Frigotherm Engineering (Pty) Ltd | Unit 9, 1055 Anvil Road, Robertville | Johannesburg | 1709 | Tel: +27 11 672 4203

Shell and Tube Heat Exchangers -


Safety Heat Exchangers Series SWF, SWP, SWF-HE            and SWP-HE
Safety heat exchangers are desigend as three chamber devices with straight internal tubes and fixed (F) or removable (P) tube bundle.  In each individual internal tube of the tube bundle a further smaller internal tube is installed.  These concentric internal tube pairs form radial gaps which  are interconnected by the design of the double tubesheets and thus produce the enclosed safety space.  A mixing of the flowing operating media is prevented in this way. This sealed safety space is filled with a special barrier fluid.  It is responsible for the heat transfer in the radial gap and functions as a transmitter in the leak monitoring system.  The safety area is sealed off and permanently monitored for pressure changes (pressure monitoring P). In the case of a leakage of the shell or tube sides, the corresponding pressure change within the safety space will be detected by the pressure control device and signalled accordingly.  The safety area is also equipped with an expansion tank (V) which prevents false alarms due to thermal volume or pressure changes. In conventional technical solutions with double tubes, the outer tube has a relatively rough  structure on its interior.  FRIGOTHERM, however, shifts the structure to the outside of the inner tube and uses a finer structure in a pyramid shape. The advantages of moving the structure to the inner tube are as follows: The contact area between the inner and outer tube of a double tube is increased by up to 80 %. Optimised distribution of safety channels. Heat transfer with or without transmitter fluid in the safety area. Optimum tube / tube sheet connection by rolling in with groove and / or welding. Crevice corrosion is prevented by applying the inner tubes after the tubes are welded in. Compact sizes and reduced weight. Applications - In case of leakage the application of FRIGOTHERM’s safety shell-and-tube heat exchangers prevents the transfer of pressure and temperature to the other side and avoids other undesirable consequences such as: a chemcial reaction when the media mix together, possible damage to the low pressure side of the heat exchangers, damage to downstream system components from mixed media or increased tempeatures and pressure, hazards for human beings and the environment, the removal, replacement and disposal of mixed media, or downtime due to the need to purchase a replacement or make repairs. The FRIGOTHERM safety shell-and-tube heat exchangers with expanded double pipes are mainly used in the chemical industry, pharmaceutical technology, solar industries, natural gas pre-heating and transformer oil cooling (according to DIN EN 501216-9). Technical design - Safety shell and tube heat exchangers with hydraulically expanded double tubes The new SWF-HE and SWP-HE ranges meet the increasingly stringent requirements for systems based on this safety principle. In double tube systems, the required safety space is created by a pair of tubes - a smooth outer tube and an inner tube with a surface texture which is plastically deformed (expanded) under pressure. Required data for the best shell and tube heat exchanger design ​​State-of-the-art computer selection software is used, enabling the team to supply customers with the optimal model size.  The data required to make the optimal model size selection can be found in the GET A QUOTE section - simply click on SHELL AND TUBE HEAT EXCHANGERS, complete the form electronically and submit it to the FRIGOTHERM team. If you still require further assistance, please do not hesitate to contact us - we will be pleased to assist you. Summary Overview
SWF-HE; fixed tube bundle heat exchangers with two fixed sheets and expansion compensation SWP-HE; tube bundle heat exchangers with removable tube bundle and floating head
AD 2000, EN 13445, ASME VIII Div.I (U-Stamp), TEMA Standard
Steel Stainles steel CuNi materials (Double tubes in material combinations on reques)
Maximum operating pressure -1 / 100 barg (on both sides) Maximum design tempeature -10 / 400 °C (on both sides) (Other options available on request)
MATERIALS   Standard Designs   Shells - Steel 304SS, 316SS, 304LSS,     316LSS up to 42-inch diametre   Bonnets / Channels - Steel, 304SS, 3136SS, 304LSS, 316LSS, Cast Iron, Cast Bronze,   Ductile Iron   Tubesheets - Aluminium Bronze, 90/10 CuNi, Muntz, RNB, 304SS, 316SS, 304LSS,    316LSS Steel   Tubes - Carbon Steel, Stainless Steel, Nickel and Nickel Alloys, Titanium and other Alloys, Bare and Lo-Fin Tubing   CAPABILITIES Tube expansion Seal and strength welding of  tubes to tubesheet Expansion joints (flanged and  flued head as well as bellows  type) Die pen and Helium leak testing Heat transfer test laboratory Radiographic, ultrasonic and magnetic particle testing (sub- contracted)
DESIGN CAPABILITIES   Custom Designs   Materials - Stainless steel(s) (including 300, 400  and 900 series), Titanium, 90/10 CuNi, 70/30 CuNi, Incoloy, Inconel, 254SMO (Note: Weld qualifications may have to be developed)   Diametre -  Up to 22 inches for standard designs Custom designs up to 42 inches   Length - Up to 30 feet for standard steel designs and 21 feet for standard stainless steel designs Custom designs up to 40 feet   Temperature - From -20 °F (-29 °C) up to 655 °F (343 °C) with standard designs Custom designs from -300 °F         (-184 °C) up to 1000°F (538 °C)   Weight - 10 tons maximum   SPECIFICATIONS ASME Section VIII Division 1 TEMA Classes “B”, “C” and “R” API The Pressure Equipment    Directive (97/23/EC) SANS 347
 MODELS OF EFFICIENCY   Customised Shell and Tubes,   OCC and Univex Series Brazed Plate Heat Exchangers Bolted Plate Heat Exchangers FOT Series Air Blast Oil Coolers Air Heaters, Steam Boilers
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