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Different elastomers for o rings and various applications

An elastomer is a primary raw material used for most o rings. They are typically manufactured as gum rubber or manufactured synthetically, and surprisingly today, there are approximately over 32 different synthetic rubbers now available.  Elastomer compounds will...

Spiral wound gasket thickness – what’s best?

It is often recommended that using a thinner gasket type/material will result in better sealing performance.  Why?  Because thinner gaskets tend to require much less gasket stress to provide applications with the perfect seal, they also have an excellent response to...

Choosing the correct oil seal application

Choosing and using the proper sealing devices within oil and gas applications can be vital when preventing dirt, dust, water, and other debris from potentially getting inside and contaminating products.  Of course, all rubber materials and seals will provide a range...

Nitrile rubber, NBR, and Buna-N – how well do you know your o ring materials?

A widely used elastomer, Nitrile, Buna-N, or NBR rubber, are all oil and fuel resistant and provide a great level of strength, making them a popular material for seals across various industries.  Suitable for a range of applications, this versatile rubber material,...

Optimum squeezing force for an o ring

It is true that the more squeeze you place on an o ring, the tighter the seal it will provide. In essence, the more squeeze (compression) you apply, the greater the force between the o ring and its mating hardware.  And ensuring you have the perfect seal is all...

O Ring Squeeze

The squeeze and shrinkage on an o ring are vital to understanding as these factors stand in the way of your application either experiencing a perfect seal or your application suffering from leaks.  You can measure the shrinkage of an o ring during...

Keeping your o rings bonded

EMI o rings. Those seal ring gaskets are made of silicone compounds, combining environmental sealing with electromagnetic interference protection.  Consisting of metal or metal-coated particles, silicone o rings are filled with silver, silver aluminium, or nickel...

The importance of mechanical seals when reducing water consumption in mining

Environmental considerations are at the top of most industry's agendas in the 21st century as companies evaluate and improve operations, processes, and systems.  Conserving water in mining is one such area that is now being investigated further with the rotation of...

How choosing the correct gasket reduces risks

Health and Safety across any industry are vital, especially so in industrial facilities and settings.  Why?  Because harmful leaks and emissions must be avoided at all costs to avoid serious accidents or injury to your teams and property.  That’s why having the right...

How to tighten your bolts perfectly

How to tighten your bolts and which tools you should use to achieve the perfect seal is not as seamless and straightforward as we would like. Various factors come into play in these situations, such as bolt grade, size, and even application type.  Tightening torques...

Quality Ring Type Joints (RTJs)

Ring Type Joint (RTJ) Gaskets are precision machined, from a wide range of materials, determined by service conditions, and are suitable for high temperature and high pressure applications. 

General Market Sector Industry’s  include; 

Oil and Gas, Petrochemical, Petroleum Oil Field Drilling Equipment and Offshore Sub-Sea applications 

They come in a variety of shapes and sizes and are labelled as ‘Styles’.  Type R  – Oval, Type R – Octagonal, Type RX and Type BX complete the standard range of ‘Styles’ and are manufactured in accordance to API 6A, API 17D, ASME B16.20 or to customer specific requirements 

Quality Ring Type Joints (RTJs)

STYLE R

These are manufactured in accordance with API  6A for heavy duty use in the Petroleum industry  particularly in oil field drilling equipment. Both types are interchangeable on octagonal type grooved flanges 

Ring Type Joints Style R Oval
Ring Type Joints Style R Octagonal
RX Ring Type Joint Drawing

STYLE RX

Suitable for ASME B16.5 Flanges up to 2500 LBS and API 6A type 6B Flanges can withstand pressures up to 5,000 psi. The RX Style is based upon the standard Style R, and will fit the same groove, but becomes energised when the assembly is pressurised thus improving the efficiency of the seal. 

STYLE BX 

BX Gaskets are manufactured in accordance with ASME B16.20, API 6A and API  17D, a variant specifically for subsea applications. They are machined in a symmetrical shape ensuring flange face to face contact on both the inner and outer diameters and incorporate a pressure hole to give energized sealing up to 20,000 psi.

BX Ring Type Joint Drawing
Ring Type Joint

The gasket material should be selected and determined to suit the service conditions. It is always recommended that the gasket material should be approximately 30 Brinell softer than the mating flange material to ensure sufficient deformation of the gasket, thus providing subsequent sealing force. 

