Hello,
The critical time can be estimated by using the
following:
t=(2xL)/C
L - Pipe length --> 100,000 m
C - Wave velocity in pipe ~ 1000 m/sec
t= 200 sec.
To prevent water hammer you have to close or open valve slower then 200 sec. (more then 3 min).
>
>
> Hi all
>
>
>
> I have a project for water handling, a pipeline
> with 100 km length, I am studying about surge in it
> according to a probable rapture in pipe and I am
> going to close two valves surrounding rapture point
> to avoid wasting water and to find out about surge
> cause by closing valves.
>
> Any body has experience in this regards? How shall
> we protect our system?
>
> I have heard from Erhard valve, they recommend a
> valve called "pipe burst control valve" to avoid
> wasting water when there is a rapture, this valve
> will be closed in around 2 min and this will cause
> surge in system, in some point we have -2 bar
> minimum pressure. I know that you may need to know
> about the profile but generally I would like to know
> how shall we suppress this surge?
>
>
>
> Best regards
>
>
>
> Omid
>
>
>
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