PSL Limited manufactures Coal Tar Enamel Coating for Pipes. PSL Limited has been awarded with ISO 9001:2000 & ISO 14001:2004 certifications. The company manufactures various types of steel pipes, pipe mills and machinery as well as anticorrosive coating of steel pipes. The Coal Tar Enamel Coating for Pipes consist of applying a coat of coal-tar enamel having a minimum thickness of 24 micron/2.4mm over the primed pipe and one wrap of glass-fiber mat. A second coat of coal-tar enamel having a minimum thickness of 2400 micron/2.4mm is applied followed by an outer-wrap of coal-tar impregnated glass fiber felt. This Enamel Coating has minimum thickness of 4800 micron/4.8mm +/- 1.0/0.0mm.