RE: Water Hammer Analysis.

From: <Erik>
Date: Tue Mar 01 2005 - 11:00:00 EST

You are required to input curves which describe the behaviour of the head and torque characteristics over the full possible range of operating conditions. During a transient analysis the pump the pump may move from positive head,positive flow, positive speed behaviour to a number of other possible conditions :

     Normal puming:Reverse Turbine
     Running against reverse flow
     Normal Turbine/Reverse pumping (High Ns)
     Running backwards against flow/Reverse Pumping (Low Ns)

It is most unlikely that you will know the characteristics in the mode of operation, other than positive head,positive flow,positive speed. You have to enter your pump data as "four quadrant" pump curves, also known as Suter curves.The curves tend to have similar shapes for the same specific speeds.
If such curves are not available, the curves must be extended by comparison with data for other specific speeds. This is an uncertain procedure, and the results of transient analysis using such data must be viewed with skepticism.

The suter curve is a second, non dimensional representation of a pump curve, that has undergone a transformation so that both curves (forward & reverse rotations) are represented by one single line.

For more information on pump behaviour, you are advised to read the relevant sections from the following: Fluid Transients in systems, Wylie & Streeter, Published by Pentice Hall 1993, ISBN 0-13-322173-3.

Erik.

---

Van: Rajesh.Balapure@ril.com [mailto:Rajesh.Balapure@ril.com] Verzonden: dinsdag 1 maart 2005 14:03
Aan: pipingdesign@yahoogroups.com
Onderwerp: [PipingDesign] Water Hammer Analysis.

Dear Group Members,

For Water Hammer Analysis ,what do we understand by Reverse Flow & Reverse Rotation of Pumps?.
How is this Analysis done for this Reverse Flow?.

Regards,
Rajesh V Balapure

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

---

PipingOffice - Excel Spreadsheets for Piping Calculations http://www.pipingoffice.us/

---

Main site: http://www.pipingdesign.com

Yahoo! Groups Sponsor

ADVERTISEMENT
<http://us.ard.yahoo.com/SIG=129qg6tm8/M=298184.6018725.7038619.3001176/D=gr
oups/S=1705083319:HM/EXP=1109768762/A=2593423/R=0/SIG=11el9gslf/*http://www. netflix.com/Default?mqso=60190075> click here

<http://us.adserver.yahoo.com/l?M=298184.6018725.7038619.3001176/D=groups/S=
:HM/A=2593423/rand=929109149>

---

Yahoo! Groups Links

• To visit your group on the web, go to: http://groups.yahoo.com/group/PipingDesign/
• To unsubscribe from this group, send an email to: PipingDesign-unsubscribe@yahoogroups.com
  <mailto:PipingDesign-unsubscribe@yahoogroups.com?subject=Unsubscribe>
  
• Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
  <http://docs.yahoo.com/info/terms/> .
  

[Non-text portions of this message have been removed] Received on Tue Mar 01 11:00:00 2005