Hurst Boiler - Scotch Marine Boilers
Series 200 Boilers
Scotch Marine Boilers
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Available in Steam or Hot Water Versions | 15 – 800 HP Pressures to 300 psig
- Two-pass design eliminates refractory baffles between flue gas passes.
- Minimum maintenance with rugged construction for extra-long life.
Standard Features
- Boiler is of the two-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.
- Large combustion chamber with low heat release for complete combustion.
- Smoke box is front-mounted with slip-on stack connector.
- Access to fireside is accomplished with hinged and davited rear door (40 HP & larger) and with split front doors. Flame observation ports are on front and rear.
- Openings for cleanout inspection of waterside are provided with 3″ x 4″ hand holes, and with 12″ x 16″ manholes (80 HP up).
- Insulated with 2″ high-density mineralwool, lagged with 22 gauge grip jacketing, baked on epoxy enamel to resist chipping and fading.
- Firetubes are rolled and beaded on power boilers, expanded and flared on low pressure boilers (2″ dia. through 30 HP, 2 1/2″ dia. 40 HP and up).
- 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.
Standard Steam Trim
- Operating & limit pressure control
- Modulating pressure control (when appl.)
- Water column with gauge glass, M-M 157 combination low water cut-off & pump control
- Probe Aux, L.W.C.O.
- Steam pressure gauge, syphon & test cock
- Water column drain valve
- Safety relief valve(s) per ASME Code
Standard Water Trim
- Operating & limit temperature control
- Modulating temperature control (when appl.)
- Probe type low water cut-off control
- Combination pressure, temperature, altitude gauge
- Hot water return baffle for shock resistance
- Safety relief valve(s) per ASME Code
Series 250 Boilers
Scotch Marine Boilers
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Introducing the New Hurst Series 250 Boiler
The all new Hurst 250 Series Boiler has been designed and developed specifically for the International Market, and engineered to fit easily in a 40 ft shipping container. The advanced computer modeled design enables Hurst to provide a full wet-back scotch marine boiler with a larger furnace, and a lesser amount of technically enhanced tubes.
The improved two-pass design that eliminates refractory baffles between flue gas passes, offers performance equal to 3 and 4 pass boilers in many cases. This improves the efficiency of the boiler by up to 2%, as well as providing lower NOx levels. Additionally, shipping costs can be reduced as much as 2-10x previous cost, saving thousands of dollars.
Standard Features
- Boiler is of the two-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.
- Large combustion chamber with low heat release for complete combustion.
- Smoke box is front-mounted with slip-on stack connector.
- Access to fireside is accomplished with davited rear door and with split front doors. Flame observation ports are on front and rear.
- Openings for cleanout inspection of waterside are provided with 3″ x 4″ hand holes, and with 12″ x 16″ manholes (80 HP up).
- Insulated with 2″ high-density mineral wool, lagged with 22 gauge grip jacketing, baked on epoxy enamel to resist chipping and fading.
- Fire tubes are rolled and beaded on power boilers, expanded and flared on low pressure boilers (2″ dia. through 30 HP, 2 1/2″ dia. 40 HP and up).
- 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.
Standard Steam Trim
- Operating & limit pressure control
- Modulating pressure control (when applicable)
- Water column with gauge glass, M-M 157 combination low water cut-off & pump control
- Probe Aux, L.W.C.O.
- Steam pressure gauge, syphon & test cock
- Water column drain valve
- Safety relief valve(s) per ASME Code
Standard Water Trim
- Operating & limit temperature control
- Modulating temperature control (when applicable)
- Probe type low water cut-off control
- Combination pressure, temperature and altitude gauge
- Hot water return baffle for shock resistance
- Safety relief valve(s) per ASME Code
Series 250w Boilers
Scotch Marine Boilers
For More Information:
Introducing the New Hurst Series 250W Boiler
The 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 250W Wet back. It has a full wet back radiant heat transfer area that promotes superior internal water circulation and rapid heat absorption. The 250W’s 2-pass design allows the fire tubes to expand and contract at its own rate without tube-to-sheet stress. All fire tubes are mechanically rolled, flared and beaded, making any tube service a simple matter. The only rear refractory in this design is a manway plug which allows access to the furnace for service and annual inspection.
The Hurst 250 Series Boilers have been designed and developed specifically for the International Market, and engineered to fit easily in a 40-ft shipping container. The advanced design enables Hurst to provide a full wet-back scotch marine boiler with a larger furnace, and a lesser amount of technically enhanced tubes.
