Devcon Maintenance and Repair Solutions - Sintemar

Field Application Reports
Location 130
Transformer Oil Leak
Repair
Products: One Minute Epoxy / Fasmetal /
Application Date: Flexane® 80 Putty
Application Customer: Date: 3/16/96
Customer: Industry: Alabama Power
Industry: Utility Power Distribution
Problem:
Transformers often develop leaks in a variety of areas such as radiator fins, flanges, circuit breakers,
valves, and fastener assemblies. The leak on this radiator fin is so severe that oil coolant levels would
drop, resulting in a catastrophic failure of this transformer. Previous method of repair was to drain
coolant oil and replace complete radiator assembly.
Solution:
One Minute Epoxy is compressed onto the leak area by hand using a polypropylene sheet. (Inserting a
machine screw to slow the leak prior to applying One Minute Epoxy is advised.) Once the leak has
stopped, the complete repair area was roughened to aSSPC-SP5 white metal finish using a wire bush.
Repair area was then chemically cleaned using Cleaner Blend 300. Fasmetal was applied to a thickness
of 1/8” over the One Minute Epoxy extending 5mm beyond the One Minute Epoxy. Following a partial
cure of Fasmetal, (1 hour), FL10 and FL20 Primers were applied and each allowed to cure or dry for 15
minutes. Using both primers will improve adhesion of Flexane 80 Putty from 25 pli to 50 pli. Flexane 80
Putty was applied to a thickness of 1/2” ,extending beyond the Fasmetal by 2 inches. Flexane 80 Putty
provided a long lasting, flexible, (350% elongation), final seal that is resistant to vibration and thermal
cycling. Following full cure, (24 hours), Flexane 80 putty was then painted.