The more common materials used are as stated in the table below  

Material Reference Table
MATERIALIDENTIFICATIONMAXIMUM HARDNESS (BHN)
Soft IronD90
Low Carbon SteelS120
F5 (4-6% Chrome – 1/2% Moly)F5130
SS 304S304160
SS 316S316160
SS 321S321160
SS 347S347160
SS 410S410170
Alloy 600N06600200
Alloy 625N06625200
Alloy 800N08800200
Alloy 825N08825200
Hastelloy C-276N10276200
Duplex 31254S31254180
Duplex 31803S31803250
Monel 400N04400200
TitaniumR50400215
Type R Oval and Octagonal Ring Type Joint Gasket Dimensions In Accordance to ASME B16.20 / API 6A
ASME B16.5 FLANGES / ASME B16.20API 6B FLANGES / API 6A (psi)PCDWIDTHRING HEIGHT
Ring No.1503/60090015002500200030005000(mm)(mm)OVAL (mm)OCT (mm)
R11½”34.146.3511.29.7
R12½”½”39.77.9514.212.7
R13¾”½”42.887.9514.212.7
R14¾”¾”44.457.9514.212.7
R151”47.637.9514.212.7
R161”1”1”34”1”1”1”50.87.9514.212.7
R171.1/4”57.157.9514.212.7
R181.1/4”1.1/4”1.1/4”1”1.1/4”1.1/4”1.1/4”60.337.9514.212.7
R191.1/2”65.17.9514.212.7
R201.1/2”1.1/2”1.1/2”1.1/2”1.1/2”68.287.9514.212.7
R211.1/4”72.2411.1317.516
R222”82.557.9514.212.7
R232”1.1/2”2.1/16”82.5511.1317.516
R242”2”2.1/16”2.1/16”95.2511.1317.516
R252.1/2”101.67.9514.212.7
R262.1/2”2”2.9/16”101.611.1317.516
R272.1/2”2.1/2”2.9/16”2.9/16”107.9511.1317.516
R282.1//2”111.1312.719.117.5
R293”114.37.9514.212.7
R303”117.4811.1317.516
R313”3”3.1/8”3.1/8”123.8311.1317.516
R323”12712.719.117.5
R333.1/2”131.787.9514.212.7
R343.1/2”131.7811.1317.516
R353”3.1/8”136.5311.1317.516
R364”149.237.9514.212.7
R374”4”4.1/16”4.1/16”3.1/2”149.2311.1317.516
R384”157.1815.8822.420.6
R394”4.1/16”161.9311.1317.516
R405”171.457.9514.212.7
R415”5”5.1/8”5.1/8”180.9811.1317.516
R425”190.519.0525.423.9
R436”193.687.9514.312.7
R445”5.1/8”193.6811.1317.516
R456”6”7.1/16”7.1/16”211.1511.1317.516
R466”7.1/16”211.1512.719.0517.5
R476”228.619.0525.423.9
R488”247.657.9514.312.7
R498”8”9”9”269.8811.1317.516
R508”9”269.8815.8822.2220.6
R518”279.422.2328.626.9
R5210”304.87.9514.312.7
R5310”10”11”11”323.8511.1317.516
R5410”11”323.8515.8822.2220.6
R5510”342.928.5836.5135.1
R5612”3817.9514.312.7
R5712”12”13.5/8”13.5/8”38111.1317.516
R5812”38122.2328.626.9
R5914”396.887.9514.512.7
R6012”406.431.7539.738.1
R6114”14”14”419.111.1317.516
R6214”419.115.8822.2220.6
R6314”419.125.433.3331.8
R6416”454.037.9514.212.7
R6516”16.3/4”16.3/4”469.911.1317.516
R6616”469.915.8822.420.6
R6716”469.9028.5836.6035.10
R6818”517.537.9514.2012.70
R6918”18”533.4011.13.17.5016.00
R7018”18”533.4019.0525.4023.90
R7118”533.4028.5836.6035.10
R7220”558.807.9514.2012.70
R7320”20.3/4”584.2012.7019.1017.50
R7420”20.3/4”584.2019.0525.4023.90
R7520”584.2031.7539.6038.10
