Ring Type Joint Flanges | ASME B16.5 | API 6A

PM Industries manufactures, supplies, and stocks Ring Type Joint Flanges (RTJ flanges) in a range of materials, pressure classes, and pipe sizes. A ring type joint flange has a precision-machined groove cut into the sealing face, sized to accept a solid metal ring gasket. When the flanges are bolted together, the ring gasket is compressed into the grooves on both mating faces, deforming slightly to conform to the groove geometry and producing a metal-to-metal seal. There's no elastomeric or semi-metallic gasket material in the joint. The seal is steel against steel, or ring material against flange groove material.

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That metal-to-metal sealing mechanism is what makes RTJ flanges the standard choice for the highest-pressure and highest-temperature service conditions in the oil and gas industry. Spiral wound and graphite-filled gaskets perform well across a wide service range, but at the upper pressure and temperature limits, particularly in pressure classes 900, 1500, and 2500 and in elevated temperature service above approximately 400°C, the metal ring joint provides a level of sealing integrity that soft-faced gasket systems can't consistently match.

Ring gasket material selection is a critical part of the RTJ system specification. The gasket ring must be softer than the flange groove to ensure the ring deforms into the groove rather than deforming the groove. Soft iron rings are used with carbon steel flanges in standard service. Stainless steel rings are used for corrosive service conditions. For sour gas service to NACE MR0175, ring material hardness limits apply and must be verified against the specification requirements.

Groove surface finish is the detail that determines RTJ sealing performance. The machined groove must be clean, smooth, and free of radial scratches or tool marks that would provide a leak path across the metal-to-metal contact area. Damage to the groove from improper handling, overtightening, or repeated assembly and disassembly eventually requires the flange to be re-machined or replaced. PM Industries supplies RTJ flanges with groove finish held to applicable API and ASME tolerances.

Reassembly practice affects sealing reliability. RTJ rings are generally single-use components. A ring that has been compressed and removed from service has deformed to the groove geometry of the original flange pair and may not seal reliably if transferred to a different flange. Standard practice in critical service is to replace the ring gasket each time the joint is opened.

RTJ flanges are available with full material certification to ASTM, ASME, API 6A, and applicable specifications including NACE MR0175/ISO 15156 for sour service. Contact PM Industries for flange material, ring gasket material, groove type, pressure class, and pricing.

Specification Ring Type Joint Flange

Standards ANSI/ASME B16.5, B16.48, GOST, DIN, EN-1092, B16.47 Series A & B, AWWA, BS Flanges
JIS Standard 5K, 10K, 16K, 20K, 30K, 40K, 63K
DIN Flanges DIN 2527, 2627, 2631, 2656, 2576, 2673, 2629, 2628, 2566

