Based on the results gained from the first SPX25 pump, the Anheuser-Busch Inbev UK Magor Brewery in Monmouthshire, South Wales has installed a total of six peristaltic hose pumps on site.
Kieselguhr, a sedimentary rock/mineral is used by brewers in the beer filtration process. A pump is deployed to dose kieselguhr in slurry form into the filter so that it forms a 'bed' on a plate and frame filter.
Piston pumps used in this process deliver unreliable results and also introduce dissolved oxygen (DO) into the beer.
According to Paul Evans, Technical Services line manager at the Anheuser-Busch Inbev Magor Brewery, DO even in trace quantities in beer can change its flavour, making it taste stale.
He says that it is critical for the brewery to monitor the ingress of DO into their beers and keep it down to levels of less than 10ppb (parts per billion).
However the corrosive nature of the kieselguhr slurry causes the stainless steel non-return valves on the discharge side of piston pumps to stick. Consequently, the pumps need to be maintained or replaced, exposing the beer to the atmosphere.
With three filter mains on site at the Magor Brewery, Inbev decided to trial an SPX25 peristaltic pump supplied by Watson-Marlow.
Peristaltic pumps have no valves, seals or glands and the fluid contacts only the bore of the hose or tube, eliminating the risk of the pump contaminating the fluid or vice versa.
Extensive trials were completed successfully at the Magor Brewery and two more pumps were installed for the other filter mains.
The pumps are linked via an inverter to the brewery’s PLC using a Scada interface so that the speed can be controlled as required.
Evans says that they also find the running signal to be extremely useful so that when they come anywhere close to the 2,000 hours recommended by Watson-Marlow, the hose can be changed as part of a planned and preventative maintenance schedule.
Key features of the SPX25 peristaltic hose pumps:
- Rugged hub with twin-bearing rotor combines the advantages of bare-shaft construction with those of a close-coupled pump
- Pump bearings absorb the forces occurring in the pump centrally, placing no load on the gearbox bearings
- No coupling, alignment or heavy-duty base plate required
- Lower installation time, less maintenance and reduced costs
The Anheuser-Busch Inbev Magor Brewery has since acquired three additional SPX25 peristaltic pumps for use on a similar application in a different operation.