XLG®I-Series Industrial Multitube heat exchangers are manufactured from stainless steel and consist of a bundle of corrugated tubes mounted within an outer tube (which forms the outer shell). The fluid to be treated (the product) flows through the interior of the tubes forming the tube bundle and the service fluid outsider the inner tubes, through the shell.

The range of units uses shell and inner tube diameters to satisfy the flow rates of the process fluids and the inner tubes are corrugated to significantly enhance the rate of heat transfer. 

The exchanger incorporates a expansion bellows welded to the shell to absorb the thermal expansion that takes place between the shell and the tube bundle. The fluid flowing through the inner tubes (the product) and the fluid circulating through the outer shell (the service) are completely isolated from each other, heat being transferred through the inner tube walls.

All of our units are designed and manufactured according to the CE marking regulations contained in the European Pressure Directive (97/23/EC) and are CE marked when we are permitted to do so, and may be designed according to ASME VIII Div.1 if needed.

Materials of construction

All product wetted components (interior tubes, bends etc.) are manufactured from AISI 316L stainless steel but for more aggressive fluids a range of Duplex stainless steels are also available.

The service side components are normally made from AISI 304 stainless steel but AISI 316L and Duplex steels may be used when required.

Areas not in contact with the working fluids are normally constructed from AISI 304 stainless steel.

For the removable tube bundle units silicone rubber is normally used for the O ring seals and connection gaskets or seals but a wide range of alternative elastomers are available when specific applications require them. Alternative materials can be offered for all wetted components on application.

The internal product wetted surfaces have a surface finish roughness of <0.8 µm while the exterior surfaces have a matt finish. Support frames are manufactured from AISI 304 stainless steel, also with a matt surface finish.


The all welded XLG®I-Series heat exchangers use DIN/ANSI standard flanges on both product and service connections but alternative flanges to any other international standard can be supplied.

Design Conditions

Minimum and maximum allowable working temperatures: -40°C / +180°C
Minimum and maximum allowable working pressures: 10 Bar(g)/Full vacuum
Higher pressures and temperatures are possible on request.

Standard dimensions

XLG®I-Series multitube heat exchangers can be delivered in various lengths, the standard dimensions being approximately 500 mm, 750 mm, 1000 mm, 1500 mm, 2000 mm, 3000 mm and 6000 mm.

Shell diameters can reach from Ø 50.8 mm up to 508.00 mm. The tube thickness used will depend on the design conditions for each application.

The diameters of the interior tube and its wall thickness will be chosen to meet the requirements of each application.

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