How to get high quality ring type joint flanges?

2018-01-24

What is a ring type joint flange?

Ring Type Joint Flange is a method of ensuring leak proof flange connection at high pressures. A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal. This jointing method can be employed on Weld Neck, Slip-on and Blind Flange. The flanges seal when the bolts are tightened and the gasket is compressed into the groove making a metal to metal seal. An RTJ flange usually has a raised face with the groove machined into the face of the flange. The raised face doesn’t serve as a way to contain the pressure.

Table of Contents hide

1 What is a ring type joint flange?

2 Design Considerations

3 Ring Type Joint Flanges (RTJ) or Ring Joint Facing Flanges (R-JF):

4 Standards, Dimensions & Weight

4.1 Dimensions Ring-Joint Facings -ASME B16.5- Pressure Class 150

5 Ring Type Joint gaskets

6 Specifications of Ring Type Joint Flange:

7 Material:

RTJ Flanges are used for high pressure applications up to pressures as high as 15,000 psi (103 MPa). It is only furnished only on steel or alloy valve bodies and usually need to specified when ordering. The flanges usually come in blind, slip-on, threaded and weld neck.

The benefits of using an RTJ flange and ring is that the gasket is confined to a groove and has two sealing surfaces. The groove assures that the ring centers itself when the bolts are tightened. It also is self actuating meaning that the sealing pressure increases when the process pressure increases.

The disadvantages of using RTJ Flanges is that ring type joint grooves can accumulate dirt or moisture when the flange is open. Since the seal is a metal on metal connection, a small amount of damage on the narrow sealing surface(s) may lead to a leak. Additionally, the grooves and gasket must align properly in order to assemble the flange and obtain a seal. They must stay aligned throughout the operating cycle. This is important if you are flanging up to dissimilar metals like stainless steel to carbon steel flanges.

The Ring Type Joint flanges are typically used in high pressure (Class 600 and higher rating) and/or high temperature services above 800°F (427°C). They have grooves cut into their faces which steel ring gaskets. The flanges seal when tightened bolts compress the gasket between the flanges into the grooves, deforming (or Coining) the gasket to make intimate contact inside the grooves, creating a metal to metal seal.

An RTJ flange may have a raised face with a ring groove machined into it. This raised face does not serve as any part of the sealing means. For RTJ flanges that seal with ring gaskets, the raised faces of the connected and tightened flanges may contact each other. In this case the compressed gasket will not bear additional load beyond the bolt tension, vibration and movement cannot further crush the gasket and lessen the connecting tension.

Design Considerations

When removing the RTJ connection, the flanges must be forcibly separated to release the ring from the groove. Because of this, there needs to be sufficient access for removal of the flanges and removal of the ring.

With the wide acceptance of and significant usage of the spiral wound gasket in high pressure service, RTJ type flanges aren’t as common as raised face flanges. Consideration should be made during the design to ensure that additional rings are available when connections need to be broken.

Ring Type Joint Flanges (RTJ) or Ring Joint Facing Flanges (R-JF):

RTJ flanges have grooves cut into their faces which accept steel Ring Gaskets. RTJ flanges seal when tightened bolts compress the gasket between the flanges into the grooves, deforming (or “Coining”) the gasket to make Intimate Contact inside the grooves, creating a metal to metal seal.
An RTJ flange may have a raised face with a ring groove machined into it.

This raised face does not serve as any part of the sealing means. For RTJ flanges that seal with BX ring gaskets, the raised faces of the connected and tightened flanges may contact each other. In this case the compressed gasket will not bear additional load beyond the bolt tension, vibration and movement cannot further crush the gasket and lessen the connecting tension.

An RTJ flange may have a raised face with a ring groove machined into it. This raised face does not serve as any part of the sealing means.

Standards, Dimensions & Weight

RTJ flanges have grooves cut into their faces which accept steel Ring Gaskets.

Dimensions of Ring Joint Facings

Dimensions Ring-Joint Facings -ASME B16.5- Pressure Class 150

20180122115030 95006 - How to get high quality ring type joint flanges?

