In high volume process flow applications, requiring up to 72” piping, designers have limited options for corrosion resistance. Compared to others, the ROTOmax™ Roto-lined Products range of plastic-lined pipe and fittings is an economical choice in corrosive applications. Resistoflex’ thick, chemical resistant liners offer superior performance and durability.
Plastic liner materials include polypropylene, ETFE, andhigh-density polyethylene (HDPE).
ETFEEthylene tetrafluoroethylene is a partially fluorinated thermoplastic with several characteristics that make it ideal for rotational lining. Typical applications are hydrochloric acid, hydrofluoric acid, sulfuric acid, caustics, bleaches, all at temperatures up to 300°F. ETFE has the highest temperature and chemical resistance of any plastic except PTFE.
PPPolypropylene is a thermoplastic that offers good chemical resistance at a price point lower than ETFE. It is widely used in hydrochloric acid to 200°F, and also sees applications in sulfuric acid up to 80% concentration, and HF up to 60%. Where polypropylene has replaced Fusion Bonded Epoxy (FBE) lined piping in cooling water intake from brackish sources, pipe replacement has gone from every two years to ten years and longer.
HDPEHigh-density polyethylene provides an economical liner choice that is widely known for its abrasion resistance and general chemical resistance to 180°F. HDPE finds extensive use in the oilfield and natural gas production sites in wastewater and multiphase fluid pipelines. HDPE-lined pipe and fittings differ from field-installed HDPE liners by the bonding of the plastic to the metal substrate and the absence of plastic weld seams at the flare faces.
