EJMA STANDARD PDF
EJMA Standards: The Authority on Expansion Joints. The Standards of the Expansion Joint Manufacturers Association, Inc. are recognized. Standard edition was, of necessity, somewhat brief and covered only The EJMA TM Standards are intended for application to metallic bellows expansion joints. EJMA 8th Edition - - Ebook download as PDF File .pdf), Text File .txt) or read book online. EXPANSION JOINT STANDARD.
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EJMA was founded in to establish and maintain quality design and manufacturing standards. These Standards combine the knowledge and experience of. Project Engineering Standard This Project Standard and Specification covers general requirement for Expansion Joint Manufacturers Association (EJMA). Emiflex joints are built in accordance with EJMA standards and . The SPHERICAL EXPANSION JOINT differs from a standard lateral one, in that the hinges of.
Balasubramanian1, P. The expansion bellows at the Reactor Containment Building penetration of secondary sodium line of Prototype Fast Breeder Reactor PFBR experience axial, rotational and lateral duties at operating condition.
This bellow is part of reactor containment, and their structural integrity has to be ensured for desired containment performance. The design philosophies of bellow defers as they are thin shell members that work mostly in plastic domain.
While some standards are based on years of industrial practices and development, others are based on the structural integrity of a pressure vessel.
Expansion bellows are also used as inline components in the pipeline or in the components like pressure vessels, heat exchangers etc. As piping penetration bellows, they are part of reactor containment, and their structural integrity has to be ensured for desired containment performance.
Both of them have given the criteria for checking the stability and fatigue failure of the expansion joints using empirical relations [3, 4].
The average fatigue life predicted from the EJMA is based on industrial practices and development over many years. The life predicted from the ASME Section-VIII is based on criteria of structural integrity of a pressure vessel using factor of safety on the number of cycle and stress range .
It is observed that for safety related expansion bellows the design margin associated with them is lower than other safety related components. This higher design margin for other components warrants that the safety related expansion bellow in NPP should also be checked for consistent level of safety.
The codal comparison is performed against an expansion bellow located near RCB penetration, which is described in next section.
Secondary sodium circuit takes the heat from primary sodium flowing through the core in Intermediate Heat Exchangers IHX and in turn transfers the heat to water in steam generator. At normal operating conditions this pipeline is at C , whereas during the shutdown condition it is at C.
In case of draining of sodium from pipeline, it will reach the temperature of C. Expansion bellows will be approximately C lower than the pipeline temperature. High temperature of the line cause large thermal expansion and to accommodate this expansion four expansion bellows in series are provided at the RCB penetration.
Middle portion of the sleeve is welded with the embedment penetration EP on containment wall. Isolation of RCB will be jeopardized if there is any breach of structural integrity of these bellows.
Expansion bellows configuration outside the containment is shown in figure Two bellows with similar arrangement are inside the containment. The geometric details of these bellows are as given in Table-1 with their nomenclatures described in reference-2 and 3. The expansion bellow is made up of austenitic steel SSL.
Pressure load on the expansion bellows is very low and the stresses induced due to pressure are insignificant. Only significant load at the operating condition is thermal expansion of pipe segment between IHX and surge tank. Fatigue Life evaluation against various codes and standards are described in next section.
The relative displacement between the nodes across bellow is used for evaluation of its axial, rotational and lateral duty during NOC. The deformed shape of bellow is shown in figure Deformed shape clearly shows that apart from axial duty bellow also experience significant rotational and lateral duty. The equivalent axial displacement range for each convolution is given by equation The meridional membrane stress S3 , and meridional bending stress range S4 due to pressure is given by equation The total stress range due to cyclic displacement St is given by equation The notations have their usual meaning and given in reference Both give almost same equivalent axial duty except slight difference in lateral duty calculation.
The major differences between these two codes are in their fatigue curve. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Subscribe to this blog post Unsubscribe.
This would be a very good development as it will lead to more uniform design practices and less confusion. Related Content Customize your page view by dragging and repositioning the boxes below. Amazon Inspire Digital Educational Resources. It will also assist the user in communicating design requirements to the manufacturers and to properly install and maintain the expansion joint in service.
Some of the pressure design requirements in Appendix X could now be dropped, because they are now adequately staneards in the EJMA Standards. Subscribe to our newsletters or Click Link to View Archives. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. The main objective of the paper is to evaluate the standagds generated in the metal bellow and the cycle life working at different working pressures.
If your institution uses Shibboleth authentication, please contact your site administrator to receive your user name and password. This specification indicates the ordering information for each expansion joint, such as the dimensional limitations, internal liner, end fittings, and flow medium.
Fitness for Service 9 post s. The latter provides a significantly higher cycle life. Share your thoughts with other customers. The number of fatigue cycles can now be calculated from the same set of fatigue curves which are relevant for the unreinforced bellows and for the toroidal bellows.
He is President of Becht Engineering Co. In this paper, the stresses are calculated using Expansion Joint Manufacturing Association EJMA standards and compared with the results obtained using ANYS software for two different materials namely Inconel and Inconel for the pressure values ranging from 20 to 40 bar.
Process Consulting 10 post s. Due Diligence 5 post s.Von Mises stress distribution is shown in figure Expansion joints Industrial plants Bellows expansion joints Petroleum refinery piping.
While some standards are based on years of industrial practices and development, others are based on the structural integrity of a pressure vessel. Middle portion of the sleeve is welded with the embedment penetration EP on containment wall. While fatigue life evaluation in RCC-MR is based on the evaluation of total strain range in components, and comparing it with fatigue curve given in code.
The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. The deformation shapes are quadratic in both in-plane directions . It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. The element has six degrees of freedom at each node: translations in the nodal x, y, and z directions and rotations about the nodal x, y, and z-axes.
Secondary sodium circuit takes the heat from primary sodium flowing through the core in Intermediate Heat Exchangers IHX and in turn transfers the heat to water in steam generator.
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