BM20 Pumped Low Tap

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BM20 Pumped Low Tap

Unread postby mashy » Sun Jan 08, 2017 4:58 pm

A couple of things have led me to this quite significant modification to my original BM 20. Mainly I wanted better handling out of the BM and less lifting. I appreciate this modification will not please everyone, but I am aiming for a brew day nearer five hours and not closer to twenty four :-)

20170108_154730_resized.jpg



This modification will give the following benefits.

1. A low tap so that all of the kettle contents are drained without the need for tipping.
2. Wort aeration (by over pumping). Saving another separate step.
3. Pumping to the fermenter, to speed the process up.
4. Pumping for wash down. You can use the warm water, from chilling recalculated to wash the kettle..
5. Washing water pumped away.
6. Only once the BM is empty & clean to you need to lift it. I personally invert the BM, clean the pump and leave it to drain.
7. I have also added quick fittings to my immersion chiller so that I can use the same hose for the hot exit. Malt Miller state this will not get hot & floppy like routine hose. This serves to clean the hose, be safer & give superior control filling bucket for wash down.

What I did
1. Remove the electrical connections.
2. Remove the pump at the largest kettle fittings. Leaving the two large stainless steel fittings still connected.
3. You may need a vice to remove the pump completely from these fittings; it is connected with sealant.
4. Clean the threads
5. Dry run. Assemble the stainless steel socket > the extension > 3 way valve > 1/2 nipple > quick fitting.
6. To the middle port of the 3- way connect a 15mm compression elbow. Remove the lever and refit the other way up for better clearance & operation.
7. Remount this on to the kettle - finger tight.
8. Refit the pump. NOTE THE DIRECTION of flow - there is an arrow on the body, point it towards the 3-way. Add the straight compression fitting.
9. Now mount this pace finger tight.
10. Tricky bit - slightly bend a piece of 15mm copper tube to fit. Better to bend it long and then cut it down to size. Benders will do an excellent job, but this is only a slight bend, you can do it over your knee.
11. Once everything fits reassemble with sealant / PTFE tape. For the first time I have used sealant. Because I needed the accuracy and the extra grip.
12. Remake electrical connections
13. After 24 hours a thorough hot wash and pump through is required to clean & test.


FAQ ...or "so what about..."

The crud in the bottom?
Sieve it out if it offends you. Or let it pass into the fermenter, it is extra nutrient we will yeast will settle out quite quickly.

What about hop matter?
You could be quite smart and whirlpool, before you insert the immersion. Then leave the immersion in while you are draining thus trapping a lot hop matter. I also use a hop strainer. I have adopted the Mangrove Jack because it has a courser mesh, allowing better proliferation and circulation. This will also be the modified shortly.

What about cleaning the three-way valve?
On your final rinse with some water in the kettle cycle of valve for a couple of times with the pump on, this will make sure everything is flushed out. When you drain make sure the pump is returned to the kettle position (not the pump out position ) . This will help with the draining/drying. It will also ensure you don't get wet feet . Next time you start brewing.

Stiff valve operation ?
The valve I have is quite stiff, so I am taking the precaution of holding the quick fitting, while operating it to reduce the strain on the only two contact points with the kettle. 

Does the pump still come apart easily for cleaning?
Sure does !

List of bits

Quick connectors. These are brilliant, very, very similar to Hose lock connectors, but in the correct thread size.
http://www.ebay.co.uk/itm/151211875740? ... EBIDX%3AIT
100mm Stainless Pipe ..
http://www.ebay.co.uk/itm/231285898988? ... EBIDX%3AIT
1/2 BSP 3 way Valve..
http://www.ebay.co.uk/itm/321733647407? ... EBIDX%3AIT
2m Hose. After much deliberation this is the thickest and the cheapest & easiest. The Malt Miller crew are superb. And .. yes, it is a very very snug fit on the connector.
http://www.themaltmiller.co.uk/index.ph ... ductId=352
Stainless connectors
1 x 15mm stainless steel threaded nipple (AKA male to male)
1 x 15mm (1/2 BSP) stainless socket (AKA female to female)
Compression fittings.
15mm 1 Straight & 1 x elbow & Short length of 15mm tube.
http://www.ebay.co.uk/itm/Chrome-Plated ... ZUHYJLgjEA
Sealant / PTFE
Sealant with PTFE http://delta-adhesives.co.uk/products/i ... oncertina/
Loctite 55 sealing cord is my 'go to' product for ceiling pipe 1 million times better than that white thin PTFE tape. http://supply1.co.uk/loctite-55-pipe-se ... antid=7898


