Main technical requirements of flanges
1. Surface quality: surface finish quality,no burr and black skin.

2. Treated for rust prevention: apply rust preventing oil.

3. Tolerance dimension: meet the requirements of the drawings or customer requirements

4. The requirement of materials: provide material sheet.

5. Welding quality: the full of weld seam, welding points without slag,porosity and other undesirable defect.

6. Sealing lines: have sealing lines or not, the form of sealing lines.

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