Standard Steam Trim
- Operating & high limit pressure control.
- Modulating pressure control.
- Water column with gauge glass, combination low water cut-off & pump control.
- Probe Aux, L.W.C.O. w/ Manual Reset.
- Steam pressure gauge, syphon & test cock.
- Stack Thermometer, Water column drain valve.
- Safety relief valve(s) per ASME Code.
Standard Water Trim
- Operating & high limit temperature control.
- Modulating temperature control.
- Probe type low water cut-off control w/ Manual Reset.
- Combination pressure & temperature gauge.
- Hot water return baffle for shock resistance.
- Safety relief valve(s) per ASME Code.
- Stack Thermometer.
Series 300 Boilers
Scotch Marine Boilers
For More Information:
Available in Steam or Hot Water Versions 15 – 800 Bhp Pressures to 300 psig
- Three-pass design
- 81% minimum efficiency
- Davited rear doors
- Low maintenance
- 5 sq. ft. heating surface/HP
- Durable design
- Heavily constructed
Standard Features
- Boiler is of three pass dry back, 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.
- Large combustion chamber with low heat release for complete combustion.
- Rear smoke box includes slip-on stack connector and features hinged and davited rear door (all sizes) with 16″ dia. access door with 2″ observation port (80 Hp & larger).
- Front doors are hinged, bolted and insulated (80 Hp & larger) to provide ready access to all firetubes.
- Large 12″ x 16″ manholes are standard on larger units (40 Hp & up). Cleanout hand holes 3″ x 4″ are furnished in the bottom of the boiler shell.
- Insulated with 2″ high-density fiberglass, the shell is covered with 22 gauge grip jacketing and spray baked on powder coat finish.
- 2 1/2″ dia. steel firetubes (2″ dia. through 30 Hp) are rolled and beaded on power boilers, expanded and flared on low pressure boilers.
- Twin lifting lugs are securely welded to the top of the shell. Heavy steel support legs on skids provide support for the boiler & burner.
Standard Steam Trim
- Operating & high limit pressure control
- Modulating pressure control on modulating burners
- Water column with gauge glass, trycocks. Combination low water cut-off and pump controller
- Probe Aux, L.W.C.O.
- Steam pressure gauge with syphon and test cock
- Stack Thermometer
- Water column drain valve
- Safety relief valve(s) per ASME code
Standard Water Trim
- Operating & high limit temperature control
- Modulating control on boilers with modulating burners
- Probe type low water cut-off control
- Combination pressure, altitude, temperature gauge
- Stack thermometer
- Hot water return baffle for thermal shock resistance
- Safety relief valve(s) per ASME code
Series 400 Boilers
Scotch Marine Boilers
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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 boiler’s front doors can be opened without removing any burner components or controls.
Capacities range from 15 to 2,000 HP and 1,004 to 50,213 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.
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 boiler 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 applicable)
- 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 applicable)
- 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
Series 500 Boilers
Scotch Marine Boilers
For More Information:
The Hurst 500 Series four-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 500 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 boiler front doors can be opened without removing any burner components or controls.
- 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
Dryback 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 500 Wetback. It has a full wetback 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 500 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 and high limit pressure control
- Modulating pressure control (when appl.)
- Water column with gauge glass, combination low water cut-off and pump control
- Probe Aux, L.W.C.O. with Manual Reset
- Steam pressure gauge, syphon and test cock
- Stack Thermometer, Water column drain valve
- Safety relief valve(s) per ASME Code
Standard Water Trim
- Operating and high limit temperature control
- Modulating temperature control (when appl.)
- Probe type low water cut-off control with Manual Reset
- Combination pressure and temperature gauge
- Hot water return baffle for shock resistance
- Safety relief valve(s) per ASME Code
- Stack Thermometer
Series LPE Boilers
Scotch Marine Boilers
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Boiler
Three pass, compact fire-tube design for 15 psi steam or 30 psi water Section I and Section IV (optionally available for 60 psi water). Factory assembled with trim, tested, ASME code, UL, and CSD-1 standards.
Steam Trim
Safety relief valve, operating pressure control, high limit pressure control with manual reset, steam pressure gauge with syphon and test cock, combination pump control and low water cut-off with gauge glass assembly and drain valve, auxiliary low water cut-off with manual reset.
