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Old 04-30-2013, 12:22 AM   #291
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For me, it did work but I didn't like the noise the pump was making.
Care to elaborate? I assume you're talking about a PWM.
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Old 04-30-2013, 12:29 AM   #292
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I tried PWM at 680 Hz which worked but the motor whined unpleasantly. I also tried PWM at 20 KHz which didn't work.

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Old 04-30-2013, 02:55 AM   #293
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This is what I ordered for a power supply. Hope it works!

http://www.ebay.com/itm/151013314886...84.m1432.l2649

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Old 05-01-2013, 05:19 PM   #294
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Quote:
Originally Posted by wbyrd01 View Post
This is what I ordered for a power supply. Hope it works!

http://www.ebay.com/itm/151013314886...84.m1432.l2649
Good find, I just ordered one of these too!

Here is a shot of my mlt, and yes the multiple valves look overkill and is a bit over weighted. As you can see for fly sparging the valve is nearly closed to get it to trickle.



I reused a barbed fitting screwed onto a male camlock to make myself a little spray nozzle. The female camlocks tend to be a bit messy with low pressure wort coming out of them.



Overall I am still impressed with these pumps for the money. I did 3 batches over the weekend, 2 10g batches and 1 5g. Big day for 2 people and these were a big help. With the way I have them setup I did however have a heck of a time getting them primed. I'm sure if I had them screwed directly into the ball valve of the vessels they might be a bit easier. I don't really want to do that because I would like to take them off to keep from damaging them when transporting and storing. I think my new plan is to drop them down below with another hose line. I'm hoping that should allow air to exit and liquid to pour down in and get it primed. Most pumps on brew sculptures have the pump down low, so I'll give that a whack. My plan is to make a little power control box so that I can switch them on and off easily.

Nothing is ever finished...
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Old 05-01-2013, 06:46 PM   #295
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I would attach the pump below the vessel using the backplate. You want to avoid stress on the screw threads because poeple have reported that they can snap off.

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Old 05-03-2013, 08:08 AM   #296
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Quote:
Originally Posted by Spellman View Post
Good find, I just ordered one of these too!

...
My pump came in yesterday and that power supply showed up today. For eleven bucks it works pretty well, the voltage adjustment doesn't come down very much though. I'm going to brew on Saturday, I'll take some pictures of my setup and report back on how it goes.
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Old 05-05-2013, 09:10 PM   #297
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another question about these pumps. What kind of tubing is everyone using here and where can it be found. A few places sell the 1/2 variety, but its only rated to about 175f. I was thinking to make it effective and not flow restrictive 3/4 inch hi temp silicone, but I am not sure where to look for this. Any ideas?

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Old 05-05-2013, 10:08 PM   #298
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another question about these pumps. What kind of tubing is everyone using here and where can it be found. A few places sell the 1/2 variety, but its only rated to about 175f. I was thinking to make it effective and not flow restrictive 3/4 inch hi temp silicone, but I am not sure where to look for this. Any ideas?
Get some high-temp silicone tubing from BargainFittings.com (or another vendor that is active here). It's nice, and pretty cheap.
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Old 05-05-2013, 10:18 PM   #299
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So I just got my tan P38i pump this week and hooked it up for a practice run today. I powered it at 12v using a homemade power supply I built from an old computer PSU. Here are some quantitative data for those that care:

At basically zero head (just a few inches from the height of the kettle volume to the lip of the bucket into which I was pumping) I averaged 42.67 seconds per gallon over 3 gallons, or 1.4 gallons per minute.

At 4' head, starting only with the pump at ground level and the output at full height (primed to just a few inches above the pump) it had trouble even getting any flow. It would move the water, but it was just at a trickle. BUT. . . .

When I started the pump from ground level with the output at a low height, then raised it once the flow was going, I got a kind of siphon effect that kept drawing as the hose was raised up to 48" where I then positioned it and started timing. I was able to maintain a good flow after this. Through this method, I got 68.36 seconds per gallon, or 0.88 gallons per minute. Still a decent flow, though I don't know how one would practically get this sort of "pumped siphon" action going.

As a cheap pump for a single-tier system, this thing still seems to be a fine choice.

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Old 05-05-2013, 10:21 PM   #300
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I thought of that also, but the the inside diamater that they sell on barginfittings might not fit on my black pump with a 3/4 inch (or near to there) OD. I am using the proflow dynamics cam locks. How do you squeeze 1/2 inch tubing onto a 3/4 inch OD? Or maybe just get larger tubing?

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