2 minute read
Eradicate yeast handling issues
with these pumping solutions
Certa Sine pumps from Watson-Marlow Fluid Technology Group (WMFTG) have replaced rotary lobe pumps at the family-owned Hofmann brewery located in Germany. The new technology will eliminate gassing issues while boosting pump efficiency.
In the brewing process, once fermentation is complete, the yeast is recovered (or harvested) for reuse. The challenge is that much of this yeast settles at the bottom of the fermentation tank where it can set into compacted bulk so pumps with high suction capabilities are required to draw the solid yeast from the tank.
GAS LOCKING
Yeast naturally forms bubbles during fermentation and can cause gassing-off (gas locking) issues for the pumps used to harvest it. Gas locking had serious and ongoing effects for the lobe pumps at the Hofmann brewery, including a reduction in flow rate. This effect was particularly noticeable due to the need for long suction lines between multiple yeast tanks and the pump station.
FACT BOX
WMFTG is a wholly owned subsidiary of Spirax-Sarco Engineering plc which has strategically located manufacturing plants around the world and employs over 7 800 people, of whom 1 800 are direct sales and service engineers. Its shares have been listed on the London Stock Exchange since 1959 (symbol: SPX) and it is a constituent of the FTSE 100 and the FTSE4Good indices.
To overcome these challenges, Hofmann invited WMFTG to assess the application and make its recommendations. Several stipulations were involved, including the requirement to handle various yeast viscosities, the need for self-priming, and no gas locking. With these thoughts in mind, Hofmann was advised to adopt a MasoSine Certa 200 series pump.
Certa offers both high suction capability and high flow. This performance level is consistent even with different yeast strains/ viscosities and pipework runs and even compacted yeast is easily drawn from the fermentation vessel.
CONTROLLED PROCESS
Certa pumping technology is virtually pulsefree, providing consistent flows despite varying product and system conditions, thus facilitating controlled yeast transfer. Due to the continuous and smooth pumping action, the pump draws the yeast from the bottom of the tank and avoids any turbulence that would cause the beer to mix with the settled yeast. This clarity enables the brew master to immediately recognise when the yeast removal process is complete and can stop the pump before losing beer.
A further advantage of Certa technology is low-shear pumping. The presence of high shear can lead to poor quality beer, as well as
The new Certa Sine pump at Hoffman Brewery high yeast usage and costs – issues avoided with the use of this technology.
It was a combination of these factors that prompted Hofmann to install Certa 200 pumps, which duly led to successful and continuous yeast harvesting. The brew master has since stated that ease of maintenance by the brewery’s personnel, and rapid CIP cleaning, are added advantages. Here, the simplicity of the Certa pumps reduces CIP cycles and the amount of water and cleaning agents required. •