Water Boiler Trim
Safety relief valve, operating temperature control, high limit temperature control with manual reset, 3 1/2″ combination pressure and temperature gauge, M&M 750 low water cutoff control with manual reset.
Burner
UL listed with pre-piped, wired and factory tested forced draft power burners for:
- Natural Gas
- Propane (LP) Gas
- No. 2 (Diesel) Oil
- Combination Gas/Oil
Hurst “Performance” Boiler
- Factory Assembled, Pre-wired and Tested
- No Field Assembly Required.
- UL Listed Boiler/Burner Packages.
- Fully Assembled, Pre-piped, Pre-wired, 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, St Training and Parts by Factory Representatives.
LPE Boiler Features
- Welded steel fire tube boiler, the LPE has extra-heavy 13-gauge tubes for extended life. All tubes are sealed to the tube sheets by rolling and flaring.
- There are no welded tubes in the LPE.
- Thickest materials used in the industry… Boiler shell is 5/16″ thick boiler plate 20-40 HP / 3/8″ 50-100 HP.
- Twin boiler tube sheets are 1/2″ thick boiler plate.
- Insulation is 2″ mineral wool and is lagged with 22-gauge boiler jacket.
- Extra heavy 4″ channel iron boiler skids.
Designed to last with special industrial grade features
- Couplings are 3,000 psi.
- Flanged, detachable front and rear smoke boxes.
- Brass nuts on access panels, brass plugs installed in inspection crosses and tees on water and steam piping trim.
Series LPW Boilers
Scotch Marine Boilers
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Hot Water Applications
- Specifiable using the attributes of the LPE design.
- Remains classified as a modified scotch, firetube type boiler.
- Efficiencies tested at >83% on natural gas.
- Smaller foot print, can be installed in tighter places.
- Semi wet-back construction.
Standard Equipment
Boiler
Three pass design for 30 psi hot water (available for 60 psi water). Factory assembled with trim and, tested in accordance with ASME code, UL, and CSD-1 codes. Steel turbulators inserted in third pass for maximum heat transfer control.
Standard Boiler Trim
Kunkle safety relief valve, operating temperature control, high limit temperature control with manual reset, 3 1/2″ combination pressure & temperature gauge, M&M 750 low water cut-off control with manual reset.
Burner
UL listed with pre-piped, wired and factory tested forced draft power burners for:
- Natural Gas
- Propane (LP) Gas
- No. 2 (Diesel) Oil
- Combination Gas/Oil
Hurst “Performance” Boiler
- Factory Assembled, Prewired and Tested
- No Field Assembly Required.
- UL Listed Boiler/Burner Packages.
- Fully Assembled, Pre-piped, 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, St Training and Parts by Factory Representatives.
LPW Boiler Features
Modified Scotch designed to fit through a standard 36″ x 80″ door opening Up to 125 HP (4,184 mbh output).
The Hurst LPW “Performance” boiler is America’s most heavily designed and built boiler in its class. Consider the features and specify the Hurst LPW Series.
- A welded steel firetube boiler, the LPW has extra-heavy 13-gauge tubes for extended life. All tubes are attached to the tube sheets by rolling and flaring. There are no welded tubes in the LPW.
- Thickest materials used in the industry.
- Boiler shell is 5/16″ thick boiler plate 30-40 HP / 3/8″ 50-125 HP.
- Twin boiler tube sheets are 1/2″ thick boiler plate.
- Insulation is 2″ ceramic wool and is lagged with 22-gauge boiler jacket.
- Extra heavy 4″ channel iron boiler skids.
- Designed to last with special industrial grade features.
- Couplings are 3,000 psi.
- Flanged, detachable front and rear smoke boxes.
- Brass nuts on front access panels, brass plugs in factory pre-piped crosses and tees on trim.
Series LPX Boilers
Scotch Marine Boilers
For More Information:
Enhanced Fire Tubes
Heat Transferring Embossed Surface
Mechanically embossed spiral ribs on the inside of the tube not only provides increased surface area, but also leads to a complex gas flow with a boundary layer producing a separation/reattachment phenomenon.
This reattachment action substantially improves heat transfer. With this enhanced tube design, the heat transfer rate is 85% greater than a plain fire tube. Cost savings of up to 20% on the entire boiler package can be obtained with the use of enhanced spiral ribbed tubes.
