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. As with all solid metal ring type joints including style r, it is. As the ring type joint material should always be softer than the mating flanges, the high seating stress causes plasticflow of the ring joint in the flange faces creating the seal. This jointing method can be employed on weld neck, slipon and blind flange.
Sep 03, 2018 design hub this video shows you flange facing type and gasket. Ring type joint gaskets r oval rx r octagonal r series ring type joint gaskets are manufactured to api6a and asme b16. Api ring joint gaskets come in two basic types, an oval cross section style 377 and an octagonal cross. Table 2 awwa c20718 class d ring flanges on coastal flange. The bx ring gasket differs from the standard oval or octagonal shape in that itis square in cross section and tapers in each corner. A lapjoint flange is a twocomponent assembly, with a stub end that has a lapjoint ring flange placed over it. The most commonly specified flange faces are raised face, ringtype joint, and flat faced. The type of flange to be used for a piping application depends, mainly, on the required strength for the flanged joint.
Available in standard low carbon steel, stainless steel 304 and stainless steel 316. Flanges are used, alternatively to welded connections, to facilitate maintenance operations a flanged joint can be dismantled quickly and conveniently. Available in both oval and octagonal configurations, both types are interchangeable on the modern octagonal type grooved flanges. Groove depth e is not included in flange thickness t but is included in the connection overall length l.
Nominal pipe size groove dimensions diameter of raised portion k. Slipon flange lap joint flange welding neck flange blind flange screwed end flange socket welding flange flange faces provided. Precision engineered flanges ring joint flanges class 150 facing dimensions. Rtj flanges are a good alternative to raised face in. It is always recommended that the gasket material be softer than the mating flanges. Ring joint gaskets are precision machined, metal gaskets. Technical catalogue rtj ring type joints comdiflex. For more highly specialised applications,ring type joints can be machined from duplex steels and other exotic materials such as monel,inconel.
The more commonly used ring type joint materials are soft iron, low carbon steel and different types of stainless steel. Dimensions for ring joint gaskets are in accordance to astm b16. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. More details are provided in another section of our wiki for piping.
Design hub this video shows you flange facing type and gasket. By applying pressure on the seal interface through bolt force, the softer metal of the gasket flows into the microfine structure of the harder flange material, and creating a very tight and efficient seal. Standard style r ring type joints are manufactured in accordance with both api 6a and asme b16. Flexitallic style r ring type joints can be manufactured in accordance with all relevant standards to suit the following flange designations. It is widely used in refinery, petrochemical and oil field drilling industries. The more popular ring type joint materials, with the recommended maximum hardness and identification as specified in api 6a,are shown in the table below. Marcel piping is renowed ring type joint flange manufacturers in india, a asme b16. Bx ring type joint gasket refers to the metal gasket of bxshaped section by processing metal materials. A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal. Rx ring gaskets are similar in shape to the standard octagonal ring joint gasket but their cross. The stub end is then butt welded to the pipe, and the flange ring can be rotated to align with the mating flange. Available from stock inventory in a variety of materials are styles r r octagonal rx bx.
A ring joint flanges rtj is used when a metaltometal seal between the mating flanges is required which is a condition for highpressure and hightemperature applications, i. The last type of forged product that resembles the shape of a flange is the socalled spectacle blind. The flanges seal when the bolts are tightened and the gasket is compressed into the groove making a metal to metal seal. This type of flange is used in high pressure and temperature services. 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. Raised face flat face ring type joint tongue and groove male and female din flange summary chart rated pressure in bar 1 bar 14. The rtj type orifice plate incorporates an integral gasket, either oval or octagonal ring, for mounting between ring type joint flanges. 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. The ring type joint blind flange usually come in blind, slipon, threaded and weld neck. 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 types of flanges for piping explained projectmaterials. 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. A wide variety of ring type joint blind flange options are available to you, such as iso, ansi, and jpi. Flange faces raised face rf, flat face ff, ringtype. Pressure rating at atmospheric temperature is 175 psi for sizes 12 and under and 150 psi for sizes 14 and up. Lamons is licensed by the american petroleum institute api. Ring joint type face flange has a specially designed grove in which metal gasket seat. The most vulnerable element of a piping system is the joint. Rubber coated ring type joints this is an octagonaloval section ring type joint generally soft iron or low carbon steel totally enclosed in a nitrile rubber coating. Standard ring type joints are manufactured to meet both api 6a and asme b16. The rtj standard size gaskets are manufactured in accordance to api6a and asme b16. Stud bolts dimensions for raised face and ring type joint. 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. Ringjoint, spiralwound, and jacketed ring type joint. This type of flange connection is particularly useful for large or hardtoadjust flanges.
