Spiral tube heat exchangers provide high efficiency in a small footprint for high pressure and severe service applications. The heat exchanger consists of a dual manifold multi-tube spiral assembly inserted into a shell, where two paths are created for full counterflow heat transfer.
•Up to 40% more efficient than a typical shell and tube heat exchanger
•Pressure ratings up to 5000 psi (345 bar)
•Temperature ratings up to 1000°F (540°C)
•Compact and lightweight
•Highly resistant to thermal and pressure shock
•Standard tube-side material is 316 Stainless Steel; shell-side is carbon steel; exotic materials available for both sides
•Bolted or welded shell construction
•Heat transfer areas up to 150 ft2 (14 m2)
The tube in the Exchanger is as shown below figure.
Features
Flow rates to 100 GPM (378 LPM)
Sample conditions up to 5000 psi (345 bar) and up to 1000° F (540° C)
Optimal design for corrosive fluid/gases
Vapor condensing/gas stripping capabilities
High flow in a small footprint
Highly resistant to thermal and hydraulic shock
Bolted or all welded shell
Numerous flow path and connection configurations
Compact and lightweight, easy to install
CROSS SECTION OF A SPIRAL TUBE HEAT EXCHANGER
SPECIFICATIONS
Materials:
Shellside . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carbon Steel & Stainless Steel
Tube Bundle. . . . . . . . . . . . . . . . . . . . . . . . . . . Stainless Steel, Hastelloy®, Inconel® and other alloys
Standard Pressure Rating:
Shellside . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 psig (10.3 barg) @ 400° F (204° C)
Tubeside. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . up to 5000 psig (345 barg) @ 1000° F (540° C)
Construction:
Shellside . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bolted or welded with NPT, FLG, SW or BW connections
Tubeside. . . . . . . . . . . . . . . . . . . Welded tube to manifold joints with NPT, FLG, SW or BW connections
Surface Area:. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 177 ft² (0.1 to 16 m²)
Description
A spiral tube heat exchanger is a coil assembly fitted in a compact shell that optimizes heat transfer efficiency and space. Every Sentry spiral coil assembly has welded tube to manifold joints for durability and strength. The coil assembly is welded to a head and fitted in a compact shell. The spaces or gaps between the coils of the spiral tube bundle become the shell side flow path.
The spiral shape of the flow for the tubeside and shellside fluids creates centrifugal force and secondary circulating flow that enhances the heat transfer on both sides in a true counterflow arrangement. Since there
are a variety of multiple parallel tube configurations(diameter, number and length), efficiency is not compromised by limited shell diameter sizes as it is in shell and tube designs.
The profile of a spiral is very compact and fits in a smaller footprint than a shell and tube design. Since the tube bundle is coiled, space requirements for tube bundle removal are significantly reduced. When exotic material is required, a spiral tube heat exchanger minimizes the material used since manifolds replace the channels, heads and tubesheets of a conventional shell and tube design. The shell side is usually smaller than a comparable shell and tube design and there are no requirements for tube supports or pass dividers.
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