BOILER DESIGN: Modified: Thru-the-door 2-Pass Scotch Marine Firetube design with stress relieving “HURST Wetback” construction. Pressure designs available for steam and hot water are: 30-125 HP. 15 PSI max. (STEAM) 30-125 HP. 60 PSI max. (HOT WATER)
Section IV
Factory assembled with trim, tested, ASME code, UL, and CSD-1 standards. STEAM MODEL TRIM: 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.
HOT WATER MODEL TRIM: 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.
Dry back 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 LPX Wet back. It has a full wet back radiant heat transfer area that promotes superior internal water circulation and rapid heat absorption, rear tube sheet, and allows tubes to expand and contract at its own rate without tube sheet stress. The only rear refractory is a manway plug which allows access to the furnace for inspection.
Standard Steam Trim
- Operating & high limit pressure control
- Modulating pressure control (when applicable)
- Water column with gauge glass protector and drain valve
- Primary low water cut-off & pump control
- Probe Secondary low water cut-off w/ Manual Reset
- Steam pressure gauge, syphon & test cock
- Safety relief valve(s) per ASME Code
Standard Water Trim
- Operating & high limit temperature control
- Modulating temperature control (when applicable)
- Probe type low water cut-off control w/Manual Reset
- Combination pressure & temperature gauge
- Hot water return baffle for shock resistance
- Safety relief valve(s) per ASME Code
Ohio Special Boilers
Scotch Marine Boilers
For More Information:
Capacities from 100 to 225hp. 347 to 6695 MBTU/HR.
UL Approved Forced Draft Burners
- Efficient 3-Pass Wet Back Design
- Hinged Doors on Front & Rear Smoke Boxes for Easy Service
- ASME Code Constructed & Stamped For Pressures to 300 PSI
- Registered With The National Board of Boiler Inspectors
- Low Furnace Heat Release
- Large Furnace Volume For Ultimate Combustion Efficiency
- Steel Skids and Lifting Eyes
- UL Listed Controls & Trim
- Competitively Priced, Easily Maintained, Designed For Efficiency
- Flame Observation Ports – Front & Rear
- Factory Insulated
- Factory Jacketed & Painted
- Easy Access to Fireside Surfaces
- Ample Water Side Cleanout Openings
- Fully Automatic Operation
- UL Listed, Forced Draft Burners
- Fuel Flexibility – Gas, Oil and Combination Gas/Oil
Standard Features – Ohio Special Series
All units are factory packaged with operating controls, relief valves, burner and fuel train. Installation is made simple in that only service connections are needed to place in operation. Flexible burner systems are available for firing natural gas, LP gas, #2-6 oil or combinations. High density mineral wool insulation assures lower radiant heat loss. In addition to meeting the requirements of UL, burner systems are optionally available to meet the requirements of FM, IRI, CSD-1 and others.
Steam Trim
- Steam pressure gauge with syphon and testcock
- Probe type combination low water cutoff and pump control (or feeder)
- Water column gauge glass set and drain valve
- Probe type Aux. L.W.C.O.
- ASME safety relief valve(s)
- Operating, high limit and modulating pressure controls
Euro Series Boilers
Scotch Marine Boilers
For More Information:
Wetback design eliminates refractory rear door & baffles between flue gas passes
- Natural Gas
- Oil
- Combination
- Steam
- Hot Water
Standard Features
- 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.
- Large combustion chamber with low heat release for complete combustion. Smoke box is rear-mounted with slip-on stack connector.
- Access to fireside is accomplished with hinged and davited front and rear doors. Flame observation ports are located on front and rear.
- Openings for vessel cleanout and inspection of waterside are provided with 3″ x 4″ hand holes, and 12″ x 16″ manway access.
- Insulated with 2″ high density mineral wool, lagged with 22 gauge grip jacketing, baked on finish to resist chipping and fading.
- Firetubes are rolled and beaded on power boilers, expanded and flared on low pressure boilers.
- 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.
Standard Steam Trim
- Operating & high limit pressure control
- Modulating pressure control (when applicable)
- Water column with gauge glass, combination low water cut-off & pump control
- Probe Aux, L.W.C.O. Steam pressure gauge, syphon & test cock
- Water column drain valve
- Safety relief valve(s) per ASME Code
Standard Water Trim
- Operating & high limit temperature control
- Modulating temperature control (when applicable)
- Probe type low water cut-off control
- Combination pressure & temperature gauge
- Hot water return baffle for shock resistance
- Safety relief valve(s) per ASME Code
Boiler Design
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.
