The ring type joint rtj gasket is a forged ring that fits into the machined groove of an rtj flange. Ring type joint gaskets a quality product of tat lee engineering ipr seel crosssection ring type standard r oval. A number of ring joint styles are available designed for specific flange types, these are. Flanges used in piping orifice, threaded, slipon, blind, weld neck, socket, lap joint, and reducing are available with a variety of facings, such as raised, flat, and ring joint. The high seating stress causes plastic flow of the gasket into the flange faces to create the seal the rx and bx gaskets are designed to be pressure activated by the sealed media which improves the efficiency of the seal as the internal pressure of the system increases. Available in both oval and octagonal configurations, both types are interchangeable on the modern octagonal type grooved flanges. Joint sealant is composed of 100% virgin expanded ptfe. Following the acceptance of ring joints for flanges and valves by api and the issuance of their standard, asa b16e on steel pipe flanges and flanged fittings was revised to include them, and the 1939 edition included standard dimensions for a full line of ring joint flanges.
Flanges are used, alternatively to welded connections, to facilitate maintenance operations a flanged joint. Further to this, when the flanges were disassembled, damage was found on the rtj groove in which the ring type gasket seats. Ring joint rtj tongue and groove male and female spigot and recess o ring groove o ring spigot and o ring. Check the flange size, rating, type and material of the flanges. This type of flange is used in high pressure and temperature services. Ring joint type face flange has a specially designed grove in which metal gasket seat. This face type allows the use of a wide combination of gasket designs, including flat ring sheet types and metallic composites such as spiral wound and double jacketed types. Learn different types of pipe flanges used in piping. Characteristics gasket profiles and limiting values. Class 1503006001500 2500 din pn 6 welding necksliponblind flanges. May 12, 2016 a ring type joint flange, abbreviated as rtjf, is a type of flange that uses a metal ring that sits in a hexagonal groove as a gasket to seal the flange pair. Ring type joint profiles type r ring type joints square cross section with noble models m8 and m9 m8 model r oval section and m9 model r octagonal section ring type joints are designed for flanges with standard ring type grooves. Flat face commonly used on as 2129 flanges and raised face commonly used on asme flanges other facings include.
It is based on proven technology, has no moving parts and is suitable for hightemperature and highpressure applications. The standard response to such flange leakages had been to reweld and remachine the rtj groove of the flange faces and fit a new ring joint. These flanges incorporate special metallic ring joint gaskets. The inside bore circle type of gasket is used with a raised face flange. These standard shapes are used to seal pressures up to 5,000 psi in accordance with api 6a. The flexitallic group is the international market leader. Following the acceptance of ringjoints for flanges and valves by api and the issuance of their standard, asa b16e on steel pipe flanges and flanged fittings was revised to include them, and the 1939 edition included standard dimensions for a full line of ringjoint flanges based on the api standard. Precision engineered flanges ring joint flanges class 150 facing dimensions. Type d gaskets are specifically designed to fit into the ring groove of ring type joint flanges. This datasheet is for flanges that have a ring type joint rtj end connection. Additional in depth information about these kinds of flanges can be found on the ring type joint page. The flanges seal when the bolts are tightened and the gasket is compressed into the groove. A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together. The ring type joint gaskets are either octagonal or oval in crosssection.
Rtj flanges have grooves cut into their faces which accept steel ring gaskets. Dims bw elbows 4590 lr valves general pressure classes of flanges flange types. Ringjoint, spiralwound, and jacketed ring type joint. They are manufactured of medium weave, fabricreinforced phenolic material and are sized to ansi and api specifications.
The information in these pages was compiled from industry sources which texas flange and fitting supply believes to be reliable. The type of flange to be used for a piping application depends, mainly, on the required strength for the flanged joint. The joint sealant rope has a peelable tape on one side, allowing for easy installation. Ring joint flanges catalogue hydraulic and offshore supplies. All leader ring type joint gaskets are manufactured in compliance with api6a and ansi b16. Whether you are looking for a standard ring type joint gasket or custom. Groove depth e is not included in flange thickness t but is included in the connection overall length l.
Weldbend is the only domestic manufacturer of both carbon steel fittings and flanges. A flange can also be a plate or ring to form a rim at the end of a pipe when fastened to the pipe for example, a closet flange. B d mm size inch code weight lb d1 mm d2 mm h mm b. Bsm rjt fittings ring joint type bsm male rjt stainless steel 316 to identify the size of fitting measure o. Suppliers of flanges to the oil, gas, filtration, refining, petrochemical, desalination and offshore industries. Rtj flanges seal when tightened bolts compress the gasket between the flanges into the grooves, deforming or coining the gasket to make intimate contact inside the grooves, creating a metal to metal seal. The ring type joint material is selected in order to suit the application conditions. Api ring joint gaskets come in two basic types, an oval cross section style 377 and an octagonal cross section style 388. Oct 24, 2017 like the ring type gasket, this can also seal raised flange faces, but will have an od the same as the flange. That means it needs holes for the securing bolts to pass through, and these help locate the gasket on the flange, making alignment easier.
The flange face is the surface area that hosts the gasket. There are five different types of asme flanges that are readily available and used throughout industry. Cutaway view of bx steel ring and flange as follows one pressure passage hole required per ring on center line a plus tolerance of 0. The rtj type orifice plate incorporates an integral gasket, either oval or octagonal ring, for mounting between ring type joint flanges. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. Type r oval and octagonal rtj dimensions to asme b16. It is always recommended that the gasket material be softer than the mating flanges. Hitech seals gasket division distributes joint sealant by the spool. Rf, ff, rtj flange face and finish projectmaterials. Leader ring type joint rx ring type joint gaskets description leader ring type joint flange gaskets rtj gaskets are used in applications that involve extreme pressures and high temperatures. The rtj type orifice plate incorporates an integralgasket,eitherovaloroctagonalring,for mounting between ring type joint flanges. A lengthy and costly exercise, both in terms of man hours and lost production, but in many cases this did not solve the issue and a repeat failure occurred with. A blind flange is a plate for covering or closing the end of a pipe. The flanges seal when the bolts are tightened and the gasket is compressed into the groove making a metal to metal seal.
