Pipeline and Metal Corrosion Protection

Combining seamless, bonded linings to metal structures results in longer service life at a lower cost than using expensive metal alloys such as Hastelloy® or super duplex stainless steel, or powder coatings and sheet lining. Rotational lining provides the designer with the structural qualities of metal while protecting the metal substrate from its vulnerability to many forms of corrosion.
RMB Products has redefined what can be rotationally lined. We have developed our technologies to line large or small substrates, and we are capable of lining the simplest to the most complex structure.

Advantages of Rotational Lining

  • Uniform thermoplastic layer for the interior of vessels—regardless of complex geometry
  • Provides a bonded interior liner without the use of adhesives and without the need to access interior parts
  • Able to line large structures seamlessly without stressing the thermoplastic liner for pipeline corrosion protection
  • View the application brief: The Benefits of Rotolining vs. Alternative Technologies

Rotational Lining Process

After preparing the interior surface of the vessel (also known as the substrate, or what will become the exterior of the lined component), the vessel is mounted to a multiaxis rotational lining machine. Rotational-grade polymer in granular form is placed inside the metal substrate and heated while being rotated simultaneously about two perpendicular axes. During the heating cycle, the polymer particles melt and adhere to the metal substrate, forming a uniform layer of thermoplastic. Typical wall thickness varies from 0.100" to 0.250", depending on the size of the part and service requirements.

After a predetermined time at a specific temperature, all plastic is distributed over the interior surface of the part; the substrate is then cooled by a combination of forced air and water mist. The resin solidifies and bonds to the substrate, creating a seamlessly lined complete assembly. The resulting product is sealed, machined to tight tolerances or otherwise finished for the customer.

Maximum Size of Lined Structures

  • Rotational molding/lining machine: diameter ≤ 140" (11'8") when length ≤ 144" (12')
  • Rock and roll machine: diameter ≤ 72" (6'0") when length ≤ 256" (21'4")

Available Lining Materials

  • Fluoropolymers (ethylene tetrafluoroethylene—ETFE, perfluoroalkoxy—PFA, polyvinylidene fluoride—PVDF)
  • Nylon 12 (RMB 8421E2—proprietary)
  • Olefins (high-density polyethylene—HDPE)