Composite weld-neck and composite slip-on flanges are made up from two components,an internal flanges (welding collar) in Cu-Ni 90/10, Cu-Ni 70/30 and an external flange in carbon steel.Composite blind flanges are made up from acarbon steel blind flange overlayed-on, and machined disc in Cu-Ni 90/10 or Cu-Ni 70/30.
Solid flanges in Cu-Ni 90/10 or Cu-Ni 70/30 are produced from bar by hot forging and machining, Solid flanges in bronze are produced by casting and machining.Solid flanges in Leaded yellow brass are produced by extrusion bar and machining.Solid Silver-Brazing Flanges Solid silver brazing flanges incorporate integral silver-brazing alloy rings and under normal circumstances.There is generally no need to socket feed with additional brazing alloy.The silver brazing alloy to AWS A5.8(BAG1, BAG7), JIS E3261 (BAG1, BAG7) or BS1845 (AG1, AG7).
Composite and solid flanges are available in standard sizes machining those of the relevant pipe and butt welding fittings.Non-standard size flanges are produced to certain minimum quantity limitations, availability on application.
All flange jointing faces are machine finished according to ASME B16.5 including smooth finish.
Inspection and Testing
Series of stringent quality-control inspections and tests are performed throughout the entire manufacturing process,from melting and alloying to the finished product to ensure product quality which complies with the customer°Øs requirements.Final inspection generally includes visual and dimensional control as well as chemical and mechanical tests to ensure chemical, physical and dimensional accuracy.
All flanges are supplied with a certificate listing the tests which have been performed in accordance with relevant specifications and / or customer requests.
The utmost care is taken to ensure that butt-welding fittings are fully protected against damage during transit.