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Ring Type Joint Flange

RTJ Flange: Specifications | Materials | Types | Dimensions | Weight Chart | Tolerances | FAQ

High-quality ASME B16.5 Ring Type Joint Flanges manufactured and exported in carbon, stainless, alloy, and nickel alloys. Sizes range from ½” to 24” with pressure classes 150–2500. Shipped globally including Canada, Saudi Arabia, Singapore, and Italy.

ASME B16.5 Ring Type Joint Export

Best Export Prices: sales@midlandforgefittings.com

At Midland Forge and Fittings Pvt. Ltd, we are committed to delivering world-class piping components that meet the most demanding industry requirements. With a focus on innovation, precision, and quality assurance, we have established ourselves as a reliable manufacturer and exporter of RTJ flanges for global markets. Our expertise extends across a wide range of materials, allowing us to serve diverse industries with customized solutions.

We pride ourselves on our to provide products that are engineered to international standards while maintaining competitive pricing and timely deliveries. Whether it is for oil & gas, petrochemical, or power generation projects, we are trusted by clients worldwide for supplying products that ensure durability, safety, and performance under critical operating conditions.

A RTJ Flange is a high-pressure flange designed with a machined groove that holds a metal ring gasket, creating a strong and leak-proof seal. These flanges are ideal for applications where high-pressure and high-temperature resistance is essential. RTJ flanges are commonly used in oil refineries, offshore drilling, chemical plants, and power generation systems, where safety and reliability cannot be compromised.

ASME B16.5 RTJ Flanges are manufactured to meet global standards, available in sizes ranging from ½” to 24” and pressure classes from 150# to 2500#. Each flange is crafted with precision, ensuring accurate dimensions, excellent surface finish, and long-lasting performance. By offering RTJ flanges in multiple materials and finishes, we provide clients with tailored solutions that match their project requirements.

ASME B16.5 RTJ Flange

Ring Type Joint Pipe Flange Specifications

Size Range

15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12

Pressure Rating - Class

150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS

Marking

Grade / Material, Size (NPS or DN), Pressure Class (PN), Heat No, Standard, Manufacturer’s Name or Trademark

Face Type / Flange Connection Type

Flat Face (FF), Raise Face (RF), Ring Joint (RJT), Tongue and Groove (T&G), Male and Female (M&F)

Flange Form

RTJ

Manufacturing Standards

ASTM (A105, A182, A350, A694, B564), ASME/ANSI, MSS-SP-44, API 6A.

Materials

Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex, Nickel, Inconel, Incoloy, Hastelloy, Monel, Alloy 20, 254 SMO, Copper Nickel, Titanium.

Test Certificates

EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc

Dimensional Standards

ANSI B16.5, ANSI B16.47, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN, JIS, SABS1123, GOST-12820

