Re: flow issues with transfer pump

Hey Mike,

Every time I have that problem, yesterday in fact, it has been caused by air
being sucked in where my hose is connected to the barb fitting on my HLT.
The heat softens the hose and it leaks. Probably at 125* it wouldn't soften
enough. Even though the tiny bubbles are barely noticable, they will build
up in the pump head and stop the flow. I have found that if I run the pump
recirculating into the HLT and the retighten the hose clamp on the barb
until the bubbles disappear, this will solve my problem. To purge any air
that has gotten in the line, I drop the output hose into a bucket on the
floor and run the pump for a couple of seconds. Can't do that though with
it hard plumbed.

I solved the hose kinking problem with a bungee cord, about a foot above the
output of the pump, that prevents the hose from laying over.

Cavitation should not be a problem as long as you have the proper flow to
the input side of the pump. The instructions with my March mag drive pump
say to throttle the flow on the output side.

Hope this helps.

Bill


<mikehoyt@xxxxxxxxx> wrote in message
news:1123440133.047233.202170@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> I've bought a magnetic drive transfer pump. i want to use it to move
> my 170F sparg water from the boil tank to a 10gallon gott cooler that
> is sitting up nice and high. I've got mixed resullts with the thing.
> when it goes bad the flow starts out great but slowly and steadily
> fizzles out until nothing comes out. (the height of the sparg water
> tank is well within the 12' height the pump should be able to handle).
> i was using temp resistant tubing orignally but it was still softening
> and ultimately kinking which I was sure was the blame. So to combat
> this I plumbed up a great copper pipe solution to get the water up to
> the tank. testing it with 125F water seemed to work great. Today I
> pumped 180F water and the flow issue returned!
>
> Is there a tendancy for 170F+ water to cavitate and create a vapor lock
> in the line somewhere and essentially de-prime the pump? Anybody have
> experience with this and is there any quick and simple remedy?
>
> thanks!
>
> Mike
>

.

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