6.3   Water header, tube bundle and shell


The dominant influence in determining the thickness of various parts of a water header for an HP heater for a given pressure on the feed side is the tube bundle diameter, which is governed by the number of tubes needed to provide the flow area for the feedwater.

The following calculations illustrate the design process to find the relevant thickness of the pressure parts which are needed to contain the feed pressures and flows.


      6.3.1  To find tube thickness

      6.3.2  Area required for flow through the tube bundle

      6.3.3  Tubeplate thickness

      6.3.4  Water header wall thickness

      6.3.5  Header branch thickness

      6.3.6  Compensation for openings in the water header

      6.3.7  Shell and dished end thickness


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