Mr. P
Mechanical
- Oct 26, 2020
- 5
Dear Experts,
I would like to obtain the minimum thickness of the standard flange for in-service equipment or piping where undergone crevice corrosion resulting in wall loss on the flange thickness.
With regards to the minimum thickness of the standard flange in accordance with ASME 16.5, clause 7.4 Flange Thickness mentioned:
Required tolerances for flange thickness are as follows.
NPS ≤ 18, +3.0, −0.0 mm (+0.12, −0.0 in.)
NPS ≥ 20, +5.0, −0.0 mm (+0.19, −0.0 in.)
The plus tolerance is applicable to bolting bearing surfaces whether as-forged, as-cast, spot-faced or backfaced.
Could you please advise how to derive the minimum thickness with includes the bolting stress or bearing? Is there mentioned anywhere in the codes or calculation methods?
I would like to obtain the minimum thickness of the standard flange for in-service equipment or piping where undergone crevice corrosion resulting in wall loss on the flange thickness.
With regards to the minimum thickness of the standard flange in accordance with ASME 16.5, clause 7.4 Flange Thickness mentioned:
Required tolerances for flange thickness are as follows.
NPS ≤ 18, +3.0, −0.0 mm (+0.12, −0.0 in.)
NPS ≥ 20, +5.0, −0.0 mm (+0.19, −0.0 in.)
The plus tolerance is applicable to bolting bearing surfaces whether as-forged, as-cast, spot-faced or backfaced.
Could you please advise how to derive the minimum thickness with includes the bolting stress or bearing? Is there mentioned anywhere in the codes or calculation methods?