Double-pipe or multi-tube hairpin heat exchanger

The advantages of using double-pipe or mulli-tube hidipin heat exchamgers uitr 

1 It is a countercurrent flow unit. TempcraEuie crossover is not a problem. 2) suitable for high pressure service, since both she] 1 and tubes are pipes, 3] applicable to fluids with large temperature diffnence withour expansion joint, 4] easy to install, and add on additional units, standant design, usually nor cusiom made. Its delivery time is short, 6) u is easy to maintain - clear, ir. pect, or replace parts. 

1) h is bulky, since tube lengthisusually Dfloc longer, 2) space is needed for removing inner tube or tube bundle  

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Figure 3 A typical double-pipe or multi-tube hairpin heat exchanger, [g)...

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