Lee's Summit,  MO 
United States
  • Booth: 3309

Sterling Deaerator Company

Sterling Deaerator Company has been a leading worldwide supplier of spray, tray, package, and vacuum deaerators for over thirty years.  Sterling also offers continuous blowdown equipment, steam accumulators, blowdown heat recovery systems, surge tanks, and HTF expansion vessels. Sterling has the ability to handle even the largest projects efficiently from start to finish, including Engineering, Drafting, Design, Fabrication, and Quality Assurance.

Brands: Deaerator Deaerators Continuous Blowdown Intermittent Engineering Fabrication Dissolved oxygen HTF Heat Transfer Fluid Expansion Vessels Accumulators Steam Package Vacuum Scrubber Tray


  • Deaerators
    Sterling Deaerator offers spray-tray, small scrubber type, vacuum, and package deaerators. Sterling has vast experience in all applications, serving Power Generation, Petro-Chemical, Cogeneration, Pulp and Paper, Light Industrial, and other industries....

  • Sterling has a design staff with over a century of experience to offer customers the most economical solution for each application. Through the aid of custom-designed software, Sterling can respond quickly to customer inquiries and match the customer’s needs with Sterling’s proven technology.

    Sterling is an active member of the Heat Exchange Institute (HEI) and continues to work in developing design standards for deaerators through HEI. Sterling is also active in the ASME and played a crucial role in the rewriting of ASME Performance Test Code Section 12.3. PTC 12.3 is the most widely accepted code for deaerator performance testing. Sterling is also active in the American Boiler Manufacturer’s Association.

    Models Available

    • Model HT - Horizontal type with no storage capacity; spray-tray technology
    • Model VT - Vertical type with no storage capacity; spray-tray technology
    • Model DT - Dome type with horizontal storage; spray-tray technology
    • Model VTHS - vertical deaerator with horizontal storage; spray-tray technology
    • Model HTHS - Horizontal deaerator with horizontal storage; spray-tray technology
    • Model DS - Dome type with integral, horizontal storage; spray-scrubber technology
    • Model UT - Upright with integral storage; spray-tray technology
    • Model HS - Horizontal type with integral horizontal storage capacity; spray-scrubber technology
    • Vacuum Type - Deaerators designed to operate under vacuum conditions
    Package Units - Deaerator includes: support stand, pumps, piping, valves, strainers, and control systems.
  • Sterling Spray Valve
    Sterling utilizes two designs of its unparalleled spray valve for maximum dissolved gas removal, using the standard Single Cone and the High Efficiency Dual Cone Spray Valve to increase performance in difficult applications....

  • Name:

    Sterling Spray Valves


    Sterling utilizes two designs of its unparalleled spray valve for maximum dissolved gas removal, using the standard Single Cone and the High Efficiency Dual Cone Spray Valve to increase performance in difficult applications.


    Standard Single Cone Spray Valve:

    Sterling’s standard single cone is recommended for normal operation.  The Sterling Spray Valve is cast from noncorrosive type 316L stainless steel to ensure maximum life. This self-adjusting spray valve can handle flow up to twice its rated capacity, while maintaining spray pattern. Because the Sterling Spray Valve is hydraulically non-guided, solid particles and debris pass harmlessly through clogging or reducing performance.  The thin film of feedwater sprayed into the steam atmosphere provides transfer and gas removal. The Sterling Spray Valve produces that thin cone of feedwater consistently over its operating range, resulting continuous deaerating performance.

    Dual Cone Spray Valve:

    Sterling’s patented (US Patent # 5,862,992) High Efficiency Dual Cone Spray Valve is utilized in difficult applications. Sterling’s Dual Cone Spray Valve adds a second, slightly smaller, cone of feedwater which produces a 71% increase in steam to water surface contact area within the deaerator’s spray zone. The Dual Cone Spray Valve is best suited for installation in existing deaerators to increase performance and reduce chemical costs. Upgrading is especially beneficial for underperforming deaerators. The Dual Cone Spray Valve is a direct replacement as well as most of our competitors’ spray valves, making it ideal for retrofit applications. Sterling also offers mounting adaptors for conversion from some competitors’ older designs to the Dual Cone’s bolting pattern.

  • Sterling Tray Assembly
    Sterling Tray Assemblies are utilized in our tray-type deaerators. Sterling’s rugged, resilient stainless steel tray assemblies include models utilizing rivets or Perma-Lock clips and are designed for maximum feedwater retention and deaeration....

