For more than 60 years now, internal plastic coatings have been used for corrosion protection, hydraulic
improvement, and deposition mitigation in tubular goods and drill pipe. Internal plastic coatings have
historically proven to be a long-term corrosion control solution, even with difficult to treat applications
such as top of the line corrosion. For hydraulic efficiency, internal plastic coatings have shown to be
able to improve overall flow, allowing for a reduction in pipe size simply by reducing the surface
roughness and inherent surface friction. For deposit mitigation, internal plastic coatings have shown the
ability to reduce or completely stop the adherence of deposits onto the pipe surface. These benefits have
been proven effective in applications from subsea pipelines to simple flowlines tying into an onshore
wellhead. Forty years ago, a new and novel connection system allowed for internally plastic coated
pipelines to be welded while still having effective protection of the internal weld zone from the
environment. This connection system allowed for benefits such as corrosion protection, hydraulic
efficiency, and deposit mitigation to be realized in pipeline applications.