Ring Type Joint Gaskets

“RTJ” (Ring Type Joint) gaskets are manufactured in accordance with API-6A, API-17D and ASME B16.20  specifications. RTJ’s have “R, RX and BX” numbers assigned to them for pipe size and pressure class identification. Stock materials include Soft Iron, Low Carbon Steel, F5, F11, F9, 304, 304L, 316, 316L, 321, 347, DUPLEX, Monel, NICKEL, 410, Inconel and Incoloy. RING JOINT GASKETS are precision machined metallic sealing rings, suitable for high temperature and high pressure applications. By applying pressure to the seal interface through bolt force, the softer metal of the gasket flows into the micro-fine structure of the harder flange material, creating a very tight and efficient seal. They are available in several common profiles to suit a variety of industry standard flanges. Reliable rubber coated ring joint gaskets are made from precision machined carbon steel rings to API specifications and utilize a special metal-to-rubber bonding process of oil resistant nitrile rubber. Ideal for hydraulic testing of BOP’s (Blowout Preventers), Christmas Trees, Chokes & Kill Manifolds and available in most of the commonly utilize sizes of R and BX series rings. Rubber Coated Ring Gaskets are used to minimize the risk of fl ange damage during testing and should be removed and replaced with specified gasket for actual application. Ring type joints are primarily used by the oil, gas and petrochemical and offshore industries. They are also commonly used on valve/pipework assemblies and high integrity vessel joints.

APPLICATION:-

Ring Type Joints are used to seal flanged connections subject to high pressures and temperatures. These precision made solid metal gaskets form a metal-to-metal seal with the flanges. Precision Machine Tools manufactures large range ring gaskets in accordance with API-6A/ASME 16.20. We manufacture four basic types of ring gaskets; octagonal shape, oval shape, type RX and type BX. These basic shapes are used in pressures up to 20,000 psi. The dimensions are standardized and require specially grooved flanges. The octagonal cross section has a higher sealing efficiency than the oval and would be the preferred gasket. Stock materials include soft iron, low carbon steel, 4-6 chrome (F5), 304, 316,   Inconel and Incoloy. 

These basic shapes are used in a variety of applications with pressures up to 20,000 PSI. The dimensions are standardized and require specially grooved flanges by where a corresponding “R” or “BX” number is assigned for pipe size and pressure class for gasket identification.They are widely used in the Oil/Gas and Petrochemical industry, in valves and pipe-work. Choice of material may be determined to suit higher temperatures and aggressive media. They comply with ASME B16.20 standards and API spec 6A (where applicable).

The gasket hardness is carefully controlled and shall always be softer than the mating flanges to ensure a good seal and no damage to the flange surface (note: RTJ gaskets should not be re-used). All SMITH RTJ gaskets are manufactured from fully traceable materials and are stamped to the requirements of API 6A and ASME B16.20. DIN 50049 3.1 certification is supplied with all orders. The gaskets are machined to the required tolerances and surface finish using high quality CNC lathes. All soft iron and carbon steel RTJ gaskets are electroplated with zinc 0.0005″ thick in accordance with API specifications. Other non-standard styles of metal rings are also available like combination, IX, Delta and Lens to customer specifications.

METALLIC GASKETS FOR PIPE FLANGES

The Ring Type Joint gasket, or RTJ gasket, was originally developed for the petroleum refining industry. The refining processes produced extremely high pressures with flammable and explosive medias. The oil fields, rigs, and down hole equipment continue to utilize the RTJ gasket due to their high pressure service capability. Being a metal to metal type solid seal, the RTJ is capable of withstanding extremely high pressures in very hot applications.

Ring Joint Gaskets are either octagonal or oval made to ASME B 16.20 in various sizes. API Ring Joint Gaskets come in two basic types, an oval cross section and an octagonal cross section. These basic shapes are used in pressures up to 10,000 psi. The dimensions are standardized and require specially grooved flanges. These are identified by numbers R, RX or BX that relate toFlange size, pressure, class, and appropriate standards ASME B 16.20 or API 6A. Ring Joint Gaskets are manufactured in various types. These Ring Joint Gaskets are developed in accordance toAPI6A & ASME B 16.20 specifications. Materials for these gaskets are selected based on suitability for service conditions. It is essential that Ring Joint Gaskets be of a hardness lower than the Flanges.

