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  • Unique Points that Differentiate Hydro-Thermal from Competitors

    Hydro-Thermal traces its roots back to 1927, when inventors John White and Roy Miller patented heating equipment using steam to precisely control water temperature. The device was “direct in action,” extended the service life, and used a “valve seat with a sliding closure member”. These components continue to serve as a foundation for Hydro-Thermal technology today. But, there are several other factors that differentiate them from competitors as well:


    • 20 Degreed Engineers, Several PEs on staff
    • 500+ years of DSI knowledge and expertise, installation experience
    • Network of 1,000 representatives, specifying, servicing, improving customer relationships
    • 20,000 heaters installed across 86 countries


    • Recently received more than a dozen awards for manufacturing, operations, innovation, exports
    • Currently hold more than a dozen active patents, registered in multiple foreign countries
    • 4 patents pending on new heater technologies
    • Named in more than 40 process patents
    • Specified in systems developed by leading system integrators, tied to 60+ off-shoot product patents


    • Wide range of product offerings (1”-32”flow), Continuous upgrades and innovations
    • Capable of Producing All Products In House, No Outsourcing
    • Ability to Decrease Lead Times for Heaters and Parts, Patented CTA kept in inventory
    • 4 full-time, knowledgeable, responsive staff provide preventative maintenance to challenging solutions


    • Long term relationships with key technology providers, large customers, research universities
    • Certifications – ISO, PED, UL, ASME, 3A, FDA, CE, EHEDG
    • 4 buildings, 50,000 sq. feet dedicated design and manufacturing space
    • 72% of components sourced locally

    At Campbell-Sevey, one of our core strengths is the superior products we represent back by incredible companies. That's why Hydro-Thermal has been such an important partner. To learn more about Hydro-Thermal's Hydro-Heater or Jet-Cooker products, contact the team at Campbell-Sevey.

  • Understanding Installation of Steam Tracing for Long-Term Application Success

    QMax recently released a detailed whitepaper on how HTC thickness and installation quality affect tracing performance. Here is a short segment along with a link to download the complete whitepaper.

    Qmax steam tracing by Campbell-SeveyOne of the most misunderstood and misused components of conductive steam tracing systems is heat transfer compound, or HTC. HTC is a viscous mastic designed to fill small air gaps between the tracing element and the object to be heated. Heat transfer compound is considerably more effective at transferring heat than static air, but has relatively poor thermal conductivity compared to the other components in a steam tracing system. If used in very thin layers, however, HTC helps maximize the performance of heating systems. This paper discusses and demonstrates why the performance and success of conductive steam tracing systems is highly dependent upon proper installation and use of HTC.

    Around the world, sulfur operations rely heavily on high performance steam tracing and jacketing to heat piping, equipment, and vessels. Failure to properly heat these systems can cause sulfur to freeze and ultimately shut down a processing plant or even an entire refinery. To ensure that a steam tracing system will operate as designed, especially for critical processes like liquid sulfur and vapors with sulfur compounds, proper system installation is critical for long-term success.

    To help understand how HTC thickness and installation quality affect tracing performance in critical operations like those involving sulfur, QMax Industries Inc. focused on testing two high performance steam tracing technologies: FTS (Fluid Tracing System) and CST (Carbon Steel Tracing). The systems were tested extensively with controlled HTC thicknesses for their effectiveness in melting elemental sulfur by tracing a sulfur-filled vessel in a QMax Industries Inc. facility. The outcome of improperly installing HTC, regardless of the reason or steam tracing technology used was consistent: as the HTC layer thickness between the tracing and pipe or vessel increases, the overall heat transfer rate from steam to process decreases. Increasing HTC thickness by only 1/16-inch from an optimal thickness of 1/32-inch increased the time required to melt elemental sulfur by as much as 70%.

    Click to download the complete whitepaper on "Understanding Installation of Steam Tracing for Long-Term Application Success". If you have questions about using steam tracing in your facility, contact the team at Campbell-Sevey.

  • What We Like About the WLC Check Valve

    We sell a lot of valves at Campbell-Sevey, but one that we really like based on how well it is designed is DFT's WLC Sever Service Check Valve. It's design and sizing technology resolves issues with water hammer in boiler feed pump applications, solves flow problems and lowers the cost of ownership. 

    The WLC Check Valve is a non-slam, wafer style model known for its versatility and reliability in different applications. It can accommodate varying pressures, temperatures, and types of fluids while providing leak-free operation.

    The valve consists of the following components:

    • A protected spring, which facilitates silent closing
    • A seat (soft seat option is available)
    • A disc/stem assembly that utilizes a center/dual-guided stem
    • A bushing that is specifically rated for high-pressure applications
    • The body of the valve has a 316 stainless steel trim, and is offered with either Wafer RF or Wafer RTJ ends

    To learn more, click to download the WLC Check Valve cut sheet or contact the team at Campbell-Sevey.

