... 6, PN 10, PN16, PN25, PN40 and PN64Applications rangesuch as oil industry,chemical industry, water conservancy, electric power, boiler, machinery, metallurgy, sanitary construction ... productions process are made under the ISO9001:2000 strictly.5Applications:oil industry,chemical industry, water conservancy, electric power, boiler, machinery, metallurgy, sanitary construction ...