Series A Weldneck MSS-SP-44

Additional Information

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

Necks are furnished machined all over.

Unless otherwise specified, Class 300 Seamless Long Weld Necks will be furnished drilled and with a 0.06” raised face which is included in thickness “C” and Length “Y”.

 

Pressure-Temperature Ratings for Plant Piping and Pressure Vessel Flanges (Class 300)

Metal Temperature F°	Pressureb (Pounds per Square Inch Gage)
100	740
200	675
300	655
400	635
500	600
600	550
650	535
700	535
750	505
800	410
850	270
900	170
950	105
1000c	50

^a Based on the pressure ratings in ANSI B16.5 (1977), for use with flanges designed in accordance with the ASME Code or ANSI B31.1.

^b Pressure-temperature ratings are based on material specifications ASTM A105 and A216 Grade WCB. Limitations on the use of these materials shall be in accordance with the applicable code. 

^c Maximum service temperature for the current class. 

 

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”