Testing

Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector

Flange Coating/Surface Treatment

Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Production technique

Forged, Heat treated and machined
ASME B16.47, MSS SP - 44 RTJ

Ring Type Joint Flange – Materials, Grades & Standards

Material Category Standards / Grades (ASTM / ASME) Pressure Class / Size Range Typical Use / Application
Stainless Steel ASTM A182 F304 / F304L / F304H Class 150 – 2500, Size ½”–48” General purpose, corrosion-resistant piping
ASTM A182 F316 / F316L / F316H Class 150 – 2500, Size ½”–48” Chemical, marine, food & pharma industries
ASTM A182 F321 / F321H Class 150 – 1500, Size ½”–24” High temperature, stabilized service
Carbon Steel ASTM A105 (Forged CS) Class 150 – 2500, Size ½”–48” Pressure piping, oil & gas, general industries
ASTM A350 LF2 (Low Temp CS) Class 150 – 1500, Size ½”–24” Cryogenic & low temperature applications
Alloy Steel ASTM A182 F11 / F22 (Cr-Mo) Class 150 – 2500, Size ½”–24” Power plants, refineries, steam pipelines
ASTM A182 F91 Class 150 – 2500, Size ½”–24” High-temperature, power generation
Duplex / Super Duplex ASTM A182 F51 / F53 / F55 / F60 (UNS S31803 / S32205 / S32750 / S32760) Class 150 – 2500, Size ½”–24” Offshore, seawater, high corrosion service
Nickel Alloys ASTM B564 Inconel 600 / 625 / 718 Class 150 – 2500, Size ½”–24” Heat exchangers, chemical, aerospace
ASTM B564 Monel 400 / K500 Class 150 – 2500, Size ½”–24” Marine, seawater handling, pumps
Copper Nickel ASTM B151 / B467 (Cu-Ni 90/10, 70/30) Class 150 – 600, Size ½”–24” Shipbuilding, desalination, seawater systems
Titanium ASTM B381 Gr. 2 / Gr. 5 Class 150 – 600, Size ½”–12” Aerospace, seawater, lightweight piping
Aluminium ASTM B247 6061 / 5083 Class 150 – 300, Size ½”–12” Lightweight, non-corrosive, low-pressure piping
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ANSI/ASME B16.5 Class 150 RTJ Flange – Dimensions & Sizes in mm

Dimensions of ANSI/ASME B16.5 RTJ Flanges
Size in
Inch		 Size in
mm		 Outer
Dia.		 Flange
Thickness		 Hub
OD		 Weld Neck
OD		 Welding Neck
Length		 RTJ RF Dia RTJ RF Height PCD RTJ Pitch
dia		 RTJ
Depth		 RTJ
Width		 Bore
A B C D E F G H I J K L
1/2 15 90 9.6 30 21.3 46 N/A N/A 60.3 N/A N/A N/A Welding Neck bore is derived from the pipe schedule
3/4 20 100 11.2 38 26.7 51 N/A N/A 69.9 N/A N/A N/A
1 25 110 12.7 49 33.4 54 63.5 6.35 79.4 47.63 6.35 8.74
1 1/4 32 115 14.3 59 42.2 56 73 6.35 88.9 57.15 6.35 8.74
1 1/2 40 125 15.9 65 48.3 60 82.5 6.35 98.4 65.07 6.35 8.74
2 50 150 17.5 78 60.3 62 102 6.35 120.7 82.55 6.35 8.74
2 1/2 65 180 20.7 90 73 68 121 6.35 139.7 101.6 6.35 8.74
3 80 190 22.3 108 88.9 68 133 6.35 152.4 114.3 6.35 8.74
3 1/2 90 215 22.3 122 101.6 70 154 6.35 177.8 131.78 6.35 8.74
4 100 230 22.3 135 114.3 75 171 6.35 190.5 149.23 6.35 8.74
5 125 255 22.3 164 141.3 87 194 6.35 215.9 171.45 6.35 8.74
6 150 280 23.9 192 168.3 87 219 6.35 241.3 193.68 6.35 8.74
8 200 345 27 246 219.1 100 273 6.35 298.5 247.65 6.35 8.74
10 250 405 28.6 305 273 100 330 6.35 362 304.8 6.35 8.74
12 300 485 30.2 365 323.8 113 406 6.35 431.8 381 6.35 8.74
14 350 535 33.4 400 355.6 125 425 6.35 476.3 396.88 6.35 8.74
16 400 595 35 457 406.4 125 483 6.35 539.8 454.03 6.35 8.74
18 450 635 38.1 505 457.2 138 546 6.35 577.9 517.53 6.35 8.74
20 500 700 41.3 559 508 143 597 6.35 635 558.8 6.35 8.74
24 600 815 46.1 663 610 151 711 6.35 749.3 673.1 6.35 8.74

