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Process Industry News -
Solids Handling and Processing
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Friday, 03 July 2009 10:42 |
 When South West Water required bespoke silo systems at two water treatment works, it immediately contacted the UK’s leading bulk storage and handling specialist, Portasilo.
At Stithians water treatment works in Cornwall, Portasilo was tasked with upgrading an existing powdered activation carbon (PAC) storage, handling and mixing system and they were also briefed to provide assistance in replacing mixing tanks for the existing lime handling system at Prewley water treatment plant in Devon. In both instances working in conjunction with Tecker, the appointed specialist process engineering contractor.
Ross Mitchell, South West Water’s Technical Support Engineer, said: “All of these systems needed to be upgraded and reconfigured and as we have always received excellent service and the best quality silo systems from Portasilo they were our first choice supplier. We also have an agreement with Portasilo for the maintenance and upgrading of all our treatment plants.”
With the current system offering insufficient capacity and the mixing tanks corroding, Portasilo undertook a detailed inspection of the Stithians plant which is used to control the taste, colour and odour associated with algae in potable water and was tasked with providing a new lime storage and handling system to meet future capacity requirements on site.
This tailor-made system had to comply with ATEX 95 regulations due to the potentially explosive nature of PAC, and in addition Portasilo applied a paint finish in accordance with Water Industry Mechanical and Electrical Specifications (WIMES).
Delivering controlled quantities of PAC into two slurry mixing tanks manufactured by Portasilo, the system installed contained twin wedge outlets that discharge into metering screw conveyors.
Crucially, Portasilo ensured against the accumulation of damp PAC when the screws are not in use by fitting a pneumatically actuated isolating valve at the point where the screws discharge into the mixing tanks.
At Prewley, Portasilo were also tasked with working in a restrictive area to provide two new bespoke mixing tanks and volumetric feeders, plus access platforms and stairways for the tanks. Portasilo devised a solution to manufacture the tanks in two halves at its factory and deliver the pieces to site for assembly by the Tecker team.
For more information contact;
Portasilo Ltd, York,
Tel: 01904 624872 Fax: 01904 611 760
E-mail:
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Web: www.portasilo.co.uk
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