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    Spiral Plate Heat Exchangers

    The Spiral Plate Heat Exchanger is actually a family of heat exchangers based on the basic Type A spiral core. A variety of spiral heat exchangers can be created by adding or taking away weld-seams and head arrangements. This versatility makes the spiral attractive to many services and applications.

    Spiral Plate Heat Exchangers

    The Spiral Plate Heat Exchanger is actually a family of heat exchangers based on the basic Type A spiral core. A variety of spiral heat exchangers can be created by adding or taking away weld-seams and head arrangements. This versatility makes the spiral attractive to many services and applications.

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    Slurries:​​ High Viscous:

    Paper & Pulp Distillation Columns Bottom Coolers

    Digester Heaters for Waste Treatment Fatty Acid Coolers

    Textile and Laundry Plants Resin/Plastic Feed Heaters (20,000 Cp)

    PVC Production

    High Temperature & Low Temperature: High Efficiency & Close Approach:

    Exhaust Coolers Heat Recovery and Cogeneration

    High Temp Gas-to-Gas, (up to 1650°F) Bottoms to Feed Interchangers

    Liquid Nitrogen & other Cryogenics Partial & Knockback Condensers

    Vacuum Service

    Thermosiphon Reboilers

    Types of Elanco Spiral Heat Exchangers​

    Type A

    Spiral in both circuits, removable heads on both sides for clean out. With a Type A, both fluids are in spiral flow and in true counter flow. Used for fouling flows on both sides where cleaning of the prime surface is required. Example: bottoms to feed interchanger.

    Type B

    Similar to Type A, both fluids are in spiral flow, true counter flow. Spiral in both circuits, removable head on one side and all welded on other side. Used when only one of the flows is fouling or when gasketing of one flow is a problem. Example: condensate cooler with river (muddy river water on cleanable side).

    Type C

    Spiral in both circuits, all welded on both sides, and once again both fluids are in spiral flow, true counter flow. Used when the flows are clean, when gasketing is problematic, or when cost must be kept to a minimum. Example: deionized water to tap water.

    Type D

    Spiral/axial circuit for boiling or condensing on one side or both sides. Could have both, one or none of the heads removable for cleaning. The boiling feed enters as liquid to the spiral from the periphery, and boils up axially. Vapors enter the center, condense down and exit the peripheral. With careful design, sub-cooling can be controlled. Example: sludge header with steam, or natural circulation reboiler for distillation.

    Type E

    Spiral on one circuit, axial on the other circuit. The spiral side is all welded, and the axial side flows through the heat exchanger with no spiral action. Used when there is a large difference in flow volume. Example: vacuum cold traps, or air-to-water applications.

    Source : www.elancoheatexchangers.com

    Nexson Spiral plate heat exchanger : a customized design for your field

    Nexson Group designs and produces strong and versatile spiral plate heat exchangers, a proven technology over the years for fouling duties / drop in replacement.


    Proven technology over the years for fouling duties / drop in replacement

    Thanks to its thermal efficiency, its strength and its versatile design, the Spiral Plate Heat Exchanger has proven since 1930 to be essential in fields as various as Refineries, Petrochemical, Oil&Gas or Environment

    Able to work in extreme conditions (of pressure and temperature), this single channel heat exchanger, with self-cleaning effect, has become the alternative to the shell & tube exchangers.

    Nexson Group designs, develops and manufactures your spiral heat exchanger in the formable and weldable materials of your choice (GreenSpiralTM ). More compact and 3 times more thermally efficient than tubular heat exchangers, this Spiral heat exchanger provides substantial savings in installation, operation and maintenance.


    Our Spiral Plate Heat Exchangers are made of 2 concentric channels on which spacer pins are welded to form the channel’s gaps. Each channel gap and the width of the channels are selected to meet each Customer’s specific requirement and working conditions. It permits to take into account the flow rates, the sizes of the particles for fouling fluids and the pressure drops. These spacer pins facilitate turbulent flow in each channel.

    Single channelThe single channel flow of our heat exchangers makes it a unique feature in the world.Self cleaning effectThanks to the single channel configuration, a turbulent flow is created to handle tough medias.

    As it is a single channel heat exchanger, if there is any cross section reduction inside the channel, flow velocity will increase flushing out the deposit.

    Fouling dutiesOriginally the spiral plate heat exchangerwas mainly used in the pulp and paper industry where fouling problems were frequent when using classical shell and tube exchangers (or multi channels heat exchangers) due to fibers in the effluents.Tough process conditionsBecause of their robust construction Nexson spiral heat exchangers are meant to handle cycling duties. Nexson spiral heat exchangers can expand without mechanical failure when pressured or by increase in temperature.Spiral plate heat exchangers can be manufactured in any material that can be formed and welded (carbon steels, stainless steels, duplex, super-duplex, titanium, nickel alloys, etc…) – SA 516 Gr60, SA 516 Gr70, 304 / 304L, 316 / 316L, UNS S310803, UNS S32205, UNS S32750, 904L, 254 SMO, C276, C22, C2000, Titanium…

    Nexson spiral heat exchangers are used for a design pressure from full vacuum to 80 barg and at -200°C design temperature to 450°C.

    Nexson Group supplies a wide range of spiral heat exchangers from customized to standard units.



