Today, I was asked about "Double-layered flange."
Original flanges for most Rotary Paddle Type are made ONE-PIECE with a case..Their material is AC. If different material (SS400/SUS304/316), larger size, different standard (ANSI) flange is required, we scrape off the original flange, make it smaller to match the expected size, then, the other flange will be layered on it.
