Structural steelwork fabricator Frank H Dale Ltd of Leominster was recently employed by Readie Construction Limited to fabricate 175 tonnes of steelwork for an ‘In-Vessel Composting & Anaerobic Digestion Facility’ for TEG Environmental in Dagenham.
Waste recycling plants can be very corrosive environments due to the acids created as materials degrade and the resulting high level of condensation. To protect against this the client specified a hot dip galvanized coating thickness over and above the usual British Standard (BS EN ISO 1461).
All steelwork sections were upgraded to a thickness greater than 6mm and then grit blasted to SA 2.5 prior to galvanizing. Hereford Galvanizers were then asked to galvanize every item to a minimum coating thickness of 140 microns and if, after testing each structural item four times, ANY of the readings were less than 140 microns the section would be rejected and re-galvanized.
In addition to the high coating thickness specifications, the appearance of the galvanized steel was also important with no imperfections or chain marks allowed. All galvanizing had to conform to LMAC testing and impending CE Marking standards. Steve Curl, Operations Director at Frank H Dale said:
“Due to the aggressive nature of the environment we had to use a galvanizer that was confident of achieving the high coating weights. We were very pleased with Hereford Galvanizers. This was a complex job that had so many requirements for coating thickness and aesthetics but it all went very smoothly”.