Flanges are Available in Following Materials

Stainless SteelSS 201, SS 202, SS 301, SS 304, SS 304L, SS 310, SS 310S, SS 316L, SS 316TI, SS 317, SS 317L, SS 321, SS 347, SS 409, SS 409M, SS 409L, SS 410, SS 410S, SS 420, SS 430, SS 431, SS 441, SS 444, SS 446, SS 17-4PH, SS 904L.
Duplex SteelUNS S32205, UNS S31803 Flange
Super Duplex SteelUNS S32750, UNS S32760 Flanges
Carbon SteelCarbon steel A105 Flanges, A36 Flanges, IS 2062 Flanges, A350 LF2 Flanges, F42 Flanges, F52 Flanges, F56 Flanges, F60 Flanges, F65 Flanges, F70 Flanges, F80 Flanges, IBR flanges, A694 Flanges, SS400, SF440, ST37-2 Flanges, S235JrG2 Flanges, P250GH Flanges, C22.8 Flanges, etc.
Alloys SteelAlloy 20, F1, F5, F9, F11, F22, F91 Flanges
Copper AlloysCu-Ni 70/30, Cu-Ni 90/10, C 24000, C 75700, C 51100, C 22000, C 27200, C 21000, C 26800, C 52100, C 77000, C 52000, C 11000, C 74500, C 23000, C 28000, C 12200, C 76400, C 51900, C 75400, C 26000, C 51000, C 10200, C 27000
Nickel AlloysNickel 200, 201
InconelInconel 600, 601, 625, 718, 800, 825, X-750
MonelMonel 400, k500
HastelloyHastelloy C-22, C-276, C-4, X
TitaniumGrade 1, 4, 5(Ti 6Al-4V), 6(Ti 5Al-2.5Sn), 7, 11, 6Al-2Sn-4Zr-2Mo, Grade 12, 6Al-6V-25n, Grade 23(Ti 6AL-4V ELI), 8Ai-1Mo-1V, Grade 5 ELI, Grade 9(3Al-2.5V), 6Al-7Nb.
Aluminium6063, 1100, 6082 A96082, 1050, 2017, 2024 A92024, 7050 A97050, 5083 A95083, 2014A A92014, 2011 A92011, 6061 A96061 A86061, 5754, 7085, 2050, 7071 7020, 7178, 5052 A95052, 7150, 7075 A97075 A87075, 7575, 2219, 7175
Pressure RatingClass 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
TypesThreaded, Plate, Screwed, Forged.
Supporting materialGasket, Ring Joint, Flange Bolts
Size range1/2" (15 NB) to 48" (1200NB) DN10~DN5000
High TemperatureAbove 200°C (400°F) For Class 150 Or Above 400°C (750°F)
Low TemperatureAbove -29 Degree C (−20°F)
Production techniqueForged, machined and Heat treated
Custom designAs per your drawing
OriginIndian / USA / Korean / West Europe / Japan
Pressure ClassPN 6 TO PN 100
Coating/Surface Treatment:Zinc Plated, Anti-rust Paint, Oil Black Paint, Yellow Transparent, Cold and Hot Dip Galvanized.
European/African/Russian Standard FlangesAvailable
TestDirect-reading Spectrograph, X-ray detector, UItrasonic flaw detector, Magnetic particle detector, Hydrostatic testing machine.
Marking Standard
Name of Manufacturer
Schedule
Type of Flange Facing
Pressure Class
Nominal Pipe Size, etc
Test Certificates
EN 10204/3.1B, NACE MR0103, NACE MR0175
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc

Pressure rating of Carbon Steel Ring Type Joint Flanges

Temperature (F°)150 LB300 LB400 LB600 LB900 LB1500 LB2500 LB
-20 to 1002857409851480222037056170
3002306558701310196532705450
8506532042564095515952655
4002006358451265190031705280
5001706058051205181030155025
6001405707551135170528404730
6501255507301100165027454575
2002606809051360203533955655
7001105307101060159026554425
750955056751015152025354230
10002085115170255430715
80080410550825123520553430
9005023030546069011501915
950351351852754106851145

Ring Type Joint Flanges Dimensions

Size in InchSize in MMOuter DiameterFlange ThicknessHub Outer DiameterWeld Neck Outer DiameterWelding Neck LengthRTJ RF DiameterRTJ RF HeightPCDRTJ Pitch DiameterRTJ DepthRTJ WidthBore
ABCDEFGHIJKL
1/215909.63021.346N/AN/A60.3N/AN/AN/ARefer Note
12511012.74933.45463.56.3579.447.636.358.74
1 1/43211514.35942.256736.3588.957.156.358.74
1 1/24012515.96548.36082.56.3598.465.076.358.74
25015017.57860.3621026.35120.782.556.358.74
3/42010011.23826.751N/AN/A69.9N/AN/AN/A
2 1/26518020.79073681216.35139.7101.66.358.74
820034527246219.11002736.35298.5247.656.358.74
3 1/29021522.3122101.6701546.35177.8131.786.358.74
410023022.3135114.3751716.35190.5149.236.358.74
512525522.3164141.3871946.35215.9171.456.358.74
38019022.310888.9681336.35152.4114.36.358.74
615028023.9192168.3872196.35241.3193.686.358.74
1025040528.63052731003306.35362304.86.358.74
2460081546.16636101517116.35749.3673.16.358.74
1435053533.4400355.61254256.35476.3396.886.358.74
1640059535457406.41254836.35539.8454.036.358.74
1230048530.2365323.81134066.35431.83816.358.74
1845063538.1505457.21385466.35577.9517.536.358.74
2050070041.35595081435976.35635558.86.358.74

