high heat kills my march pump...ideas on a fix?

[WalterAtMarchPump]

Do you have a curve showing magnetic loss vs temp for your magnets? I bet cavitation is part of the problem but it also seems like the magnets are going somewhat slack as you can hear a tone deviation that sounds to me like decoupling at higher temperatures. Either way, it's a phenomenon I don't like. Luckily it's not a huge problem for me as I only recirc boil for 15 minutes to sanitize my plate chiller. Once I'm in whirlpool, the heat is off and it's not a problem.

I don't have a curve to post up, but i copied this our magnet supplier once gave us a while back:

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Up to about 840F, changes in magnetization are largely reversible, while changes between 840F and 1800 F are re-magnetizable. For all Ferrite magnets, the degradation of magnetic properties is essentially linear with temperature. At 350 F, about 75% of room temperature magnetization is retained, and at 550 F, about 50% is retained.
****************

There's allot of factors that come into play with pumps and magnets when dealing with heat situations:
how thick is the fluid?
how much restriction is on the inlet side of the pump?
what size line is on the inlet/out of pump?
head height it has to pump up to?
RPM of motor?

 

[runningweird]

All I really want to do is recirculate boiling wort through my plate chiller to sanitize it, and as far as the bubbles in the line go I doubt that is the issue - I use an electric element a good distance from where the pickup tube is located.

Walter at march reached out this morning to help me diagnose the issue as well, he offered to send some replacement parts but I had just put the pump in the mail to chugger. Nice to see that these companies do really care about their products and their customers.

Will update as more info becomes available.

 

[runningweird]

Just got an email from Mike, along with a video of the pump working while pumping boiling water - Based on customer service alone, again for something bought secondhand, I will not hesitate to try one of their new pumps when I expand my brew setup.

http://www.youtube.com/watch?v=YaPYpycwEck&feature=youtu.be

Fantastic, Can't wait to get it back and brew something, or perhaps I will use it to sous vide some spare ribs....so many possibilities.

 

[scubakevdm]

Sweet. Did he say which parts he changed?

 

[runningweird]

Got the pump back in the mail today, it is currently pumping away while the kettle reaches boil temps. I just sent an email to Mike asking what parts he replaced, it looks like there is a new head on the unit. I will post back when I hear from him and after the pump pushes boiling water for a while.

 

[CidahMastah]

Got the pump back in the mail today, it is currently pumping away while the kettle reaches boil temps. I just sent an email to Mike asking what parts he replaced, it looks like there is a new head on the unit. I will post back when I hear from him and after the pump pushes boiling water for a while.

Cool - I have yet to try the pump I was sent, but will let people know if it remedies the problems. Would like to know the replaced parts as well for future reference.

 

[runningweird]

nothing back from Mike at Chugger yet, but the pump just pumped boiled water at a great rate for almost an hour. I think chugger fixed the problem - it looks like the head had to be replaced but I am not quite sure.

So the problem is FIXED!

 

[chuggerpumps]

I did not have time to troubleshoot this particular pump but I Know Ian said he had a Mach Pump and then bought an original model Chugger Head second hand from someone. So I was uncertain of what happened with this pump. Glad I could help

nothing back from Mike at Chugger yet, but the pump just pumped boiled water at a great rate for almost an hour. I think chugger fixed the problem - it looks like the head had to be replaced but I am not quite sure.

So the problem is FIXED!