CW60 Cask Washer

Microdat’s range of cask washers begins with a CW30 which was designed as a starter unit and as a modular unit such that a small brewery could commence with a single CW30 and add a second or third as the brewery grew. However market demand, for a larger unit, means Microdat have developed a CW60.

This machine is similar to the 2 x CW30’s except it is manufactured as a single unit and thus provides a more economical option to 2 x CW30’s.

The CW60 has also several improvements added, making it a very desirable machine for the quality brewer.

Like all Microdat cask washers from the CW30 to our latest CW340 installed at large UK breweries, it washes and sanitises using the same tried and tested principles.  The principles used on all Microdat cask washers are based upon a powerful physical clean of the cask by powerful water jets from a purposely designed, very robust self-rotating wash nozzle. This unique product has taken 20 years to perfect as a cask washing nozzle as it only uses 35 litre/min at 6 bar washing pressure.

The cleaning process begins with a pre-wash which uses recovered final rinse water from the previous casks washed. This reduces the water consumption, effluent discharge and energy used considerably. In addition, the hot recovered final rinse liquor also provides heat to the detergent tank to reduce the energy used to heat the detergent, which is normally maintained at a working temperature of 60 to 65 degs C.

The pre-washing operation blasts water internally into the cask to physically scour the cask’s internal wall in all areas.  This is something which can never be effectively achieved by a manual pressure washing system. As the pre-wash liquor uses recovered final hot rinse liquor, there will be some detergent residue and the liquor will be hot at around 70 to 80 degs C after a few washes. This operation effectively flushes and physically cleans the cask whilst pre-heating it. The pre-heating prevents the detergent liquor from being significantly cooled and starts the process of elevating the cask’s internal temperature to sanitise the cask.

The detergent system is a closed loop hot detergent system with an inbuilt process heater which can be electric, or via an internal heating coil supplied with either steam or hot water from the Microdat cask washing hot water tank.  The detergent tank can either be topped with detergent manually or dosed semi automatically.

The final hot rinse is a key aspect of Microdat’s washing philosophy and literally pasteurises the cask’s internal surfaces, ensuring that there are no beer spoiling organisms left within the cask. The above method of cask washing has been employed effectively for many years in both large and small breweries and has proven to be effective at preparing a reusable cask for new real ale. The only addition you may wish to consider is having a final steaming operation which was common in a lot of breweries in the past when energy was relatively cheap, however injecting steam into an open vessel does not improve the temperature of the cask’s internal surface significantly when compared to the 85 to 90 degs hot water used in the final rinse. It does however cost a lot of money to inject steam into each cask and unless the steam is clean and filtered it can even contaminate a previously cleaned and sanitised cask.

 

The CW60 Construction

The CW60 uses stainless steel and some high specification modern plastics. It is built for the job and to last. Microdat cask washers built in the early 1990’s are still in use today delivering clean sanitised casks.

A key feature of the Microdat small cask washer is its unique peristaltic Microdat design and built pump unit. When recycling washing liquor to pre-wash and detergent wash, there will always be some fine partials (particles?) which can pass through the fine screens on the machine.  With a peristaltic pump, specially designed to provide pulsed cask washing, you get a reliable and efficient pump delivering 6 to 7 bar pressure.

The control system on a CW60 is similar to the higher specification range of Microdat washers and fillers, using a touch screen HMI-Plc to provide the operator interface and machine control. Like all Microdat cask machines, it monitors its own performance and will only complete its washing operation when it meets with its minimum set parameters. If the washer does not reach a minimum of 80 degs C during washing, it will hold the process and alarm waiting for the temperature to rise to its minimum set point.  When you wash a cask on a Microdat CW cask washer you can be assured it will not spoil the next fill of your precious, hand crafted, quality real ale.

 

Key Feature of the CW60

  • Very robust and long life machine to last for 20 years plus, thus a high resale or trade in value if you grow.  Microdat will always assist a customer in upgrading a Microdat machine to a higher production rate.
  • Finance readily available for purchase or rental (subject to status).
  • Very energy and effluent efficient, using around 6 to 10 litres of new water per wash.
  • Effective filtration of the effluent and debris to prevent drain blockage.
  • A well tried and tested washing operation relying on a powerful physical clean, detergent, and a final effective high temperature (80 Deg C min) sanitisation wash to destroy most organisms which can spoil cask ale.
  • All Microdat cask washing machines use the same tried and tested system from 30 casks to 340 casks per hour.
  • Fully safe in operation, the cask must be present on the wash nozzle and there are no finger trap points and safety hazards.
  • Fully self-monitoring the washer must go through its whole cycle with the correct parameters to complete a wash.