  • Holiday Hours

  • CenterPoint Presents $140,570 Rebate Check for New Process Boiler Plant

    CenterPoint Energy presented First District Association in Litchfield, MN a rebate check for $140,570.00. It's one of the largest rebate checks CenterPoint has presented this year. The boilers were part of CenterPoint’s "Commercial Hot Water and Steam Boiler Rebate" and the dampers were part of their "Commercial Boiler Component Rebate" program.

    First District is a dairy cooperative that produces exceptionally high-quality dairy ingredients. Working with Campbell-Sevey, First District installed four (4) new process boilers in the fall/winter of 2017/2018 year to increase their steam energy production. 

    CenterPoint Energy Key Account Manager, Russ Wagner, was on hand along with other representatives from CenterPoint, Campbell-Sevey and First District, to present First District CEO, Clint Fall with the "enormous" check. 

    CenterPoint Energy's Commercial/Industrial Rebate Program for businesses includes high-efficiency steam boiler and other heating system rebates, steam trap rebates, boiler tune-up rebates and more. 

    Boilers are some of the hardest working pieces of equipment in a facility. It's really the heart of a process facility like First District. This equipment provides the heat energy necessary to process product, the building heat you need in the winter, and the hot water you need all year round. If you don't have steam, your plant is completely shut down. However, the cost to generate that steam can be high. That's why installing high-efficiency boilers is key to saving money. 

    To learn more about CenterPoint Energy's rebate programs visit their website or contact the efficiency experts at Campbell-Sevey. CenterPoint Energy has recognized Campbell-Sevey for the past 3 years as a top energy Trade Partner Ally.

  • Test Your Knowledge: Longitudinal and Circumferential Stress

    What is the relationship between longitudinal stress and circumferential stress:

    A. They are the same

    B. Longitudinal stress is twice circumferential stress 

    C. Circumferential stress is twice longitudinal stress

    D. There is no fixed relationship between the two

    And the answer is...

    C. Circumferential stress is twice longitudinal stress

    Internal pressure can be produce by water, gases or others. When a thin – walled cylinder is subjected to internal pressure, three are two mutually stresses:

    • Circumferential or Hoop stress
    • Longitudinal stress

    Circumferential or Hoop Stress: This is the stress which is set up in resisting the bursting effect of the applied internal pressure and can be most conveniently treated by considering the equilibrium of the cylinder. The hoop stress is the force exerted circumferentially (perpendicular both to the axis and to the radius of the object) in both directions on every particle in the cylinder wall.

    The effect of this may split the pipe into two halves. The failure of the pipe in two halves in fact is possible across any plane, which contains diameter and axis of the pipe. Elements resisting this type of failure would be subjected to stress and direction of this stress is along the circumference. 

    Longitudinal Stress: Consider a cyclinder that could have closed ends and contain a fluid under a gauge pressure. Then the walls of the cylinder will have a longitudinal stress as well as a circumferential stress.

    Considering that the pipe ends are closed and pipe is subjected to an internal pressure ‘P’ the pipe may fail. Elements resisting this type of failure would be subjected to stress and direction of this stress is parallel to the longitudinal direction of the pipe. 

    Radial stress: Radial stress can also be a factor in thick-walled pipe. It is stress in directions coplanar with, but perpendicular to, the symmetry axis. The radial stress is equal and opposite to the gauge pressure on the inside surface, and zero on the outside surface.

  • 3 Reasons to Get Coils from a Custom Coil Manufacturer vs. an OEM

    There are lots of applications where HVAC coils are used. Most are either manufactured by a an OEM or a custom coil manufacturer. Both play an important role in the market, however there are some key distinctions which can make it more favorable to have your coils custom manufactured. 

    1. Nearly any type of coil can be created from the same manufacturer

    Custom coil manufacturers have the flexibility to create nearly any type of coil you need, regardless of size or capacity. This allows you to go to one source for all your needs. OEM manufacturing facilities are designed to produce large volumes of certain sizes and designs to maximize efficiency. The can't easily switch from doing custom orders one day and creating custom coils the next. 

    2. Custom created to meet your exact requirements for replacement or design/build

    Each custom coil manufactured is designed to meet your exact specifications and needs. If a coil fails in an existing HVAC system, they can design an exact replacement. If a new piece of equipment is being created, designers discuss your exact needs and load requirements to provide innovation solutions and ensure the coil will operate at peak efficiency under all operating conditions. OEM manufacturers prefer to tailor you requirements to their existing process.

    3. Shipped when YOU want

    If a custom order comes into an OEM manufacturer while they are in the middle of producing a large order, they can only fit it into their schedule when it's convenient, rather than when you need it. Custom coil manufacturers have flexibility built into their process allowing them to quickly realign their focus. This ensures you get the exact coil you need, when you need it.

