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 flangesHUB 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-Welding10" 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)
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 face0.06" Raised Face+/- .03"(0.8mm)Diameter of Hub at baseX<=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)
DrillingBolt Circle1/2"-24"
/26"-42"		DrillingBolt Circle1/2"-24"
/26"-42"
+/-.06"(1.6mm)
+/-.06"		+/-.06"(1.6mm)
+/-.06"
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)
Thickness18"& Small+.12"(3.2mm),-0"Thickness18"& 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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