Dimensions Orifice Weld Neck RTJ flanges ASME B16.36 Class 900

NPS	Out Side DIA	Min thk Flg	Hgt Flg	Grv NO	Pitch DIA	Grv Depth
	O	T	H		P	E
1	125	36.6	81	R16	50.80	6.35
1.1/2	155	36.6	84	R20	68.27	6.35
2	165	36.6	84	R23	82.55	7.92
2.1/2	190	36.6	87	R26	101.60	7.92
3	240	38.1	102	R31	123.83	7.92
4	290	44.5	114	R37	149.23	7.92
6	380	55.6	140	R45	211.12	7.92
8	470	63.5	162	R49	269.88	7.92
10	545	69.9	184	R53	323.85	7.92
12	610	79.4	200	R57	381.00	7.92
14	640	85.8	213	R62	419.10	11.13
16	705	88.9	216	R66	469.90	11.13
18	785	101.6	229	R70	533.40	12.70
20	855	108.0	248	R74	584.20	12.70
24	1040	139.7	292	R78	692.15	15.88

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	54	33.5	6.4
1.1/2	8.74	0.8	25.4	70	48.3	6.4
2	11.91	0.8	27.0	84	60.3	6.4
2.1/2	11.91	0.8	27.0	100	73.0	6.4
3	11.91	0.8	27.0	127	88.9	9.5
4	11.91	0.8	27.0	159	114.3	12.7
6	11.91	0.8	27.0	235	168.3	12.7
8	11.91	0.8	27.0	298	219.1	12.7
10	11.91	0.8	27.0	368	273.0	12.7
12	11.91	0.8	27.0	419	323.8	12.7
14	16.66	1.5	33.3	451	355.6	12.7
16	16.66	1.5	36.5	508	406.4	12.7
18	19.84	1.5	39.7	565	457.2	12.7
20	19.84	1.5	39.7	622	508.0	12.7
24	26.97	2.4	47.6	749	609.6	12.7

NPS	Bolt Circle	NO of Bolts	DIA of Holes	DIA Stud Bolts	Stud Bolt L
1	88.9	4	3/4	5/8	140
1.1/2	114.3	4	7/8	3/4	140
2	127.0	8	3/4	5/8	140
2.1/2	149.2	8	7/8	3/4	145
3	190.5	8	1	7/8	165
4	235.0	8	1.1/4	1.1/8	190
6	317.5	12	1.1/4	1.1/8	210
8	393.7	12	1.1/2	13/8	240
10	469.9	16	1.1/2	13/8	255
12	533.4	20	1.1/2	13/8	275
14	558.8	20	1.5/8	1.1/2	290
16	616.0	20	1.3/4	1.5/8	305
18	685.8	20	2	17/8	350
20	749.3	20	2.1/8	2	375
24	901.7	20	25/8	2.1/2	470

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 12 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 3 to NPS 12 and 10 mm (0.38 in.) for NPS 14 to NPS 24.
  Bolt lengths for ring-type joint flanges include allowance of 15 mm (0.62 in.) for NPS 3 to NPS 10
  and 19 mm (0.75 in.) for NPS 12.
• 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