8.5   Heater tube length and tube supports


The procedure used is again similar to that already described for HP heaters. However, for LP heaters, this usually only involves consideration of a condensing section.

If integral drain coolers were to be used, the procedure would be the same as that used for HP heater drains coolers. An average U-tube length between tubeplates on an LP heater for a modern 660 MW unit is about 18 m, giving an average tube bundle length of 9 m.

      8.5.1  Tube support plates


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