The inside bore circle type of gasket is used with a raised face flange. Rtj flange, ring type joint rtj flanges manufacturers. The ring type joint gaskets are either octagonal or oval in crosssection. The ring type joint was initially developed for high pressure up to 1500 bars and. Some sizes of bx ring type joint gaskets should have the pressure hole through the ring cross section.
Flange facing type and gasket part10pipe designasme b31. B d mm size inch code weight lb d1 mm d2 mm h mm b. The ring type joint rtj gasket is a forged ring that fits into the machined groove of an rtj flange. Surface finish of the style r ring type joint sealing faces radiused ends of an oval and the 23 angled faces of an octagonal shape shall not be greater than 1.
The most commonly used standard that covers dimensional information on flange types and flange faces used in process piping systems design to asme b31. Nominal pipe size, groove dimensions, diameter of raised portion k. Founded in 1992, wolar has become one of the largest ring type joint manufacturer in the world. An slip on flange ring type joint usually has a raised face with the groove machined into the face of the flange. Rtj gaskets can be produced from a variety of materials to suit the process application and flange grade. Also, ringjoint groove dimensions were not included, because they were included in asme ansi b16. Flange faces raised face rf, flat face ff, ringtype joint. Ring type joint gaskets rtj gaskets are typically manufactured to api 6a wellhead equipment 17d subsea ring joint gaskets and asme b16. Rtj face dimensions and flange tolerances pdf for printing. Ring joint flanges catalogue hydraulic and offshore supplies. Noble model m12pi a ring type joints with ptfe inserts m12 model rx ring type joints. It has good sealing as the contact between gasket and the ring joint faces, especially the outside face, and is pressed tightly to keep good sealing performance.
Whether you are looking for a standard ring type joint gasket or a custom design, call one of our sales professionals who will work to find the right solution for your specific application. Rtj flanges have grooves cut into their faces which accept steel ring gaskets. Ring type joint rtj gasket basics and types mechanical. Learn different types of pipe flanges used in piping. Rtj r 20 316 oval ring type joint gasket r oval profile, size 20, stainless steel 316 hitech gaskets stocks ring joint gaskets in r oval, r octagonal, rx, and bx styles. The more popular ring type joint materials, with the recommended.
Ring type joint gaskets are designed to seal by initial line contact or wedging action between the mating flange and the gasket. Unless other wise specified by the customer, ring type joint flanges will be furnished in accordance with these. Flange ring, twopiece corrosion resistant flange backing rings the split ring design allows for a flange ring to be added after a flange adapter has been joined to the pipe for retrofit purposes. Browse awwa flanges in the coastal flange catalog including table 2 awwa c20718 class b ring flanges,awwa c20794 class b hub flanges,table 2 awwa c20718 class d ring flanges,table 3 awwa c20707 class d hub flanges,table 4 awwa c20707 class e hub. The flexitallic group is the international market leader in. Lamons manufactures and supplies a large variety of ring joint gaskets. An rtj flange usually has a raised face with the groove machined. Ansi rtj flanges cl150cl2500 ansi ring type joint flanges. The most commonly specified flange faces are raised face, ring type joint, and flat faced. It is based on proven technology, has no moving parts and is suitable for hightemperature and highpressure applications. A rtj flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together, usually has a raised face with the groove machined into the face of the flange. All categories awwa flanges table 2 awwa c20718 class d ring flanges view items. Ring type joint flange face surfaces are an increasingly popular option with regards to flange connections.
Bx ring type joint gaskets,china bx ring type joint gaskets. Many times, the weakest part of the joint is the gasket that is used. Dimensions and tolerances are in accordance with asme b16. The flange face is the surface area that hosts the gasket. Apr 12, 2018 the ring type joint rtj gasket is a forged ring that fits into the machined groove of an rtj flange. Rtj gaskets are generally used for high pressure and hightemperature applications. Characteristics gasket profiles and limiting values. Also, ring joint groove dimensions were not included, because they were included in asme ansi b16. Rtj face dimensions and flange tolerances texas flange. Ring type joint flange is a method of ensuring leak proof flange connection at high pressures. Rf, ff, rtj flange face and finish projectmaterials. Widely used in pressure testing procedures, minimising damage to the flange. It is of pressure energized seal in radial direction, one special kind of octagonal metal ring gaskets. Bx ring type joint gaskets,china bx ring type joint.
46 899 298 692 582 72 909 653 516 1296 998 1221 356 828 843 271 382 905 1488 615 2 1183 242 657 739 1391 81 1245 869 1019 41 732 827