The Muti-Tube Hairpin Heat Exchanger, also known as multis, take the benefits of both shell and tube heat exchangers and double pipe heat exchangers. It uses a U-tube bundle with separate tubeplates and shells for each of the legs. The return header allows for differential expansion of the bundle and shell and, if required, removal of the tube bundle for inspection, cleaning and maintenance.
As with double pipe heat exchangers, the multi-tube can achieve counter current flow, giving maximum temperature differential and enabling it to accommodate temperature approaches or temperature crosses.
The freedom of the bundle to move independently of the shell removes the need for expansion bellows and allows the unit to accommodate wide or cyclic temperature variations.
Many of the process enhancements found in shell and tube heat exchangers can be incorporated into Multi-Tube units, such as vapour belts, finned tubes, turbulators etc.
While the shell and tube heat exchanger is often described as the "workhorse” of the industrial process industry, the multi-tube heat exchanger builds on the success as an immensely versatile unit, able to handle a wide range of process applications and conditions. Whether you are looking to cool, heat, vaporise or condense, just like the shell and tube the multi-tube can meet your needs.
While we design the headers to meet individual client needs, we group them into four product types.
This is the simplest and most economical case, in the which the bundle is not removable and can be designed with a variety of header arrangements. These units provide all the thermal, cyclic and mechanical advantages of the multi-tube heat exchanger, but without the complex header arrangements.
Advanced gasketed joints are used to allow the headers to be remove and the bundle, complete with tubesheets, to be extracted through the return end.
In cases where it is paramount that cross contamination must not occur, such as bio-pharmaceutical or lethal service, we employ our unique separation headers. Available in both removable and fixed bundle arrangements, they create a physical break between the tube ends and the shell side fluid, so that even in the unlikely event of a tube end or gasket failure, the two fluids are prevented from mixing.
The more information that a client can supply, the closer the design can meet the process requirements. The minimum information required, however, is as follows:
Whether it be NACE spec materials for the Oil Industry or weld overlayed / explosively bonded tubesheets, we manufacture heat exchangers in most combinations of materials.