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Credibility ,ASME/ANSI B16.5-1996 and B16.47-1996 |
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Tolerances on flange dimensions (ASME/ANSI B16.5 and B16.7, and MSS SP-44) |
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Dimension |
Range |
Tolerance |
|
in |
mm |
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General and Blind Flanges(For blind flange dimendions see page 8-23 for |
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G(raised face |
≤NPS 24 |
±0.03 |
±0.76 |
≥NPS 26,with |
±0.08 |
±2.03 |
|
≥NPS 26,with |
±0.04 |
±1.02 |
|
I(bolt hole diameter) |
All |
No tolerance in B16.5 or B 16.47 |
|
J(bolt circle diameter) |
All |
±0.06 |
±1.52 |
Center to center of |
All |
±0.03 |
±0.76 |
Eccenticity of bolt |
≤NPS 2½ |
±0.03 |
±0.76 |
≥NPS 3 |
±0.06 |
±1.52 |
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Weld Neck Flanges1 (For dimensions see page 8-10 for B 16.5, page 8-46 for |
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D(overall length) |
≤NPS 4 |
﹢0.06 |
﹢1.52 |
NPS 5 to 10 |
﹢0.06,﹣0.12 |
﹢1.52,﹣3.05 |
|
NPS 12 to 24 |
﹢0.12,﹣0.18 |
﹢3.05,﹣4.57 |
|
≥NPS 26 |
±0.19 |
±4.83 |
|
Thickness of hub |
All |
>87.5% of pipe nominal wall thickness |
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Slip on(see page 8-17),Lap Joint(see page8-32) and Socket Welding(see page |
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B(inside diameter,or |
≤NPS10 |
﹢0.03,﹣0.0 |
﹢0.76,﹣0.0 |
≥NPS12 |
﹢0.06,﹣0.0 |
﹢1.52,﹣0.0 |
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Threaded Flanges (see page 8-40 for dimensions): |
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B(counterbore) |
≤NPS10 |
﹢0.03,﹣0.0 |
﹢0.76,﹣0.0 |
≥NPS12 |
﹢0.06,﹣0.0 |
﹢1.52,﹣0.0 |
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