Scotch Marine Firetube Boilers
The Scotch Marine Boiler is a fire-tube boiler, in that hot flue gases pass through tubes set within a tank of water. The general layout is that of a horizontal cylinder. One or more large cylindrical furnaces are in the lower part of the boiler shell. Above this is a large number of small-diameter fire-tubes. Gases and smoke from the furnace pass to the back of the boiler, then return through the small tubes and up and out of the exhaust outlet.
SUPERIOR BOILER – There are two basic designs for Scotch Marine Boilers. The typical design is the “wetback”, where the rear face of the combustion chamber is water-jacketed as a heating surface. The “dryback” variation has the rear of the combustion chamber as an open box, backed or surrounded only by a sheetmetal jacket. This simplifies construction but also loses much efficiency. Superior offers 2-pass, 3-pass, and 4-pass firetube designs.
2-Pass Dryback Firetube Boiler
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- Pressures from 15-300 psi steam and 30-160 psi hot water
- Sizes from 40-2,500 BoHP
- Corrugated furnaces on ASME Section I high pressure boilers
- Design pressure capability to 650 psig
- Large furnace volume for complete combustion
- Roller-bearing supported single-hinged rear door for total fireside access
- Large single furnace dryback design with exceptional efficiencies and economical operation
- Packaged with Gas, Oil, or Combination Gas & Oil Burner
2-Pass Dryback Firetube Boiler
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- Pressures from 15-300 psi steam and 30-160 psi hot water
- Sizes from 100-2,500 BoHP
- Corrugated furnaces on ASME Section I high pressure boilers
- Design Pressure Capability to 650 psig on some models
- Large furnace volume for complete combustion
- Lower emissions and high efficiency
- Exceptional efficiencies and economical operation
- Packaged with Gas, Oil, or Combination Gas & Oil Burner
3-Pass Dryback Firetube Boiler
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- Pressures from 15-300 psi steam and 30-160 psi hot water
- Sizes from 30-1,000 BoHP
- Corrugated furnaces on ASME Section I high pressure boilers
- Large furnace and rear turnaround volume for complete combustion
- Roller-bearing supported single-hinged rear door for total fireside access
- Large single furnace dryback design with exceptional efficiencies and economical operation
- Packaged with Gas, Oil, or Combination Gas & Oil Burner
3-Pass Wetback Firetube Boiler
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- Pressures from 15-300 psi steam and 30-160 psi hot water
- Sizes from 70-2,500 BoHP
- Corrugated furnaces on ASME Section I high-pressure boilers
- Large furnace and rear turnaround volume for complete combustion
- Packaged with Gas, Oil, or Combination Gas & Oil Burner
3-Pass Wetback Firetube Boiler
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- Pressures from 15-300 psi steam and 30-160 psi hot water
- Sizes from 70-2,500 BoHP
- Corrugated furnaces on ASME Section I high-pressure boilers
- Large furnace and rear turnaround volume for complete combustion
- Packaged with Gas, Oil, or Combination Gas & Oil Burner
4-Pass Wetback Firetube Boiler
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- Exceptional efficiencies and economical operation
- Pressures from 15-300 psi steam and 30-160 psi hot water
- Sizes from 70-2,500 BoHP
- Corrugated furnaces on ASME Section I high pressure boilers
- Large furnace and rear turnaround volume for complete combustion
- Extended warranty on major PV parts and front/rear smoke box doors
- Packaged with Gas, Oil, or Combination Gas & Oil Burner
2 or 3-Pass Wetback Firetube Boiler
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- All sizes have <360 sq. ft. of ASME heating surface
- Options for 2-Pass dryback, 3-Pass dryback, or 3-Pass wetback design
- Pressures from 15-300 psi steam and 30-160 psi hot water
- Sizes from 80-225 BoHP
- Corrugated furnaces on ASME Section I high-pressure boilers
- Large furnace volume for complete combustion
- Roller-bearing supported single-hinged rear door for total fireside access on dryback models
- Packaged with Gas, Oil, or Combination Gas & Oil Burner