Steam Model Trim
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.
Hot Water Model Trim
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.
Counter Flow Series
Scotch Marine Boilers
For More Information:
Hurst Boiler is pleased to announce the patent approval for its revolutionary new counter-flow device designed to improve boiler efficiency.
Available as an option on all Scotch Marine and Euro Series Boilers
Integrated inside of the pressure vessel, Hurst’s optional counter-flow device is factory-built into the company’s innovative Thermal Master Counter-Flow Boiler Series and can be added to any of Hurst’s packaged Scotch Marine and Euro Series boilers, depending on desired efficiency requirements.
Representing a new concept in the design of conventional fire tube steam boilers, Hurst’s new counter-flow device improves boiler efficiency without increasing the heat transfer surface area and flue gas pressure drop through the boiler. Hurst’s advanced technology and engineering works as an economizer and aids to absorb more heat from exhaust gases by utilizing feedwater potential in a unique water-to-flue gas counter-flow design.
Performing the same function as a traditional external economizer typically used with conventional steam generation systems, Hurst’s patented internal counter-flow device captures the lost or waste heat from the hot flue and stack gasses of the boiler. In accordance with patent approval, calculations were performed by computer model of Hurst’s counter-flow boiler under typical conditions. Relative to other boilers having traditional designs, tests determined that the device improves boiler efficiency by as much as 3%, depending on working conditions.
Unlike the bulky assembly of a typical external economizer that has separate housing and ductwork in addition to the boiler housing, Hurst’s streamlined, internal counter-flow device requires no external housing or support. As a result, boiler room costs can also be further reduced by savings associated with installation, maintenance and labor.
Stack Master
Scotch Marine Boilers
For More Information:
The Hurst internal stack economizer is a factory-optional device that is designed to increase the operating efficiency of a boiler, cutting down on its operational costs over the lifetime of the boiler.
Boilers operate by heating water to make steam, and using that steam for heating, processing or power generation. For the most part, a boiler is fairly efficient, but some heat loss may occur when the flu gasses resulting from combustion are vented. The spent gases after combustion are quite hot, often very hot, and when they are simply vented out the exhaust stack, this represents lost heat for the boiler system.
The Hurst stack economizer acts as a waste heat recovery device, ensuring that this available heat does not go unused. Instead, the heat is recovered to essentially preheat the boiler’s makeup water.
Consider this option as a built in feedwater heater; ensuring that the make-up water used to replenish the boiler is pre-heated to near boiling temperatures, so that the boiler does not have to expend as much energy heating it to steam.
Using an economizer does not just prevent heat loss — it can also extend the life of the boiler. Stresses from using cooler temperature make-up water, known as “thermal shock”, can subject wear and tear on the boiler’s structural integrity over time. This shock effect occurs as the boiler’s fixed tube-sheets and fire-tubes rapidly contract from the sudden make-up of cooler temperature water. However, when this water is pre-heated, the temperature differential is far less extreme, putting less strain on the boiler and giving it a longer operating life.
Since even small boiler systems today can be expensive to repair or replace, this innovative design adds to overall savings and protection of the entire boiler system.
Draft Synchronized Control
Scotch Marine Boilers
For More Information:
This device is useful whenever conditions exist whereby draft pressure would otherwise vary greatly or become unstable.
- Factory Installed (Option)
- Retrofit (Existing Boilers) Complete Packages Available
Examples of these potential applications include:
- Two or more boilers tied into a common breeching or stack.
- Unusual stack and breeching layouts. Tall stacks present whereby they can create their own draft.
- Operating environment such as high wind potential or huge swings in temperature.
SEQUENCED DRAFT CONTROL SYSTEM
- Reduce Emissions
- Maximize Your Boiler Efficiency
- Reduce Excess Combustion Air
- Fast Acting, Direct Drive Actuator
- Low Maintenance and User Friendly Monitor, Control and Indicate Stack Pressure Provide Stable Burner Combustion Conditions
Equipment Specifications:
Hurst Boiler’s sequenced draft controls consist of heavy carbon steel dampers, fitted at the boiler’s stack outlet and built into the exiting smoke box assembly. The damper is secured to the outlet using high temperature outboard bearings. The burner is wired such that when there is a call for heat, the motorized damper opens during the pre-purge cycle. Likewise, the damper remains open throughout the post-purge cycle. An adjustable draft sensor device provides a pressure sensing signal to the actuator driving the damper back and forth as is required to maintain the pre-set draft pressure desired. A draft gauge is provided so that the operator can visually see the actual draft pressure as measured. In most cases the desired set pressure range is around .1” to .2” WC.