#150 Ring Type Joint Blind Flange Dimension Chart

Size in InchSize in MMOuter DiameterFlange ThicknessHub Outer DiameterWeld Neck Outer DiameterWelding Neck LengthRTJ RF DiameterRTJ RF HeightPCDRTJ Pitch diaRTJ DepthRTJ WidthBore
ABCDEFGHIJKL
1/2159512.73821.351515.5466.734.145.547.14Refer Note
410025530.2146114.3841757.92200149.237.9211.91
12512515.95433.460706.3588.950.86.358.74
1 1/43213517.56442.26479.56.3598.460.336.358.74
3/42011514.34826.75663.56.3582.642.886.358.74
1 1/24015519.17048.36790.56.35114.368.276.358.74
2 1/26519023.910073751277.92149.2101.67.9211.91
3802102711788.9781467.92168.3123.837.9211.91
25016520.78460.3681087.9212782.557.9211.91
512528033.4178141.3972107.92235180.987.9211.91
615032035206168.3972417.92269.9211.127.9211.91
3 1/29023028.6133101.6791597.92184.2131.787.9211.91
820038039.7260219.11103027.92330.2269.887.9211.91
1230052049.3375323.81294137.92450.83817.9211.91
1435058552.4425355.61414577.92514.4419.17.9211.91
1025044546.13212731163567.92387.4323.857.9211.91
1640065055.6483406.41445087.92571.5469.97.9211.91
20500775625875081606359.53685.8584.29.5313.49
2460091568.370261016774911.13812.8692.1511.1316.66
1845071058.85334571575757.92628.6533.47.9211.91

Dimension of Class 300 SS Ring Type Joint Weld Neck Flange

Size in InchSize in MMOuter DiameterFlange ThicknessHub Outer DiameterWeld Neck Outer DiameterWelding Neck LengthRTJ RF DiameterRTJ RF HeightPCDRTJ Pitch diaRTJ DepthRTJ WidthBore
ABCDEFGHIJKL
1/2159514.33821.352515.5466.734.145.547.14Refer Note
38021031.811788.9831467.92168.3123.837.9211.9
12512517.55433.462706.3588.950.86.358.74
1 1/43213520.76442.26779.56.3598.460.336.358.74
1 1/24015522.37048.37090.56.35114.368.276.358.74
25016525.48460.3731087.9212782.557.9211.9
3/42011515.94826.75763.56.3582.642.886.358.74
2 1/26519028.610073791277.92149.2101.67.9211.9
3 1/29023035133101.6861597.92184.2131.787.9211.9
410025535146114.3891757.92200149.237.9211.91
512528038.1178141.31022107.92235180.987.9211.91
2460091576.270261017574911.13812.8692.1511.1316.66
820038047.7260219.11173027.92330269.887.9211.91
10250445543212731243567.92387.4323.857.9211.91
1230052057.2375323.81374137.92450.83817.9211.91
1435058560.4425355.61494577.92514.4419.17.9211.91
615032041.3206168.31032417.92269.9211.127.9211.91
1640065063.5483406.41525087.92571.5469.97.9211.91
1845071066.75334571655757.92628.6533.47.9211.91
2050077569.95875081686359.53685.8584.29.5313.49

