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Shell & Tube Heat Exchangers
The advantages of moving the structure to the inner tube are :
• Contact area between inner and outer tube of a double tube increased by up to 80 %;
• Optimized 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 prevented by applying the inner tubes after tubes are welded in ;
• Compact sizes and reduced weight .
Safety shell & tube ( SWF-HE ).
About the author
David Knightbridge worked for Funke as an agent for 6 years and then an employee for over 30 years as UK Sales Manager , looking after shell & tube , plate type and industrial air blast coolers . Apprentice trained and finally being registered as and Incorporated Engineer with the Engineering Council . Soon to retire and hand over to Shane Bowland- Kenyon , the new UK Sales Manager for Funke . For more information on Funke products , please visit www . funke . de , or contact David Knightbridge directly at david @ funke-uk . com
Design features :
• Media separated by double tube bundles , media cannot mix ;
• Special sealing liquid for immediate leak indication ;
• Leakage system works independently of the installation position ;
• Leakage detection is possible through process control ;
• Suitable for a wide range of liquid media .
From this , Funke has gone on to develop a new generation of safety heat exchangers . A structured inner tube is hydraulically expanded to a smooth outer tube and the gap created between the tubes is charged with a vacuum for leak detection . The hydraulic expansion gives maximum contact between the two tubes and ensures optimum heat transfer characteristics .
Specialties and advantages In conventional technical solutions with double tubes , the outer tube has a relatively rough structure on its interior . FUNKE , however , shifts the structure to the outside of the inner tube and uses a finer structure in a pyramid shape .
two simultaneously embossed plates are laser-welded at the port holes welding line
plate 1 ( 0.35 mm ) plate 2 ( 0.35 mm ) Safety plate heat exchangers with double-wall design – FDPW .
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 .
Applications In case of leakage the application of FUNKE safety shell-and-tube heat exchangers prevents from transferring pressure and temperature to the other side and avoids other undesirable consequences such as :
• A chemical 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 temperatures and pressure ;
• Hazards for human beings and the environment ;
• Removing , replacing and disposing of mixed media ;
• Downtime due to the need of purchase a replacement or make repairs ;
The Funke 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 ). The safety technology has also been developed in the company ’ s plate type heat exchanger range with a series of double wall plates . More information can be found at www . funke . de .
1 pair of plates ( welded 2 x 0.35 mm ) turned by 180
1 pair of plates ( welded 2 x 0.35 mm )
1 pair of plates ( welded 2 x 0.35 mm ) turned by 180 www . heat-exchanger-world . com Heat Exchanger World September 2024
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