... -2000, GB/T9711-1997UsageAPI 5L oil, gas, coal and mine transmission Piling project Heat-supply project Conveying drinking water ... , drainage, coal gas, fuel gas, mine slurry and other low & middle pressure fluids Chemistry industry Electric power ... weight InspectionX-RAY FLAWDETECTION PRESSURETESTING ULTRASONIC MECHANICALAERFORMANCEANALYSIS SSAW Steel Pipe for gas pipeline project API 5L x52 ...