SS 316 RTJ Orifice Flange Class 600 Dimension chart

Size in InchSize in MMOuter DiameterFlange ThicknessHub Outer DiameterWeld Neck Outer DiameterWelding Neck LengthRTJ RF DiameterRTJ RF HeightPCDRTJ Pitch diaRTJ DepthRTJ WidthBore
ABCDEFGHIJKL
1/2159514.33821.352515.5466.734.145.547.14Refer Note
12512517.55433.462706.3588.950.86.358.74
1 1/43213520.76442.26779.56.3598.460.336.358.74
1 1/24015522.37048.37090.56.35114.368.276.358.74
3/42011515.94826.75763.56.3582.642.886.358.74
25016525.48460.3731087.9212782.557.9211.91
2 1/26519028.610073791277.92149.2101.67.9211.91
38021031.811788.9831467.92168.3123.837.9211.91
3 1/29023035133101.6861597.92184.2131.787.9211.91
1845074582.65464571845757.92654533.47.9211.91
512533044.5189141.31142107.92266.7180.987.9211.91
615035547.7222168.31172417.92292.1211.127.9211.91
820042055.6273219.11333027.92349.2269.887.9211.91
1025051063.53432731523567.92431.8323.857.9211.91
410027538.1152114.31021757.92215.9149.237.9211.91
1230056066.7400323.81564137.924893817.9211.91
1435060569.9432355.61654577.92527419.17.9211.91
24600940101.671861020374911.13838.2692.1511.1316.66
1640068576.2495406.41785087.92603.2469.97.9211.91
2050081588.96105081906359.53723.9584.29.5313.49

Class 900 Weld Neck Ring Type Joint Flange Dimension table

Size in InchSize in MMOuter DiameterFlange ThicknessHub Outer DiameterWeld Neck Outer DiameterWelding Neck LengthRTJ RF DiameterRTJ RF HeightPCDRTJ Pitch diaRTJ DepthRTJ WidthBore
ABCDEFGHIJKL
512535050.8190141.31272167.92279.4180.987.9211.91
3/42013025.44426.77066.56.3588.944.456.358.74
12515028.65233.47371.56.35101.650.86.358.74
1 1/43216028.66442.273816.35111.160.336.358.74
1 1/24018031.87048.383926.35123.868.276.358.74
25021538.110560.31021247.92165.195.257.9211.91
2 1/26524541.3124731051377.92190.5107.957.9211.91
38024038.112788.91021567.92190.5123.837.9211.91
1/21512022.33821.36060.56.3582.639.676.358.74Refer Note
615038055.6235168.31402417.92317.5211.127.9211.91
820047063.5298219.11623087.92393.7269.887.9211.91
1025054569.93682731843627.92469.9323.857.9211.91
1230061079.4419323.82004197.92533.43817.9211.91
1435064085.8451355.621346711.13558.8419.111.1316.66
1640070588.9508406.421652411.13616469.911.1316.66
18450785101.656545722959412.7685.8533.412.719.84
2050085510862250824864812.7749.3584.212.719.84
410029044.5159114.31141817.92235149.237.9211.91
246001040139.774961029277215.88901.7692.1515.8826.97

RTJ Blind Flange #1500 Dimension Standards

Size in InchSize in MMOuter DiameterFlange ThicknessHub Outer DiameterWeld Neck Outer DiameterWelding Neck LengthRTJ RF DiameterRTJ RF HeightPCDRTJ Pitch diaRTJ DepthRTJ WidthBore
ABCDEFGHIJKL
1/21512022.33821.36060.56.3582.639.676.358.74Refer Note
12515028.65233.47371.56.35101.650.86.358.74
1 1/43216028.66442.273816.35111.160.336.358.74
1 1/24018031.87048.383926.35123.868.276.358.74
3/42013025.44426.77066.56.3588.944.456.358.74
25021538.110560.31021247.92165.195.257.9211.91
2 1/26524541.3124731051377.92190.5107.957.9211.91
38026547.713388.91171687.92203.2136.537.9211.91
512537573.1197141.31562297.92292.1193.687.9211.91
615039582.6229168.31712489.53317.5211.149.5313.49
820048592.1292219.121331811.13393.7269.8811.1316.66
1025058510836827325437111.13482.6323.8511.1316.66
410031054162114.31241947.92241.3161.937.9211.91
12300675123.9451323.828343814.27571.538114.2723.01
14350750133.4495355.629848915.88635419.115.8826.97
16400825146.1552406.431154617.48704.8469.917.4830.18
20500985177.864150835667317.48831.8584.217.4833.32
246001170203.276261040679420.62990.6692.1520.6236.53
1845091516259745732761317.48774.7533.417.4830.18

