ASME B16.5 Class 2500 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 2500 RTJ Facing Dimensions

NPS	Groove No.	P	E	F
1/2	13	42.88	6.35	8.74
3/4	16	50.80	6.35	8.74
1	18	60.33	6.35	8.74
1-1/4	21	72.23	7.92	11.91
1-1/2	23	82.55	7.92	11.91
2	26	101.60	7.92	11.91
2-1/2	28	111.13	9.53	13.49
3	32	127.00	9.53	13.49
4	38	157.18	11.13	16.66
5	42	190.50	12.70	19.84
6	47	228.60	12.70	19.84
8	51	279.40	14.27	23.01
10	55	342.90	17.48	30.18
12	60	406.40	17.48	33.32

*Table 2500#-1, all dimensions are in mm.

NPS	r	G	h	L
1/2	0.8	65.0	4	120
3/4	0.8	73.0	4	125
1	0.8	82.5	4	140
1-1/4	0.8	102	3	150
1-1/2	0.8	114	3	170
2	0.8	133	3	180
2-1/2	1.5	149	3	205
3	1.5	168	3	230
4	1.5	203	4	260
5	1.5	241	4	310
6	1.5	279	4	355
8	1.5	340	5	395
10	2.4	425	6	510
12	2.4	495	8	560

*Table 2500#-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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