Introduction of DP in Lauter tun and the solutions to control it
DP is the pressure difference between beneath the false bottom and upper, as measured by a gauge, and what the pressure would be, and showing if the grain bed offered no restriction to the flow of wort.
You can see that there are two gauges attached to the lauter tun: gauge #1 measures pressure below the screen, gauge # 2 above. Unlike my hypothetical example, neither is attached to the bottom; however, this does not matter. Both gauges are calibrated in inches of water column. By necessity, gauge # 2 is higher than gauge #1, and this must be corrected for. So, at zero DP, the pressure reading of gauge # 1 is equal to the reading of gauge #2, plus the height difference between them. Say for example we are running off first wort. Gauge # 2 reads 6 inches, gauge #1 reads 9 inches, and we know that #2 is 4 inches higher on the lauter tun wall. So, at zero DP gauge #1 would read 10 inches. If it reads 9, DP is one inch.
Negative pressure caused in Lauter tun during wort laturing will bring disastrous collapsing.
In a modern brewery, brewers invent many special facility to help to inspect and control the DP
well.
1.Level Balance Pipe
A one square inch water column, 27.7 inches high, weighs one pound and exerts a pressure of one PSI. It is wrong expressing the differential pressure in PSI. That is not how it is usually done. DP is commonly stated as inches or millimeters of water column. So 0.64 PSI works out to about 17.7 inches, and our differential pressure is 10 inches. This is a crisis. The rule of thumb in commercial breweries is that 1 to 2 inches is optimal, 4 is fine, and 6 is okay. When you get to 8 it's past time to drop the rakes and start backing down the flow rate. As a matter of fact, I start lowering the rakes when the DP hits 3 inches. At 10 we're talking remedial measures -- stop the runoff, do a deep cut with the rakes, maybe underlet to lift the bed.
Typically used in micro brewery 200L-2000L.
Position of its top should not be over the bottom of Lauer tun
Automatic Level sensor can be placed inside the SUS wort grant.
While no level sensors inside the transparent glass one.
3.Horizontal SUS Wort Grant with inspection window
Typically used in micro brewery 200L-2000L.
4.Level Balance Column
Typically used in 2000L and larger breweries.
Placed position should be based on the altitude of screen (false bottom).
5.Pressure Difference Transmitter
Pressure sensors are fitted and feed back data to the system's PLC/control computer.
Typically used in large commercial and full-automatic breweries.
Edited by Kevin
Email: brewing@cnbrewery.com
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