Steam Boilers

Steam Boilers

Precision steam boilers provide high quality steam, when you need it, where you need it, every time you need it. Whether the application requires high-pressure process grade steam, low-pressure hydronic steam for comfort heating, or ‘clean’ steam for humidification or sterilization, Precision will deliver a reliable and efficient solution that system engineers and facility owners will appreciate. Our steam boilers are manufactured to stringent industry standards and designed to fit a wide range of applications. They are available in both electric (ST and STH series) and fuel-fired (FPS and FTS series) boiler designs that can be customized to comply with most any specification. Our unique skid packaged steam systems are custom designed, fabricated and factory-tested by Precision to minimize field installation time and expenses. Our steam boilers are commonly used for space heating, sterilization, humidification and process steam.

HVAC/R | Central Steam Plant | Health Care | Industrial Process | Power Generation

ST Steam Boiler

Capacities: 100 PPH to 10,000 PPH (10 BHP to 300 BHP) @ 99.5% efficiency
Standard Model: ASME Section IV “H” Stamp (< 15 PSI) or Section I “S” Stamp (> 15psi)
Compliances: UL Subject 834, NEC/NFPA Article 424-G, ASME Safety Code CSD-1

Despite its compact footprint, the Model ST’s large steam chest delivers high quality, dry steam with minimum carryover. Fuel-oil or propane boiler retrofits are simpler with a Precision Model ST that requires no vent stack or combustion air louvers and can be supplied in a ‘knock-down’ condition to fit through narrow entries to the old boiler room. The standard ST models can be customized with a variety of factory installed options or configured to connect with field mounted interfaces, giving you exceptional flexibility in design and specification. Adding an SCR creates a boiler with 100:1 turndown to precisely follow the process demand.

  • Custom models can be supplied in a ‘knock-down’ condition to fit through narrow entries
  • Each heating element is fitted with its own 2-1/2” square mounting flange, individually installed in either one or both head(s) of the vessel to simplify maintenance and reduce downtime
  • Step Circuit Enable/Disable switches make it easy to limit boiler’s maximum firing rate when other higher priority electric loads are peaking
  • Optional SCR control provides near infinite modulation to precisely follow heating load while minimizing energy usage
  • Requires no vent stack, breeching, or combustion air louvers—reducing total installation costs and speeding up completion

O&M Manual | Spec Material

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FPS Vertical Firetube Steam Boiler

Capacities: 330 PPH to 3,440 PPH (9.5 BHP to 100 BHP) @ up to 83% efficiency
Standard Model: ASME Section IV “H” Stamp (15 PSI) or Section I “S” Stamp (150 PSI)
Compliances: UL Subject 795/726/2096, ASME Safety Code CSD-1

Traditional vertically configured fire-tube design with better over-all efficiency due to a bottom-fired power burner. In addition to the simplicity of the 4-piece design, the FPS includes many advantages over other vertically configured boilers, including: large water volume and steam chest that reduces cycling, and an internal feedwater pre-heater to improve overall efficiency and reduce the risk of thermal shock.

  • Better overall efficiency than other vertical boilers
  • Single Pass heat transfer area sized at 4 sq. ft. per BHP provides maximum
    heat transfer
  • Simple 4-piece design (combustion chamber, pressure vessel, combustion gas collector with flue, and cabinet) can be supplied in a ‘knock-down’ condition to fit where access is limited

 O&M Manual | Spec Material

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FTS Flexible Water Tube Steam Boiler

Capacities: 863 PPH to 17,255 PPH (25 BHP to 500 BHP) up to 85% efficiency
Standard Model: ASME Section IV “H” Stamp (15 PSI) or Section I “S” Stamp (150 PSI)
Compliances: UL Subject 795/726/2096, ASME Safety Code CSD-1

Flex-tube forced draft design offers high fuel-to-output efficiency in a compact, maintenance-friendly design that harnesses natural heat convection to ensure consistent internal heat distribution and complete internal feedwater circulation. The upper steaming chamber is connected to the lower feedwater return vessel via individual serpentine configured carbon steel tubes, to form a 5-pass heat transfer area of 5 sq. ft. per BHP. Separate down-comers connect the upper and lower vessels outside the boiler cabinet to optimize natural circulation and heat transfer.

  • Individual carbon steel tubes bent into a serpentine configuration connect the lower return water vessel to the upper water-to-steam separation vessel to
    form a 5-pass heat transfer space providing a minimum 5 sq. ft. of heating surface per BHP
  • Separate down-comers connect the upper and lower vessels outside the boiler cabinet to optimize natural internal convection and water circulation through the heating tubes,
    resulting in a pressure vessel that generates steam rapidly without the risk of thermal shock
  • FTS-1/2/3 series are configured with tangent water walls on 3 sides of the combustion chamber, requiring tube removal clearance on only one side of the boiler
  • FTS-4/5/6 series are configured with tangent water walls on 4 sides of the combustion chamber, requiring tube removal clearance on both sides of the boiler
  • All models can be supplied in a ‘knock-down’ condition to fit where access is limited, then reassembled with NO on-site code welding required

O&M Manual | Spec Material

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Skid Packaged Steam Systems

Capacities: varies, as customized
Standard Model: ASME Section varies, as customized

Skid Packaged Steam BoilersThe most customized solution available, our ‘boiler room on a skid’. This complete steam generating system is custom designed by Precision’s engineering team: pre-piped and pre-wired with controls on a common base, fully functioning and factory tested. The skid packaged steam system simplifies procurement with one-source equipment purchasing, saves time and increases efficiency by reducing uncertainty and potential delays. With Precision skid packs on the job, there’s no need to hire a third-party engineer, coordinate multiple vendor production schedules, or schedule multiple deliveries, with the associated crane rental costs.

  • Complete steam generating system custom designed by Precision’s engineering team, pre-piped, pre-wired with controls, on a common base that is functionally tested at the factory to provide a fully functioning ‘boiler room on a skid’
  • Only four main terminal connections when installed on-site: one make-up water supply, one main
    electrical supply, one drain, one steam supply; if fossil-fuel fired: add gas supply, combustion air supply, and exhaust flue
  • Combining multiple equipment purchases with one source simplifies procurement
  • No need to hire a third party engineer, coordinate multiple vendor production schedules, or schedule multiple deliveries—and the associated crane rental costs—to the job site
  • Reduces uncertainty and potential delays connecting and configuring controls at the job site
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STH High Pressure Steam Boiler

Capacities: 100 PPH to 10,000 PPH (10 BHP to 300 BHP) @ 99.5% efficiency
Standard Model: ASME Section I “S” Stamp (>15 PSI)
Compliances: UL Subject 834, NEC/NFPA Article 424-G, ASME Safety Code CSD-1

STH Electric Steam BoilerWhen specification calls for higher pressure process steam (> 200 psi operating), the STH delivers high quality process steam in a compact footprint. Custom models can be supplied in a ‘knock-down’ option to fit narrow entries. Optional SCR control provides near infinite modulation to precisely follow heating load. Requires no vent stack, breeching, or combustion air louvers. The STH is perfect for high pressure process steam installations, and saves time and money, with no need for custom ventilation.

  • Custom models can be supplied in a ‘knock-down’ condition to fit through narrow entries
  • Step Circuit Enable/Disable switches make it easy to limit boiler’s maximum firing rate when other higher priority electric loads are peaking
  • Optional SCR control provides near infinite modulation to precisely follow heating load while minimizing energy usage
  • Requires no vent stack, breeching, or combustion air louvers—reducing total installation costs and speeding up completion
  • Commonly used for high pressure process steam

O&M Manual

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