Dimensions Orifice Weld Neck RTJ flanges ASME B16.36 Class 2500

NPS	Out Side DIA	Min thk Flg	Hgt Flg	Grv NO	Pitch DIA	Grv Depth
	O	T	H		P	E
1	160	38.1	92	R18	60.33	6.35
1.1/2	205	44.5	111	R23	82.55	7.92
2	235	50.8	127	R26	101.60	7.92
2.1/2	265	57.2	143	R28	111.13	9.53
3	305	66.7	168	R32	127.00	9.53
4	355	76.2	190	R38	157.18	11.13
6	485	108.0	273	R47	228.60	12.70
8	550	127.0	318	R51	279.40	14.27
10	675	165.1	419	R55	342.90	17.48
12	760	184.2	464	R60	406.40	17.48

NPS	Grv Width	R Btm	Hgt Oval Ring	Hub DIA	Hub DIA	DIA of Tap
	F	R	W	X	A	Tg
1	8.74	0.8	25.4	57	33.5	6.4
1.1/2	11.91	0.8	27.0	79	48.3	6.4
2	11.91	0.8	27.0	95	60.3	6.4
2.1/2	13.49	1.5	30.2	114	73.0	6.4
3	13.49	1.5	30.2	133	88.9	9.5
4	16.66	1.5	33.3	165	114.3	12.7
6	19.84	1.5	36.5	235	168.3	12.7
8	23.01	1.5	39.7	305	219.1	12.7
10	30.18	2.4	47.6	375	273.0	12.7
12	33.32	2.4	50.8	441	323.8	12.7

NPS	Bolt Circle	NO of Bolts	DIA of Holes	DIA Stud Bolts	Stud Bolt L
1	108.0	4	1	7/8	160
1.1/2	146.0	4	1.1/4	1.1/8	190
2	171.4	8	1.1/8	1	195
2.1/2	196.8	8	1.1/4	1.1/8	215
3	228.6	8	1.3/8	1.1/4	240
4	273.0	8	1.5/8	1.1/2	275
6	368.3	8	2.1/8	2	370
8	438.2	12	2.1/8	2	405
10	539.8	12	2 5/8	2.1/2	515
12	619.1	12	2 7/8	2.3/4	570

General Notes..

• Dimensions are in millimeters, except for bolts and bolt holes.
• All other dimensions are in accordance with ASME B16.5.
• Ring joint flanges larger than NPS 3 will require angular meter taps.

Notes..

• Other NPT sizes may be furnished if required.
• Bolt lengths for raised face flanges include allowance for orifice and gasket thickness
  of 6 mm (0.25 in.) for NPS 1 to NPS 12. Bolt lengths for ring-type joint flanges include
  allowance of 15 mm (0.62 in.) for NPS 1 to NPS 3.
• Bore (B) is to be specified by the purchaser.
• The length of the Stud Bolt does not include the height of the chamfers (points).

Tolerances
Tolerances on all dimensions shall be as shown in ASME B16.5 except for those shown below.

Pressure Tap Location
Tolerance on location of center of pressure tap hole from flange face shall be..

• ±0.5 mm (±0.02 in.) for flanges smaller than NPS 4
• ±0.8 mm (±0.03 in.) for flanges NPS 4 and larger

Bore Diameter

• Bore diameter tolerance (Welding Neck flanges only) is ±0.5% of nominal value.

Studs are measured parallel to the axis (L) from the first to the thread without the chamfers (points). S = free threads equals 1/3 time bolt dia

 

Hex bolts are measured from under the head to the top of de bolt