Page 207 - Pipeline Rules of Thumb Handbook

194 Pipeline Rules of Thumb Handbook

Since the coefficient of friction parameter is the same in all Thinfilm epoxy. The epoxy coating simulated a thinfilm
of the above expressions, the plate test system can be used to epoxy resin pipeline coating applied by the fusion method.
simulate the soil to pipeline interface. Plates used in the tests were coated by the fluidized bed
method. However, the surface texture was the same as that
Coal tar felt. The coal tar coating, an enamel and felt expected by coating plant production equipment.
combination, was prepared to simulate an actual coated
pipeline. Results
The surface of a steel plate was coal tar coated and then Coal tar to soils. Figure 1 illustrates that the friction
wrapped in a 15-lb felt. Therefore, the soil surface contact coefficient varies from 0.59 to 0.91 for the various soils tested
was predominantly to the felt material. at field moisture content.

Figure 1. Coefficient of friction for coal tar
coating to soil.

Figure 2. Coefficient of friction for thin film epoxy
to soil.