RE: Air Bound Centrifugal Pump

From: <Steve>
Date: Thu May 19 2005 - 03:44:00 EDT

Hi Thomas
Thanks for the thanks. Any time.

Cheers

Steve

-----Original Message-----
From: PipingDesign@yahoogroups.com [mailto:PipingDesign@yahoogroups.com] On Behalf Of Thomas Laupa
Sent: Thursday, May 19, 2005 3:24 PM
To: PipingDesign@yahoogroups.com
Subject: RE: [PipingDesign] Air Bound Centrifugal Pump

Steve:

thank you for your good help. we've bled a little water from the discharge
back to the suction. it did the trick.

THANK YOU! At 03:56 PM 5/3/2005 +1200, you wrote:
>Hi Thomas
>
>if the pump is normally flooded suction, then a small (say 10mm) pipe
>extending into the impeller eye and running up to the height of the
>suction tank + say 0.5m sometimes helps. Sometimes bleeding a little
>water from the discharge back to the suction will also do the trick. A
>really large suction line sloping down into the pump suction will also
>help shovel water into the pump while letting air bubble back up the
>suction line. There are automatic air bleed valves which will do the
>trick if you can find a suitable installation point ; Apco, MaidOMist,
>Amiad etc; google "air eliminators". However they are float operated
>and if you put them onto the pump casing they can stay full of water
>even when the impeller eye is air bound.
>If you don't need a check valve on the discharge line, then simply
>stopping the pump and starting it again may do the job.
>
>Cheers
>
>Steve
>
>-----Original Message-----
>From: PipingDesign@yahoogroups.com
>[mailto:PipingDesign@yahoogroups.com]
>On Behalf Of Thomas Laupa
>Sent: Tuesday, May 03, 2005 1:23 PM
>To: PipingDesign@yahoogroups.com
>Subject: [PipingDesign] Air Bound Centrifugal Pump
>
>
>Ladies & Gents:
>
>just installed a small centrifugal pump in water service. the purpose
>of this pump is to move water from one elevated basin to another. the
>pump is
>below the first basin and pumps up about 4 feet in the second.
>
>from time to time the pump becomes air bound and stops pumping. this
>may be due to vortexing, i'm not sure. or perhaps the lower basin is
>running
>dry. however, the problem is that to get the pump moving water again i
>must bleed the air off the pump.
>
>is there an automated way to bleed the air? or is there another means
>of keeping the pump working?
>
>thank you in advance for your help.
>
>
>
>
>
>
>
>Thomas G Laupa PE
>Senior Engineer - Nalco Company
>Office Address: 1601 Diehl Road, Naperville, IL, 60563 Courier
>Address: 1003 Remington, Fort Collins, CO, 80524 970-227-5127
>800-493-5009 fax
>
>
>
>
>=========================================
>PipingOffice - Excel Spreadsheets for Piping Calculations
>http://www.pipingoffice.us/ =========================================
>Main site: http://www.pipingdesign.com
>
>Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
>=========================================
>PipingOffice - Excel Spreadsheets for Piping Calculations
>http://www.pipingoffice.us/ =========================================
>Main site: http://www.pipingdesign.com
>
>Yahoo! Groups Links
>
>
>
>

Thomas G Laupa PE
Senior Engineer - Nalco Company
Office Address: 1601 Diehl Road, Naperville, IL, 60563 Courier Address: 1003 Remington, Fort Collins, CO, 80524 970-227-5127 800-493-5009 fax

---

PipingOffice - Excel Spreadsheets for Piping Calculations

http://www.pipingoffice.us/ =========================================

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

Yahoo! Groups Links Received on Thu May 19 03:44:00 2005