Epoxy coal pitch anti-corrosion steel pipe production process flow

first step: 1. steel pipe → shot blasting (or sandblasting) to remove rust → 2. steel pipe sand blowing and dust surface cleaning → 3. pre-coat the weld with epoxy zinc-rich primer → 4. spray epoxy with airless spray painting method zinc-rich primer → 5. spray epoxy coal pitch paint → 6. wrap with glass cloth → 7. spray epoxy coal pitch paint → 8. wrap with glass cloth → 9. spray 2 coats of epoxy asphalt paint → 10. curing of coating →11. quality inspection →12. correction →13. submit.

second step: pipe repair lining: 1. steel pipe butt welding → 2. cooling → 3. polish the weld repair at the end of the pipe to st3 level → 4. reapply epoxy zinc-rich primer → 5. reapply epoxy asphalt paint and pipe body (overlap 100mm) → 6. wrap with glass cloth → 7. spray epoxy asphalt paint → 8. wrap with glass cloth → 9. spray 2 coats of epoxy asphalt paint → 10. coating curing → 11. quality inspection → 12. correction → 13. submit.