the process fluid does not touch the flange, selection of the back-up flange
is based upon:
¤ Operating Pressure/Temperature
Unique back-up rings are
computer designed with a configuration engineered for maximum performance.
The combination of hubs and back-up flange rings represent the most
innovative two piece (Van Stone) style flange available today.
¤ Dimensions are given in inches.
Painted or Hot Dipped Galvanized.
¤ O.D. and drilling are 150#
¤ Sizes larger than 36" available on request.
Stainless Steel available on request. Types of Back-Up Flanges