What is a wort grant?
A Grant is a small wort collection vessel in beer equipment or brewery equipment system , open to the air, placed between the lautering vessel and the wort kettle.
The traditional purpose of a grant was threefold:
(a) to avoid a potential vacuum in the lauter or mash/lauter tun during wort pumping for recirculation or filling the kettle, which could seal the mash to the false bottom, thus causing turbid worts or stuck mashes;
(b) to allow the brewer to asses wort clarity and wort flow;
(c) in larger systems with multiple lauter tun outlets, to determine whether all parts of the grain bed flow sufficiently well or require raking or other measures to improve flow-through.
(d) The grant thus serves as a flow buffer. In old tower-style breweries, where brewing vessels are stacked one on top of the other and wort flow is by gravity only, there is, of course, no need for a grant as a vacuum break, but its other uses remain valid.
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