Steel Backing Ring (Galvanized/Epoxy)

In polyethylene piping systems, flanged connections are utilized to mate lines with valves, pumps, strainers, and steel vessels. A polyethylene stub end is butt-fused to the pipe termination, featuring an expanded sealing face. The loose steel backing ring slips behind the stub shoulder, transmitting the axial clamp load from tightened bolts across the flange gasket to establish a leak-free seal.

In alignment with EN 1092-1 dimensional specifications for steel flanges, bolt circle diameters, hole counts, and bore clearances correspond strictly with PN10 and PN16 pressure standards. The high flexural rigidity of carbon steel prevents flange bowing under bolt torque, maintaining uniform gasket compression across the joint face.

Steel backing rings are typically supplied to match PE stub end outside diameters from 63 to 630 mm across PN10 and PN16 pressure classes. To combat corrosive dampness inside underground valve vaults, rings are furnished with hot-dip galvanized coating or electrostatic fusion-bonded epoxy.

During installation, bolts must be torqued progressively in an alternating cross-star sequence using calibrated torque wrenches to prevent eccentric loading on the PE stub shoulder. Specify your outside pipe diameter and pressure class in our RFQ form for formal submittals.