Class 150 NPS	Groove No.	Pitch Dia P	Depth E Note (1)	Width F	Radius at bottom R
…	R11	34.14	5.54	7.14	0.8
…	R12	39.67	6.35	8.74	0.8
…	R13	42.88	6.35	8.74	0.8
…	R14	44.45	6.35	8.74	0.8
1	R15	47.63	6.35	8.74	0.8
…	R16	50.8	6.35	8.74	0.8
1¼	R17	57.15	6.35	8.74	0.8
…	R18	60.33	6.35	8.74	0.8
1½	R19	65.07	6.35	8.74	0.8
…	R20	68.27	6.35	8.74	0.8
…	R21	72.23	7.92	11.91	0.8
2	R22	82.55	6.35	8.74	0.8
…	R23	82.55	7.92	11.91	0.8
…	R24	95.25	7.92	11.91	0.8
2½	R25	101.6	6.35	8.74	0.8
…	R26	101.6	7.92	11.91	0.8
…	R27	107.95	7.92	11.91	0.8
…	R28	111.13	9.53	13.49	1.5
3	R29	114.3	6.35	8.74	0.8
…	R30	117.48	7.92	11.91	0.8
…	R31	123.83	7.92	11.91	0.8
…	R32	127	9.53	13.49	1.5
3½	R33	131.78	6.35	8.74	0.8
…	R34	131.78	7.92	11.91	0.8
…	R35	136.53	7.92	11.91	0.8
4	R36	149.23	6.35	8.74	0.8
…	R37	149.23	7.92	11.91	0.8
…	R38	157.18	11.13	16.66	1.5
…	R39	161.93	7.92	11.91	0.8
5	R40	171.45	6.35	8.74	0.8
…	R41	180.98	7.92	11.91	0.8
…	R42	190.5	12.7	19.84	1.5
6	R43	193.68	6.35	8.74	0.8
…	R44	193.68	7.92	11.91	0.8
Class 150 NPS	Groove No.	Pitch Dia P	Depth E Note (1)	Width F	Radius at bottom R
…	R45	211.12	7.92	11.91	0.8
…	R46	211.14	9.53	13.49	1.5
…	R47	228.6	12.7	19.84	1.5
8	R48	247.65	6.35	8.74	0.8
…	R49	269.88	7.92	11.91	0.8
…	R50	269.88	11.13	16.66	1.5
…	R51	279.4	14.27	23.01	1.5
10	R52	304.8	6.35	8.74	0.8
…	R53	323.85	7.92	11.91	0.8
…	R54	323.85	11.13	16.66	1.5
…	R55	342.9	17.48	30.18	2.4
12	R56	381	6.35	8.74	0.8
…	R57	381	7.92	11.91	0.8
…	R58	381	14.27	23.01	1.5
14	R59	396.88	6.35	8.74	0.8
…	R60	406.4	17.48	33.32	2.4
…	R61	419.1	7.92	11.91	0.8
…	R62	419.1	11.13	16.66	1.5
…	R63	419.1	15.88	26.97	2.4
16	R64	454.03	6.35	8.74	0.8
…	R65	469.9	7.92	11.91	0.8
…	R66	469.9	11.13	16.66	1.5
…	R67	469.9	17.48	30.18	2.4
18	R68	517.53	6.35	8.74	0.8
…	R69	533.4	7.92	11.91	0.8
…	R70	533.4	12.7	19.84	1.5
…	R71	533.4	17.48	30.18	2.4
20	R72	558.8	6.35	8.74	0.8
…	R73	584.2	9.53	13.49	1.5
…	R74	584.2	12.7	19.84	1.5
…	R75	584.2	17.48	33.32	2.4
24	R76	673.1	6.35	8.74	0.8
…	R77	692.15	11.13	16.66	1.5
…	R78	692.15	15.88	26.97	2.4
…	R79	692.15	20.62	36.53	2.4
Class 150 NPS	Groove No.	Pitch Dia P	Depth E Note (1)	Width F	Radius at bottom R

NOTES:
(1) The height of the raised portion is equal to the depth of the groove dimension, E, but is not subjected to the tolerances for E. Former full-face contour may be used.
(2) For ring joints with lapped flanges in Classes 300 and 600, ring and groove number R30 is used instead of R31.

20180122115147 85849 - How to get high quality ring type joint flanges?

