Painting Wet and Poorly Prepared Metal Pipes:

Chemco were asked to solve a pipeline corrosion problem at BP Grangemouth.

Failure of a lead based coating was causing a severe corrosion problem on 8” process pipe work.

This pipe work could not be taken off stream nor for environmental reasons could grit blasting be used to remove the hazardous lead based paint to prepare the pipe work surface for coating.

To compound these difficult application conditions, the pipes suffered from condensation making the surface not only

poorly prepared but also permanently  wet.

They required coatings that had the following that;                            Offered Long Term Corrosion Protection                          Required little surface preparation                          Adhered to wet and saturated surfaces. Chemco provided a number of products that in our experience offer all three characteristics.

They commissioned tests to be carried out to validate our claims that the products could be applied to wet substrates.

The test results are below.

The Pull off tests revealed that cohesive failure happened at pressures between 1100 - 1400 PSI.

These results are 2-3 times that expected for tradition coating.

As a result RL 500 PF is being used as a primer finish throughout the plant. It is also been specified as a one coat primer finish in the external refurbishment of four large fuel-oil storage tanks at BP Finart  where the weather conditions are very wet and humid.

The actual test report can be seen as following Pages:

                                                                 Painting Report Page 1

                                                                 Painting Report Page 2

                                                                 Painting Report Page 3

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