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  1. katmar

    critical zone friction factor

    For Re between 2000 and 4000 the flow is unstable and there actually is no definite friction factor. Churchill's equation does give unique values in this range, which makes computer solutions feasible but you should avoid this zone in practice. See the FAQ by quark in this regard faq378-1236...
  2. katmar

    Reboiler Steam Flow Control

    All the reboilers I have worked with have had the flow control valve in the steam line feeding the reboiler, and a steam trap in the condensate exit line. However, I recently saw a P&ID which showed the flow control valve in the condensate line, but with the flow element still in the steam...

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