GB/T 9711 LSAW steel pipe vs GB/T 3091 LSAW Steel Pipe

Even for same type of steel pipe, like LSAW steel pipe or SSAW steel pipe, we know that there is subtle difference for them. Today, we would have a list for the GB/T 9711 LSAW steel pipe vs GB/T 3091 LSAW Steel Pipe to have a better understanding for them. product OD Thickness Length Main usage GB/T 9711 168-1820mm 5-50mm 3-18M 3-18M Petroleum and natural gas industries GB/T 3091 168-1820mm 5-50mm 3-18M 3-12M water, air, steam heating, gas, such as low pressure fluid conveying in welded steel pipe From the chart, we can get that for same OD, thickness, just for different length, we can find that the main usage has changed a lot. So we should thick twice before the purchasing.