Dimension of Class 2500 Weld Neck Ring Type Joint Flange

Size in InchSize in mmOuter Dia.Flange ThicknessHub ODWeld Neck ODWelding Neck LengthRTJ RF DiaRTJ RF HeightPCDRTJ Pitch diaRTJ DepthRTJ WidthBore
ABCDEFGHIJKL
1/21513530.24321.373656.3588.942.886.358.74Refer Note
410035576.2165114.319020311.13273157.1811.1316.66
125160355733.48982.56.3510860.336.358.74
1 1/43218538.17342.2951027.92130.272.237.9211.91
1 1/24020544.57948.31111147.9214682.557.9211.91
3/42014031.85126.779736.3595.250.86.358.74
25023550.99560.31271337.92171.4101.67.9211.91
2 1/26526557.2114731431499.53196.8111.139.5213.49
38030566.713388.91681689.53228.61279.5213.49
512542092.1203141.322924112.7323.8190.512.719.84
12300760184.2441323.846449517.48619.1406.417.4833.32
6150485108235168.327327912.7368.3228.612.719.84
8200550127305219.131834014.27438.2279.414.2723.01
10250675165.137527341942517.48539.8342.917.4830.18

Ring Type Joint Flange Torque Chart

Flange
NPS
Torque N-m CopperslipTorque N-m Chesterton NickelTorque N-m Unlubricated
½405990
1405990
¾405990
405990
279116178
405690
79116178
479116178
379116178
5139203313
8139203313
6139203313
10221325502
14330485748
12221325502
16330485748
204797081098
184797081098
246689921543

Ring Type Joint Blind Flange Weight Chart

Nominal pipe diameter in InchOuter Diameter FlangeThicknessDiameter of HubDiameter of Raised FaceLengthThread LengthKGLB
125108.0014.2049.3050.8017.5017.500.81.8
1/21589.0011.2030.2035.1015.7015.700.40.9
1-1/432117.5015.7058.7063.5020.6020.601.22.6
1-1/240127.0017.5065.0073.2022.4022.401.53.3
3/42098.5012.7038.1042.9015.7015.700.71.5
6150279.5025.40192.00215.9039.6039.608.418.5
380190.5023.90108.00127.0030.2030.204.19
2-1/265178.0022.4090.40104.6028.4028.403.78.1
3-1/290216.0023.90122.20139.7031.8031.805.111.2
250152.5019.1077.7091.9025.4025.402.35.1
4100228.5023.90134.90157.2033.3033.305.913
5125254.0023.90163.60185.7036.6036.60715.4
8200343.0028.40246.10269.7044.5044.501328.6
14350533.5035.10400.10412.8057.2057.203986
10250406.5030.20304.80323.9049.3049.301839.5
20500698.5042.90558.80584.2073.2073.2076167
24600813.0047.80663.40692.2082.6082.6097214
16400597.0036.60457.20469.9063.5063.5047103
12300482.5031.80365.30381.0055.6055.602964
18450635.0039.60505.00533.4068.3068.3057126

Application

  • Food & Beverage
  • Paper Industry
  • Pharmaceutical
  • Hospital Equipment
  • Textiles
  • Dairy
  • Aircraft
  • Chemicals
  • Others Parts in Machinery
Employee

Testing

  • Hydrostatic Test
  • Macro Test
  • Ultra Sonic Test (UT)
  • Micro Test
  • Hardness Test
  • Radiography Test
  • Pitting Resistance Test
  • PMI Testing
  • Mechanical Testing
  • X-ray detector
MARKET

Packing

  • Wooden Boxes
  • Shrink-Wrappedt
  • Carton Boxes
  • Wooden Crates
  • Wooden Pallets
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