Bondaliner™ for Fittings


Bodaliner™ a technology based on rotational lining, is a technology that allows engineers to bond thermoplastic polymer to the interior of tanks, vessels, pipes, pipe fittings, and other types of process equipment. The resulting layer of polymer adds corrosion protection and resistance to chemicals.

Bondaliner™ Process:

Bondaliner™ is applied via a rotational process. Technicians place granulated powder resin inside the vessel or similar process equipment, seal all its openings, and then mount the vessel inside an oven. The oven rotates on two perpendicular axes at low rpm, giving the resin time to melt and spread uniformly over all interior surfaces of the equipment. The rotation of the oven causes the polymer to mold itself to the interior shape of the vessel. The treated equipment is slowly cooled to prevent shrinkage and warpage. Upon cooling, the polymer provides a seamless, permanently bonded liner.

Depending on the polymer used and the equipment’s service application, the thickness of a rotational lining ranges from 4mm to12mm, thicker than most lining alternatives. A thick lining provides more corrosion and abrasion protection and maximizes service life of the equipment.

Bodaliner™ a versatile process.

  • There are multiple benefits with Bondaliner™
  • Because the lining is monolithic and seamless, there are no weld joints to act as potential points of failure.
  • The structural integrity of the equipment is maintained and even enhanced.
  • Bondaliner™ provides a seamless transition to a flange, making flanges easy to seal and reducing the risk of leaks.
  • No other lining technique offers as wide a range of materials, allowing the material to be matched to its application.
  • Fully bonded liner can withstand vacuum and eliminate annular space for permeation to collect and condense.
  • Operating temperatures are allowed through the full temperature range of the material chosen for the liner.
  • Bondaliner™ is suitable for a wide range of metallic substrates.

Polymers used in Bondaliner™ solutions.

Polymer linings are selected depending on the application. Many polymers can be melt-flow processed including olefins, nylons, and fluoropolymers. A variety of these thermoplastic polymers may be selected to achieve the needed levels of chemical resistance, abrasion resistance, and corrosion resistance protection.

Proper polymer selection takes into account the compatibility of the material with the chemicals expected in the application. Other selection criteria include the material’s ability to bond with the substrate, its temperature performance, and of course, cost. The broad array of options allows engineers to tailor the lining to fit the needs of the application. The ideal selection of material will maximize the life of the treated equipment and reduce maintenance costs.

These materials must be formulated to enhance their ability to bond with surfaces. To prepare a surface for receiving a lining, the metal substrate must be clean and shot blasted to achieve a near white state. A clean and microscopically rough surface promotes mechanical bonding of the polymer to the metal.

Common materials for rotational lining solutions include:

  • PE (Polyethylene)
  • PP (Polypropylene)
  • ETFE (Tefzel)
  • PFA (Teflon)
  • PVDF (Kynar)

Bio-Armor

One innovative material is HDPE blended with a biocide to deter the growth of biological films that can lead to microbially influenced corrosion when seawater is the process fluid. Over time, build up can even cause fouling of process lines, leading to costly maintenance.

For more information, contact info@unitedsts.com