The gasket is removed and is replaced by the loads it generates. The big problem is that the load on the gasket cannot be measured directly and easily during installation. The require thickness of a dished semiellipsoidal head in which onehalf of the. P guidance on troubleshooting flanged joint leakage incidents 90 iv. Calculation of rectangular flanged joints springerlink. Flange weight chart, stainless steel flanges weight chart, carbon steel weight chart, wn flange weight chart, weight chart of ss flange, blind flange weight, flange weight chart in kg. Additionally, the bolts and flanges must be robust enough to prevent warpage, distortion or separation during service. Thus the accuracy of measurement differential pressure transmitter could be maximized.
Also, the range of use of the different standards and the calculation algorithm are discussed. Most company has their flange bolt torque tightening procedure that used during construction and operation of the plant. Pdf joint strength of gasketed bolted pipe flange joint. Proper controls must be exercised in the selection and application for all these elements to attain a joint that has acceptable leak tightness. Some of the various load types include tensile, shear and bending. Bolt stresses as a function of torque are available in standard handbooks.
Method for calculating stud bolt lengths for flanged connections. The calculation by means of a formula 6 is very com. Flanged fittings mj fittings mj accessories pushon fittings fabricator products protecto 401 lined fusion bonded epoxy mechanical joint restraints. When a joint or joint design is already available, the calculations can be made in a reverse manner. Design and analysis of the flangebolted joint with respect to. Very little extra effort is required to restrain a mechanical joint fitting after the tbolts have been tightened.
Based on the numerical calculation the following results were analyzed. Kopflex brand flanged universal joints are available in sizes from 58mm to 620mm swing 2. Pressure vessel flanged dish head design tool calculator. Bolted joints bolt load and tightening torque when using bolts to fasten the sealing joint the bolts must be of suitable strength and quantity to compress the seal and withstand the maximum hydrostatic load. Too little applied stress results in excessive leakage. Very few people in the world truly understand the complexities of the bolted joint and even fewer can provide practical guidance on how to eliminate joint leakage. And due to the flange deflection, the distribution of gasnet stress in the radial direction is not. Calculation of the required bolt area for stiffness calculation. Understanding european flange design rules en 15911. There are three major components of every bolted joint. According to asme, to understand the importance of bolted joint assembler training, it is worthwhile to compare bolted joints with the current practices for other pressure boundary joints.
Bartonicek2 1 amtec services, lauffen, germany email. Joint pdf calculation example 1 consider random variables x,y with pdf fx,y such that fx. Pressure vessel design, formula and calculators engineers edge. Second, cen the european committee for standardization republished en1591 part 4 with modifications as a standard, now entitled flanges and their joints part 4. A complete analysis of the entire assembly needs to be completed to ensure flanged joint reliability. Such systems are ansi awwa standards particularly suited for above ground installation in the following. Bolted flanged joints pressure vessel and piping bolted flanged joints are one of the most complex items of equipment to analyse at any plant. Analysis of leakage in bolted flanged joints using contact finite element analysis 6 fig. The summary of flange data listed below is offered as a guide to assist designers in selecting the most economical flanges for their piping system. Bolted flanged joints, proceedings of the 1994 pressure. Star pipe products ductile iron pipe fittings, joint.
Two methods are also used to estimating the bolt load actually applied on the bolted joint. However, an additional set of requirements for successful joint assembly and integrity includes bolt load calculation software, trained and compe. If the flanged pipe joint is subjected to a moment m, then maximum bolt tension of the flanged pipe joint can be found by taking moment at the center of the pipe which gives the equation for maximum bolt tension as shown in equation 1. This will allow the flange to be fitted in place and checked for gross alignment before being welded to the pipe joint so that bolt hole alignment, and correct distance between the flanges can be verified. Ductile iron flanged pipe for water and other liquids. Brown, charles morrow, samuel durbin, and allen baca prepared by sandia national laboratories albuquerque, new mexico 87185 and livermore, california 94550 sandia is a multiprogram laboratory operated by sandia corporation. A flanged joint is composed of separate and independent, although interrelated components. Flanged universals are also commonly known as yoke. See the instructions within the documentation for more details on performing this analysis.
The socket design provides a smoothbore through the joint significantly reducing erosion potential from multiphase fluids. Determination of bolt torque for flanged connections. For fea the bolt length is cut on the center of the gasket. Pressure vessel pipe circumferential stress longitudinal joints.
This effective width calculation removes any possible correlation between asme flange calculation methods and flange manufacturers provided m and y values. Additionally, the asme code is the basis for the flange calculation in the european. The underground use of the flanged joint is generally not recommended due to the rigidity of the joint and as noted in appendices of appropriate ansiawwa standards. The flanged joint is modelled and simulation using ansys 14 soft ware. When bolted joint components during the initial tightening phase, the contact.
