Orifice Weldneck

Additional Information

Use Custom Product to make a request for dimensions not shown.

1. NOTES: Other NPT sizes may be furnished if required.

2. Weld neck flanges NPS 3 and smaller are identical to Class 600 flanges and may be so marked.

3. All other dimensions are in accordance with ASME/ANSI B16.5

4. Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1-12 and 0.38 in. for NPS 14-24.

5. In conformance with ASME/ANSI B16.5, stud bolt lengths do not include point heights.

6. Bore diameter of weld neck flanges (B1) is to be specified by the purchaser.

Pressure-Temperature Ratings (Class 300)

Metal Temperature F°	Pressurea (Type 304/L & 316/L)
-20 à 100	600
200	505
300	455
400	415
500	380
600	360
650	350
700	345
750	335
800	330
850	320b
900	–
950	–
1000	–

^a  (Pounds per Square Inch Gage)

^b Class 316/L

Dimensional Tolerances

OUTSIDE DIAMETER*	When O.D. is 24” or less	±1/16”
	When O.D. is over 24”	±1/8”
INSIDE DIAMETER*	10” and smaller	±1/32”
	12” through 18”	±1/16”
	20” and larger	+1/8” -1/16”
DIAMETER OF CONTACT FACE	1/16” Raised Face	±1/32”
	1/4” raised Face Tongue and Groove, or Male and Female	±1/64”
DIAMETER OF HUB AT POINT OF WELDING	5” and smaller	+3/32”, -1/32”
	6” and larger	+5/32”, – 1/32”
WELDING BEVEL STANDARDS	See drawings
DIAMETER OF HUB AT BASE*	When Hub Base is 24” or less	±1/16”
	When Hub Base is over 24”	±1/8”
DRILLING	Bolt Circle	±1/16”
	Bolt hole spacing	±1/32”
ECCENTRICITY BOLT CIRCLE & FACING (with respect to Bore*)	2 1/2” and smaller	1/32” max
	3” and larger	1/16” max
LENGTH THRU HUB*	10” and smaller	±1/16”
	12” and larger	±1/8”
THICKNESS	18” and smaller	+1/8” -0”
	20” and larger	+3/16” -0”