Rotational Lining

We rotationally line (rotoline) tanks, scrubbers, pipe, fittings, pumps, valves, flowmeters, filter housings, heat exchangers, and other process equipment. Complex and internal geometries are easily lined without access to internal surfaces.

Advantages and Disadvantages of Rotational Lining

Advantages of Rotational LiningDisadvantages of Rotational Lining
Seamless liners eliminate failure prone weld jointsSome internal components, such as large baffles, are difficult to line
High structural integrity of the part is maintainedRotational lining is a shop process, which means the liner cannot be installed in the field
Easy to seal flanges with reduced risk of leak in operationThe size of equipment that can be lined is limited to the dimensions of the rotational lining oven
Vast range of liner choices can be melt-flow processed including nylons, olefins, and fluoropolymers
Fully bonded liner can withstand vacuum and eliminate annular space for permeation to collect and condense
Operating temperatures allowed through the full temperature range of the chosen thermoplastic liner
The liner can only be applied to a wide range of metallic substrates

Rotational Lining Process

Rotational lining applies a layer of thermoplastic material onto the interior surface of a vessel, creating a mechanically bonded liner.

Step 1

The first step of the process is to prepare the interior surface of the vessel to white metal. Next, the vessel is mounted to a multi-axis rotational lining machine. Thermoplastic resin is placed inside the vessel.

Step 2

 The vessel is rotated inside of an oven. As the vessel rotates, the polymer becomes molten and forms an even layer across all internal surfaces.

Step 3

The vessel then goes through a cooling process to set the liner in place.

Step 4

The caps are removed from the ends of the vessel. Flange faces are machined to provide a smooth sealing surface. Liner integrity is then validated using ultrasonic thickness gauges and spark testing. Lastly, paint is applied to the exterior of the vessel (optional).

Rotational Lining Materials

We use a variety of thermoplastic polymers that provide corrosion resistance. Below are the materials we use. Contact us to discuss what material is the best solution for your project.

wdt_IDMaterialApplicationMaximum Service TemperatureData Sheet
MaterialApplicationMaximum Service TemperatureData Sheet

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