List of useful/associated threads
viewtopic.php?f=4&t=2177&p=20533&hilit=pump+mod#p20533
viewtopic.php?f=4&t=2176&p=20842&hilit=lower+placed#p20842
viewtopic.php?f=8&t=1465&p=20478&hilit=fast+beer#p20478


Latest Updates.....
When you reassemble the pump motor must be higher than the brass body [when BM inverted], else purging air could be a problem. TIP. Pipe sealant helps immensely with positioning. Threads do not need to be all the way in. [See later threads]
Last edited by mashy on Wed Nov 07, 2018 9:32 am, edited 1 time in total.
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Re: BM20 Pumped Low Tap

Unread postby ndindo » Sun Jan 08, 2017 5:43 pm

Wowww!!! Great work!! Could you take a video of brewing processes after this modding?

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Re: BM20 Pumped Low Tap

Unread postby mashy » Mon Jan 09, 2017 6:51 am

That's a good idea.
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Re: BM20 Pumped Low Tap

Unread postby mbarn » Mon Jan 09, 2017 7:36 am

Well done.
I hope it works well for you
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Re: BM20 Pumped Low Tap

Unread postby big_o » Mon Jan 09, 2017 2:21 pm

Amazing work and writeup!!!
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Re: BM20 Pumped Low Tap

Unread postby Mashman » Mon Jan 09, 2017 3:03 pm

Very interesting and I may just be tempted. Just one thought, does the extra elbow and the valve restrict the flow from the pump when mashing?
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Re: BM20 Pumped Low Tap

Unread postby ibbones » Mon Jan 09, 2017 5:54 pm

Ooooooo...I am excited as you are. Good luck and lots of pictures, or a video. :beer:
"BONES"
20 Liter BM
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Re: BM20 Pumped Low Tap

Unread postby mashy » Mon Jan 09, 2017 7:17 pm

Mashman wrote:Very interesting and I may just be tempted. Just one thought, does the extra elbow and the valve restrict the flow from the pump when mashing?


All fittings are full bore. There is a slight restriction in the 3way. But I have not detected any effect.
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Re: BM20 Pumped Low Tap

Unread postby mashy » Tue Jan 10, 2017 2:22 pm

Update.
In short properly chuffed. This mod has taken a while to plan, procure and build. However I think it is really worthwhile.

Good points..
Pumped empty 25l is about 90 seconds [to fully drained]
All fittings have worked as expected - no fails.
Pump over washdown works well and the hose is not too hot to handle.
I might yet fit a sanitary sprayball to the lid and leave the BM to wash it's self !!

Not so good points.
The pump is not a diaphragm pump, so it does not build up pressure, so the aeration 'opportunity' is poor.

Finally I have removed my previously upgraded front tap not sure I see a use for it anymore.
Last edited by mashy on Tue Jan 10, 2017 10:19 pm, edited 1 time in total.
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Re: BM20 Pumped Low Tap

Unread postby Wezzel » Tue Jan 10, 2017 7:22 pm

Well done Mashy. I hope the guys from Speidel are watching this.


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Re: BM20 Pumped Low Tap

Unread postby Tipsy » Wed Jan 11, 2017 12:01 am

Looks a really nice professional mod.
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Re: BM20 Pumped Low Tap

Unread postby BarnBrian » Mon Apr 03, 2017 7:29 am

Hi Mashy, what head height do you think you can achieve with this setup?
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Re: BM20 Pumped Low Tap

Unread postby mashy » Mon Apr 03, 2017 8:00 am

Open flow- at a push, twice the height of the BM.

This is limited by the pump. Its a circ pump not a pressure pump.

Why? What are you thinking? :D

....and you can't say 'whirpooling' I have tried it - a good spoon is quicker.
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Re: BM20 Pumped Low Tap

Unread postby BarnBrian » Mon Apr 03, 2017 9:09 am

Hi Mashy, I've convinced the wife that if I sell our first born child I'll have enough for a 14 gallon SS Chronical, I'll need to pump the wort into it so was wondering if I'd get sufficient height. I'll probably be looking at a height difference from the tap of 600-700mm.
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Re: BM20 Pumped Low Tap

Unread postby mashy » Mon Apr 03, 2017 9:47 am

Yeah I reckon that would work. First born children are overrated IMO.
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