B16 standardization of valves, flanges, fittings, and. All valves, fittings, flanges, and unions shall be marked with the manufacturers name, trademark, or. A universally accepted code for shell and tube exchangers is tema 1988, which although designed to supplement asme viii, can be used in conjunction with other pressure vessel codes. These are used mainly at equipments, valves and specialties. In certain pipelines where maintenance is a regular feature, breakout flanges are provided at definite intervals. Socket weld flanges were initially developed for use on smallsize high pressure piping. Keep reading for brief descriptions of the most common types of ansicompliant flanges. Flanges general materials for flanges according to. In astm, din, bs, en, jis,as, gb, gost standard flanges, they all have their own material request, when arrange the production, the raw material should be confirmed first. Tema specifies minimum thicknesses, corrosion allowances, particular design requirements, tolerances, testing requirements, aspects of operation, maintenance and. The type of flange to be used for a piping application depends, mainly, on the required strength for the flanged joint. Although they come in different configurations, many sae 4bolt hydraulic flanges look quite similar to each other. Fabricated from 304l stainless steel tubing and knifeedge cf flanges.
Api flanges are marked with the api monogram a registered trademark, size, pressure rating, ring gasket size, bore, manufacturer, and a heat number. These types of flanges are used in high pressure and temperature application. Providing support and strength, two flanges are typically attached to pipe ends with a gasket in between. Different api ring gaskets type r, rx, and bx are used for flanges and clamp type connectors. Flanges are used, alternatively to welded connections, to facilitate maintenance operations a flanged joint can be dismantled quickly and conveniently. Flange definition and information china hebei haihao.
The asme performance test codes provide standard directions and rules for conducting and reporting tests. Whether you need ansi flanges or asme flanges, forged components, inc. Lap joint flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they. An overview of all investigated welding neck flanges and most important topics is. Flex metal edgewelded and hydraulically formed bellows available. For example, a carbon steel pipe can be identified with grade a or b, a stainlesssteel pipe with grade tp304 or grade tp321, a carbon steel fitting with grade wpb etc below you will find as an example 3 tables with chemical requirements for. Gb150 the rules found in the design codes represent many years of experience. A survey of one of the most important pressure pipe codes asme b31, earlier known as ansi b31. Api 605 flanges are designated series b flanges in asme b16.
O ratings jis and din flanges ansi flanges rated in kgcma. Welding codes and how theyre used son set consultants. The ring type joints are manufactured as per asme b16. Blind flanges are also used as a manhole cover in the vessel. For high temperature applications the applicable codes should be consulted for material selection and other design criteria.
Based on flange facing types, it can be further classified as. These may be either smaller or large diameter flanges and as you would expect, there are a variety of different styles of ansi flanges used by process engineers across a wide range of industries. Flanges table, flanges dimensions, flanges standard chart, flanges size chart india. As per different standard, the material may have different codes, the chemical composition and mechanical properties are different. Their static strength is equal to slip on flanges, but their fatigue strength 50% greater than doublewelded slip on flanges. All asme codes are developed using input from a range of parties, who may be interested in the code andor in the associated equipment or process. Threaded flange threaded flanges are joined to pipes by screwing the pipe which has a male thread, generally npt per asme b1. Codes, standards and recommended practices the process piping. Considerable assistance has been drawn from bs 4504. Types of gaskets for flanges soft, spiral, ring joint. In addition to the boltholes centertocenter dimensions, other physical differences exist between the sae code 61 and the sae code 62 4bolt flanges. Learn about types of flanges threaded,socketweld,slipon,lap joint,weld neck,blind flanges. Flanges can leak so, in general, the use of flanges is limited to making connections to flanged equipment, valves, and inline components.
Pn on the other hand is max pressure rating in barg. This standard applies to new valve construction and covers quarterturn. Learn different types of pipe flanges used in piping. It ranged from the early impetus, given by the sultana and baltimore hydrant disasters, to the present system of standard writing, conformity assessment and. How to specify hydraulic flanges main manufacturing. Asme american society of mechanical engineers asme is one of the leading organizations in the. Two flanges are joined together with bolts or studs and have a gasket between them. The video you have just seen, an introduction to codes and standards, gave you a quick tour of the asme involvement in codes and standards. The engineer or designer must choose among several flange options. Ansi american national standards institute ansi provides a forum for development of american national standards. The fluid supplier should be consulted for the appropriate oring material. The difference between api and ansi flanges is fabrication material and working pressure. Moreover, twenty new flanges with different sizes and rating classes, manufactured in carbon steel conforming to astm a105 have been ordered at one supplier stockist. Yet pipework is generally limited by the flanges not the valves, every one just specifies that valves are rated to b16.