Texas flange provides the following series of individual pages in html and pdf format that contain flange dimensions of the standard flanges we provide. As with all solid metal ring type joints including style r, it is. Ring joints class 1502500 ring joint dimensions ansi b16. Bx ring type joint gaskets,china bx ring type joint gaskets. The pitch diameter of the ring is slightly greater than the pitch diameter of the flange groove. Whether you are looking for a standard ring type joint. Valve bonnet seal ring ring type joint,ring gasket,ring. Dimensions and tolerances are in accordance with asme b16. Expanded ptfe provides near universal resistance and good compressibility.
Marcel piping is renowed ring type joint flange manufacturers in india, a asme b16. Orifice flanges are one of the most economical means of measuring flow, and daniel orifice flanges are manufactured to be the most accurate. Bx style are available in sizes reaching 20,000 psi. Watch the video showing set up process of the mm600e flange facing machine ring type joint flanges are typically used in high pressure andor high temperature applications and differ from other flanges as angled faces are cut into the flange faces to accept steel ring gaskets, to create a metal to metal. Ansi rtj flanges cl150cl2500 ansi ring type joint flanges. Roctagonaal solid metal gasket for api or asme ring type joint flanges. Bolt circle diameters are 18 inch larger than bolt. These basic shapes are used in pressures up to 10,000 psi. Available in low carbon steel, stainless steel 304 and stainless steel 316. The ring type joint was initially developed for high pressure up to 1500 bars and temperatures up to. Rtj flanges have grooves cut into their faces which accept steel ring. Stud bolts dimensions for raised face and ring type joint. Drawing of facing dimensions for ring joint flanges high.
Based on flange facing types, it can be further classified as. The more commonly used ring type joint materials are soft iron, low carbon steel and different types. The hardness of valve bonnet seal ring must be1520hb lower than the mating flange face. The purpose of a rf flange is to concentrate more pressure on a smaller gasket area and thereby increase the pressure containment capability of the joint. Texas flange provides the following series of individual pages in html and pdf format that contain flange dimensions of the standard flanges. It is based on proven technology, has no moving parts and is suitable for high temperature and pressure applications. Ring type joint gaskets description leader ring type joint flange gaskets rtj gaskets are used in applications that involve extreme pressures and high temperatures. Rx weekijzerlow carbon steel 525kb rx ss316 527kb pressure energised adaptation of the type r. Flange faces raised face rf, flat face ff, ringtype joint.
Jul 18, 2014 ring type joint flange is a method of ensuring leak proof flange connection at high pressures. Lap joint from a bolt hole diameter, number of bolt holes, bolt circle diameter, outer flange diameter perspective, these flanges. This jointing method can be employed on weld neck, slipon and blind flange. The hardness of valve bonnet seal ring must be1520hb lower than the mating flange face hardness. Product data sheet fmoprtja rtj type orifice plates. For more highly specialised applications,ring type joints can be machined from duplex steels and other exotic materials such as monel,inconel. Thesealfacesofvalvebonnetsealring,includingthebevelfaces,shouldnthavethescratches. A ring type joint flange, abbreviated as rtjf, is a type of flange that uses a metal ring that sits in a hexagonal groove as a gasket to seal the flange pair. Dimensions and tolerances of ring joint gaskets type r. Novus sealing supply ring type joints which are fully approved to api.
Blind flanges are also used as a manhole cover in the vessel. Fluid sealing products represents garlock and unaflex on rubber expansion joints these joints are used to absorb movement reduce noise and system stress and compensate for misalignment. These types of flanges are used with another type of flange to isolate the piping system or to terminate the piping as an end. Unless other wise specified by the customer, ring type joint flanges will be furnished in accordance with these. Various types of flanges are available, depending on construction.
How to machine damaged rtj flanges mirage machines. Ring type joint flange is a method of ensuring leak proof flange connection at high pressures. Ring type joint rtj gasket basics and types mechanical. Nowadays it can be found on valves and pipework assemblies. Flanges include slip on flanges, blind flange, weld neck flange, socket weld flange, lap joint flange, orifice flange, spectacle blind flange, spades and spacers, anchor flange, swivel ring flange and bespoken flanges. Rovaal solid metal gasket for api or asme ring type joint flanges. Flanges have been successfully used in various types of pipe materials for over 100 years and their forms have been standardized for over 50 years. Lap joint flange welding neck flange blind flange screwed end flange socket welding flange flange faces provided. Extending out to the flange od has the added benefit of filling the gap between bolting surfaces. This factor preloads the gasket and creates a pressureenergized seal.
Gasket profiles and limiting values ring joint gaskets are made from metallic materials. The sealing surfaces on the ring joint grooves must be smoothly finished to 63 microinches and be free of objectionable ridges, tool or chatter marks. Orifice plates are recommended for clean liquids, gases and lowvelocity steam flows. Table with dimensions of stud bolts used with raised face and ring type joint flange connections, pressure class 300, asme b16. Flange facings the most common types of flange facings are. Orifice plates are recommended for clean liquids, gases and low velocitysteam flows. The dimensions are standardized and require specially grooved flanges. Successful sealing of problem flanges in high temperature. Lap joint from a bolt hole diameter, number of bolt holes, bolt circle diameter, outer flange. A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal.
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