These SF6 expansion joints for circuit breakers GIS ( gas insulated switchgear) with bellows in ASTM A 316 Ti GRADE stainless steel are having square fixed flanges in stainless steel ASTM A 304 GRADE stainless steel. All construction is in stainless steel. Entire welding is done by (TIG) Argon arc welding by section IX-qualified welding process. Flanges are provided with four holes at corners for the provision of four limit rods at the corners. These have been designed for a design pressure of 6 bar(g). Hydro-tested at 9 bar(g). Also, there are being tested for CO2 leakage test at 4 bar(g).
These can also withstand vacuum up to 1 mbar. There are no sharp corners and all welds are finished ground. These have been exclusively designed , developed and manufactured by us for a global engineering major and we regularly supply these to many electrical engineering construction companies executing large projects for circuit breakers.