This Standard specifies the external polyethylene powder coated steel pipes (hereafter referred to as "coated steel pipes")mainly used for underground services transporting gas, oil, water.This Standard is generally applicable to straight pipes and deformed pipes of outside diameters 21.7 mm (nominal diameter 15A or (1/2)B) to 1625.6 mm (nominal diameter 1600A or 64B). The coated steel pipes are usually used at temperatures in the range of -40 ℃ to +60 ℃.