RE: [PipingDesign] Joukowski Wafer NRV installation - Daniel Literature quote

From: <Erik>
Date: Sat Nov 27 2004 - 10:54:00 EST

A hydraulic retarder can perfectly be used in liquid flow pipelines without any risc of waterhammer.
Backflow is not absolutely forbidden and is not harmful for the proces of the pumping installation.

Swing check Valves should not be used without an hydraulic dampener in liquid flow because of their dynamic characteristic.

I can easaly proof that with some graphs. The graphs are the rusults of some measurments of the closing behaviour of a hydraulic dampened check valve of a pumping station of a cooling tower.

Please let me know if you want to have those graphs,

Erik

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Van: Sajit Viswan [mailto:sxviswan@yahoo.co.uk] Verzonden: vrijdag 26 november 2004 19:47 Aan: PipingDesign@yahoogroups.com
Onderwerp: RE: [PipingDesign] Joukowski Wafer NRV installation - Daniel Literature quote

This is quote from the Daniel Swing Check Valve technical literature, see page 3, available as a PDF file at their website address.

Retarder - The hydraulic retarder is normally used in gas flow application where the flow rate fluctuates and can allow the clapper to close frequently during normal operation. The retarder stabilizes clapper movement. A retarder should not be used in liquid flow pipelines because it may allow the commencement of reverse flow and the resultant "water hammer".

Sajit

PS, Is there a way in Outlook to set the replies, not to include the original message for the replies that I send to pipingdesign.com. The general settng in options applies it all the replies that I make.

[Non-text portions of this message have been removed]

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[Non-text portions of this message have been removed] Received on Sat Nov 27 10:54:00 2004