Re: [alfa] Re: fuel pump pressures

[bearbvd@xxxxxxxxxxxxxx (Greg Hermann)]

At 6:07 PM 10/26/03, giuliakev@domain.elided wrote:
>I have worked with pumps for 22 years.  I stand by my statement.  Hit the
>books about this rather than trying to use logic.  Kevin

This was replied to off list. Briefly, the books were hit, by me,  more
than hard enough to flatten them long ago !

Would offer a friendly wager, but gentlement don't wager on sure things !!

Greg
>
>
>Absolutely incorrect, Kevin. Any pump, regardless of whether centrifugal or
>positive displacement, will ADD its pressure to the inlet pressure. Only
>way to avoid this would be if the pump incorporates a relief valve on the
>discharge side which is referenced to atmospheric pressure rather than the
>inlet pressure--which is VERY rare !!
>
>A MUCH more important issue for ANY type of pump (fuel, coolant, oil, or
>otherwise !!) is its NPSH (Net Positive Suction Head) requirement at any
>give set of operating conditions !
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