Diameter of Raised Portion, K
Class 150 NPS	Class 300 NPS	Class 400 NPS	Class 600 NPS	Class 900 NPS	Class 1500 NPS	Class 2500 NPS
…	51 1/2	…	51 1/2	…	…	…
…	…	…	…	…	60.5 1/2	…
…	63.5 3/4	…	63.5 3/4	…	…	65 1/2
…	…	…	…	…	66.5 3/4	…
63.5 1	…	…	…	…	…	…
…	70 1	…	70 1	…	71.5 1	73 3/4
73 1¼	…	…	…	…	…	…
…	79.5 1¼	…	79.5 1¼	…	81 1¼	82.5 1
82.5 1½	…	…	…	…	…	…
…	90.5 1½	…	90.5 1½	…	92 1½	…
…	…	…	…	…	…	102 1¼
102 2	…	…	…	…	…	…
…	108 2	…	108 2	…	…	114 1½
…	…	…	…	…	124 2	…
121 2½	…	…	…	…	…	…
…	127 2½	…	127 2½	…	…	133 2
…	…	…	…	…	137 2½	…
Class 150 NPS	Class 300 NPS	Class 400 NPS	Class 600 NPS	Class 900 NPS	Class 1500 NPS	Class 2500 NPS
…	…	…	…	…	…	149 2½
133 3	…	…	…	…	…	…
…	…	…	…	…	…	…
…	146 3	…	146 3	156 3	…	…
…	…	…	…	…	…	168 3
154 3½	…	…	…	…	…	…
…	159 3½	…	159 3½	…	…	…
…	…	…	…	…	168 3	…
171 4	…	…	…	…	…	…
…	175 4	175 4	175 4	181 4	…	…
…	…	…	…	…	…	203 4
…	…	…	…	…	194 4	…
194 5	…	…	…	…	…	…
…	210 5	210 5	210 5	216 5	…	…
…	…	…	…	…	…	241 5
219 6	…	…	…	…	…	…
…	…	…	…	…	229 5	…
…	241 6	241 6	241 6	241 6	…	…
Class 150 NPS	Class 300 NPS	Class 400 NPS	Class 600 NPS	Class 900 NPS	Class 1500 NPS	Class 2500 NPS
…	…	…	…	…	248 6	…
…	…	…	…	…	…	279 6
273 8	…	…	…	…	…	…
…	302 8	302 8	302 8	308 8	…	…
…	…	…	…	…	318 8	…
…	…	…	…	…	…	340 8
330 10	…	…	…	…	…	…
…	356 10	356 10	356 10	362 10	…	…
…	…	…	…	…	371 10	…
…	…	…	…	…	…	425 10
406 12	…	…	…	…	…	…
…	413 12	413 12	413 12	419 12	…	…
…	…	…	…	…	438 12	…
425 14	…	…	…	…	…	…
…	…	…	…	…	…	495 12
…	457 14	457 14	457 14	…	…	…
…	…	…	…	467 14	…	…
Class 150 NPS	Class 300 NPS	Class 400 NPS	Class 600 NPS	Class 900 NPS	Class 1500 NPS	Class 2500 NPS
…	…	…	…	…	489 14	…
483 16	…	…	…	…	…	…
…	508 16	508 16	508 16	…	…	…
…	…	…	…	524 16	…	…
…	…	…	…	…	546 16	…
546 18	…	…	…	…	…	…
…	575 18	575 18	575 18	…	…	…
…	…	…	…	594 18	…	…
…	…	…	…	…	613 18	…
597 20	…	…	…	…	…	…
…	635 20	635 20	635 20	…	…	…
…	…	…	…	648 20	…	…
…	…	…	…	…	673 20	…
711 24	…	…	…	…	…	…
…	749 24	749 24	749 24	…	…	…
…	…	…	…	772 24	…	…
…	…	…	…	…	794 24	…
Class 150 NPS	Class 300 NPS	Class 400 NPS	Class 600 NPS	Class 900 NPS	Class 1500 NPS	Class 2500 NPS
Diameter of Raised Portion, K

Approximate Distance Between Flanges, X
Class 150 NPS	Class 300 NPS	Class 400 NPS	Class 600 NPS	Class 900 NPS	Class 1500 NPS	Class 2500 NPS
…	3 1/2	…	3 1/2	…	…	…
…	…	…	…	…	4 1/2	…
…	4 3/4	…	4 3/4	…	…	4 1/2
…	…	…	…	…	4 3/4	…
4 1	…	…	…	…	…	…
…	4 1	…	4 1	…	4 1	4 3/4
4 1¼	…	…	…	…	…	…
…	4 1¼	…	4 1¼	…	4 1¼	4 1
4 1½	…	…	…	…	…	…
…	4 1½	…	4 1½	…	4 1½	…
…	…	…	…	…	…	3 1¼
4 2	…	…	…	…	…	…
…	6 2	…	5 2	…	…	3 1½
…	…	…	…	…	3 2	…
4 2½	…	…	…	…	…	…
…	6 2½	…	5 2½	…	…	3 2
…	…	…	…	…	3 2½	…
Class 150 NPS	Class 300 NPS	Class 400 NPS	Class 600 NPS	Class 900 NPS	Class 1500 NPS	Class 2500 NPS
…	…	…	…	…	…	3 2½
4 3	…	…	…	…	…	…
…	…	…	…	…	…	…
…	6 3	…	5 3	4 3	…	…
…	…	…	…	…	…	3 3
4 3½	…	…	…	…	…	…
…	6 3½	…	5 3½	…	…	…
…	…	…	…	…	3 3	…
4 4	…	…	…	…	…	…
…	6 4	6 4	5 4	4 4	…	…
…	…	…	…	…	…	4 4
…	…	…	…	…	3 4	…
4 5	…	…	…	…	…	…
…	6 5	6 5	5 5	4 5	…	…
…	…	…	…	…	…	4 5
4 6	…	…	…	…	…	…
…	…	…	…	…	3 5	…
…	6 6	6 6	5 6	4 6	…	…
Class 150 NPS	Class 300 NPS	Class 400 NPS	Class 600 NPS	Class 900 NPS	Class 1500 NPS	Class 2500 NPS
…	…	…	…	…	3 6	…
…	…	…	…	…	…	4 6
4 8	…	…	…	…	…	…
…	6 8	6 8	5 8	4 8	…	…
…	…	…	…	…	4 8	…
…	…	…	…	…	…	5 8
4 10	…	…	…	…	…	…
…	6 10	6 10	5 10	4 10	…	…
…	…	…	…	…	4 10	…
…	…	…	…	…	…	6 10
4 12	…	…	…	…	…	…
…	6 12	6 12	5 12	4 12	…	…
…	…	…	…	…	5 12	…
3 14	…	…	…	…	…	…
…	…	…	…	…	…	8 12
…	6 14	6 14	5 14	…	…	…
…	…	…	…	4 14	…	…
Class 150 NPS	Class 300 NPS	Class 400 NPS	Class 600 NPS	Class 900 NPS	Class 1500 NPS	Class 2500 NPS
…	…	…	…	…	6 14	…
3 16	…	…	…	…	…	…
…	6 16	6 16	5 16	…	…	…
…	…	…	…	4 16	…	…
…	…	…	…	…	8 16	…
3 18	…	…	…	…	…	…
…	6 18	6 18	5 18	…	…	…
…	…	…	…	5 18	…	…
…	…	…	…	…	8 18	…
3 20	…	…	…	…	…	…
…	6 20	6 20	5 20	…	…	…
…	…	…	…	5 20	…	…
…	…	…	…	…	10 20	…
3 24	…	…	…	…	…	…
…	6 24	6 24	6 24	…	…	…
…	…	…	…	6 24	…	…
…	…	…	…	…	11 24	…
Class 150 NPS	Class 300 NPS	Class 400 NPS	Class 600 NPS	Class 900 NPS	Class 1500 NPS	Class 2500 NPS
Approximate Distance Between Flanges, X

