The Reason Of Lower Tank Pressure In Secondary Fermentation

In the secondary fermentation process, the pressure in the tank is an important technical parameter.

It can directly affect the carbon dioxide content and foam quality of the beer. Generally speaking, after 3 days of secondary fermentation, the tank pressure can reach 0.04~0.05Mpa. 5 days later, the tank pressure can reach 0.05~0.08Mpa, which is the standard technical pressure. But sometimes after a few days, the tank pressure is still lower than 0.03Mpa. the reasons are as follows.

1. There are air leaks at the tank mouth, valves and pipe joints.
2. Too much carbon dioxide loss due to late sealing time.
3. Low residual sugar due to poor temperature and sugar level control when transferring from fermentation tank to beer tank.
4. The primary fermentation is not vigorous and the amount of yeast is low (3~5)x10^6 cfu/ml.
5. Too much space left due to too little beer.
   The two-body, three-use vessel allows for 2 key technical points.
6. lautering is achieved naturally. the boiling process is achieved by gravity. When releasing the pulp, part of the impurities will fall down the vortex tank, so it will not destroy the false bottom. Also, not too many solid impurities will enter the boiling process.
7. Realize refilling of waste grain with hot water
   The refilling of waste grain with hot water can achieve higher sugar concentration. At the same time, it also reduces the waste of energy.

Operation. Wort naturally cascades into the whirlpool tank under the effect of gravity. At this time, the wort pump is in the resting stage. When we need to refill the spent grain, we can transfer the hot water (heated in advance) from the kettle chamber to the fermenter through the wort pump. After finishing the waste grain refilling, the remaining hot water in the kettle is drained and the pulled wort is transferred to the kettle tank for boiling.

The CIP system has many advantages, but also has some drawbacks as follows.

Due to the possible cleaning problem of the CIP system itself, it can easily become a secondary source of contamination and affect the fermentation process.

There is a potential threat to the sterilization of fermentation and maturation.

2) Due to the use of lye as a detergent, we must sterilize the CO2 before cleaning the fermentation tanks and bright beer tanks. This will waste a lot of CO2 and increase the consumption of lye, so the cost is high. At the same time, the residual lye and CO2 will react and cause the content to change, and the effect is difficult to control.

3) The cleaning time is long and the consumption of water and electricity is high.

4）It is cleaned without pressure. When in use, there is a certain amount of air in the tank, and there is a risk of oxidation and contamination of the beer.

5) Due to the negative pressure of the pump, it is easy to make changes in the structure of the tank.

6) Due to the consumption of a large amount of detergent and water, it will lead to a high pressure of sewage treatment.