Nominal pipe size, groove dimensions, diameter of raised portion k. The most commonly used standard that covers dimensional information on flange types and flange faces used in process piping systems design to asme b31. Ring joint type face flange has a specially designed grove in which metal gasket seat. The last type of forged product that resembles the shape of a flange is the socalled spectacle blind. Marcel piping is renowed ring type joint flange manufacturers in india, a asme b16. Technical catalogue rtj ring type joints comdiflex. Available in standard 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. Flexitallic style r ring type joints can be manufactured in accordance with all relevant standards to suit the following flange designations. Characteristics gasket profiles and limiting values.
Rtj flanges have grooves cut into their faces which accept steel ring gaskets. Ring type joint gaskets are designed to seal by initial line contact or wedging action between the mating flange and the gasket. Rtj face dimensions and flange tolerances texas flange. 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 ring type joints are manufactured to meet both api 6a and asme b16.
Many times, the weakest part of the joint is the gasket that is used. The rtj type orifice plate incorporates an integral gasket, either oval or octagonal ring, for mounting between ring type joint flanges. It is based on proven technology, has no moving parts and is suitable for hightemperature and highpressure applications. A wide variety of ring type joint blind flange options are available to you, such as iso, ansi, and jpi. Ringjoint, spiralwound, and jacketed ring type joint. Flange faces raised face rf, flat face ff, ringtype joint. The more commonly used ring type joint materials are soft iron, low carbon steel and different types of stainless steel. This type of flange is used in high pressure and temperature services. Groove depth e is not included in flange thickness t but is included in the connection overall length l. Rtj face dimensions and flange tolerances pdf for printing. Ring joint gaskets are precision machined, metal gaskets. The ring type joint blind flange usually come in blind, slipon, threaded and weld neck. Stud bolts dimensions for raised face and ring type joint. The flanges seal when the bolts are tightened and the gasket is compressed into the groove making a metal to metal seal.
Unless other wise specified by the customer, ring type joint flanges will be furnished in accordance with these. The most vulnerable element of a piping system is the joint. The ring type joint material is selected in order to suit the application conditions. Dimensions for ring joint gaskets are in accordance to astm b16. The most commonly specified flange faces are raised face, ring type joint, and flat faced. Rx ring gaskets are similar in shape to the standard octagonal ring joint gasket but their cross. Nominal pipe size groove dimensions diameter of raised portion k. Rtj flanges are a good alternative to raised face in. Table 2 awwa c20718 class d ring flanges on coastal flange. 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 rtj standard size gaskets are manufactured in accordance to api6a and asme b16.
As a familyowned minority business, we remain flexible to. An rtj flange usually has a raised face with the groove machined. Ansi rtj flanges cl150cl2500 ansi ring type joint flanges. Slipon flange lap joint flange welding neck flange blind flange screwed end flange socket welding flange flange faces provided.
Bx ring type joint gaskets,china bx ring type joint gaskets. 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. 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. B d mm size inch code weight lb d1 mm d2 mm h mm b. Also, ringjoint groove dimensions were not included, because they were included in asme ansi b16. Ring joint flanges catalogue hydraulic and offshore supplies. Flange facing type and gasket part10pipe designasme b31.
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. The more popular ring type joint materials, with the recommended. All categories awwa flanges table 2 awwa c20718 class d ring flanges view items. A ring joint flange features a circular groove to accommodate a ring joint gasket oval, or rectangular. Ring type joint flange is a method of ensuring leak proof flange connection at high pressures. Rtj gaskets are generally used for high pressure and hightemperature applications. A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal. Apr 12, 2018 the ring type joint rtj gasket is a forged ring that fits into the machined groove of an rtj flange. The flexitallic group is the international market leader in. Bs 300 slip on flanges, ring type joint rtj dimension. Also, ring joint groove dimensions were not included, because they were included in asme ansi b16. Lamons manufactures and supplies a large variety of ring joint gaskets. 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. 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.
The inside bore circle type of gasket is used with a raised face flange. It is of pressure energized seal in radial direction, one special kind of octagonal metal ring gaskets. Flange faces raised face rf, flat face ff, ringtype. Flanges are used, alternatively to welded connections, to facilitate maintenance operations a flanged joint can be dismantled quickly and conveniently. Widely used in pressure testing procedures, minimising damage to the flange. Dimensions and tolerances are in accordance with asme b16. The most commonly specified flange faces are raised face, ringtype joint, and flat faced.
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 gaskets rtj gaskets are typically manufactured to api 6a wellhead equipment 17d subsea ring joint gaskets and asme b16. Standard style r ring type joints are manufactured in accordance with both api 6a and asme b16. Ring type joint gaskets r oval rx r octagonal r series ring type joint gaskets are manufactured to api6a and asme b16.
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. Founded in 1992, wolar has become one of the largest ring type joint manufacturer in the world. Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. Table with dimensions of stud bolts used with raised face and ring type joint flange connections, pressure class 300, asme b16. The ring type joint gaskets are either octagonal or oval in crosssection. 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. Bx ring type joint gaskets,china bx ring type joint. Noble model m12pi a ring type joints with ptfe inserts m12 model rx ring type joints.
Design hub this video shows you flange facing type and gasket. 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. Precision engineered flanges ring joint flanges class 150 facing dimensions. Sep 03, 2018 design hub this video shows you flange facing type and gasket. For more highly specialised applications,ring type joints can be machined from duplex steels and other exotic materials such as monel,inconel. Bx ring type joint gasket refers to the metal gasket of bxshaped section by processing metal materials. Ring type joint rtj gasket basics and types mechanical. Some sizes of bx ring type joint gaskets should have the pressure hole through the ring cross section. The types of flanges for piping explained projectmaterials. Available in both oval and octagonal configurations, both types are interchangeable on the modern octagonal type grooved flanges.
A lapjoint flange is a twocomponent assembly, with a stub end that has a lapjoint ring flange placed over it. The type of flange to be used for a piping application depends, mainly, on the required strength for the flanged 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. 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. The flange face is the surface area that hosts the gasket. The flexitallic group is the international market leader. The stub end is then butt welded to the pipe, and the flange ring can be rotated to align with the mating flange. Rtj gaskets can be produced from a variety of materials to suit the process application and flange grade. 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. Rf, ff, rtj flange face and finish projectmaterials. Api ring joint gaskets come in two basic types, an oval cross section style 377 and an octagonal cross. The bx ring gasket differs from the standard oval or octagonal shape in that itis square in cross section and tapers in each corner. Pressure rating at atmospheric temperature is 175 psi for sizes 12 and under and 150 psi for sizes 14 and up.
Raised face flat face ring type joint tongue and groove male and female din flange summary chart rated pressure in bar 1 bar 14. Learn different types of pipe flanges used in piping. 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. Rtj flange, ring type joint rtj flanges manufacturers. This type of flange connection is particularly useful for large or hardtoadjust flanges. Orifice plates are recommended for clean liquids, gases and lowvelocity steam flows. The ring type joint rtj gasket is a forged ring that fits into the machined groove of an rtj flange. It is always recommended that the gasket material be softer than the mating flanges. It is widely used in refinery, petrochemical and oil field drilling industries. An slip on flange ring type joint usually has a raised face with the groove machined into the face of the flange. Available from stock inventory in a variety of materials are styles r r octagonal rx bx. This jointing method can be employed on weld neck, slipon and blind flange. Lamons is licensed by the american petroleum institute api.