Material Acc of Flanges

This discussion is part of Material Acceptance - Steel Material for describe additional requirements of Flanges

a) Ordering Information

Information items to be considered in the purchase order are not limited to the following:

i) Specification designation (the year date should be included).
ii) Quantity
iii) Size and pressure class or dimensions (tolerances and surface finishes should be included).
iv) Supplementary requirements.
v) Certification

b) Marking

Identification marks shall be forged or legibly stamped on each piece, and in such a position as not to injure the usefulness of the flanges.

Identification marks consisting of the manufacturer’s symbol or name, the heat number or manufacturer’s identification, designation of service rating.

When test reports are required for larger products, the markings shall consist of the manufacturer’s symbol or name, this specification number, and such other marking as necessary to identify the part with the test report.

c) The flange shall be cleaned to remove all scale and processing compounds prior to final surface examination, the cleaning process shall not injure the surface finish, material properties, or the metallurgical structure. The cleaned flange shall be protected to prevent recontamination.

The protective coatings shall be suitable for subsequent welding without removal of the coating.

d) In the case where there are surface imperfections, the manufacturer may remove or repair the defect by grinding, machining and welding.

d.1. Repair by grinding or machining

The wall thickness at the point of grinding, or at imperfections shall not be less than the minimum specified or required wall thickness.

d.2. Repair by Welding
- Discontinuities shall be completely removed before welding.

- All welds shall be made by welders, welding operators, and welding procedure qualified under the provisions of ASME Section IX and heat treated after welding in accordance with relevant specification.

- Defects shall be completely removed by chipping or grinding to sound metal as verify by magnetic particle inspection prior to welding.

- After repair welding, the area welded shall be ground smooth to the original contour and shall be completely free of defect as verified by magnetic particle or liquid penetrant inspection.