When using a thumper keg in a setup with a 15-gallon milk can, it is important to consider the filling level of the thumper keg to ensure optimal performance and efficiency. In this case, you mentioned that the thumper keg is filled about half way with the same mash as in the main vessel.
At the start-up of the heating process, pressure is generated within the system, which can cause the contents of the thumper keg to be expelled. This can result in the thumper keg being left approximately 1/4 full.
To address this issue and avoid excessive expulsion of the mash from the thumper keg, there are a few factors to consider. Firstly, it is important to ensure that the thumper keg is properly sealed and securely attached to the main vessel. Any leaks or loose connections can contribute to the expulsion of the contents.
Additionally, the filling level of the thumper keg can play a role in determining the amount of mash that is expelled. If the thumper keg is filled too high, it can lead to increased pressure build-up and subsequent expulsion. On the other hand, if the thumper keg is filled too low, it may not effectively contribute to the distillation process.
To find the optimal filling level for your thumper keg, it is recommended to experiment and make adjustments based on your specific setup. Start by filling the thumper keg about halfway, as you mentioned. Monitor the pressure and observe how much mash is expelled during the heating process.
If you find that a significant amount of mash is being expelled, you can try reducing the filling level of the thumper keg slightly to see if it helps alleviate the issue. Conversely, if the thumper keg is not contributing enough to the distillation process, you can increase the filling level slightly.
It is important to note that the exact filling level may vary depending on various factors such as the heating rate, mash composition, and equipment design. Therefore, it is essential to closely monitor the system during operation and make adjustments as needed to achieve the desired results.
The filling level of a thumper keg in a setup with a 15-gallon milk can should be determined through experimentation and observation. Start by filling the thumper keg about halfway and adjust accordingly based on the pressure build-up and expulsion of mash during the heating process. Remember to ensure proper sealing and attachment of the thumper keg to avoid leaks and maximize efficiency in your distillation setup.