According to ansi standards, each flange is stamped with identifying marks. Nash international journal of pressure vessels and piping 81 2004 6774. Codes and standards piping codes and standards asme, ansi, astm, aga, api, awwa, bs, iso, din and more related documents. Flanges clamped together selection of flanges a flange is specified by the following in. Beginning in 1920, the asme b16 committee assumed responsibility for developing codes and standards related to valves, pipe flanges and fittings. Flanges table, flanges dimensions, flanges standard chart, flanges size chart we export. To refresh your memory, lets take a look at six different types of flanges. These types of flanges are used with another type of flange to isolate the piping system or to terminate the piping as an end. Certain ambient temperature standards and practices have a different range or are limited by recognized codes and standards.
They are dimensionally suitable for use with flanges manufactured. A flange is usually in the shape of a disc and is used to connect two tubes together or to connect a pipe to a valve, tee, choke or other component. Welding codes and how theyre used almost all design, welding, fabrication, material, repair, testing, and inspection requirements are covered under three main governing organizations. The latest version provides dimensions and ratings in both metric and inch units. Depending on its own special characteristics and specific functions, these flanges are generally classified into 9 types. These two types do not differ only in their geometrical design, but also the function of the two types is completely different. Connections between different diameters isokf flanges 10, 20 and 32 mm nominal diameter flanges have the same external dimensions as 16, 25 and 40 mm, so the 1016, 2025, 3240 connections are very easy, using an adapter ring with the o. Standard marking system for valves, fittings, flanges, and. It is a forged ring that fits into the machined groove of an rtj flange. The types of flanges for piping explained projectmaterials.
The committees published body of work includes standard dimensions and pressuretemperature ratings for gray iron flanges and fittings asme b16. Types of asmeansi flanges the american national standards institute ansi calls for the use of an ansi flange to be used on specific applications. Pocket guide to flanges, fittings, and piping data. The material to be used is determined by the temperature and the fluid. These two standards have different pressure deratings at elevated temperatures with the flanges having a higher pressure rating in the copies that i use. Flanges are used when the piping joint needs dismantling. Many different materials and some different designs are available but the most common material used is buna n. The fact that there is a flange capable of higher rating is irrelevant. The connection with the pipe is done with 1 fillet weld, at the outside of the flange. With regard to their stabilitytemperature property, the material s 1. A flanged joint is composed of three separate and independent although interrelated components. This standard covers minimum requirements for class 150 and 300 cast ductile iron pipe flanges and flanged fittings.
Even the department of defensedod has either adopted many of these codes, or used them as a basis to develop their own codes known as milspecs. Additional decisions involve facing and surface finishes, and the appropriate. Nonetheless, sae code 61, sae code 62, and caterpillar 4bolt flanges, in particular, exhibit small dimensional and physical differences that cannot be ignored. Other major ansi asme standards refereed for the piping elements are. The dimensions and weights of slipon flanges ansiasme are available on this page. Long weld neck flange dimensions socket weld flange dimensions slip on. Material control of flanges include, its receiving, applying commodity code number, storage, and their shipping. Ring type joint rtj gasket basics and types mechanical. Carbon steel pipe, fittings and flanges atlas steels. Other than the code above, the most commonly codes used for pressure vessels are.
A closer look at 6 different types of flanges world wide. Learn about the 5 key flange gaskets types used in the oil and gas industry. A flange is an external or internal ridge, or rim lip, for strength, as the flange of an iron beam such as an ibeam or a tbeam. It addresses gaskets that are dimensionally suitable for use with flanges described in reference flange standards asme b16. Flanges were obtained from three different manufacturers together with en10204. The ansi flange is a threepart flange consisting of one flat flange, one flange machined to take a rubber oring and the rubber oring. Temperaturepressure ratings for carbon steel plate flanges. Codes have the force of a legal document when cited in contracts, as they frequently are, for determining the method by which equipment performs as guaranteed. Specifications the material of the flanges delivered is aisi 316l with the material number 1. Standard marking system for valves, fittings, flanges. Cast iron and similar special piping sections are commonly joined by flanges and, for sizes of dn 50 and above, require careful space and.