Occasionally at the very end of fermentation I get yeast blowing out top into my blow off bucket. It always leaves me scratching my head. Does anyone know why this might happen?
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Yeast blown out blow off arm.
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It may not be top cropping, but invariably top cropping yeasts form a head before it collapses almost completely (far more than a top cropping yeast), in some cases completely.
This simply suggests your vessels are slightly too small for the volumes you are brewing. Even for bottom cropping yeasts, it is generally considered necessary to have 20 to 25 % over capacity - but I always remind people that the critical factor is the vertical height between the top of the wort and anything that might result in yeast overflowing, rather than a simple percentage. Which I admit is easier said than done if starting a new brewery, with no experience of how the yeast behaves under the required fermentation conditions with that particular brew volume and vessel dimensions.
Try using antifoam of some sort to reduce the yeast head depth.dick
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