ANSI/ASME B16.5 Class 300 RTJ Flange – Dimensions & Sizes in mm

Size in
Inch		 Size in
mm		 Outer
Dia.		 Flange
Thickness		 Hub
OD		 Weld Neck
OD		 Welding Neck
Length		 RTJ RF
Dia		 RTJ RF
Height		 PCD RTJ Pitch
dia		 RTJ
Depth		 RTJ
Width		 Bore
A B C D E F G H I J K L
1/2 15 95 12.7 38 21.3 51 51 5.54 66.7 34.14 5.54 7.14 Welding Neck bore is derived from the pipe schedule
3/4 20 115 14.3 48 26.7 56 63.5 6.35 82.6 42.88 6.35 8.74
1 25 125 15.9 54 33.4 60 70 6.35 88.9 50.8 6.35 8.74
1 1/4 32 135 17.5 64 42.2 64 79.5 6.35 98.4 60.33 6.35 8.74
1 1/2 40 155 19.1 70 48.3 67 90.5 6.35 114.3 68.27 6.35 8.74
2 50 165 20.7 84 60.3 68 108 7.92 127 82.55 7.92 11.91
2 1/2 65 190 23.9 100 73 75 127 7.92 149.2 101.6 7.92 11.91
3 80 210 27 117 88.9 78 146 7.92 168.3 123.83 7.92 11.91
3 1/2 90 230 28.6 133 101.6 79 159 7.92 184.2 131.78 7.92 11.91
4 100 255 30.2 146 114.3 84 175 7.92 200 149.23 7.92 11.91
5 125 280 33.4 178 141.3 97 210 7.92 235 180.98 7.92 11.91
6 150 320 35 206 168.3 97 241 7.92 269.9 211.12 7.92 11.91
8 200 380 39.7 260 219.1 110 302 7.92 330.2 269.88 7.92 11.91
10 250 445 46.1 321 273 116 356 7.92 387.4 323.85 7.92 11.91
12 300 520 49.3 375 323.8 129 413 7.92 450.8 381 7.92 11.91
14 350 585 52.4 425 355.6 141 457 7.92 514.4 419.1 7.92 11.91
16 400 650 55.6 483 406.4 144 508 7.92 571.5 469.9 7.92 11.91
18 450 710 58.8 533 457 157 575 7.92 628.6 533.4 7.92 11.91
20 500 775 62 587 508 160 635 9.53 685.8 584.2 9.53 13.49
24 600 915 68.3 702 610 167 749 11.13 812.8 692.15 11.13 16.66

ANSI/ASME B16.5 Class 400 RTJ Flange – Dimensions & Sizes in mm

Size in
Inch		 Size in
mm		 Outer
Dia.		 Flange
Thickness		 Hub
OD		 Weld Neck
OD		 Welding Neck
Length		 RTJ RF
Dia		 RTJ RF
Height		 PCD RTJ Pitch
dia		 RTJ
Depth		 RTJ
Width		 Bore
A B C D E F G H I J K L
1/2 15 95 14.3 38 21.3 52 51 5.54 66.7 34.14 5.54 7.14 Welding Neck bore is derived from the pipe schedule
3/4 20 115 15.9 48 26.7 57 63.5 6.35 82.6 42.88 6.35 8.74
1 25 125 17.5 54 33.4 62 70 6.35 88.9 50.8 6.35 8.74
1 1/4 32 135 20.7 64 42.2 67 79.5 6.35 98.4 60.33 6.35 8.74
1 1/2 40 155 22.3 70 48.3 70 90.5 6.35 114.3 68.27 6.35 8.74
2 50 165 25.4 84 60.3 73 108 7.92 127 82.55 7.92 11.9
2 1/2 65 190 28.6 100 73 79 127 7.92 149.2 101.6 7.92 11.9
3 80 210 31.8 117 88.9 83 146 7.92 168.3 123.83 7.92 11.9
3 1/2 90 230 35 133 101.6 86 159 7.92 184.2 131.78 7.92 11.9
4 100 255 35 146 114.3 89 175 7.92 200 149.23 7.92 11.91
5 125 280 38.1 178 141.3 102 210 7.92 235 180.98 7.92 11.91
6 150 320 41.3 206 168.3 103 241 7.92 269.9 211.12 7.92 11.91
8 200 380 47.7 260 219.1 117 302 7.92 330 269.88 7.92 11.91
10 250 445 54 321 273 124 356 7.92 387.4 323.85 7.92 11.91
12 300 520 57.2 375 323.8 137 413 7.92 450.8 381 7.92 11.91
14 350 585 60.4 425 355.6 149 457 7.92 514.4 419.1 7.92 11.91
16 400 650 63.5 483 406.4 152 508 7.92 571.5 469.9 7.92 11.91
18 450 710 66.7 533 457 165 575 7.92 628.6 533.4 7.92 11.91
20 500 775 69.9 587 508 168 635 9.53 685.8 584.2 9.53 13.49
24 600 915 76.2 702 610 175 749 11.13 812.8 692.15 11.13 16.66

