1. Cov kav dej rau cov kav dej. Xws li: seamless yeeb nkab rau dej, roj yeeb nkab, chav yeeb nkab, roj xa cov yeeb nkab, roj thiab cov pa roj carbon dioxide. Agricultural irrigation dej faucet nrog yeeb nkab thiab sprinkler irrigation yeeb nkab.
2. Cov yeeb nkab rau cov khoom siv thermal. Xws li cov yeeb nkab dej kub npau npau, superheated chav yeeb nkab rau boilers dav, superheating yeeb nkab rau locomotive boilers, cov pa luam yeeb loj, cov pa luam yeeb me me, arch cib yeeb nkab thiab kub siab boiler yeeb nkab.
3. Cov yeeb nkab rau kev lag luam machinery. Xws li aviation qauv raj (round raj, oval raj, ca oval raj), tsheb qag raj, qag raj, tsheb laij teb qauv raj, tsheb laij teb roj txias tube, ua liaj ua teb machinery square raj thiab lub raj raj, transformer raj thiab bearing tube.
4. Cov yeeb nkab rau roj av geological drilling. Xws li: roj drilling yeeb nkab, roj laum yeeb nkab (kelly yeeb nkab thiab hexagonal laum yeeb nkab), drilling stick, roj tubing, roj casing thiab ntau yam yeeb nkab sib txuas, geological drilling yeeb nkab (tub ntxhais yeeb nkab, casing, active laum yeeb nkab, laum stick, nias hoop thiab pin sib koom, thiab lwm yam).
5. Tube rau kev lag luam tshuaj. Xws li: petroleum cracking yeeb nkab, chemical khoom kub exchanger thiab pipeline yeeb nkab, stainless acid resistant yeeb nkab, siab siab yeeb nkab rau chiv thiab yeeb nkab rau conveying chemical media.
6. Lwm lub tuam tsev siv cov raj. Xws li: lub thawv raj (lub tog raj kheej lub tog raj kheej thiab cov thawv ntim dav dav), ntsuas lub raj, saib lub raj raj, koob txhaj tshuaj thiab cov khoom siv kho mob raj.
