• SMLS: seamless stainless hlau yeeb nkab
• ERW ： fais fab vuam
• EFW: hluav taws xob-fusion welded
• SAW ： submerged arc vuam
• SAWL ： Ntev
• SS ： stainless hlau
• PE: dawb tag
• Be vel Beveled kawg
• Xov kawg:
• BW: taub qab welded kawg
• Cap
• NPT ： cov yeeb nkab thoob teb
