Flange & Fitting

Technical Drawing In Appendix B, AWWA C207 has also provided information on hub flanges covering Class D and Class E. Compared with ring flanges, the hub flange is furnished with an extended hub, reinforcing the flange while facilitating the welding process. The working pressure limit at water service temperature for AWWA C207 Class D hub flange is 175 psi for …

Technical Drawing The working pressure limit at water service temperature for AWWA C207 Class F blind flange is 300 psi and the maximum pressure (test or transient) allowed can be up to 450 psi. These flanges have the same outside diameter and drilling pattern as ASME B16.1 Class 250 cast-iron pipe and flanged fittings and ASME B16.5 Class 300 for …

Technical Drawing The working pressure limit at water service temperature for AWWA C207 Class E blind flange is 275 psi and the maximum pressure (test or transient) allowed can be up to 412.5 psi. These flanges have the same outside diameter and drilling pattern as ASME B16.1 Class 125 cast-iron flanges. In sizes 24″ and smaller, they also match ASME …

Technical Drawing The working pressure limit at water service temperature for AWWA C207 Class D blind flange is 175 psi [1207 kPa] for NPS ≤ 12″ and 150 psi [1034 kPa] for NPS ＞ 12″. The maximum pressure (test or transient) for the Class D blind flange up to 12″ is 260 psi; The maximum pressure (test or transient) for …

Technical Drawing The working pressure limit at water service temperature for AWWA C207 Class B blind flange is 86 psi. These flanges have the same outside diameter and drilling pattern as Class 125 cast-iron flanges (ASME B16.1). In sizes 24″ and smaller, they also match ASME B16.5 Class 150-psi drilling for steel flanges. The maximum pressure (test or transient) for …

Technical Drawing The AWWA C207 Class E steel ring flanges (S/O plate flanges) are available in sizes 4″ through 48″. These flanges have the same OD and drilling pattern as Class 250 cast-iron flanges (ASME B16.1). In sizes 24″ and smaller, they also match ASME B16.5 Class 300 drilling for steel flanges. Dimensions & Masses *A: OD of flange; B: …

Technical Drawing The AWWA C207 Class E steel ring flanges (S/O plate flanges) are available in sizes 4″ through 144″. These flanges have the same OD and drilling pattern as Class 125 cast-iron flanges (ASME B16.1). In sizes 24″ and smaller, they also match ASME B16.5 Class 150 drilling for steel flanges. Dimensions & Masses *A: OD of flange; B: …

Technical Drawing The AWWA C207 Class D steel ring flanges are available in sizes 4″ through 144″. These flanges have the same OD and drilling pattern as Class 125 cast-iron flanges (ASME B16.1). In sizes 24″ and smaller, they also match ASME B16.5 Class 150 drilling for steel flanges. The maximum pressure (test or transient) allowed can be up to …

Technical Drawing The AWWA C207 Class B steel ring flanges are available in sizes 4″ through 144″. These flanges have the same OD and drilling pattern as Class 125 cast-iron flanges (ASME B16.1). In sizes 24″ and smaller, they also match ASME B16.5 Class 150 drilling for steel flanges. Dimensions & Masses *A: OD of flange; B: ID of flange; …

General Introduction The AWWA C207  is an American National Standard for steel pipe flanges for waterworks service, sizes 4″ through 144″ (100 mm through 3600 mm). The AWWA is the abbreviation of “American Water Works Association”. The origin of AWWA C207 can be dated back to year 1942 when a paper proposing standards for slip-on steel-ring flanges for welding to …

What is a line blank? A line blank can be viewed as an “isolation flange” inserted between two mating flanges to switch on or off the piping system after disassembling certain flange bolting. In many piping systems, line blanks are usually required to isolate individual pieces of equipment at shutdown and to positively blank off selected process lines at the …

Technical drawings Dimensions *D: outside diameter of flange; K: diameter of bolt circle; G: outside diameter of raised face; X: diameter of hub of  WN flange. All dimensions are in mm units. *A: diameter of hub top of WN; TBL: minimum thickness of blind flange; TWN: minimum thickness of WN flange; Y: length through hub of WN; t: 7mm height …