Steel lined flange PPH

Steel lined PPH flanges provide a structural steel backing ring beneath a PPH-lined sealing face, delivering the bolting strength needed for larger diameter or higher-load flange connections while keeping the process media fully isolated by the PPH lining.

Key characteristics:
• A steel core provides the structural rigidity and bolt-load-bearing capacity needed for demanding flange applications, particularly at larger diameters where an all-plastic flange ring would be more prone to deformation under bolt torque.
• The PPH lining on the wetted sealing face keeps the flow path fully isolated from the steel core, preserving PPH's chemical resistance and elevated temperature performance at the point of contact with process media.
• The combination targets applications where mechanical loading from bolting, pipe weight, or external forces exceeds what an unreinforced plastic flange ring can reliably handle over the long term.
• Compatible with standard flange face and bolt-hole patterns, allowing straightforward integration with mating valves, pumps, and equipment flanges.

By separating the structural function (steel core) from the chemical-resistance function (PPH lining), this flange design extends PPH piping systems into applications with mechanical demands that would otherwise require stepping up to a different, less chemically resistant flange material.

Typical applications include large-diameter PPH process lines, installations with significant pipe weight or external mechanical loading on flange connections, and high-temperature chemical process piping requiring both structural strength and chemical isolation at the flange.