Coldbreak Brewing Giveaway - Open to All!

Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > March pump losing prime when running pump wide open
Reply
 
Thread Tools
Old 09-04-2011, 07:31 PM   #11
chuggerpumps
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2010
Location: NJ, NJ
Posts: 266
Liked 18 Times on 15 Posts
Likes Given: 9

Default

The pump needs to have back pressure on the discharge to properly operate. The larger hose is giving no back pressure..use a valve on the discharge


chuggerpumps is offline
 
Reply With Quote
Old 09-04-2011, 10:02 PM   #12
emjay
HBT_SUPPORTER.png
Feedback Score: 1 reviews
Recipes 
 
Join Date: Jan 2011
Location: Toronto, Ontario
Posts: 12,712
Liked 1716 Times on 1604 Posts
Likes Given: 1

Default

Quote:
Originally Posted by WalterAtMarchPump
the pump is designed to be used with 1/2" line...by going larger you are allowing the pump to try and exceed its rated flow rates because there is less resistance on the outlet side. That puts a larger stress load on the mag drive and you could de-couple it.
Or....you could have a slightly less then normal magnetized impeller......when they run the magnetizer here they check every 10th or so piece. Most times they are way stronger then what we require...but every so often we do get a weak one come out. If you want to send it to me I can test it for torque. If not then just use 1/2" line and you probably will never have any problems.

-Walter
Ah... is that why some of the pump heads have a 3/4" inlet but all of them have a 1/2" outlet?
emjay is offline
 
Reply With Quote
Old 09-05-2011, 01:42 AM   #13
beaksnbeer
HBT_LIFETIMESUPPORTER.png
Feedback Score: 1 reviews
 
beaksnbeer's Avatar
Recipes 
 
Join Date: May 2011
Location: New Port Richey, Florida
Posts: 2,831
Liked 494 Times on 328 Posts
Likes Given: 67

Default

Quote:
Originally Posted by emjay View Post
Ah... is that why some of the pump heads have a 3/4" inlet but all of them have a 1/2" outlet?
Yes input to a pump needs to be greater then the output or it cavacates, basicly the impeller spins faster the the liquid drawn into it. So either a 3/4 dip tube or restrict/valve down the output, I would go with a larger dip tube then put the pump at risk.........my.02
beaksnbeer is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
MArch 809 Problem - Losing Prime Cape Brewing Equipment/Sanitation 18 06-23-2011 09:18 PM
Dual purpose March Pump as a Rain Barrel Pump nanotigerbrewer Equipment/Sanitation 6 12-01-2010 08:18 PM
March Pump losing prime shoebag22 Equipment/Sanitation 28 07-20-2010 12:23 PM
March pump wont pump high temperatures. above 190... rshosted Equipment/Sanitation 17 07-12-2010 09:05 PM
March Pump Prime awest74 Equipment/Sanitation 3 07-09-2007 05:05 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS