Chapter 6: DFT/FFT Transforms and Applications 6.1 DFT and its
Repairing Spillway Gates · • Polyglass VEF applied at 1000µm dft. • Polyglass 100 Zipcoat...
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Case study: Corrocoat protects spillway gates Corrosion protection for australian spillway gates. Client Water industry, Australia. Application date 1995 & 2004. Scope of work Replace original coal tar epoxy coating. Products Upstream submerged areas: Polyglass VEF. Downstream submerged areas: Polyglass Zipcoat. Rubbing areas: Plasmet HTE. Normal atmospheric exposure areas: Plasmet ZF. Substrate Mild steel & cast iron fabrication. Application method • Grit blast to ISO 8501-1 cleanliness std SA 3 • Polyglass VEF applied at 1000μm dft. • Polyglass 100 Zipcoat applied at 1000μm dft. • Plasmet HTE applied at 2000μm dft. • Plasmet ZF applied at 400μm dft. Coating credentials • Access to the gates is difficult and expensive being 80 metres above the river bed, so long term corrosion protection is highly desirable for this asset with a required life of 200 years. • Despite the use of established coatings and reputable painting contractors, early coating breakdown was recorded in the first couple of years of the gate re-painting program. • Corrocoat Engineering Victoria offered a 10 year warranty with an expected life of 30 years. • In 1995, Corrocoat was requested to refurbish three gates as a result of a life cycle cost-benefit comparison exercise, between a combination of Corrocoat systems and other lower cost epoxy resin systems. Corrocoat was awarded the work for 3 gates, and it was carried out successfully, in the middle of winter, with the gates being put back into operation on time. • Inspections in 2004 have revealed that whilst further deterioration of the epoxy resin / coal tar epoxy coated gates is evident, no such deterioration of the three gates coated using Corrocoat’s system was noted by the delighted customer, with the equipment remaining in excellent condition. Photographs Left: The spillway gates at Glenmaggie. Access to the gates was the first hurdle for Corrocoat. Middle: One of the spillway gates after coating – note the complex geometries. Right: Visual inspection of one of the gates after service – showing no coating breakdown. Corrocoat Ltd, Forster Street, Leeds LS10 1PW Tel +44 (0) 113 276 0760 Fax +44 (0) 113 276 0700 www.corrocoat.com
Transcript of Repairing Spillway Gates · • Polyglass VEF applied at 1000µm dft. • Polyglass 100 Zipcoat...
Case study: Corrocoat protects spillway gates
Corrosion protection for australian spillway gates.
ClientWater industry, Australia.
Application date1995 & 2004.
Scope of workReplace original coal tar epoxy coating.
ProductsUpstream submerged areas: Polyglass VEF.Downstream submerged areas: Polyglass Zipcoat.Rubbing areas: Plasmet HTE.Normal atmospheric exposure areas: Plasmet ZF.
SubstrateMild steel & cast iron fabrication.
Application method• Grit blast to ISO 8501-1 cleanliness std SA 3• Polyglass VEF applied at 1000µm dft.• Polyglass 100 Zipcoat applied at 1000µm dft.• Plasmet HTE applied at 2000µm dft.• Plasmet ZF applied at 400µm dft.
Coating credentials• Access to the gates is difficult and expensive being
80 metres above the river bed, so long term corrosion protection is highly desirable for this asset with a required life of 200 years.
• Despite the use of established coatings and reputablepainting contractors, early coating breakdown was recorded in the first couple of years of the gate re-painting program.
• Corrocoat Engineering Victoria offered a 10 year warranty with an expected life of 30 years.
• In 1995, Corrocoat was requested to refurbish three gates as a result of a life cycle cost-benefit comparison exercise, between a combination of Corrocoat systems and other lower cost epoxy resin systems. Corrocoat was awarded the work for 3 gates, and it was carried out successfully, in the middle of winter, with the gates being put back into operation on time.
• Inspections in 2004 have revealed that whilst further deterioration of the epoxy resin / coal tar epoxy coated gates is evident, no such deterioration of the three gates coated using Corrocoat’s system was noted by the delighted customer, with the equipment remaining in excellent condition.
PhotographsLeft: The spillway gates at Glenmaggie. Access to thegates was the first hurdle for Corrocoat.Middle: One of the spillway gates after coating – note the complex geometries.Right: Visual inspection of one of the gates after service– showing no coating breakdown.
Corrocoat Ltd, Forster Street, Leeds LS10 1PW Tel +44 (0) 113 276 0760 Fax +44 (0) 113 276 0700 www.corrocoat.com