  • In addition to Sterling’s superior spray valve, our tray-type deaerators are also equipped with the Sterling Tray Assembly. The Sterling Tray Assembly is constructed of 16-gauge, type-430 stainless steel and is fastened in one of two ways, with stainless steel rivets or sturdy, interlocking stainless steel clips. Each tray assembly consists of two staggered rows of four tray channels. This staggered tray channel pattern ensures maximum feedwater retention and reduced pressure drop, which results in optimum heating surface and deaeration. The Sterling Tray Assembly, as well as the Sterling Spray Valve, is designed to be resilient: able to withstand upset and extreme conditions resulting in reduced downtime. Rugged construction combined with lower steam pressure drop extends deaerator life even under the most severe operating conditions. Sterling also offers trays for no-longer-existent companies, such L.A. Water Treatment. Sterling can replace most competitors’ trays.
  • Sterling Blowdown Tanks
    Sterling Blowdown Tanks remove feedwater impurities which accumulate in boilers over time. Feedwater blown down from the steam drum and steam generator enters the tank and centrifugal forces separate the liquid from the vapor.

  • Even with the best pretreatment programs, boiler feedwater will contain some degree of impurities, such as suspended and dissolved solids. These impurities can accumulate inside the boiler over time. The increasing concentration of dissolved solids may lead to carryover of boiler water into the steam, causing damage to piping, steam traps, and even process equipment. The increasing concentration of suspended solids can form sludge, which impairs boiler efficiency and heat-transfer capability.

    To avoid boiler problems, water must be periodically discharged or “blown down” from the boiler to control the concentrations of suspended and total dissolved solids in the boiler.

    Sterling’s Blowdown Tank receives blowdown from the steam drum and steam generator. Sterling’s Blowdown Tank can also function as a gravity feed drain for the steam generator when the generator is drained for maintenance.

  • Sterling Heat Transfer Fluid Expansion Vessels
    Sterling’s HTF Expansion Vessels operate within a solar power plant, transferring heat energy from solar collectors to steam generators. Sterling’s design reduces thermal stresses caused by expansion and contraction during the thermal solar cycle....

  • Heat Transfer Fluid (HTF) Expansion vessels are component parts of a solar power plant and are designed to hold the HTF, which transfers energy from solar collector arrays (SCA’s) to steam generators.

    These vessels undergo extreme thermal cycling in their daily operation. The vessels begin to warm up at sunrise as energy becomes available and quickly reach maximum operating temperatures and remain there until the solar energy starts to fade and the vessels cool off. Shorter, less severe, thermal cycles also occur during the day when passing clouds partially obscure the sun and reduce the amount of solar radiation available. This thermal cycling results in stresses being induced, then reduced, on a frequent basis.

    Sterling, applying its vast deaerator experience, kept this fact in mind when designing the features of the Sterling Expansion vessels. Past vessel designs have suffered serious failures when the nature of this thermal cycling was not adequately considered. Sterling applies Finite Element Analysis techniques to both the vessel and accompanying saddle designs in order to reduce thermally-induced stresses and the subsequent failures that result.
  • Sterling Blowdown Heat Recovery Systems
    Blowdown Heat Recovery Systems (BHRS) recover heat which is lost during the blowdown process. Sterling’s BHRS recovers up to 90% of the heat energy that is otherwise lost. Heat recovery reduces the cost of deaeration and improves boiler efficiency....

  • All steam boilers must be blown down to reduce the amount of total dissolved solids in the boiler water. However, along with the solids, thermal energy is lost. Sterling’s Blowdown Heat Recovery System can recover up to 90% of the heat energy that would otherwise be wasted. The recovered heat is used to pre-heat boiler make-up water before it enters the deaerator and for low-pressure steam to heat water inside the deaerator, which reduces the cost to run the deaerator and improves overall boiler efficiency.

    Reducing the temperature of the blowdown before its disposal is a typical Code requirement. Therefore, a heat recovery system also eliminates the need to dilute blowdown with cold water before its disposal.

    Sterling’s Blowdown Heat Recovery system offers an attractive payback, depending on blowdown volume. Several boilers can be connected to a single heat recovery unit, reducing capital costs. Typical payback is under 12 months.

 Additional Info

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