Preventative maintenance to reduce corrosive attack on transformers is best applied by specialists. Ensuring protective coatings are applied to the most vulnerable areas is vital on all transformers from the smallest distribution unit to the largest supergrid.
The cleaning and painting process includes
steam cleaning and de-rusting, followed by painting with airless spray, or by the flood coating method. On large transformers the radiator banks have to be painted by the flood coating method in order to ensure the more inaccessible areas are properly coated.
Utilising Rosh Engineering's multi skilled workforce ensures that both cleaning, painting and mechanical works can be completed by the same team during our visit to the site. A regular cleaning and painting programme will ensure that no mechanical failure of a transformer or associated equipment during its life cycle, keeping the operating costs down in the long term.
Rosh engineers are available to give a full assessment on the plant's condition and provide advice for regular maintenance schedules according to each site's individual environmental conditions.
A typical paint specification
applied to transformers is that developed by the
UK's formor Central Electricity Generating Board (CEGB) as follows:
Paint
spec:
Formulation Standard
Colour Standard
Primer:
Zinc Phosphate
BS
5493 Type FP3A
N/A
Undercoat:
MIO
BS
5493 Type FU1B
Natural Pigment
Top Coat:
Grey Gloss`
BS
5493 Type FF3A
BS
4800 08B25
The British Standard for this specification
recommends re-painting every 5 years in a 'marine' environment
such as in a coastal location or within a few
miles of the sea, and 10 years elsewhere.
Other specification can be applied according to customer requirements although we recommend choosing a system that will readily accept aftercoating.