    Self-cleaning effect

    For fouling duties

    Single channel heat exchanger

    Alternative to the shell & tube exchangers




    Any condensing / vaporizing applications

    Low pressure drop

    Working conditions under vacuum

    Can be column mounted




    Special design to handle wastes

    Biological treatment – Biogas plants

    Alternative to tube in tube heat exchanger




    High temperatures and high pressures conditions up to 200 barg / 450°C

    For fouling duties

    Self-cleaning effect




    For large condensing applications

    Low pressure drop

    Alternative to the shell & tube exchangers falling films




    Steam heating with fouling duties

    Low pressure drop

    Robust construction for cyclings


    Source : www.nexson-group.com

    SONDEX® Spiral heat exchangers

    SONDEX® spiral heat exchangers easily handle the most challenging media such as sludges and slurries, and are designed for very efficient heat transfer.

    SONDEX® Spiral heat exchangers

    Contact us Overview Overview Related products FAQ Contact us

    ⌀1400 spiral heat exchanger

    Designed and custom made to handle sludges, slurries, waste water, wood pulps, hydrocarbons with high viscosity, and fouling liquids that contain fibers and solids, our SONDEX® spiral heat exchangers are the ultimate solution for even the most challenging, high-viscosity media. Since we use coiled metal sheets instead of tube bundles, we can achieve very high thermal performance without sacrificing the plate gap that lets the media flow unimpeded.

    What does that mean for you?

    The core of our spiral heat exchangers is the concentric spiral plate coils nested in the shell. The coils form two completely separated channels with a countercurrent flow arrangement that allows the heat exchanger to achieve very close temperature approaches, making our spiral units excellent for heat recovery applications.

    To maintain the plate gap, we weld spacer studs onto the coils. Besides supporting the plate gap, the studs also greatly contribute to the turbulent flow. Our Free Flow option for spiral heat exchangers is stud-less, sacrificing some turbulence in exchange for a much larger plate gap for the most challenging media. These options enable us to efficient handle any duty and we offer you a choice of regular or Free Flow channels on both sides, or a combination of the two.

    No application or duty is the same for a spiral heat exchanger, which is why we customize every single one of our units from the ground up according to your specifications. We are dedicated to providing you with an individually optimized solution designed for maximal uptime and reliable operation.

    Easy maintenance and cleaning

    The spiral coil itself also contributes to the turbulent flow, and the single-channel design helps alleviate fouling with a “self-cleaning” mechanism. Accumulated deposits create local increases in velocity, creating a scrubbing effect that is enough to loosen the build-up in fouling in most cases. This allows our SONDEX® spiral heat exchangers to operate in very long sessions without maintenance or cleaning.

    Some media, however, are so challenging that the heat exchanger requires more frequent maintenance and cleaning. With this in mind, we have designed hinged covers that are sealed with C-clamps, creating a swing door that is very easy to open and close without any special tools required, letting you access the entire coil for inspection and cleaning.

    Micro plate technology

    Our heat exchangers with the new state-of-the art Micro Plate™ technology feature next-generation efficiency and performance – giving you more from your district heating and cooling applications.

    Micro plates

    SONDEX® Free flow patterns

    The SONDEX® Free Flow pattern is designed to treat media that is unsuitable for regular heat exchangers due to high viscosity, fiber and particle contents, or considerable risk of fouling.

    Free flow plates


    Dairy/food/beverage industry

    Biogas industry Wastewater industry

    Pulp and paper industry

    Heavy industry

    Petrochemical industry

    Chemical industry

    Technical specifications

    Connections from DN32 to DN300

    (Frames designed according to FEA and PED 2014/68/EU (EN13445) and ASME sec VIII, Div. 1 construction standards)

    Shell materials: Carbon steel, stainless steel

    Spiral materials: Carbon steel, stainless steel

    Working pressure up to 10 bar (145 psi). Higher pressure available upon request

    Working temperature up to 200 °C (392 °F)

    Features and benefits

    Single-channel design that generates high shear rates which contribute to a self-cleaning effect, preventing clogging of the unit. Spiral heat exchangers are the perfect solution for challenging, high-viscosity media.

    The channel size is selected to fit the flow and qualities of the media. The many variations in diameters and widths of the spiral coil allow for many different combinations, which mean that we can create the optimal solution for every duty.

    Designed to handle a very aggressive temperature program and with a wide range of materials and plate thicknesses available, we customize each spiral heat exchanger to match the requirements of any application.

    Limited need for maintenance and cleaning ensures extended operational uptime. If the need for cleaning arises due to particularly difficult media, the hinged covers provide easy access to the entire heat transfer surface.

    Very compact solutions, our spiral heat exchangers have minimal space requirements. Despite their small stature, the long, curved flow paths allow for very high heat transfer coefficients up to twice as high as their shell and tube counterparts.

    Related products

    SONDEX® Fishbone plates

    SONDEX® Fishbone plate pattern technology is used for the vast majority of our plate heat exchangers. The pattern is designed for high thermal performance while using the allowed pressure drop in the most efficient manner. Available with different pressing depths, pattern pitch and angles – each plate has a pattern that is optimized for a certain duty.

    Source : www.danfoss.com

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