located on front and rear.<\/li>\n
    • Openings for vessel cleanout and inspection of waterside are provided with 3″ x 4″ hand holes, and 12″ x 16″ manway access.<\/li>\n
    • Insulated with 2″ high density mineral wool, lagged with 22 gauge grip jacketing, baked on finish to resist chipping and fading.<\/li>\n
    • Firetubes are rolled and beaded on power boilers, expanded and flared on low pressure boilers.<\/li>\n
    • Supports include lifting lugs securely welded to the top of shell; structural steel support legs on skids support the boiler so that special foundations are not required.<\/li>\n<\/ul>\n

      Standard Steam Trim<\/h3>\n
        \n
      • Operating & high limit pressure control<\/li>\n
      • Modulating pressure control (when applicable)<\/li>\n
      • Water column with gauge glass, combination low water cut-off & pump control<\/li>\n
      • Probe Aux, L.W.C.O. Steam pressure gauge, syphon & test cock<\/li>\n
      • Water column drain valve<\/li>\n
      • Safety relief valve(s) per ASME Code<\/li>\n<\/ul>\n

        Standard Water Trim<\/h3>\n
          \n
        • Operating & high limit temperature control<\/li>\n
        • Modulating temperature control (when applicable)<\/li>\n
        • Probe type low water cut-off control<\/li>\n
        • Combination pressure & temperature gauge<\/li>\n
        • Hot water return baffle for shock resistance<\/li>\n
        • Safety relief valve(s) per ASME Code<\/li>\n<\/ul>\n

          Boiler Design<\/h3>\n

          Three-Pass “Scotch Marine” Firetube design with stress relieving “Wetback” construction. Pressure designs for steam are 15-300 psi. 100-600 hp. 250 psi. max. for 700-1500 hp. and 200 psi. max. for 1800-2000 hp. Hot Water pressures models are from 30-160 psi. High pressure, high temperature Section I hot water boilers available. Factory assembled with trim, tested, ASME code, UL, and CSD-1 standards.<\/p>\n

          Steam Model Trim<\/h3>\n

          Safety relief valve, operating pressure control, high limit pressure control with manual reset, steam pressure gauge with syphon, combination pump control and low water cut-off with gauge glass assembly and drain valve, auxiliary low water cut-off with manual reset.<\/p>\n

          Hot Water Model Trim<\/h3>\n

          Safety relief valve, operating temperature control, high limit temperature control with manual reset, combination pressure & temperature gauge, low water cut-off control with manual reset. BURNER: Matched UL listed “forced draft” power burners with factory prepiped, wired and tested fuel configurations for natural gas, propane (LP) gas, No. 2 (diesel) oil, or combination of both gas\/oil.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

          THREE-PASS SCOTCH MARINE DESIGN LOW PROFILE, WET BACK CONSTRUCTION Available in 8 Models from 100 – 2000 BHP\u00a0 Steam Pressures to 15-300 PSI\u00a0 Hot Water Section I and Section IV\u00a0 Wetback design eliminates refractory rear door & baffles between flue gas passes Natural Gas Oil Combination Steam Hot Water Standard Features Boiler is of the […]<\/p>\n","protected":false},"featured_media":776,"parent":758,"menu_order":0,"template":"","meta":{"_acf_changed":false},"categories":[],"page-type":[],"class_list":["post-775","boiler","type-boiler","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/staginglab.us\/clarkwf\/wp-json\/wp\/v2\/boiler\/775","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/staginglab.us\/clarkwf\/wp-json\/wp\/v2\/boiler"}],"about":[{"href":"https:\/\/staginglab.us\/clarkwf\/wp-json\/wp\/v2\/types\/boiler"}],"up":[{"embeddable":true,"href":"https:\/\/staginglab.us\/clarkwf\/wp-json\/wp\/v2\/boiler\/758"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staginglab.us\/clarkwf\/wp-json\/wp\/v2\/media\/776"}],"wp:attachment":[{"href":"https:\/\/staginglab.us\/clarkwf\/wp-json\/wp\/v2\/media?parent=775"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/staginglab.us\/clarkwf\/wp-json\/wp\/v2\/categories?post=775"},{"taxonomy":"page-type","embeddable":true,"href":"https:\/\/staginglab.us\/clarkwf\/wp-json\/wp\/v2\/page-type?post=775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}