There is no spark or heat generated in the activation process which takes up to 15 minutes to complete for the largest sizes (12”) and far less for small sizes. The flange design is very simple with a pure metal-to-metal seal, and no moving parts, balls, springs, seals or gaskets.
The cold-forging tool forces the pipe wall into the grooves and this simultaneously affects the seal and grip on the pipe.
The assembled joint is stronger than the flange itself, and is energised by the natural relaxation “springback” of the deformed pipe material forced into the groove modification in the flanges and of the flange material, as it clamps-down on to the plastically-dilated pipe after its own elastic expansion during the activation process. These two processes generate huge contact pressures forming a seal and structural grip on the pipe.
The issue of crevice corrosion is dealt with through the application of Belzona, a 2-part epoxy paste which sets-hard to a metal-like consistency. Testing has proved this to be a suitable protection against an (unproven) threat of crevice corrosion.
The same testing has proved that Quickflange is no-more susceptible to corrosion inside or outside the pipe than would be a welded weld-neck flange.