Defines the technical specifications for the procurement of high pressure piping systems used in electricity generating stations (power stations). Not applicable to equipment used in nuclear reactor plant areas of nuclear power stations. Covers; hot and cold reheat lines, live steam lines, feedwater lines, safety valve discharge pipelines, bled steam pipelines, spray water lines for HP and RH-attemperators and steam-bypass-systems, pump minimum flow and balancing leak off lines, auxiliary steam supply lines, condensate lines, steam and water drains, vents and warming lines.