Citation
(1998), "Anti-corrosion coating for waste incineration plant", Anti-Corrosion Methods and Materials, Vol. 45 No. 1. https://doi.org/10.1108/acmm.1998.12845aab.007
Publisher
:Emerald Group Publishing Limited
Copyright © 1998, MCB UP Limited
Anti-corrosion coating for waste incineration plant
Methods
Anti-corrosion coating for waste incineration plant
Cleanaway Ltd, one of the UK's leading industrial and commercial waste disposal companies, operates Britain's largest waste disposal and incineration plant at Ellesmere Port. It handles a wide range of chemicals, solvents, oils, etc.
The gases of combustion from the controlled incineration plant pass through an extensive filtering system as part of the process to meet all environmental control requirements. Over a period of time this led to deterioration of the coating on the ducting housing the fabric filters. Cleanaway Ltd selected Repair Protection & Maintenance Ltd (RPM) of Pontefract, West Yorkshire, to carry out the repairs to the ducting coating.
RPM, a new company in corrosion engineering but with considerable experience of the specialist coating industry, then visited Archco-Rigidon, a Winn & Coales subsidiary, for advice on the most suitable coating for this demanding application. RFM says it selected Archco-Rigidon because of its reputation for quality anti-corrosion coatings and its technical back-up.
The material RPM selected for the repairs was Archco-Rigidon 423D, a spray applied glass flake filled vinyl ester resin coating. This coating has a proven track record in such corrosive environments and was compatible with the existing coating.
The grit blasting operation in the fabric filter duction, which is some 85 feet above ground level, revealed a number of holes in the roof which had been caused by under lagging corrosion. These were repaired utilising a glass fibre membrane and a Archco-Rigidon compatible vinyl ester lamination resin.
Matting patches were used to bridge the holes with a further larger mat deployed to strengthen the surrounding thinned area.
Cleanaway were aware that additional repair work would be necessary, and as the shutdown progressed RPM were asked to quote for the internal lining of two clarifier tanks, each approximately 100m2 in area. Again, a competitive price and an assurance that this work could be accommodated within the shutdown time frame secured the contract for RPM.
The clarifier tanks were of a bolted panel construction which had previously had problems with seepage at the joints. This had been temporarily resolved by the application of a 300mm wide band of mastic sealer over the panel joints. As part of the coating procedure the mastic was to be removed and replaced with a glass fibre bandage which would be applied between the main spray coats of Archco-Rigidon 423D, which was considered the most appropriate coating for this work. An intermediate stripe coat was applied over the glass fibre matted joints.
Applying a spray coat of
Archco-Rigidon 423D as part of the internal lining system for one of the
Cleanaway clarifier tanks
Other inspections on site revealed defects in the existing coating in a number of areas, including the inlet and outlet ducts on the fabric filter, the mist eliminator duct and two sections of the stack inlet pipe. In some areas the existing coating was removed completely and recoated, whilst a sweep blast and top coat was all that was required in others. Despite the fact that this additional work increased the original repair contract ten fold, all the work was completed within the shut down time frame.
Further details are available from Archco-Rigidon Ltd, Denso House, Chapel Road, London SE27 0TR. Tel: 0181 761 6244; Fax: 0181 761 2456.