Dimensional tolerances for AWWA pipe flanges
Listed below are the Dimensional Tolerances to which flanges are manufactured. These tolerances are a part of ANSI B16.5 and AWWA C207-01 Sec. 4.2 except where noted otherwise. The limits given are maximum. Rigid inspection procedure assures the maintenance of high standards of accuracy in regular day to day production.
| Ring type Slip-on and Blind flanges | HUB type slip-on | ||||
| O.D. | <=24" | +/- 0.6"(1.6mm) | O.D. | <=24" | +/- 0.6"(1.6mm) |
| >24" | +/- .12"(3.2mm) | >24" | +/- .12"(3.2mm) | ||
| I.D. | Socket-Welding | 10" and Samller +.03"(0.8mm),-0" |
I.D. | 10" and Samller | +.03"(0.8mm) |
| Slip-on and Lap Joint |
12" and Larger +.06"(1.6mm),-0" |
12"-18" | +/-.06"(1.6mm) | ||
| 20"-42" | +.12"(3.2mm) +.06"(1.6mm) |
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| O.D. of Hub | <=12" | +.09"(2.4mm), -.06"(1.6mm) |
Diameter of Contact Face |
0.06" Raised Face | +/-.03"(0.8mm) |
| 14"-42" | +/-.12"(3.2mm) | ||||
| Diameter of Contact face | 0.06" Raised Face | +/- .03"(0.8mm) | Diameter of Hub at base | X<=24" | +/-.06"(1.6mm) |
| X>24" | +/-.12"(3.2mm) | ||||
| Deameter of Contact face | <=10" | +.03"(0.8mm), -0" |
Diameter of Hub at point of Welding | <=5" | +.09"(2.4mm), -.03"(0.8mm) |
| 12"-42" | +.06"(1.6mm), -0" |
>=6" | +.16"(4.0mm), -.03"(0.8mm) |
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| Drilling | Bolt Circle | 1/2"-24" /26"-42" |
Drilling | Bolt Circle | 1/2"-24" /26"-42" |
| +/-.06"(1.6mm) +/-.06" |
+/-.06"(1.6mm) +/-.06" |
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| Bolt hole spacing |
+/-.03"(0.8mm) | Bolt hole spacing |
+/-.03"(0.8mm) | ||
| Eccentricity of Bolt circle with respect to bore | .03" Max. (0.8mm) |
Eccentricity of Bolt circle with respect to bore | .03" Max. (0.8mm) |
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| Thickness | 18"& Small | +.12"(3.2mm),-0" | Thickness | 18"& Small | +.12"(3.2mm),-0" |
| 20"-42" | +.19"(1.6mm) | 20"-42" | +.19"(1.6mm) | ||
| Length Thru Hub | <=10" | +/-.06"(1.6mm) | Length Thru Hub | <=10" | +/-.06"(1.6mm) |
| 12"-42" | +/1.12"(3.2mm) | 12"-42" | +/1.12"(3.2mm) | ||
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