Marzolf Co., The

Here you will find two solutions to strengthen and eliminate cracking molded FRP flanges. Lightweight backing rings designed to back-up and strengthen fiberglass reinforced pipe flanges. These rings fit behind molded fiberglass reinforced pipe flanges, effectively dispersing bolt stresses, to facilitate greater allowable bolt torques, and eliminate cracked FRP flanges. Spacer Plates in this section are engineered to fit between fiberglass flanges and raised face flanges to preclude bending of the fiberglass flanges. Spacer Plates are available in a variety of materials; including coated carbon steel, polypropylene, and stainless steel.

The following tables include specifications for rings to fit OD Tube Stub Ends and OD Tube Angle Rings in both Class 75 and Class 150. We stock all these in both carbon steel and stainless steel.

The following tables will include specifications for rings to fit iron pipe sized fittings and tube sized angle face rings. The tables include Class 150 drilling and Class 300 drilling, sized for Class 75 service, Class 150 service, and Class 300 service. You’ll find specifications for rings to fit stub ends, angle rings, and ductile iron pipe. There are separate tables for both carbon steel and stainless steel.

The links to the tables below will help you locate rings to fit Polyethylene Pipe and HDPE Flange Adapters, in both carbon steel and stainless steel.