1. Kev ua haujlwm siab heev, nrog rau qhov ceev tshaj plaws ntawm 150 meters ib feeb, deb tshaj qhov ceev ntawm cov tshuab vuam yeeb nkab ib txwm muaj.
2. Cov qoob loo ntau, kev tsim khoom sai, thiab kev siv cov khoom siv ruaj khov ua rau cov khoom tsim tau zoo dua thiab txo cov khib nyiab.
3. Kev poob qis. Kev ua haujlwm tau zoo thiab cov zis siab txo cov kev poob ntawm cov khoom thiab cov nqi tsim khoom.
4. Kev ua haujlwm siab, nrog rau qhov yuam kev ntawm txoj kab uas hla ntawm tsuas yog 0.5/100 ntawm txoj kab uas hla ntawm txoj kab uas hla, ntau tshaj qhov kev ua haujlwm ntawm cov tshuab vuam yeeb nkab ib txwm muaj, ua rau kev sib tw ntawm cov khoom lag luam zoo dua.
| ERW TUBE MILL LINE | |||||
| Qauv | Ryeeb nkab puag ncig mm | Plaub fabyeeb nkab mm | Qhov tuab mm | Kev ua haujlwm ceev m/feeb | |
| ERW 20 | Ф8-Ф20 | 6x6-15 × 15 | 0.3-1.5 | 120 | Nyeem Ntxiv |
| ERW32 | Ф10-Ф32 | 10 × 10-25 × 25 | 0.5-2.0 | 120 | |
| ERW50 | Ф20-Ф50 | 15 × 15-40 × 40 | 0.8-3.0 | 120 | |
| SIB 76 | Ф32-Ф76 | 25 × 25-60 × 60 | 1.2-4.0 | 120 | |
| ERW89 | Ф42-Ф89 | 35 × 35-70 × 70 | 1.5-4.5 | 110 | |
| ERW114 | Ф48-Ф114 | 40 × 40-90 × 90 | 1.5-4.5 | 65 | |
| ERW140 | Ф60-Ф140 | 50 × 50-110 × 110 | 2.0-5.0 | 60 | |
| ERW165 | Ф76-Ф165 | 60 × 60-130 × 130 | 2.0-6.0 | 50 | |
| ERW219 | Ф89-Ф219 | 70 × 70-170 × 170 | 2.0-8.0 | 50 | |
| ERW273 | Ф114-Ф273 | 90 × 90-210 × 210 | 3.0-10.0 | 45 | |
| ERW325 | Ф140-Ф325 | 110 × 110-250 × 250 | 4.0-12.7 | 40 | |
| ERW 377 | Ф165-Ф377 | 130 × 130-280 × 280 | 4.0-14.0 | 35 | |
| ERW406 | Ф219-Ф406 | 170 × 170-330 × 330 | 6.0-16.0 | 30 | |
| ERW508 | Ф273-Ф508 | 210 × 210-400 × 400 | 6.0-18.0 | 25 | Nyeem Ntxiv |
| ERW660 | Ф325-Ф660 | 250 × 250-500 × 500 | 6.0-20.0 | 20 | Nyeem Ntxiv |
| ERW720 | Ф355-Ф720 | 300 × 300-600 × 600 | 6.0-22.0 | 20 | Nyeem Ntxiv |
| Cov Kab Ntau Lawm Yeeb Nkab Hlau Stainless | |||||
| Qauv | Ryeeb nkab puag ncig mm | Plaub fabyeeb nkab mm | Qhov tuab mm | Ua haujlwm ceev m/feeb | |
| SS25 | Ф6-Ф25 | 5 × 5-20 × 20 | 0.2-0.8 | 10 | Nyeem Ntxiv |
| SS32 | Ф6-Ф32 | 5 × 5-25 × 25 | 0.2-1.0 | 10 | Nyeem Ntxiv |
| SS51 | Ф9-Ф51 | 7 × 7-40 × 40 | 0.2-1.5 | 10 | Nyeem Ntxiv |
| SS64 | Ф12-Ф64 | 10 × 10-50 × 50 | 0.3-2.0 | 10 | Nyeem Ntxiv |
| SS76 | Ф25-Ф76 | 20 × 20-60 × 60 | 0.3-2.0 | 10 | Nyeem Ntxiv |
| SS114 | Ф38-Ф114 | 30 × 30-90 × 90 | 0.4-2.5 | 10 | Nyeem Ntxiv |
| SS168 | Ф76-Ф168 | 60 × 60-130 × 130 | 1.0-3.5 | 10 | Nyeem Ntxiv |
| SS219 | Ф114-Ф219 | 90 × 90-170 × 170 | 1.0-4.0 | 10 | Nyeem Ntxiv |
| SS325 | Ф219-Ф325 | 170 × 170-250 × 250 | 2.0-8.0 | 3 | Nyeem Ntxiv |
| SS426 | Ф219-Ф426 | 170 × 170-330 × 330 | 3.0-10.0 | 3 | Nyeem Ntxiv |
| SS508 | Ф273-Ф508 | 210 × 210-400 × 400 | 4.0-12.0 | 3 | Nyeem Ntxiv |
| SS862 | Ф508-Ф862 | 400 × 400-600 × 600 | 6.0-16.0 | 2 | Nyeem Ntxiv |