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Whirlpool "Strength"

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--- Quote from: blatz on January 25, 2013, 11:38:29 AM ---perhaps I need to stop pumping and let it rest longer (I did about 5 min last time).  do you think the increased pressure would cause a 'better' cone to form if I were to bypass the chillers during the whirlpool?
--- End quote ---

I would definitely rest longer. I recently started waiting 15 min because 10 wasn't enough.

I think you'll be fine leaving the chillers in the loop, and you probably want them there for sanitation reasons anyway. I have a similar setup (one 25 ft CFC, non-high flow 809) and I'm happy with the results I get running the pump wide open for 15 min, then resting 15 min.

Jimmy K:
The fact that the cone forms during the rest afterwards tells me that pumping strength is not much of an issue. The trub is settling out when the wort is moving slowly. In fact, I'd guess too much flow will keep particles suspended. I stir with a large spoon for a couple minutes and let it rest for ~15. 

cool - i will try a longer rest next time.  thanks fellas.

I think you are much better off with a short whirlpool and a longer rest. If you are getting things moving around in a circle, that is pretty much all you need. Things don't start to settle down to the bottom until you stop the pump.

The steepness of the coned material in the center of the kettle is dependent upon the 'shear strength' of the material.  In the case of the ground hop matter in pelletized hops, the shear strength is nearly zero since that cone is composed of hydrated proteins and vegetative materials.  Essentially, its goose crap. 

If you use whole hops, then the cone can take on more shape because there is mechanical, 'particle to particle' contact between the individual hop cones.  That mechanical contact increases the shear strength of the mass and allows it to 'cone' better.  One of my old brewing buddies pointed out that a good technique for improving the coning of the hops and trub was to include at least a small proportion of whole or plug hops in the hop bill to provide that strength to hold the cone together.  I prefer pellet hops, but using 100% pellets hops will leave you with a 'flatter' cone nearly every time.


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