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Old 12-28-2007, 12:47 PM   #1
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Default Pumping Question

I got my hands on a March 7.2 GPM Hi Temp. pump. What are the flow considerations when pumping from MT to kettle or recirculating? Can I use a direct connection to MLT spigot or should I use a grant? Wondering if that flow rate would negatively impact the grain bed.

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KD


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Old 12-28-2007, 12:53 PM   #2
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The only thing I've noticed is that when the volume gets low in the MLT, the wort drains a little slower to the pickup tube. If I pump at full flow, the siphon will break earlier than if I'm throttling the flow. While recirculating, I haven't had any problems pumping at full flow.

Your filtering method may also play a role in how fast you're able to pump. I use a keg with a false bottom. A short braid, for example, may not allow enough flow to go wide open.


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Old 12-28-2007, 01:01 PM   #3
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Quote:
Originally Posted by Lil' Sparky
The only thing I've noticed is that when the volume gets low in the MLT, the wort drains a little slower to the pickup tube. If I pump at full flow, the siphon will break earlier than if I'm throttling the flow. While recirculating, I haven't had any problems pumping at full flow.

Your filtering method may also play a role in how fast you're able to pump. I use a keg with a false bottom. For example, a short braid may not allow enough flow for the full rate.
Thank you for your reply. I am using a copper manifold that I just made, so I am not sure how well it works. How does one throttle back the flow? Does it affect the pump in any way?

Thanks again.
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Old 12-28-2007, 01:27 PM   #4
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For magnetic pumps, I've always heard it's best to throttle the flow with a valve on the outlet of the pump. They're not supposed to run dry, and if there's too much pressure, the magnetic drive just slips. I don't think it causes any damage to the pump.
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Old 12-28-2007, 01:29 PM   #5
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BTW, what model did you get? Most of us use a 809HS, which is rated at 5.3 GPM.
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Old 12-28-2007, 02:27 PM   #6
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Quote:
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BTW, what model did you get? Most of us use a 809HS, which is rated at 5.3 GPM.
Yep, that's the one I have too. It says 7.2 gpm on the box, and Northern Brewer has this on their site.

March 809 Magnetic Impeller Pump

A high-quality, inexpensive wort pump. This 1/25 horsepower magnetic drive seal-less pump has a polysulfone head, rated for food grade use up to 250 F. It has a maximum flow rate of 7.2 gallons per minute, and a maximum head of 12.1 feet. The head has 1/2" MPT inlets and outlets. The motor housing is not drip-proof, so you should locate the pump in a dry location.

We stock two models, a pre-wired model with a six foot cord and a three-prong 110 V plug, and a model with a three foot electrical lead that should be wired into a 110 volt AC switch (not included).
#40184 March 809HS-PL Pump - 6 foot power cord and plug $135.99
EACH BUY
#7351 March 809HS-PL Pump - 3 foot wire leads (no plug) $117.99
EACH BUY
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Old 12-28-2007, 02:50 PM   #7
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Well, that's the one you want. Just different sources on the flow rates, I guess. This is where I got the 5.3 GPM. Whatever it is, it's just about right for homebrew purposes.
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Old 12-28-2007, 02:58 PM   #8
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Interesting.

Well, I'm off to fire up the strike water for the no-sparge experiment.
I'll post efficiency in no-sparge thread later.
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Old 12-29-2007, 01:20 AM   #9
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Quote:
Originally Posted by Lil' Sparky
The only thing I've noticed is that when the volume gets low in the MLT, the wort drains a little slower to the pickup tube. If I pump at full flow, the siphon will break earlier than if I'm throttling the flow. While recirculating, I haven't had any problems pumping at full flow.

Your filtering method may also play a role in how fast you're able to pump. I use a keg with a false bottom. A short braid, for example, may not allow enough flow to go wide open.
Yep, had to work towards the end. Ned to tweak technique.


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