My experience indicates that the primary culprit in
water hammer shaking piping around (leading to failure
perhaps) are the unblanced pressure forces in any
given elbow pair... the pressure wave causes a suddne
spike in pressure on one end of the elbow piar that
creates an unbalnced pressure thrust which is not
present during steady state.
Best Regards Mit Freundlichen,
John C. Luf
Have Calculator will travel...
Piping Engineer, Pipe Flex, Water Hammer, member B31.3
Somewhere in the U.S.A.
>
> Glad to see your blood is pumping. The thing that
> makes pipelines shake
> around is poor design, not momentum.
> Oddly enough, I have never found a particularly good
> book on the
> subject. Lots of learned tomes which make my eyes go
> out of focus. But
> never a ripping yarn on the subject. Cant think why.
> For an intro,
> "Water Hammer" by Webb, Gould et al (NSW Uni Press)
> is as good as any,
> in my humble opinion.
> Your last sentence implies that anchoring slip fit
> bends may be a good
> idea. But Chris tells me the speed has not changed,
> then there is no
> change in energy, so no harm can be done. Its all
> soooo confusing.
> I agree "The momentum of the fluid if change as the
> velocity is changed"
> I do not agree "The energy of the fluid if change as
> the velocity is
> changed"
> But I know we all know what we mean and we are all
> correct, so I view
> this as an entertaining exchange of pleasantries
> rather than a learning
> exercise.
> Which we have to do with Australians nowadays since
> they are currently
> crap at anything requiring a ball.
>
> Cheers
>
> Steve
This archive was generated by hypermail 2.1.8 : Tue Mar 04 2008 - 11:40:45 EST