Flanged pipe and fittings are typical components in rigid piping systems. Flanged pipe is rated for a maximum working pressure of at least 250 psi. Carbon steel pipe flanges with an extensive carbon steel inventory, shree steel india carries a wide range of carbon steel pipe flanges in a variety of sizes and pressure ratings to meet your projects needsincluding hardtofind configurations and sizes. Calculation of bolted flange connections nc state repository. The ability to predict the leak tightness of a flanged joint is discussed by the authors. Pdf the design of flanges based on flexibility and tightness. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. The height of a nut for a stud bolt is the same as the diameter of the thread rod. Flange bolt torque sequence and torque table a complete. The key element to an effective sealing hdpe flanged joint, is to torque the bolts to a sufficiently high value to stretch the bolts, so that the ljf is flexurally distorted, and the hdpe flangeface sufficiently and continuously compressed. En 1591 flange calculations the academy of joint integrityflexitallic are able to offer flange calculation services to bs en 15911 as follows. Split lines can be seen where the gasket loads ht and hg are applied. Pdf design and analysis of the flangebolted joint with respect to.
Flange calculator pipe, piping including database calqlata. Joint design joint design loads can be applied to bolted joints in a number of different ways, each of which produces unique effects on the joint. The stud bolt theoretical length can be calculated by means of the formula. Pdf stress analysis of flanged joint using finite element. The calculating relationships required for determining the desired optimal gasket width, on which the leaktightness of the joint, materials consumption, and cost of the joint depend, are presented. J calculation of target torque 68 k nut factor calculation of target torque 69 l asme b16. Key wordsflanges, bolted flange connections, flanged joints, gasket factors, gasket characteristics, calculation. The bolted joint analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. Pressure vessel engineering and design equations and calculators the following are to links tp pressure vessel. Flange calculations the academy of joint integrity. Stargrip ductile iron pipe pvc stargrip pvc pipe pvc grip pvc pipe starflange adapter flange di pipe pvc starflange adapter flange pvc pipe flange adapters ductile iron and. Gaskets basics, types, working principle, calculation of.
In this paper, all parameters which influence the function of the bolted flange connection are considered. Joint integrity management of critical flanges sciencedirect. The optimum bolt load will need to cater for minimum bolt loading conditions, thermal relaxation, allowances for inaccuracies in the type of bolt tightening equipment used, the strength of the flanges and the strength of the gasket. Contact area between the gasket and the flange is lost as the internal pressure is increased. Calculation method bs en 15911 defines a calculation method for bolted, gasketed, circular flange.
The study of asme part b flanged joints described in this report is a portion of a. Box 5800, ms0501 sandia national laboratories albuquerque, nm 87185 abstract this document provides general guidance for the design and analysis of bolted joint connections. These effects result from the way the joint is loaded, as well as how the joint responds to the load. A sequence of load steps depicting the loading history of a joint and leakage development is shown in fig. An example of calculation of the width of a fluoroplastic4 teflon gasket is given. Flange joint synonyms, flange joint pronunciation, flange joint translation, english dictionary definition of flange joint. Flange joint definition of flange joint by the free dictionary. Calculation of flanged joint with optimal gasket width. Bolt tightening sequence or torque sequence is defined in torque tightening procedure. Ebaa mechanical joint restraint products utilize accepted assembly procedures to seal the joint, then the simple tightening of wedges to restrain the joint. View abstract product details document history din 25052 complete document 1990 edition, april 90. A bolted joint is an assembly that relies on each component to work properly. The following are equations and a calculator to determine the wall thinkness and working pressure of an ellipsoidal head with tl greater than or equal to 0.
When selecting a bellows from the catalog data pages that will have flanged connections, it is important that the system designer confirm that the flanges he has selected have an adequate pressure. Bolted flanged joints ies integrity engineering solutions. A detailed 3d nonlinear finite element analysis is performed to study the strength and sealing of a gasketed bolted flanged pipe joint under different boltup strategy industrial and asme and. The performance and success of the bolted joint depends on the quality and design of each of these components. The joint is at equilibrium, with the compressive sealing. Pressure vessel engineering and design equations and calculators the following are to links tp. Standards and stress analysis of flanged joints 1978. Tyl085409 tyler union 2 in ductile iron mechanical accessory. These comparisons indicate that the calculation methods used in the text of. Telescoping, or sliding, center shafts are available as standard, or fixed length shafts can be supplied. Brown, charles morrow, samuel durbin, and allen baca p. The finite elemen t analysis proced ure required in ansys simulation is presented as a predefined proc ess to obtain accurate. Leak tests at real bolted flange joints verification of.
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