View Full Version : Reccomendation for Yeast pump 30 to 100 bbl tanks

07-29-2014, 09:05 PM
After researching here and elsewhere I've not been able to discover the best options and variables on a yeast pump. Please help.
Yeast pump function to include pumping yeast from fermenter to brink, dosing yeast from tank bottom to knock out line injection fitting, dosing yeast from brink to KO, plus other functions.
What are the advantages and disadvantages of double diaphragm, peristaltic, rotary lobe, and other pumps?
Using 30 to 100 bbl tanks.
And Cheers

08-01-2014, 08:57 AM
What pumps are best for collecting yeast into a brink, metering yeast from a brink or tank bottom into a brew?

brewmaster 2011
08-01-2014, 10:22 AM
I have always pushed yeast with CO2. Seams like using a pump would beat up the yeast.

08-01-2014, 12:45 PM
In a small brewery CO2 pumping makes sense, but what happens when the tanks are bigger? A thick yeast slurry at the bottom of the tank can get pretty thick requiring a lot of pressure to move it through the 1.5" fittings on the 60 bbl tank (not sure how much of a difference the 2" valves will make on the 100 bbl tanks).
Pumping 10 or 20 psi into a the headspace of a big tank will take a lot of CO2, the tank is probably only rated to 15 psi. After the yeast transfer the head pressure has to be released potentially causing the turbulence inside the tank and wasting a quantity of CO2.
A special pump is needed....

08-01-2014, 02:17 PM
I would use a diaphragm pump for yeast.
-Self suction
-Even thick slurry yeast easy to pump
-through the pulse of the pump yeast in the cone will move downwards and you get a pretty clean cut between yeast and beer
-easy to adjust the speed via air pressure

08-02-2014, 10:05 AM
Thanks for the suggestion. Do you think a double would be better than a single diaphragm?
What do you think of peristaltic pumps? I like the cleanability of the peristaltic.

dick murton
08-06-2014, 12:31 AM
I have used diaphragm, lobe, gear and peristaltic pumps for yeast. My preferred option is to use peristaltic pumps, if necessary with a variable speed drive to control the pump rate. Hygiene is the main reason, though they are more reliable than air diaphragm pumps in particular, and seem to be less prone to cavitation than lobe or gear pumps.

With thick CO2 saturated yeast, none of these pumps will be truly PD, but they will where there is no entrained gas.

Whichever one you use, remember these are positive displacement pumps and need a pressure relief by-pass round them to prevent overpressure and damage. And when cleaning, open the by-pass route so that you can get turbulent flow through the rest of the pipework, thus cleaning properly. Run the pump at maximum speed, which will never be enough to create turbulent flow in the main pipework, but will allow the pump to be cleaned as best it can. This is a real advantage of peristaltics - as the flexing of the hose during cleaning means there is good physical cleaning action of the hose, with only short sections of non turbulent flow at the inlet and outlet between the bypass connections.

08-07-2014, 09:13 AM
I think an AODD pump is a good choice and you don't need a pressure relief bypass on them so you save money there. Get a good sanitary one so you can clean it properly.


As another choice what about a flexible impeller pump? Good suction, easy to clean and fairly gentle on the product. Just get a slightly bigger one and run it slow.

09-03-2014, 09:21 PM
After studying possibilities of a yeast pump, it looks like we'll be going with a peristaltic pump instead of a diaphragm pump. I am a little nervous about pumping yeast 65 feet through a 1" hose (or maybe 1.5"). If the peristaltic pump does not work ... sure it will. The peristaltic pump has a variable speed drive built in so I can simply dial in flow rates once the system is zeroed in. The noise and pulsation of the diaphragm pump made it look like a less attractive option. The possibility of using the peristaltic pump to blend and stir yeast in a brink made the peristaltic option standout. Mixers for brinks are deadly expensive.

I am sure they are both good choices. Both types of pumps are expensive. Peristaltic pump hose is very expensive!

Looked at used models also.

I want to thank Tony at CPE and others for their help.

Call Martin over at Verder pumps, 800.832.4562. He set us up with a great new pump.

I will try to leave some feedback after the system is up and running.

09-04-2014, 04:07 AM
Besides not needing air, which in turn requires a compressor and an air line, peristaltics are much quieter. Besides, you can use them to dose finings, juice, or whatever to beer over a prescribed time. Or set them to run a short while and have them remove a specified amount of yeast before you start collection for repitch. Peristaltics are really useful for all sorts of things.