ANSI/ASME B16.5 Class 600 RTJ Flange – Dimensions & Sizes in mm

Size in
Inch		 Size in
mm		 Outer
Dia.		 Flange
Thickness		 Hub
OD		 Weld Neck
OD		 Welding Neck
Length		 RTJ RF
Dia		 RTJ RF
Height		 PCD RTJ Pitch
dia		 RTJ
Depth		 RTJ
Width		 Bore
A B C D E F G H I J K L
1/2 15 95 14.3 38 21.3 52 51 5.54 66.7 34.14 5.54 7.14 Welding Neck bore is derived from the pipe schedule
3/4 20 115 15.9 48 26.7 57 63.5 6.35 82.6 42.88 6.35 8.74
1 25 125 17.5 54 33.4 62 70 6.35 88.9 50.8 6.35 8.74
1 1/4 32 135 20.7 64 42.2 67 79.5 6.35 98.4 60.33 6.35 8.74
1 1/2 40 155 22.3 70 48.3 70 90.5 6.35 114.3 68.27 6.35 8.74
2 50 165 25.4 84 60.3 73 108 7.92 127 82.55 7.92 11.91
2 1/2 65 190 28.6 100 73 79 127 7.92 149.2 101.6 7.92 11.91
3 80 210 31.8 117 88.9 83 146 7.92 168.3 123.83 7.92 11.91
3 1/2 90 230 35 133 101.6 86 159 7.92 184.2 131.78 7.92 11.91
4 100 275 38.1 152 114.3 102 175 7.92 215.9 149.23 7.92 11.91
5 125 330 44.5 189 141.3 114 210 7.92 266.7 180.98 7.92 11.91
6 150 355 47.7 222 168.3 117 241 7.92 292.1 211.12 7.92 11.91
8 200 420 55.6 273 219.1 133 302 7.92 349.2 269.88 7.92 11.91
10 250 510 63.5 343 273 152 356 7.92 431.8 323.85 7.92 11.91
12 300 560 66.7 400 323.8 156 413 7.92 489 381 7.92 11.91
14 350 605 69.9 432 355.6 165 457 7.92 527 419.1 7.92 11.91
16 400 685 76.2 495 406.4 178 508 7.92 603.2 469.9 7.92 11.91
18 450 745 82.6 546 457 184 575 7.92 654 533.4 7.92 11.91
20 500 815 88.9 610 508 190 635 9.53 723.9 584.2 9.53 13.49
24 600 940 101.6 718 610 203 749 11.13 838.2 692.15 11.13 16.66