APPLICATION:-

  • Ring type joints excel in high-pressure applications such as oil and gas exploration and production.
  • RTJs are also used on valves and pipework assemblies in refineries and other process industries.
  • Sub-Sea wellhead & Christmas tree systems
  • Ring joint gaskets are metallic sealing rings suitable for high pressure and high temperature applications and are fitted in ring groove type flanges.
  • Refining
  • Down Hole
  • Christmas Tree Processes
  • Subsea
  • Super-Heated Steam
  • API 6A
  • ASME B16.20
  • ASME B16.5
  • ANSI, DIN & JIS Flanges

Available in both oval and octagonal profiles, standard style R ring type joints are manufactured to meet both API 6A and ASME B16.20 sizes and ratings.

Also available are Style RX ring type joints which energizes on assembly. This type is designed to fit the same groove as a style R therefore making them interchangeable. For very high pressures, often found in sub-sea wellhead and Christmas tree systems, the style BX is used. Subsea versions of all styles are available with pressure balance holes.

We also design and manufacture special RTJ and bespoke solid metal gaskets for topside and subsea blow-out preventers.

Features:
• High durability and reliability
• Available in various specifications
• Made up of best grades of materials
• Highly qualitative in nature
• Corrosion resistant
• For high pressure and high temperature sealing up to 15000 psi
• High seating stress contact provides a tight seal
• Metal core construction prevents blow-outs
• For 1.6 Ra and smoother flange finishes
• Available in several configuration

Benefits:
• Low cost, high pressure sealing solution for refining and drilling processes.
• Meets all the requirements for API-6A, API-6B, API-17D, and ASME B16.20.
• Fire tested designs
• Easy Installation

Materials:
• Soft iron and low carbon steels
• Stainless steel 316, 321, 304, 309, 316L, 347.
• Monel®400, Alloy 600, Alloy 625, Incoloy®825, Incoloy®800 for corrosive services.
• Titanium, Hastelloy®C276, Alloy 20
• Coated RTJ gaskets are available for pressure testing systems with PTFE or buna.

Configuration:
• R, RX, BX type gaskets
• SRX and SBX RTJ gaskets, rubber coated and PTFE coated for pressure testing.
• Transition RTJ, blind Ring RTJ, lens rings, weld ring gaskets.
• Flange guards are also available as per API, ASME, MSS SP44 flanges from neoprene closed cell foam.

FLANGE STANDARDS
Ring joint gasket can be manufactured in accordance with all relevant gasket standards and specifications to suit the following flange designations

API605 (ASME B16.47 SERIES B)
ASME/ANSIB16.5
BS1560
BS4504
BS10
DINDIN FLANGES
FRENCHNF STANDARD
JISFLANGES
MSS SP44 (ASME B16.47 SERIES A)

API ring Joint gaskets come in two basic types, an oval cross section (Style 377) and an octagonal cross section (Style 388). These basic shapes are used in pressures up to 10,000 psi. The dimensions are standardized and require specially grooved flanges.

  • The octagonal cross section has a higher sealing efficiency than the oval and would be the preferred gasket.
  • The oval cross section can be used in the old type round bottom groove. The newer flat bottom groove design will accept either the oval or the octagonal cross section. The sealing surfaces on the ring joint grooves must be smoothly finished to 63 micro inches and to be free of objectionable ridges, tool or chatter marks. They seal by an initial line contact or a edging action as the compressive forces are applied.

The hardness of the ring should always be less than the hardness of the flanges to prevent flange deformation. Dimensions for API ring joint gaskets and grooves are covered in ASME B16.20 and API6A.

