When the brewer is brewing beer with a brewhouse, he may find that the centrifugal pump leaks when the hot wort is in the process of whirlpool. After checking the pump seal, he is confident that the pump seal is in a good condition. Then, how does a centrifugal pump leak during the whirlpool process? Is it a permanent failure of the pump? How could we avoid the leak of the pump?
From the description of the problem, we know that the centrifugal pump leaks only when the wort is in the whirlpool process. So, there’s nothing about the damage of the pump seal. Because once the damage of the pump seal occurs, the centrifugal pump will leak everywhere at any time.
Then, how does a centrifugal pump leak during the whirlpool process? This is most likely due to the vortex caused in the center of the whirlpool tun, and the vortex causes the hot air entering into the centrifugal pump. When this happens, it will not only cause the centrifugal pump to leak, but also produce a large noise.
Obviously, once we could eliminate the vortex in the centre of the whirlpool tun during the wort whirlpool process, the problem of the pump leak will be solved accordingly. So, it is not a permanent failure of the pump.
How could we eliminate the vortex and avoid the leak of the pump? That’s easy! The brewer could use a tool, such as a manual rake, to destroy the vortex in the center of the whirlpool tun. Then, the air will not enter the centrifugal pump. Thus, the pump will not leak any more and the noise will also disappear.
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