ANSI/ASME B16.5 Class 900 RTJ Flange – Dimensions & Sizes in mm

Size in
Inch		 Size in
mm		 Outer
Dia.		 Flange
Thickness		 Hub
OD		 Weld Neck
OD		 Welding Neck
Length		 RTJ RF
Dia		 RTJ RF
Height		 PCD RTJ Pitch
dia		 RTJ
Depth		 RTJ
Width		 Bore
A B C D E F G H I J K L
1/2 15 120 22.3 38 21.3 60 60.5 6.35 82.6 39.67 6.35 8.74 Welding Neck bore is derived from the pipe schedule
3/4 20 130 25.4 44 26.7 70 66.5 6.35 88.9 44.45 6.35 8.74
1 25 150 28.6 52 33.4 73 71.5 6.35 101.6 50.8 6.35 8.74
1 1/4 32 160 28.6 64 42.2 73 81 6.35 111.1 60.33 6.35 8.74
1 1/2 40 180 31.8 70 48.3 83 92 6.35 123.8 68.27 6.35 8.74
2 50 215 38.1 105 60.3 102 124 7.92 165.1 95.25 7.92 11.91
2 1/2 65 245 41.3 124 73 105 137 7.92 190.5 107.95 7.92 11.91
3 80 240 38.1 127 88.9 102 156 7.92 190.5 123.83 7.92 11.91
4 100 290 44.5 159 114.3 114 181 7.92 235 149.23 7.92 11.91
5 125 350 50.8 190 141.3 127 216 7.92 279.4 180.98 7.92 11.91
6 150 380 55.6 235 168.3 140 241 7.92 317.5 211.12 7.92 11.91
8 200 470 63.5 298 219.1 162 308 7.92 393.7 269.88 7.92 11.91
10 250 545 69.9 368 273 184 362 7.92 469.9 323.85 7.92 11.91
12 300 610 79.4 419 323.8 200 419 7.92 533.4 381 7.92 11.91
14 350 640 85.8 451 355.6 213 467 11.13 558.8 419.1 11.13 16.66
16 400 705 88.9 508 406.4 216 524 11.13 616 469.9 11.13 16.66
18 450 785 101.6 565 457 229 594 12.7 685.8 533.4 12.7 19.84
20 500 855 108 622 508 248 648 12.7 749.3 584.2 12.7 19.84
24 600 1040 139.7 749 610 292 772 15.88 901.7 692.15 15.88 26.97

ANSI/ASME B16.5 Class 1500 RTJ Flange – Dimensions & Sizes in mm

Size in
Inch		 Size in
mm		 Outer
Dia.		 Flange
Thickness		 Hub
OD		 Weld Neck
OD		 Welding Neck
Length		 RTJ RF
Dia		 RTJ RF
Height		 PCD RTJ Pitch
dia		 RTJ
Depth		 RTJ
Width		 Bore
A B C D E F G H I J K L
1/2 15 120 22.3 38 21.3 60 60.5 6.35 82.6 39.67 6.35 8.74 Welding Neck bore is derived from the pipe schedule
3/4 20 130 25.4 44 26.7 70 66.5 6.35 88.9 44.45 6.35 8.74
1 25 150 28.6 52 33.4 73 71.5 6.35 101.6 50.8 6.35 8.74
1 1/4 32 160 28.6 64 42.2 73 81 6.35 111.1 60.33 6.35 8.74
1 1/2 40 180 31.8 70 48.3 83 92 6.35 123.8 68.27 6.35 8.74
2 50 215 38.1 105 60.3 102 124 7.92 165.1 95.25 7.92 11.91
2 1/2 65 245 41.3 124 73 105 137 7.92 190.5 107.95 7.92 11.91
3 80 265 47.7 133 88.9 117 168 7.92 203.2 136.53 7.92 11.91
4 100 310 54 162 114.3 124 194 7.92 241.3 161.93 7.92 11.91
5 125 375 73.1 197 141.3 156 229 7.92 292.1 193.68 7.92 11.91
6 150 395 82.6 229 168.3 171 248 9.53 317.5 211.14 9.53 13.49
8 200 485 92.1 292 219.1 213 318 11.13 393.7 269.88 11.13 16.66
10 250 585 108 368 273 254 371 11.13 482.6 323.85 11.13 16.66
12 300 675 123.9 451 323.8 283 438 14.27 571.5 381 14.27 23.01
14 350 750 133.4 495 355.6 298 489 15.88 635 419.1 15.88 26.97
16 400 825 146.1 552 406.4 311 546 17.48 704.8 469.9 17.48 30.18
18 450 915 162 597 457 327 613 17.48 774.7 533.4 17.48 30.18
20 500 985 177.8 641 508 356 673 17.48 831.8 584.2 17.48 33.32
24 600 1170 203.2 762 610 406 794 20.62 990.6 692.15 20.62 36.53