Reliable Pipes & Tubes Ltd are Manufacturers of Following types of Gaskets :

flange gasketbx ring gasketsinconel gasketsring gasket bxss gaskets
ring joint typering type gasketring gasket typesring joint gasketslens ring gasket
rx gasketring gasket rxrtj flange gasketincoloy gasketssrx gasket
monel gasketsr gasketring joint gasket materialduplex gasketsoval ring gasket
rtj gasketmetallic gaskets304 gasketsoctagonal ring gasketring joint gasket manufacturer
ring type joint gasketring gasket materialhastelloy gaskets800ht gasketsring gaskets
ring gasket supplierrtj ring gasketsring type joint gasketsring type jointsbx gasket
bx gasketseal ring gasket ring jointflat ring gasketstainless gaskets
gasket ring joint600 gaskets ring gasket800 gasketsapi ring gasket
api ring gasketsbx ring gasketoval gasketoctagonal ring joint gasket316 gaskets
800h gasketsnickel gasketsring joint gasket316l gasketsb16.20 gaskets
ring gaskettitanium gasketsrtj gasketsoval ring joint gasketss316 ring gasket
ring gaskets for flanges304l gasketsring joint flange gasket  

Types of Gaskets

  • Ring Joint Gasket
    • R Series
    • Rx Series
    • Bx Series
    • Srx Sbx Series
  • Bonnet Gasket
  • Customized Gaskets
  • Ax Gaskets
  • Cx Gaskets
  • Dx Gaskets
  • Vx Gaskets
  • IS Gaskets
  • Api Ring Joint Gaskets
  • Style Ix Norsok Gaskets
  • Style Ax Gaskets
  • Bridgeman Gasket
  • Delta Gasket
  • Rubber Coated Oval Ring Gasket
  • Transition Rings Gasket
  • Lens Type Gasket
  • R-Oval – Ring Gasket
  • R-Octagonal – Ring Gasket
  • Split Ring Gasket
  • Combination Gasket
  • FRJ-RJ Gasket
  • RTJ-KAMM Gasket
  • Special Ring Joint Gaskets

 

Gaskets Material

Material Trade Name
Ring identi-fication
DIN Specifi-cation
DIN Material nr.
AISI
ASTM UNS
B.S.
Hardness
Temp (°C)
Density
Brinell HB
Rock-well B
min
max
(gr/cm3)
soft iron
D
 
 
 
 
90
56
-60
500
7.85
Steel (LCS)
S
 
 
 
 
120
68
-40
500
7.85
ASTM A 182-F5
F5
12CrMo 195
1.7362
A182-F5
 
130
72
-40
650
7.9
SS 304
S 304
X5CrNi 189
1.4301
304
304S15/16/31
160
83
-250
550
7.9
SS 309
S 309
X15CrNiSi 2012
1.4828
309
309S24
160
83
-100
1000
7.9
SS 316
S 316
X5CrNiMo 1810
1.4401
316
316S31/33
160
83
-100
550
7.9
SS 316L
S 316L
X2CrNiMo 1810
1.4404
316L
316S11/13
160
83
-100
550
7.9
SS 321
S 321
X10CrNiTi 189
1.4541
321
321S12/49/87
160
83
-250
550
7.9
SS 347
S 347
X10CrNiNb 189
1.4550
347
347S31
160
83
-250
550
7.9
Monel 400*
M400
NiCu30Fe
2.4360
N04400
3072-76NA13
130
72
-125
600
8.8
Inconel 600*
INC-600
NiCr 15Fe
2.4816
N06600
3072-76NA14
200
94
-100
950
8.4
Inconel 625
INC-625
 
 
N06625
 
200
94
 
 
 
Incoloy 800*
INC-800
x10NiCrAITi 3220
1.4876
N08800
3072-76NA15
200
94
-100
850
8
Incoloy 825*
INC-825
NiCr 21Mo
2.4858
N08825
3072-76NA16
160
83
-100
450
8.14
Titanium
Ti
Ti 99.8
3.7025
 
 
160
83
-100
350
4.5
Carbon Steel, Soft Iron
Monel® 400
Hastelloy B2 & C276
304316TiNickel 200Copper
304L310Inconel® 600, 625 X-750Zirconium
316321Incoloy ® 800 & 825Duplex
316L3CR12TitaniumPTFE (Inner Rings Only)

