Process Equipment Update
accurate and quick, but came with a lot of complex parts such as stainless steel pipes, pistons, three-way valves and air diaphragms. These all cause certain issues when it comes to cleaning, for example creating opportunities for yeast, bacteria and mould to thrive. The regular and long-winded cleaning regime this
required, including hot water and steam, proved unacceptable from a productivity point of view.
ability to adjust other parameters at the simple touch of a button.
Importantly the company is also achieving a much better
dissolved oxygen result than before. Oxygen is the ‘enemy’ of wine, and volumetric fillers can occasionally churn the product, creating bubbles, which in turn leads to rejects. Watson Marlow Pumps has also had success at Thames
Water’s advanced water treatment works (AWTW) in Walton, Surrey, where engineering, consulting and construction company Black & Veatch opted to install a number of 520 series and 620 series peristaltic models. .
Quick release functionality Offering continuous, high-pressure and quick release functionality, the new pumps have slotted comfortably into their high-tech surroundings at Walton, which is one of Thames Water’s flagship process plants. Several processes reliant on pumping operations are vital
to the advanced water treatment process at Walton. For instance, pre-ozonated water is mixed with a coagulant in the flocculators to aid the production of large flocs, which are floated more easily in the subsequent CoCoDAFF (counter- current dissolved air flotation and filtration) process. The addition of coagulant is today facilitated by newly installed 620 series pumps from Watson-Marlow. Historically this site has had close association with peristaltic pumping technology. “While the previous 504 series pumps for the coagulant
So after working with Watson-Marlow, Wine Innovations decided to acquire Flexicon PD22I industrial peristaltic machines in combination with Flexicon MC12P OEM control units. The Flexicon PD22I is a table-top unit that requires no
cleaning validation. It also facilitates easy and rapid product change-over (less than 60 seconds) and provides no potential for cross-contamination, hence providing the perfect solution to the problems faced by Wine Innovations.
Ease of installation There are other benefits, too, including ease of installation, the equipment’s accuracy (±0.5 per cent) and speed, its adjustable acceleration and deceleration capability, plus the
process were reaching the end of their natural life, they had performed well so it was decided to continue with this type of pump,” explains Black & Veatch’s project M&E co-ordinator at the Walton site. Watson-Marlow 620 series close-coupled pumps are pumping inorganic polymer coagulants such as ferric sulphate, which perform well with thick flocs and offers fast sedimentation. The water is then treated using CoCoDAFF and passes
through post-ozone and granular activated carbon (GAC) contactors, as well as slow sand filters before arriving at the disinfection stage, where sodium hypochlorite is introduced to contact tanks in doses using 520 series Watson-Marlow pumps.
Multi-channel peristaltic pumps A
ccuStaltic multi-channel peristaltic pumps from Ledebuhr Industries are reliable pumps that simply squeeze the liquid out of a flexible tube, with precision rollers, in a continuous or cyclic rotary motion The fluid only contacts the inside of the resilient tubing. AccuStaltic pumps are specifically designed to use multiple tubes simultaneously.
The pumps range from 4-12 individual flow channels which can be combined with different manifolds and tubing to create flows from single continuous flows up to 180l/min to 12 accurately
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metered individual flows of as little as 0.5ml/ cycle.
In terms of accuracy, AccuStaltic pumps work at ± 5 per cent of average flow over their speed range and the life of the tube for most tubes. The design keeps older, swollen tubes from pinching and rubbing, for longer tube life. Double-sealed, synthetic-lubed bearings are impervious to contamination. All parts are stainless steel or coated to resist all but the strongest alkali solutions.
Serviceability is simplified with four bolts or fewer needed to remove any component – and
all parts are available individually off-the-shelf. In addition, hoses can be inspected without a total pump disassembly, making for easy routine maintenance. The pumps are also readily rebuildable, at the fraction of a cost of a new pump, often within an hour. Ledebuhr has included a wide range of turnkey drive options, for example fixed speed, a sensorless variable-speed AC, hydraulic, and mechanical link. The company says the new pumps can handle pressures over 70psi, with the proper tubes, with minimal effect on flow rate. ■
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