ANSI/ASME B16.5 Class 2500 RTJ Flange – Dimensions & Sizes in mm

Size in
Inch		 Size in
mm		 Outer
Dia.		 Flange
Thickness		 Hub
OD		 Weld Neck
OD		 Welding Neck
Length		 RTJ RF
Dia		 RTJ RF
Height		 PCD RTJ Pitch
dia		 RTJ
Depth		 RTJ
Width		 Bore
A B C D E F G H I J K L
1/2 15 135 30.2 43 21.3 73 65 6.35 88.9 42.88 6.35 8.74 Welding Neck bore is derived from the pipe schedule
3/4 20 140 31.8 51 26.7 79 73 6.35 95.2 50.8 6.35 8.74
1 25 160 35 57 33.4 89 82.5 6.35 108 60.33 6.35 8.74
1 1/4 32 185 38.1 73 42.2 95 102 7.92 130.2 72.23 7.92 11.91
1 1/2 40 205 44.5 79 48.3 111 114 7.92 146 82.55 7.92 11.91
2 50 235 50.9 95 60.3 127 133 7.92 171.4 101.6 7.92 11.91
2 1/2 65 265 57.2 114 73 143 149 9.53 196.8 111.13 9.52 13.49
3 80 305 66.7 133 88.9 168 168 9.53 228.6 127 9.52 13.49
4 100 355 76.2 165 114.3 190 203 11.13 273 157.18 11.13 16.66
5 125 420 92.1 203 141.3 229 241 12.7 323.8 190.5 12.7 19.84
6 150 485 108 235 168.3 273 279 12.7 368.3 228.6 12.7 19.84
8 200 550 127 305 219.1 318 340 14.27 438.2 279.4 14.27 23.01
10 250 675 165.1 375 273 419 425 17.48 539.8 342.9 17.48 30.18
12 300 760 184.2 441 323.8 464 495 17.48 619.1 406.4 17.48 33.32

RTJ Piping Flange Weight Chart (lbs) – Pressure Class 150 to 2500

Nominal Pipe Size (NPS) 150# 300# 400# 600# 900# 1500# 2500#
½” 3.5 4.5 5.5 6.5 8.0 10.0 15.5
¾” 4.5 6.0 7.5 9.0 12.0 16.0 22.5
1” 6.0 7.5 9.5 12.0 16.0 21.5 31.5
1¼” 7.5 10.0 12.5 16.0 22.0 29.0 44.0
1½” 9.0 12.5 15.5 20.5 28.0 38.5 58.0
2” 12.0 17.5 21.5 28.0 40.0 55.0 85.0
2½” 16.0 24.0 29.0 38.0 55.0 75.0 115.0
3” 20.5 31.5 38.0 50.0 72.0 98.0 150.0
4” 28.0 44.0 53.0 70.0 100.0 135.0 210.0
5” 38.0 58.0 70.0 92.0 135.0 185.0 290.0
6” 50.0 78.0 95.0 125.0 185.0 250.0 400.0
8” 85.0 135.0 165.0 215.0 310.0 420.0 670.0
10” 125.0 200.0 240.0 310.0 450.0 610.0 975.0
12” 185.0 290.0 350.0 450.0 670.0 900.0 1450.0
14” 215.0 340.0 415.0 535.0 800.0 1080.0 1750.0
16” 310.0 480.0 580.0 750.0 1100.0 1500.0 2450.0
18” 350.0 550.0 665.0 860.0 1275.0 1730.0 2850.0
20” 420.0 670.0 810.0 1045.0 1550.0 2100.0 3450.0
24” 610.0 975.0 1175.0 1525.0 2275.0 3075.0 5050.0

