ASME B16.5 Class 900 RTJ Facing Dimensions

August 28, 2019

Technical Drawings

Figure-1: the ASME B16.5 flange with a ring-type joint (RTJ) facing. P – pitch diameter of groove; G – minimum diameter of raised portion; F – upper width of groove; r – radius at bottom of groove; E – depth of groove, equal to height of raised portion; 23°: slope angle of side wall.

Figure-2: a RTJ joint consisting of two RTJ flanges and a metallic ring gasket which rests in the ring-joint groove. h: approximate distance between flanges. N: groove number.

Figure -3: The stud bolt with two nuts for the connection of two RTJ flanges. Its length is denoted as L (L does not include the height of the points).

ASME B16.5 Class 900 RTJ Facing Dimensions

NPS	Groove No.	P	E	F
1/2	12	39.67	6.35	8.74
3/4	14	44.45	6.35	8.74
1	16	50.80	6.35	8.74
1-1/4	18	60.33	6.35	8.74
1-1/2	20	68.27	6.35	8.74
2	24	95.25	7.92	11.91
2-1/2	27	107.95	7.92	11.91
3	31	123.83	7.92	11.91
4	37	149.23	7.92	11.91
5	41	180.98	7.92	11.91
6	45	211.12	7.92	11.91
8	49	269.88	7.92	11.91
10	53	323.85	7.92	11.91
12	57	381.00	7.92	11.91
14	62	419.10	11.13	16.66
16	66	469.90	11.13	16.66
18	70	533.40	12.70	19.84
20	74	584.20	12.70	19.84
24	78	692.15	15.88	26.97

*Table 900#-1, all dimensions are in mm.

NPS	r	G	h	L
1/2	0.8	60.5	4	110
3/4	0.8	66.5	4	115
1	0.8	71.5	4	125
1-1/4	0.8	81.0	4	125
1-1/2	0.8	92.0	4	140
2	0.8	124	3	145
2-1/2	0.8	137	3	160
3	0.8	156	4	145
4	0.8	181	4	170
5	0.8	216	4	190
6	0.8	241	4	195
8	0.8	308	4	220
10	0.8	362	4	235
12	0.8	419	4	255
14	1.5	467	4	280
16	1.5	524	4	290
18	1.5	594	5	335
20	1.5	648	5	360
24	2.4	772	6	455

*Table 900#-2, all dimensions are in mm.

RTJ Facings for ASME B16.5 Flanges in Classes
150#	300#	400#	600#
900#	1500#	2500#	-

*Click to view the RTJ facing dimensions for pressure rating Class 150 through Class 2500.

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