Pump

[chrisbjones202]

Hi all

I've been looking at a mag brewing pump. I've seen the two below, while the brewbuilder one looks a little more robust with metal threads I'm just wondering if anyone has good/bad experience of either? At £26 the bridge water brewing one looks a better alternative to a solar being able to restrict flow without needing to regulate voltage.

£48
https://www.brewbuilder.co.uk/ts5-mini-mag-pump.html
(Currently out of stock)

£26
http://www.bridgewaterbrewing.co.uk/sto ... p_12v.html


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[Aaron]

The plastic threads are pretty tough. You'd have to be extremely brutal to damage them.

[chrisbjones202]

My thoughts too, I was just wondering on the pumps in use as there is quite a difference in price


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[HairyJamie]

I have one of each of these and can't see any differences in use, both are perfectly fine. The brewbuilder s/s outlets are shiny but not essential!

[chris2012]

Theres also this pump - http://www.angelhomebrew.co.uk/en/pumps ... ype-2.html which is 17lpm, I'd be curious if anyone's
used that one.

[Eric]

Or here?

[chris2012]

Are you sure that's a magdrive pump Eric?

[Eric]

Are you sure that's a magdrive pump Eric?

No, so I've sent for one.

[chris2012]

Cool! Fingers crossed it is

[orlando]

Are you sure that's a magdrive pump Eric?

It's described as brushless, centrifugal, so probably. I've used the TS 5's and the TD 5's and felt the TS 5's didn't quite have the grunt and were not as robust as the TD 5's. Price difference is worth it in my view. If you go for the smaller ones I wouldn't bother with the SS version unless you are regularly unscrewing and rescrewing on the hoses.

[Kev888]

I've no experience of these specific pumps so will be interested to hear.

Traditionally, magnetic drive meant the motor's shaft was coupled to the impeller by a magnet; the mag coupling can essentially slip whilst the motor shaft continues to rotate, preventing overload when we control the outlet rate with a valve. Some brushless pumps connect the shaft direct to the impeller but the theory is that brushless motors don't suffer the same problems with overload as brushed type, so the shaft can still be slowed mechanically without damage.

Some (such as the solar project/little-brown type) flood the motor's rotor too, which avoids having an inner shaft seal to leak so conceptually they are as good as mag drive pumps and are even occasionally described as such. But I'm yet to be convinced that current practice entirely bears this out, its harder to design the rotor/motor chamber with large clearances for tolerance of particles and easy cleaning, and my experience is that whilst brushless motors are indeed better at surviving overload they still don't like it. Probably all this could be sorted with the right design though, so it'll be interesting to see how things are evolving.

[chris2012]

Ah that's interesting, so brushless motors on centrifugal pumps are more likely to indicate it's magdrive?

[Kev888]

Well in a sense perhaps, 'if designed appropriately' brushless motors can seemingly do away with the need for a separate magnetic coupling since their main motor/rotor mechanism can fulfil both roles at once. I personally think its misleading to term them as mag drive since that already has a specific meaning, but some don't make that distinction.

[chrisbjones202]

Reading the bridgewater website it states " But homebrewing pumps work in a demanding environment;ideally they need a magnetic coupling between the pump head and motor".

I'll give them a call to double check.

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[Eric]

Are you sure that's a magdrive pump Eric?

No, so I've sent for one.

Just got home and found the pump safely delivered. It comes apart in seconds, the plastic top complete with inlet and outlet unscrews with a stainless impeller shaft the length of the body, the external seal being made by a recessed washer. The impeller is attached to a cylindrical (ferrite?) magnet, coaxial with and bearing on the shaft which fits into a journal at the base of the body on assembly. A coaxial female wander socket takes the power.
Not had time to run a test but am rather pleased so far.