RTJ Flange Tolerances as per ANSI / ASME B16.5, 16.47

Parameter Tolerance
Groove Depth ±0.2 mm (±0.008 in)
Groove Width +0.18 mm / -0.0 mm (+0.007 / -0.000 in)
Groove Radius ±0.4 mm (±0.016 in)
Groove Finish (Roughness Ra) 63–125 µin (1.6–3.2 µm)
Flange Thickness ≤ 10 in (250 mm) ±1.5 mm (±0.06 in)
Flange Thickness 10–24 in ±3.0 mm (±0.12 in)
Flange Thickness > 24 in ±4.0 mm (±0.16 in)
Bolt Circle Diameter ±1.5 mm (±0.06 in)
Bolt Hole Diameter +1.0 mm / 0.0 mm (+0.04 in / -0.00 in)
Bolt Hole Alignment Max offset 1.5 mm (0.06 in); holes must straddle flange centerline
Outside Diameter (OD) ≤ 24 in ±1.5 mm (±0.06 in)
Outside Diameter (OD) > 24 in ±3.0 mm (±0.12 in)
Groove Concentricity to Bore ±0.8 mm (±0.03 in)
Groove Flatness / Alignment Max 0.2 mm (0.008 in)
Raised Face (if applicable) Flat within 0.4 mm (0.016 in) across diameter
Bevel Angle (Weld Neck RTJ) 37.5° ± 2.5°
Root Face (Weld Neck RTJ) 1.6 mm ± 0.8 mm
What are the different gasket types used in RTJ Flanges?

RTJ flanges require special precision-machined gaskets, categorized as:

  1. R-Type Ring Gasket
    • Available in oval or octagonal cross-section.
    • Used in pressures up to 5000 psi.
    • Most common type for standard RTJ connections.
  2. RX-Type Ring Gasket
    • Pressure-energized design.
    • Provides tighter sealing under higher pressure than R-type.
    • Can handle up to 15,000 psi.
  3. BX-Type Ring Gasket
    • Specially designed for very high pressures (up to 20,000 psi).
    • Provides metal-to-metal sealing without leakage.
    • Common in subsea and high-pressure drilling equipment.
  • Sealing Method:
    • RTJ uses a metal gasket in a groove.
    • RF uses soft/semi-metallic gaskets like spiral wound.
    • FF uses full face gaskets for low-pressure service.
  • Applications:
    • RTJ = High pressure & temperature.
    • RF = Medium pressure & temperature.
    • FF = Low pressure, water systems, and cast iron equipment.
  • Reliability:
    • RTJ is the most secure for critical leak-proof operations.

RTJ flanges are preferred because they:

  1. Minimize the risk of hazardous leaks in pipelines.
  2. Provide reliable performance under cyclic loading (pressure and temperature fluctuations).
  3. Ensure safety compliance with oil & gas industry standards.
  4. Reduce downtime with reusable flange bodies.
  5. Improve system integrity, making them the best choice for offshore and subsea projects.
United Arab Emirates (UAE), Saudi Arabia, Oman, Qatar, Kuwait, Bahrain, Iraq, Jordan, Lebanon, Yemen, Iran, Israel, Germany, United Kingdom (UK), Italy, France, Spain, Netherlands, Myanmar, Singapore, Malaysia, Indonesia, Vietnam, South Korea, Philippines, Thailand, Bangladesh, Sri Lanka, Papua New Guinea, United States (USA), Canada, Brazil, Chile, Argentina, Colombia, Russia, Ukraine, Kazakhstan, Poland, Egypt, Algeria, Morocco, Tunisia, Libya, Nigeria, Ghana, Ivory Coast, Senegal, Cameroon, Gabon, Democratic Republic of Congo, Kenya, Tanzania, Uganda, Ethiopia, Rwanda, Zambia, South Africa, Mozambique, Namibia, Botswana