R7624”673.107.9514.212.7
R7724”692.1515.8822.420.6
R7824”692.1525.4033.3031.80
R7924”692.1534.9344.5041.40
R8022”615.957.9514.2912.70
R8122”635.0014.3020.6419.10
R9326”749.3019.0525.4023.90
R9428”800.1019.0525.4023.90
R9530”857.2519.0525.4023.90
R9632”914.4022.2328.5826.90
R9734”965.2022.2328.5826.90
R9836”1022.3522.2328.5826.90
R998”8”234.9511.1317.4616.00
R10026”749.3028.5836.5135.10
R10128”800.1031.7539.6838.10
R10230”857.2531.7539.6838.10
R10332”914.4031.7539.6838.10
R10434”965.2034.9344.4541.40
R10536”1022.3534.9344.4541.40
RX Ring Type Joint Gasket Dimensions In accordance to ASME B16.20 / API 6A
API 6B FLANGES / API 6A (psi)ODHEIGHTWIDTH
RING NO200030005000(mm)(mm)(mm)
RX201.1/2”1.1/2”1.1/2”76.2019.058.40
RX232”93.2725.4011.91
RX242”2”105.9725.4011.91
RX253.1/8”109.5519.058.74
RX262.1/2”111.9125.4011.91
RX272.1/2”2.1/2”118.2625.4011.91
RX313”3”134.5425.4011.91
RX353”147.2425.4011.91
RX374”4”159.9425.4011.91
RX394”172.6425.4011.91
RX415”5”191.6925.4011.91
RX445”204.3925.4011.91
RX456”6”221.8425.4011.91
RX466”222.2528.5813.49
RX478”246.2641.2819.84
RX498”8”280.5925.4011.91
RX508”293.3631.7516.66
RX5310”10”334.5725.4011.91
RX5410”337.3431.7516.66
RX5712”12”391.7225.4011.91
RX6314”441.7350.8027.00
RX6516”480.6225.4011.91
RX6616”457.9931.7516.66
RX6918”544.1225.4011.91
RX7018”550.0641.2819.84
RX7320”596.1131.7513.49
RX7420”600.8641.2819.84
RX998”8”245.6725.4011.91
RX2011.3/8”51.4611.305.74
RX2051.13/16”62.3111.105.56
RX2102.9/16”97.6419.059.53
RX2154.1/16”140.8925.4011.91
BX Ring Type Joint Gasket Dimensions In accordance to ASME B16.20 / API 6A
API 6B FLANGES / API 6A (psi)ODHEIGHTWIDTHHOLE SIZE
RING NO200030005000100001500020000(mm)(mm)(mm)(mm)
BX1501.11/16”1.11/16”72.199.309.301.5
BX1511.13/16”1.13/16”1.13/16”76.409.639.631.5
BX1522.1/16”2.1/16”2.1/16”84.6810.2410.241.5
BX1532.9/16”2.9/16”2.9/16”100.9411.3811.381.5
BX1543.1/16”3.1/16”3.1/16”116.8412.4012.401.5
BX1554.1/16”4.1/16”4.1/16”147.9614.2214.221.5
BX1567.1/16”7.1/16”7.1/16”237.9218.6218.623.0
BX1579”9”9”294.4620.9820.983.0
BX15811”11”11”352.0423.1423.143.0
BX15913.5/8”13.5/8”13.5/8”426.7225.7025.703.0
BX16013.5/8”402.5923.8313.743.0
BX16116.3/4”491.4128.0716.213.0
BX16216.3/4”16.3/4”475.4914.2214.221.5
BX16318.3/4”556.1630.1017.373.0
BX16418.3/4”18.3/4”570.5630.1024.593.0
BX16521.1/4”624.7132.0318.493.0
BX16621.1/4”640.0332.0326.143.0
BX16726.3/4”759.3635.8613.111.5
BX16826.3/4”765.2535.8616.051.5
BX1695.1/8”173.5115.8512.931.5
BX1706.5/8”6.5/8”218.0314.2214.221.5
BX1718.9/16”8.9/16”267.4414.2214.221.5
BX17211.5/32”11.5/32”333.0714.2214.221.5
BX30330”30”852.7537.9516.971.5
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