ST tube in tube heat exchangers find their application where fluids of high viscosity, density or high fiber or solid particle contamination are subjected to heat treatment, e.g. at wastewater treatment plants.
The HEXONIC ST tube in tube heat exchanger is designed for applications where fluids with high viscosity, high density, or significant fiber and solid particle contamination are subjected to heat treatment. It is especially suited to demanding duties such as wastewater treatment, where conventional exchanger designs may be prone to blockage or difficult maintenance.
The presence of mechanical contamination often causes sedimentation on exchanger walls, which can block flow paths and reduce performance. The ST series addresses this with large-diameter tubes that ensure freer flow and a dismountable design that allows mechanical cleaning of the heat exchange surface. Made of stainless steel, the exchanger also offers corrosion resistance and long-term, failure-free operation with a simple, robust construction.
Key Features
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Dismountable designThe ST exchanger can be opened for mechanical cleaning, making it well suited to media that contain fibers, solids, or other contaminants.
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Large-diameter tubes for freer flowThe large tube diameters help reduce the risk of blockage and support reliable operation with contaminated or viscous fluids.
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Suitable for difficult mediaThe ST series is intended for fluids with high viscosity, density, or high fiber or solid particle contamination.
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Stainless steel constructionStainless steel ensures corrosion resistance in demanding environments.
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Expandable heat exchange surfaceThe heat exchange area can be increased by adding further sections according to the media type and operating parameters.
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Broad dimensional rangeModels are available with various nominal diameters and modules in 3 m and 6 m lengths, giving flexibility in system design.
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Long-term reliable operationThe simple construction supports long-term, failure-free service.
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Certified qualityAirtightness and manufacturing quality are confirmed during pressure testing and quality control, and that exchangers are manufactured in accordance with PED or ASME.
Design
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SectionThe exchanger consists of appropriate number of sections connected in series with knee tubes and set on a frame.
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Frame
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Knee tube
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Expansion jointIt is used for the tubes when there is a significant temperature difference between the product side and the shell side.
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Connection
Tube in tube
The single section of the ST exchanger consists of two tubes with different nominal diameters. The tube with smaller diameter (product side) is installed inside the tube with the larger diameter (shell side).
Technical Specifications
| Parameter | Specification |
|---|---|
| Design Standards | PED, ASME |
| Max Design Pressure | • PRODUCT SIDE — 16 bar/ 232 PSI • SHELL SIDE — 10 bar/145 PSI |
| Max Design Temperature | 110°C/ 230 °F |
| Shell Diameter Range | 60.3–273 mm |
| Tube Materials | inner tube (product side): stainless steel 316L / 1.4404 |
| Shell Materials | outer tube (shell): stainless steel 304L / 1.4307; frame: stainless steel 304L / 1.4307 |
| Design Types | tube-in-tube; dismountable; 3 m and 6 m modules; welded shell-side connections optional |
| Connection Types | Flanges from DN32 (1 1/4″) to DN200 (8″) |
| Certification | PED, ASME |
Applications
Full range
models with various nominal diameters and modules with 3 meters and 6 meters in length ensures flexibility in system design
Quality guarantee
airtightness and high quality make of exchangers are confirmed during pressure testing and quality control
Technical support
we help selecting appropriate exchanger for particular application and technical requirements
Certificates and standards
exchangers manufactured in accordance with PED or ASME
Frequently Asked Questions
The HEXONIC ST is designed for heat treatment of fluids with high viscosity, density, or high fiber and solid particle contamination. It is particularly suitable for wastewater treatment and similar applications where dirty media can cause blockage in standard exchangers.
The exchanger uses large-diameter tubes to support freer flow and has a dismountable design that allows mechanical cleaning of the heat exchange surface. These features help it handle contamination that would otherwise settle on exchanger walls and block the flow.
Yes. HEXONIC states that the heat exchange surface can be increased by adding further sections, with the number depending on the type of media and the operating parameters.
The ST is made of stainless steel for corrosion resistance, is available in different nominal diameters and 3 m or 6 m modules, and can include an expansion joint when there is a significant temperature difference between the product and shell sides.