Ego Series Boilers
Scotch Marine Boilers
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Hurst EGO Series 3-Fuel Boiler. These EGO Series Boilers can be fired with any of three different fuels – gas, oil or via electricity. Designed on the Hurst Euro Series footprint, the EGO Series can produce power either by gas or oil utilizing a burner, and/or by electricity using a configuration of resistive electric elements to achieve desired horsepower totals. Multiple combinations of combustible fuels and electricity and various maximum capacities can be engineered by Hurst to meet specification.
Advantages: The EGO boiler has a significantly smaller footprint and provides more water and steam volume compared to a conventional boiler design. It eliminates downtime on switch-back from electricity to gas operation. This reduces the risk of losing system pressure and maximizes electricity on equal consumption. It can reduce the use of a stationary engineer to close the redundant boiler or switch to electricity-only operation when you have reduced steam consumption. The Hurst EGO Series boiler is factory packaged to include a Stackmaster Economizer to maximize efficiency and reduce greenhouse gas emissions.
- Boilers can be fired with any of three different fuels, gas, oil or via electricity.
- Engineered to work simultaneously or independently on combustion or electricity.
- Multiple combinations of combustible fuels and electricity and various maximum capacities available.
- Smaller footprint with more water and steam volume available.
- Designed for high steam pressure.
- Stackmaster Economizer included to maximize efficiency and reduce greenhouse gas emissions.
Scotch Boiler Series
While our EGO may be designed on Hurst Euro Series footprint. It has the compacity to also be installed on our Series 400 and 500. Our two-pass, three-pass or four-pass Scotch Marine(Fire Tube) boilers are available in dryback, wetback, steam or hot water versions; from 15 to 800 hp with pressures to 300 psig. Hurst Scotch Marine boilers are rated to 81% minimum efficiency.
OXY-MISER SERIES
The use of deaerators has long been used in power plants and water tube-type boilers, primarily because they remove undissolved oxygen and raise the temperature of the feedwater. These advantages are important today for firetube boilers as well, due to higher capital investments. Operating costs can be reduced by recovering flash steam when returned by high-temperature condensate. This feature also raises the feedwater temperature, thus requiring less boiler fuel to convert the feedwater to usable steam. Boiler tubes, condensate lines, and process piping have a much longer useful life by eliminating the pitting action of untreated water. This advantage alone justifies the cost of an “OXY-MISER” deaerator.
Packaged Deaerator Systems, 5,000 to 200,000 PPH.
Conditions feedwater to 0% CO2 and .005cc/liter of oxygen.
INTEGRATED CONTROL SYSTEMS
The Hurst Boiler Firemaster Integrated Control System, an Industrial Internet-of-Things (IIoT) powered solution that delivers next-level boiler innovation and technology. Ideal for any industry, this advanced solution offers users the ability to remotely monitor boiler systems from anywhere, providing alerts and insights as well as actionable controls that help increase reliability, efficiency, safety, and sustainability in the boiler room. Integration of equipment and IT systems and has become essential for efficient operation of facilities of all sizes. Hurst developed and offers a full line of processor-based smart controls fully compatible with all Hurst designs including alternative fuel models, including existing boiler upgrade, and retrofit options for this new technology. Precise control of fuel and combustion air can result in very high efficiencies for boilers. Hurst intelligent control systems allow you to harness these savings while increasing overall boiler plant productivity.
Skid Packages
Scotch Marine Boilers
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urpose designed skid packages incorporate Hurst Performance Series boiler(s) with compatible “Factory Matched” auxiliary equipment minimizing over all footprint and shipping expense. In addition there will be a huge time and cost savings during installation phase.
Our boiler systems are custom designed and engineered for each customer’s specific needs by providing packaged modules that are factory attached to steel skids, pre-piped and wired, all interconnections including:
- Feedwater Tank/Pumps
- Water Softener
- Water Treatment
- Boiler Blowdown
Each package system is compact, easily transported and quickly installed. The system can be supplied from our standard range or specially built to the customers’ requirement. Fully automatic control can be included as well as monitoring devices, feedwater conditioning and all the necessary fittings, pipe work and electrical wiring.
