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Flange & Fitting


Standard specifications and technical requirements for various flanges and fittings.

AWWA C207 Class E Hub Flange

Technical Drawing The working pressure limit at water service temperature for AWWA C207 Class E hub flange is 275 psi and the maximum pressure (test or transient) allowed can be up to 412.5 psi. The hub flange is a typical slip on flange. If desired by the purchaser, welding neck flanges may be designed and manufactured on this basis. The …

AWWA C207 Class D Hub Flange

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 …

AWWA C207 Class F Blind Flange

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 …

AWWA C207 Class E Blind Flange

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 …

AWWA C207 Class D Blind Flange

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 …

AWWA C207 Class B Blind Flange

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 …

AWWA C207 Class F Ring Flange

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: …

AWWA C207 Class E Ring Flange

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: …

AWWA C207 Class D Ring Flange

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 …

AWWA C207 Class B Ring Flange

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; …

AWWA C207 Steel Pipe Flanges

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 …

ASME B16.48 Line Blanks

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 …

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