... 5L, SY/T5037-2000, 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 ... -RAY FLAWDETECTION PRESSURETESTING ULTRASONIC MECHANICALAERFORMANCEANALYSIS SSAW Steel Pipe for gas pipeline project API 5L x52 steel grade 14" OD