GENERAL NOTES:
(a) Dimensions are in millimeters unless otherwise indicated.
(b) Use Class 600 sizes NPS 1/2 to NPS 3½ for Class 400.
(c) Use Class 1500 in sizes NPS 1/2 to NPS 2½ for Class 900.
(d) Ring joint gasket materials shall conform to ASME B16.20.
(e) The edge (periphery) of each ring joint flange shall be marked with the letter R and the corresponding ring groove number.

TOLERANCES:
E (depth) +0.4 -0.0, F (width) ±0.2, P (pitch diameter) ±0.13, R (radius at bottom)≤ 2 + 0.8 -0.0, > 2 ± 0.8,
23° (angle) ± 1/2°

Ring Joint Facings ASME/ANSI B16.5 & B16.47-1

Ring Joint Facings ASME/ANSI B16.5 & B16.47-2

Ring Joint Facings ASME/ANSI B16.5 & B16.47-3

Ring Joint Facings ASME/ANSI B16.5 & B16.47-4

RTJ flanges seal when tightened bolts compress the gasket between the flanges into the grooves, deforming (or “Coining”) the gasket to make Intimate Contact inside the grooves, creating a metal to metal seal.

Ring Type Joint gaskets

Ring Type Joint gaskets are metallic sealing rings, suitable for high-pressure and high-temperature applications. They are always applied to special, accompanying flanges which ensure good, reliable sealing with the correct choice of profiles and material.

Specifications of Ring Type Joint Flange:

An RTJ flange may have a raised face with a ring groove machined into it. This raised face does not serve as any part of the sealing means. For RTJ flanges that seal with BX ring gaskets, the raised faces of the connected and tightened flanges may contact each other.

In this case the already coined gasket will not bear additional load beyond the bolt tension, vibration and movement cannot further crush the gasket and lessen the connecting tension.
Size: 1/2” to 60”, DN 12mm to DN 1500mm
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250

Standards: ANSI, MSS, API, AWWA, DIN, JIS, BS and GB.
Facing: RF / RTJ>

Material:

Cabon steel: A105, A350 LF2
Stainless steel: A182 F304/F304L/F316/F316L/F321
Alloy steel: F11, F12
Packing: plywood case and plywood pallet

Source: China Ring Type Joint Flanges Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com

Please notice that you might be interested in the other technical articles we’ve published:

References:

https://www.woodcousa.com/q_a-r_29.htm
http://www.piping-designer.com/index.php/disciplines/mechanical/83-stationary-equipment/pipe-flanges/2012-ring-type-joint-flange
http://www.wermac.org/flanges/flanges_raised-face_flat-face_ring-type-joint.html
http://www.wermac.org/flanges/dimensions_ring-joint-facings_flanges_asme-b16.5.html
https://www.yaang.com

+86-18267732328

sales@steeljrv.com

How to get high quality ring type joint flanges?