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The importance of backup rings to O rings

Backup rings are ultimately used to help stop o ring migration, and they achieve this in both static and dynamic fluid power applications as the pressure cycles occur, preventing the extrusion of an o ring in the gap.  Ultimately a backup ring is a rigid ring that...

Gasket manufacturing process explained

Specialist Sealing Products have been providing high-quality gaskets to customers throughout the UK for many years. We pride ourselves in the range of gaskets we have available, suitable for a variety of applications across a range of industries.  Rubber gaskets are...

Designing seals for the food industry

There’s a number of factors to take into consideration when designing seals for the food industry. That’s because seals used within this sector need to work exceptionally hard in all food processing environments where hygiene and health and safety are of the utmost...

Storing your gaskets!

A strange headline for a gasket article, we know.  However, it’s an important area and one, which in this sector is often overlooked.  When we think about most products or items in and around our homes and business, we will recognise that most come with manufacturing...

Flange Gasket materials – What you need to know

Getting the most out of flange gasket materials and ensuring the performance of the gasket is not affected when you come to use it, means several things must be taken into consideration.  For example, factors such as their design, how they’re manufactured, installed,...

Spiral Wound Gaskets and Sheet Gaskets

Gaskets come in a range of different shapes and sizes.  All are offering similar functionality; gaskets are produced using a range of different materials to suit a range and a variety of environmental factors, industrial uses, and product requirements.  When it comes...

Benefits of Kammprofile Gaskets

Used to prevent leakage, gaskets are constructed to fit between a range of different sizes and types of surfaces in order to provide the perfect seal.  Typically used in pipes and heat exchangers, gaskets are widely used as industrial sealants.  Kammprofile gaskets,...

Purpose of a Kammprofile Gasket

The ultimate purpose of a gasket is to stop leaks while being able to deal with varying levels of compression.  When it comes to Kammprofile gaskets, these are ideal for standard pipeline and heat exchanger applications.  As due to their grooved metalcore, with a...

Are your gaskets completely compliant?

In industries where gaskets are not just important but essential, there are numerous challenges to be faced and considerations to take on board.  This is especially true when it comes to making sure this “essential” element is also compliant.  With the implementation...

Everything you need to know about Manway Gaskets

When it comes to manway gaskets, we want to keep things simple, introducing them as the small sealing ring found in hatches/openings that are constructed for large tanks. Openings which give people access to the inside of the aforementioned tanks and vessels. The...

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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