Inspection of Flange Face

[ABHISHEK GHOSH]

Dear Experts, 

During inspection of Flange ( WNRF) , I found some imperfections on Face of Flange .Kindly refer attached document to view snaps of 3 flanges. This  condition is before hydro test. I found this during Bolt Torquing process.   

Kindly guide me to decide whether these 3 flanges can be accepted or rejected ? - Also mention code reference in support of Acceptance or Rejection . 

Thank you for your time . 

Regards. 

ABHISHEK GHOSH 

[pradip kumar Sil]

Hi Abhishek,

Pls check ASME B-16.5 Table -3

Regards

 

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Following will answer your query…

According to this the flange is not acceptable.

 

6.4.5 Flange Facing Finish. Flange facing finishes

shall be in accordance with paras. 6.4.5.1 through 6.4.5.3,

except that other finishes may be furnished by

agreement between the user and the manufacturer. The

finish of the gasket contact faces shall be judged by

visual comparison with Ra standards (see ASME B46.1)

and not by instruments having stylus tracers and electronic

amplification.

6.4.5.1 Tongue and Groove and Small Male and

Female. The gasket contact surface finish shall not

exceed 3.2 _m (125 _in.) roughness.

6.4.5.2 Ring Joint. The side wall surface finish of

the gasket groove shall not exceed 1.6 _m (63 _in.)

roughness.

6.4.5.3 Other Flange Facings. Either a serrated

concentric or serrated spiral finish having a resultant

surface finish from 3.2 _mto 6.3 _m(125 _in. to 250 _in.)

average roughness shall be furnished. The cutting tool

employed should have an approximate 1.5 mm (0.06 in.)

or larger radius, and there should be from 1.8 grooves/

mm through 2.2 grooves/mm (45 grooves/in. through

55 grooves/in.).

6.4.6 Flange Facing Finish Imperfections. Imperfections

in the flange facing finish shall not exceed the

dimensions shown in Table 3 (Table II-3 of Mandatory

Appendix II). A distance of at least four times the maximum

radial projection shall separate adjacent imperfections.

A radial projection shall be measured by the

difference between an outer radius and inner radius

encompassing the imperfection where the radii are

struck from the centerline of the bore. Imperfections

less than half the depth of the serrations shall not be

considered cause for rejection. Protrusions above the

serrations are not permitted.

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