    Get the solution that best fits your needs

    As you can see, while OEM coil manufacturers are well suited for high-volume, standard coils, custom coil manufacturers, like Modine, are an ideal solution for replacement coils, lower volume design/build coils, or non-standard size/volume coils. They provide heat recovery and round tube plate fin (RTPF) coils for the commercial and residential HVAC markets.

    At Campbell-Sevey, we work directly with you to determine your needs and provide solutions that best fit your requirements. To learn more contact the team at Campbell-Sevey.

  • CS Hires New Administrative Assistant

    As you walk into the doors of our Campbell-Sevey office, one of the first people you’ll see is our new Administrative Assistant, Aimee Fish.

    Aimee grew up in Brooklyn Park with two older brothers who piqued her interest in sports. She started dancing at the age of 3. As she grew, competitive swimming and playing basketball on a traveling team followed. She eventually played basketball and lacrosse throughout high school. After high school she began her career in customer service and system training, which makes her perfect for her role with us.

    When she’s not lending her cheery disposition to our customers, Aimee has a lot of other interests. She enjoys having game and movie nights with her family, going to her parents’ lake house and traveling. She does volunteer work like packing food for the Feed My Starving Children organization and at her kids' school. Then of course it’s taking her kids swimming and playing with her two adopted dogs, Sota and Willie, and a cat named Ariel.

    As for joining Campbell-Sevey, Aimee is excited. *I really enjoy my co-workers, everyone is very friendly”, Aimee said. “I look forward to actually understanding all of the jobs I am going to be doing.” Well, one person she’ll learn from is her mom, Deb Jester, who has been managing our accounting department for the past 13 years.

    Welcome aboard Aimee! We are thrilled to have you as part of our team.

  • Steam Tip 18: Deaerators in Industrial Steam Systems

    Deaerators are mechanical devices that remove dissolved gases from boiler feedwater. Deaeration protects the steam system from the effects of corrosive gases. It accomplishes this by reducing the concentration of dissolved oxygen and carbon dioxide to a level where corrosion is minimized. A dissolved oxygen level of 5 parts per billion (ppb) or lower is needed to prevent corrosion in most high-pressure (>200 pounds per square inch) boilers. 

    While oxygen concentrations of up to 43 ppb may be tolerated in low-pressure boilers, equipment life is extended at little or no cost by limiting the oxygen concentration to 5 ppb. Dissolved carbon dioxide is essentially completely removed by the deaerator. 

    How They Work 

    The design of an effective deaeration system depends upon the amount of gases to be removed and the final oxygen gas concentration desired. This in turn depends upon the ratio of boiler feedwater makeup to returned condensate and the operating pressure of the deaerator. 

    Deaerators use steam to heat the water to the full saturation temperature corresponding to the steam pressure in the deaerator and to scrub out and carry away dissolved gases. Steam flow may be parallel, cross, or counter to the water flow. The deaerator consists of a deaeration section, a storage tank, and a vent. In the deaeration section, steam bubbles through the water, both heating and agitating it. Steam is cooled by incoming water and condensed at the vent condenser. Noncondensable gases and some steam are released through the vent. 

    Steam provided to the deaerator provides physical stripping action and heats the mixture of returned condensate and boiler feedwater makeup to saturation temperature. Most of the steam will condense, but a small fraction (usually 5% to 14%) must be vented to accommodate the stripping requirements. Normal design practice is to calculate the steam required for heating and then make sure that the flow is sufficient for stripping as well. If the condensate return rate is high (>80%) and the condensate pressure is high in comparison to the deaerator pressure, then very little steam is needed for heating and provisions may be made for condensing the surplus flash steam. 

    Deaerator Steam Consumption 

    The deaerator steam consumption is equal to the steam required to heat incoming water to its saturation temperature, plus the amount vented with the noncondensable gases, less any flashed steam from hot condensate or steam losses through failed traps. The heat balance calculation is made with the incoming water at its lowest expected temperature. The vent rate is a function of deaerator type, size (rated feedwater capacity), and the amount of makeup water. The operating vent rate is at its maximum with the introduction of cold, oxygen-rich makeup water. 

    Additional Benefits 

    Deaerators provide the water storage capacity and the net positive suction head necessary at the boiler feed pump inlet. Returned condensate is mixed with makeup water within the deaerator. Operating temperatures range from 215° to more than 350°F, which reduces the thermal shock on downstream preheating equipment and the boiler. 


    The deaerator section and storage tank and all piping conveying hot water or steam should be adequately insulated to prevent the condensation of steam and loss of heat. 

    Function Clarification 

    The deaerator is designed to remove oxygen that is dissolved in the entering water, not entrained air. Sources of “free air” include loose piping connections on the suction side of pumps and improper pump packing. 

