8.4.2   Flow area

 

The calculation to find the flow area is the same as that described in the
section on HP heaters. The maximum velocity used in the tubes depends upon
the manufacturer's practice but usually does not exceed 1.8 m/s.

For a 660 MW unit, a typical LP heater has about 1000 U-tubes with a tube bundle diameter of about 1.4 m.

 

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