Material Cross Reference Chart

Trade NameRing IDASTMDINWerkst-off NoAISI/SAEUKOther
Soft IronD  1.1003/
1.0335
  Aramco/ StW24
LCSS  1.1003/
1.0335
  Aramco/ StW24
CS360 LTCS360LTA516 Gr70     
41404140UNS G4140042CrMo41.72254141  
F5F5UNS K4254412CrMo1951.7362  5Cr1/2Mo
SS304S304S30400X5CrNi18 91.4301304304SS15 
SS304LS304LS30403X2CrNi18 91.4306304L304SS12 
SS309S309S30900X15CrNisI20121.4828309309S24 
SS310S310S31008XX15CeNiSi25201.4841310310S24 
SS316S316S31600x5CrNiMo18 101.4401316316S16 
SS316LS316LS31603X2CrNiMo18 101.4404316L316S11/316S12 
SS316L
UREA
S316UGS31603X2CrNiMo 18 14 31.4435   
SS316TiS316TiS31635X10CrNiMoTi18101.4571316Ti320S31/320S17 
SS321S321S32100X10CrNiTi18 91.4541321321S12 
SS347S347S34700X10CrNiNb 18 91.455347347S51 
SS410S410S41000X10Cr131.4006410410S21 
Monel 400Monel 400N04400NiCu30Fe2.436   
Inconel 600INC600N06600NiCr15Fe2.4816   
Inconel 625INC625N06625NiCr22Mo9Nb2.4856   
Inconel 718INC718N07718     
Incoloy 800INC800N08800X5NiCrAlTi31-201.4958   
Incoloy 800HINC800HN08810 1.4958   
Incoloy 825INC825N08825NiCr21Mo2.4858   
904L904LN08904X1NiCrMoCu25-20-51.4539   
F51F51S31803X2CrNiMoN22-5-31.4462  2205 /Duplex
F53F53S32750X2CrNiMoN25-7-41.441   
F55F55S32760X2CrNiMoCuWN 25 71.4501  Zeron 100
F60F60S32205    Duplex
TitaniumTiR50400 3.7035   
17-4PH17-4PHS17400 1.4542  630
S254S254S31254X1CrNiMoCuN20-18-71.4547  F44 / 6Mo
C276C276N10276NiMo16Cr15W2.4819  Hastelloy
Alloy 28Alloy28N08028X1 NiCrMoCuN 31 27 41.4563  SANICRO 28
Ring Gasket Material
Maximum Hardness
Identification
 
Brinell
Rockwell ‘B’ Scale
ASME B16.20
API – 6A
Soft Iron
90
56
D
D-4
Low Carbon Steel
120
68
S
S-4
4-6 Chrome 1/2 Moly
130
72
F5
 
Type 410
170
86
S 410
 
Type 304
160
83
S 304
S304-4
Type 316
160
83
S 316
S316-4
Type 347
160
83
S 347
 
Material (Trade Mark)Ring
Identi-fication
DIN
Speci-fication
DIN Material No.AISI ASTM UNSB.S.Hardness (max)*Temperature (0 C)*Specify Density (gr/cm3)
      Brinell HBRockwell BMinMax 
Soft IronD9056-605007.85
Steel (LCS)S12068-405007.85
ASTM A 182-F5F512CrMo 1951.7362A 182-F513072-406507.9
Stainless Steel 304S 304X5CrNi 18101.4301304304S15/16/3116083-2505507.9
Stainless Steel 304LS 304LX2CrNi 19111.4306304 L304S1116083-2505507.9
Stainless Steel 309S 309X15CrNiSi 20121.4828309309S2416083-2505507.9
Stainless Steel 316S 316X5CrNiMo 17121.4401316316S31/3316083-10010007.9
Stainless Steel 316LS 316LX2CrNiMo 17131.4404316 L316S11/1316083-1005507.9
Stainless Steel 316TiS 316 TiX10CrNiMoTi 17121.4571316 Ti320S3116083-1005507.8
Stainless Steel 321S 321X6CrNiTi 18101.4541321321S12/49/8716083-2505507.9
Stainless Steel 347X347X6CrNiNb 18101.4550347347S3116083-2505507.9
Material
Identification
Hardness (Brinell HB)
Hardness (Rockwell B)
Density
Inconel
625
180
90
8.0
Inconel
85
180
90
8.0
Monel
400,000
180
90
8.0

Technical Data for Gaskets

Dimensions

HELPFUL LINKS

error: Content is protected !!