Throttling pumps
Felix Kersting <[email protected]> Fri, 10 Aug 2007 23:00:53 -0700
| Newsgroups | gmane.org.clubs.gobiodiesel.mixmasters |
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| Message-ID | <[email protected]> |
This is a multi-part message in MIME format. --===============1965421259== Content-Type: multipart/alternative; boundary="------------090708050202050501000806" This is a multi-part message in MIME format. --------------090708050202050501000806 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit BRIAN: please review as a board member - Zac suggested: In the future, use the valve on the inlet side of the pump to throttle flow, NOT the valve on the outlet side. It is possible that the pump was working too hard against the back valve and burned out that way. I'm not sure, though. Please ignore this advice. Always throttle the outlet side of centrifugal pumps, not the inlet. Throttling the inlet can cause cavitation, especially if the tank is pumped dry. All the blue Harbor Freight pumps are centrifugal pumps. (wash totes and processors). I believe that the pump was full of junk ( the shaft would not move). I will install an inlet strainer on the #2 wash tote and retro on the #1 as time permits. Note that we have lost sprinkler heads into the tote and to my knowledge have not fished them out..... I will also install better throttling valves on the outlet side of the pumps when I am on-site this Saturday. I will pick up a hose and wye fitting allowing us to keep the water pressure on full time to our water heater. If anyone knows where to get solid brass sprinkler heads, please call me to discuss - I can give you the specs. Felix --------------090708050202050501000806 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> BRIAN: please review as a board member - <br> <br> Zac suggested:<br> <pre wrap="">In the future, use the valve on the inlet side of the pump to throttle flow, NOT the valve on the outlet side. It is possible that the pump was working too hard against the back valve and burned out that way. I'm not sure, though.</pre> <big>Please ignore this advice. Always throttle the outlet side of centrifugal pumps, not the inlet. Throttling the inlet can cause cavitation, especially if the tank is pumped dry. All the blue Harbor Freight pumps are centrifugal pumps. (wash totes and processors).</big><br> <br> I believe that the pump was full of junk ( the shaft would not move). I will install an inlet strainer on the #2 wash tote and retro on the #1 as time permits. Note that we have lost sprinkler heads into the tote and to my knowledge have not fished them out.....<br> <br> I will also install better throttling valves on the outlet side of the pumps when I am on-site this Saturday. <br> <br> I will pick up a hose and wye fitting allowing us to keep the water pressure on full time to our water heater.<br> <br> If anyone knows where to get solid brass sprinkler heads, please call me to discuss - I can give you the specs.<br> <br> <br> Felix<br> </body> </html> --------------090708050202050501000806-- --===============1965421259== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ mixmasters mailing list [email protected] http://lists.gobiodiesel.org/mailman/listinfo/mixmasters --===============1965421259==--