What is the wall thickness specification standard of welded steel pipe for gas?

1. Welded steel pipe: hot-dip galvanized pipe conforming to national gb/t 13793-200 1; straight seam welded steel pipe conforming to national GB/T309 1 for transportation and structure of low-pressure fluids such as water, sewage, gas, air and heating steam. Third, the national standard product steel pipe national standard: length: 6 meters/four, welded pipe, galvanized pipe meter model /mm nominal diameter /in specification /mm (outer diameter * wall thickness) welded pipe national standard meter weight kg/m galvanized pipe national standard meter weight kg/m pieces dn 154 minutes 2 1. 3*2。 75 1。 26 1。 342 17 pieces/piece dn206 national standard for welded steel pipes. 8*2。 75 1。 63 1。 The theoretical weight table of 73 169 dn straight welded pipes is 33. 5*3。 252。 422。 Seamless branch pipe/piece dn32 1 for high-pressure boiler. 2 inches, 42 inches. 3*3。 253。 133。 329 1 piece /CTN 40 1. 5' 48*3.53。 844。 079 1 piece/piece dn502 inch 60*3. 54。 885。 Hengyang steel pipe recruitment branch/piece dn652. 5' 75.5*3。 756。 647。 0437 pieces/piece dn803 inch 88. 5*4。 08。 348。 8437 pieces/piece dn 1004 inch 1 14*4. 0 10。 85 1 1。 50 19 pieces /CTN dn 1255 inches 140*4. 5 15。 04 15。 94 19 pieces /CTN dn 1506 inches 165*4. 5 17。 8 1 18。 88 19 PCs/CTN dn2008 inch 2 19*6. 03 1。 5233。 4 17/