    Pressure Fluctuations 

    Sudden increases in free or “flash” steam can cause a spike in deaerator vessel pressure, resulting in re-oxygenation of the feedwater. A dedicated pressure-regulating valve should be provided to maintain the deaerator at a constant pressure. 

    This tip is provided by the U.S. Department of Energy - Energy Efficiency and Renewable Energy and originally published by the Industrial Energy Extension Service of Georgia Tech. For suggested actions and resources, click to download the complete US Department of Energy Tip Sheet. 

  • 6 Factors to Consider When Designing a Humidification System

    Humidity affects many properties of air and of materials in contact with air. A huge variety of manufacturing, storage and testing processes are humidity-critical that's why humidity controls are used to prevent condensation, corrosion, mold, warping or other spoilage. However the cost of controlling humidity, through air-conditioning systems or other means, can take a significant amount of energy. To minimize these costs, there are six key factors to consider:

    1. Survey the building construction
    2. Calculate humidification load
    3. Determine the best energy source
    4. Select proper water type
    5. Humidification system location
    6. Appropriate controls selection

    1. Survey the building construction/design of the building envelope

    A humidity controlled building must not leak large amounts of air. To minimize air leaks install a continuous vapor barrier, examine all areas of conditioned air loss (exhaust fans, windows, doors, etc), locate vapor retarders on warm side of wall (inside from insulation) and avoid thermal bridge (single glazing, metal casing of doors/windows).

    2. Calculate humidification load

    Humidification load is dominated by outdoor air entering and leaving the building or space. Dry outdoor air enters via two paths – ventilation or infiltration. Load is based on the amount of outside air entering the building or space. If the calculation isn't done properly under sizing can occur leading to the inability to maintain desired relative humidity. If over sizing occurs the result is irregular humidity levels or wet ducts. 

    3. Determine the best energy source

    Adiabatic humidifiers use heat from surrounding air to change water into vapor. Examples include: pressurized water atomizers, ultrasonic, wetted media and compressed air foggers. Isothermal Systems use heat added to the water. These types of systems include: steam boilers, unfired steam generators, electrode type (plastic cylinders), electric resistive heater type, steam heat exchangers and gas-fired humidifiers.

    4. Select proper water type

    Types of water vary for humidification systems, but make a difference in performance and maintenance. Common types include: potable (tap) water from city or well source, softened water, reverse osmosis (RO) water – filtered to remove most of minerals/contaminants, and de-ionized (DI) water – high quality and free of minerals/contaminants.

    5. Humidification system location

    Several factors go into determining the best location: access to energy (electric, gas or steam), water source, drain availability, and access for maintenance. Also important is the available absorption distance which will affect system choice. Dispersed steam must be absorbed before it comes in contact with downstream objects such as fans, vanes and filters. Adiabatic units need to be positioned where sufficient heat is available to vaporize water being added.

    6. Appropriate controls selection

    When selecting humidity controls it's important to determine: desired relative humidity set point, acceptable relative humidity variances, space temperature (stable temperatures must be maintained for accurate humidity control), and component quality – select controls that match the application.

    For help in designing a humidification system for your exact application, contact the team at Campbell-Sevey


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952-935-2345  address15350 Minnetonka Blvd., Minnetonka, MN 55345

Products We Carry

  • Hot Water Boilers
  • Watertube Steam Boilers
  • Firetube Steam Boilers
  • Deaerators
  • Heat Recovery Steam Generators (HRSG’s)
  • Automatic Recirculation Valves
  • Economizers
  • Gas-Fired Water Heaters
  • Gas-Fired Humidifiers
  • Boiler/Generator Flue Stacks
  • Continuous Emissions Monitors (CEMS)
  • Pressure Reducing Valves
  • Safety and Relief Valves
  • Control Valves
  • Pressure Independent Control Valves
  • Expansion Joints, Guides, Anchors
  • Flash Tanks
  • Flow Meters
  • Balancing Valves
  • Check Valves
  • Separators
  • Pumps
  • Pressure Booster Systems
  • Piston Valves
  • Heating/Cooling Coils
  • Plate and Frame Heat Exchangers
  • Shell and Tube Exchangers
  • Water Heaters
  • Steam Humidifiers
  • Vacuum Systems
  • Condensers
  • Steam Traps
  • Wireless Steam Trap Monitors
  • Tube Bundles
  • Direct Gas-Fired Space Heaters
  • Direct Gas-Fired Make-Up Air Units
  • Unit Heaters
  • Strainers
  • Air Vents
  • Liquid Drainers
  • Heat Transfer Packages
  • Digital Water Mixing Valves
  • Air Cooled Condensers/Dry Coolers
  • Steam Filters
  • Electric Condensate Pumps
  • Steam/Air-Powered Condensate Pumps
  • Packaged Condensate Pump Skids