ANSI/ASME B16.36 class 300 welding neck orifice flange

Orifice flange is used to measure the flow rate of the liquids in a piping system,it could be water,gas or other liquids.The orifice flanges are usually used with the orifice plates or meters in the pipe joints.Orifice flanges are manufactured to ANSI/ASME B16.36 standard in multiple size and material grades.In ANSI/ASME B16.36 class 300 there are three types of orifice flange:welding neck orifice flange,slip on orifice flange and threaded orifice flange.And the sealing face of orifice flange can be raised face(RF) or ring type joint(RTJ).

ANSI/ASME B16.36 welding neck orifice flange

Dimensions of ANSI/ASME B16.36 class 300 welding neck orifice flange:

ANSI ASME B16.36 welding neck orifice flange

Nominal pipe size	Outside diameter of raised face	Outside diameter of flange	Thickness of flange,min	Length through hub	Diameter of hub	Hub diameter beginning of chamfer	Bore	Diameter of pressure connection	Drilling Template				Bolt length[3][4]
	R	O	tf	Y1	X	A	To be specified by purchaser	TT	Bolt circle	Number of holes	Diameter of holes	Diameter of bolts	Machine bolts	Stud bolts
1	50.8	125	36.6	81	54	33.4		6.4	88.9	4	1 1/16	5/8	115	125
1½	73.0	155	36.6	84	70	48.3		6.4	114.3	4	1 3/16	3/4	120	135
2	92.1	165	36.6	84	84	60.3		6.4	127.0	8	1 1/16	5/8	115	125
2½	104.8	190	36.6	87	100	73.0		6.4	149.2	8	1 3/16	3/4	120	135
3	127.0	210	36.6	87	117	88.9		9.5	168.3	8	1 3/16	3/4	120	135
4	157.2	255	36.6	90	146	114.3		12.7	200.0	8	1 3/16	3/4	120	135
6	215.9	320	36.6	98	206	168.3		12.7	269.9	12	7/8	3/4	120	135
8	269.9	380	39.7	110	260	219.1		12.7	330.2	12	1	7/8	125	145
10	323.8	445	46.1	116	321	273.0		12.7	387.4	16	1 1/8	1	145	165
12	381.0	520	49.3	129	375	323.8		12.7	450.8	16	1 1/4	1 1/8	160	180
14	412.8	585	52.4	141	425	355.6		12.7	514.4	20	1 1/4	1 1/8	165	185
16	469.9	650	55.6	144	483	406.4		12.7	571.5	20	1 3/8	1 1/4	180	195
18	533.4	710	58.8	157	533	457.0		12.7	628.6	24	1 3/8	1 1/4	185	205
20	584.2	775	62.0	160	587	508.0		12.7	685.8	24	1 3/8	1 1/4	190	215
24	692.2	915	68.3	167	702	610.0		12.7	812.8	24	1 5/8	1 1/2	210	240

General notes:

• (a) Dimensions are in millimeters, except for bolts and bolt holes. Reference Mandatory Appendix I for U.S. Customary.
• (b) Weld neck flanges NPS 3 and smaller are identical to Class 600 flanges and may be so marked.
• (c) All other dimensions are in accordance with ASME B16.5.

Notes:

• [1] Other NPT sizes may be furnished if required.
• [2] For slip-on and threaded flanges,verify that TT drilling extends to inside diameter of pipe after assembly and is free from burrs.
• [3] Bolt lengths include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1–12 and 10 mm (0.38 in.) for NPS 14–24.
• [4] In conformance with ASME B16.5,stud bolt lengths do not include point heights.
• [5] Bore diameter of weld neck flanges is to be specified by the purchaser.
• [6] Threaded flanges are furnished in NPS 1-8 only.

Materials of ANSI/ASME B16.36 welding neck orifice flange:

Carbon steel: ASTM A105,A350 LF2,SS400,P235GH,P250GH,C22.8,Q235,20#,16Mn.

Stainless steel: ASTM A182 F304,F304L,F316,F316L,F321,F347,F310,F44,F51 etc.

Alloy steel: ASTM A694 F42,F46,F52,F56,F60,F65,F70,A182 F5,F9,F91,F12,F11,F22 etc.

Haihao Group can provide a variety orifice flange,as follows:

• ANSI/ASME B16.36 class 300 welding neck orifice flange
• ANSI/ASME B16.36 class 300 slip on orifice flange
• ANSI/ASME B16.36 class 300 threaded orifice flange
• ANSI/ASME B16.36 class 400 welding neck RF orifice flange
• ANSI/ASME B16.36 class 400 welding neck RTJ orifice flange
• ANSI/ASME B16.36 class 600 welding neck RF orifice flange
• ANSI/ASME B16.36 class 600 welding neck RTJ orifice flange
• ANSI/ASME B16.36 class 900 welding neck RF orifice flange
• ANSI/ASME B16.36 class 900 welding neck RTJ orifice flange
• ANSI/ASME B16.36 class 1500 welding neck RF orifice flange
• ANSI/ASME B16.36 class 1500 welding neck RTJ orifice flange
• ANSI/ASME B16.36 class 2500 welding neck RF orifice flange
• ANSI/ASME B16.36 class 2500 welding neck RTJ orifice flange

Haihao Group manufacture & supply piping products more than 30 years,which contain seamless steel pipes,welded steel pipes(ERW,SSAW,LASW pipes),butt welding & forged pipe fittings(elbow,tee,reducer,coupling,cap,bend,cross,nipple,outlet,etc) and forged flanges(weld neck flange,blind flange,slip on flange,lap joint flange,threaded flange,socket weld flange,orifice flange,plate flange,etc).If you want to know more about our piping products,please email us:sales@haihaogroup.com