Dear Erik
Thank you for your reply,
As I have mentioned it is a one way surge tank and so, I have modeled a swing check valve to prevent tank from draining back when pump is off.
As you mentioned Surge tank prevents a fluid column separation and rejoining but I have modeled a one way surge tank which is different as you know.
My concern is about this column separation, I suppose to locate an air valve (twin air valve from Erhard) to allow this air will be released, but I still want to know your opinion, do you think it is ok if air will enter to system after water has been finished in one way surge tank? Actually I have found that I need a huge amount of 800 cu meter to prevent air entering to system but it is impractical, I have decided to allow air enter to system after water has been finished in a smaller one way surge tank and locate an air valve to allow air released in re-starting.
Best regards
Omid
> What are the boundery conditions ?
> Is there a receiver at a height over 33ft above the
> level of the tank from
> which the water is drawn?
> Is there a valve a the end of the pipeline who
> closes to prevent the tank
> from draining back when the pump is off?
>
> A surge tank prevents a fluid column separation and
> rejoining.
>
> When air enters the pipe and the pump is restarted,
> the column of water will
> be accelerated into a partial empty pipe. Given a
> long anough void, the
> column of water can accelerate to its terminal
> velocity of perhaps 5 to 10
> fps before striking the valve face.
> Upon collision with the valve, the kinetic energy of
> motion is converted
> into potential energy by compressing the liquid.
>
> There should always be water in the surgetank.
>
>
>
>
>
> _____
>
> Van: Omid Hamlehdar [mailto:omid_7_ae@yahoo.com]
> Verzonden: maandag 6 december 2004 11:51
> Aan: <a href="/group/PipingDesign/post?postID=-xasnc7PyhroDVwdqqgHUA8BAfEit9FfHVYGLQl_j4uzf3BdznFskZmvoFTZfwbOoKanXRqQSqSVQLjEN9-862F2">PipingDesign@yahoogroups.com</a>
> Onderwerp: [PipingDesign] Surge Tank
>
>
> Hi everybody
>
> I have a question and will be pleasure to have your
> opinion.
>
> After analysis a pipe line for water transfer
> purpose,
> I found that I have extreme down surge, to suppress
> this surge I assumed a one way surge tank, my
> question:
>
> 1. Is it ok if air will enter in pipe line
> after water
> has finished in one way surge tank?
> 2. In terms of restarting (priming) the line,
> if air
> has entered to system, is there any consideration
> required regarding probable impact regarding column
> separation in line?
>
> Your contribution is highly appreciated
>
> Omid
>
>
>
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