How to get high quality ring type joint flanges?

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.

data wnf rjf b16.5 2 - How to get high quality ring type joint flanges?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.

20180122114859 79793 - How to get high quality ring type joint flanges?

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.

rtj wnf 2 - How to get high quality ring type joint flanges?

Standards, Dimensions & Weight

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

  • Dimensions of Ring Joint Facings

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
R17 57.15 6.35 8.74 0.8
R18 60.33 6.35 8.74 0.8
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
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
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
79.5
79.5
81
82.5
1
82.5
90.5
90.5
92
102
102
2
108
2
108
2
114
124
2
121
127
127
133
2
137
Class
150
NPS
Class
300
NPS
Class
400
NPS
Class
600
NPS
Class
900
NPS
Class
1500
NPS
Class
2500
NPS
149
133
3
146
3
146
3
156
3
168
3
154
159
159
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
20180122115147 85849 - How to get high quality ring type joint flanges?
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
4
4
4
4
1
4
4
4
4
3
4
2
6
2
5
2
3
3
2
4
6
5
3
2
3
Class
150
NPS
Class
300
NPS
Class
400
NPS
Class
600
NPS
Class
900
NPS
Class
1500
NPS
Class
2500
NPS
3
4
3
6
3
5
3
4
3
3
3
4
6
5
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.

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.

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°

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 1 - How to get high quality ring type joint flanges?

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. rjf b16 16 47 1 - How to get high quality ring type joint flanges?

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:

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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

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