Heat exchangers and the bolting of gaskets

Bolt tensioning is now the preferred method of tightening bolts and studs on all critical applications. Bolt tensioners are designed for use on a wide range of applications including pipeline flanges, pressure vessels, compressor covers, boiler feed pumps and heat exchangers to name a few.

Shell and Tube, Air Cooled and the Plate-Type heat exchangers are the three most commonly used types of exchangers in the chemical and process industry. With an increasing effort in recent years to reduce both the weight and size of exchangers whilst increasing efficiency, other types of exchangers are frequently being used.

Gasketed plate heat exchangers use high quality gaskets to seal and clamp together plates and protect against leaks. The gasketed plates are assembled in a pack, mounted on upper and lower guide rails, and compressed between two end frames by compression bolts.

The gasket arrangement of each plate distributes the hot and cold media in a counter-flow arrangement into alternating flow channels through the plate pack. These heat exchangers are simple and relatively cheap to maintain since the plates can easily be removed to allow maintenance procedures to be carried out.

Heat transfer equipment may be selected for its type or for the function that it performs such as chiller, condenser, cooler reboiler, whereas the choice of a Shell and Tube type exchanger is determined primarily by factors such as the need for the provision for differential movement between shell and tubes, the design pressure, the design temperature, and the fouling nature of the fluids rather than the function.

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