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Case Study: High Temperature Coating of Vessels
Coating of Carbon Steel Vessels with a High Temperature Coating System
Local Steel Fabricator working for a major, long established UK Engineering firm.
Scope of Work
Specification: Degrease, grit blast and coat with a carbon steel High Temperature Coating System to a total nominal dry film thickness of 125 microns, suitable for temperatures of 120°C and above. QA: Surface dust Level 2. Surface salts less than 50mg/m2.
Ethyl Zinc Silicate Primer and Heat Resisting Silicone Aluminium Finish.
The Vessels were washed and grit blasted externally to a cleanliness standard of Sa2½ in accordance with ISO 8501-1:2007 with an average surface profile of 40 to
75 microns. Surface dust levels were checked to Level 2, while surface salts were tested using the Bresle Method in accordance with ISO 8502-6, with both found to be within acceptable levels. The Ethyl Zinc Silicate primer was applied to a nominal dry film thickness of 75 microns, followed by two coats of the Silicone Aluminium applied to a total nominal dry film thickness of 50 microns. On completion, the coating was tested and was found to be to a total nominal dry film thickness of 125 microns as specified.
The Ethyl Zinc Silicate primer is capable of withstanding temperatures to of up to 400°C. The Silicone Aluminium is, in isolation, capable of withstanding temperatures of up to 600°C. Ordinarily, a silicone aluminium will not fully cure until first put into high temperature service.
Main Image: A vessel complete and ready for return.