Ejma Standards
Jkobe Peoples
The EJMA Standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type expansion joints for safe and reliable piping and vessel installation. The Tenth Edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable reference document.
EJMA Standards: The Authority on Expansion Joints
The EJMA Standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type expansion joints for safe and reliable piping and vessel installation. The Tenth Edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable reference document.
The Expansion Joint Manufacturers Association is an organization of metal bellows expansion joint manufacturers. It was founded in 1955 to create and maintain a set of standards for quality expansion joint design and manufacturing.[1] The EJMA standards are used worldwide as a reference for the proper selection and application of metallic bellows expansion joints. The standards are a combination of a variety of expansion joint manufacturers' knowledge and experience.[2][3]
The EJMA organization performs extensive technical research on a variety of topics concerning the design and manufacturing of expansion joints.[4] This knowledge contributes to providing new versions of the EJMA book of standards.
For more than a half century Hyspan has provided advanced flexible solutions with metal bellows expansion joints and hose assemblies in Scientific and Laboratory ultra-high vacuum (UHV) applications. Particle accelerators, magnetic fluids, thermo-acoustics, and other processes are supported for thermal motions, pump connections, installation clearances, system alignment, seismic allowances, and building settlement.
Build-to-print is typical for this industry. Replacements and reverse-engineered solutions are commonly provided. New designs can comply with EJMA standards if required. Our customer base is extensive, including LIGO, NIF, CERN, and many laboratories.
Hyspan is an ISO 9001:2015 registered company with a quality system that supports requirements of the piping and boiler pressure vessel codes. These include popular ASME B31.1, ASME B31.3, and ASME Section VIII Division 1 codes. European Pressure Equipment Directive (PED) standards, with CE markings, can be supported in many applications. Canadian Registration Number (CRN) support is available.
Nondestructive testing and inspections are performed by company personnel including radiography. Quality personnel are certified to the standards of the American Society of Nondestructive Testing (ASNT). Hyspan is a member of the Expansion Joint Manufacturers Association (EJMA ). A copy of our Hyspan EJMA certificate is available.
We believe in a design process that prioritizes uninterrupted operation and failure prevention. Our team uses cutting-edge design tools to examine every aspect of an expansion joint, ensuring structural integrity and optimal performance.
Our toolkit includes custom EJMA 10th Edition software, Creo 3D solid modeling, and comprehensive FEA capabilities. This arsenal allows us to tackle design challenges, meeting the high standards of major industry players like Marathon, ExxonMobil, Phillips 66, Valero, Chevron and Shell.
Thank you to Valtech for the informative Lunch and Learn presentation you put on last week. Our engineering, quality, maintenance, and procurement attendees came away much more knowledgeable on the subject of expansion joints. We are now better informed to understand our refineries expansion joints.
Our custom software allows for precise design of bellows and hardware, adhering to the latest EJMA standards, along with ASME boiler and pressure vessel codes. This precision ensures that every expansion joint we design is optimized for durability and performance.
Yes, we specialize in tailoring our designs to meet unique specifications. Our use of Creo 3D modeling and comprehensive FEA techniques allows us to create custom solutions that fit the demands of each project.
Our team's expertise with specifications from industry leaders like Marathon, ExxonMobil, Phillips 66, ensures that our designs exceed industry standards. This expertise results in expansion joints that are reliable, efficient, and tailored to the stringent requirements of major players in the industry.
It was founded in 1955 to establish and maintain design and manufacturing standards. These standards combine the knowledge and experience of the association's Technical Committee and are available to assist users, designers, and others in the selection and application of expansion joints for the safe and reliable installation of pipes and containers.
Since 1958, when the EJMA first published these standards, continuous technological improvements in the application and design of Expansion Joints have been reported through the cooperative efforts of their association members in expanding the scope and content of this standard publication. The first edition of the EJMA standard was, by necessity, somewhat brief and covered only applications involving axial motion. But as the results of extensive research and testing were catalogued, more detailed design data was included in the EJMA standard.
The standards are designed to apply to metal bellows expansion joints having only the convolution shapes shown in the standards and having convolution welds only in the meridional direction with the exception of bellows joint welds.
EJMA standards are recognized throughout the world as the authority on the proper selection and application of metal bellows type expansion joints for the safe and reliable installation of pipes and vessels. The 10th edition standards combine the knowledge and experience of the leading expansion joint manufacturers in one invaluable reference document.
With each printed copy of the tenth edition, EJMA adds an EJMA Practical Guide to Expansion Joints, a pocket guide based on the EJMA standards that is intended to provide users with a basic understanding of expansion joints and help the user to communicate design requirements to manufacturers and to properly install and maintain the expansion joint in service.
In cases where the bellows integrity under pressure is not validated by the results of the design calculations using EJMA standards and the geometric complexity indicates the need for further optimization of the project, Giorgi Engineering can verify the integrity of the product with finite element analysis (FEA), using ANSYS software.
The technical approval and the results of the analysis obtained in accordance with the terms of the specified design standard are provided as a technical documentation package, complete with valuation reports.
The company has introduced a dedicated software to manage traceability of all the materials used in any specific order, integrating this with our design software and guaranteeing the integrity of all the materials used. The software also produces reports of the internal tests and quality inspections results.
The reports can be sent separately or supplied with the bellows, allowing the client to reduce facility downtime to the minimum before the installation.
This rapidity in supplying the documentation ensures that at the time of the offer the client already has all the technical details necessary to make an informed evaluation of the proposed standard and personalized solutions, such as the project specifics, Industry 4.0, and the project code.
The modern skyscraper has been around for over a century. Like other elements of our built environment, the skyscraper can only exist because of other innovations in building technology, namely steel frame construction and safe elevators. Even though we have figured out how to build strong, tall structures and safely move the people inside, there are still the challenges of heating and cooling the building, moving fresh water in and dirty water out, providing fire protection and electricity. Defying gravity adds another twist to the challenges of providing services within tall buildings. This article will introduce some basics of pipe riser design and performance, explain some considerations in using different expansion joints in pipe risers, and briefly describe some of the codes and standards regarding guiding and supporting risers.
While the pipe is nothing special, gravity will make things way more interesting. Consider the riser pipe (Figure 1). The pipe runs the entire height of the building, 50 stories. If the slab-to-slab height is 10 feet, our pipe is 500 feet tall. A typical support for this pipe may be a riser clamp, maybe on every other floor. With no temperature change, the riser weight is distributed evenly between all the riser clamps.
One solution may be to move the anchor to the center of the riser (Figure 3). The anchor is a hard connection from the pipe to the structure and a point of zero movement. The riser is now divided into two sections, each 250 feet. Now the maximum pipe movement will be half of the entire riser, or 2.45 inches. The previous questions may be asked regarding 2.45 inches of movement. If they can be answered during the design stage of a project, great! On to the next project!
And what about spring supports? These are specially-designed systems of anchors, guides and supports for risers that are designed to move with the pipe. The spring supports stay in contact with the floor slab as the pipe moves. As the pipe moves, the springs stretch or compress to exert more force on the floor slab, which takes load off the main anchor in the center of the riser. These systems are effective for taking the load off the main anchor; however, this type of system has limitations. These are:
The internal pressure along a horizontal pipe axis generally varies a small amount. Once that pipe is tipped up to vertical, a fluid-filled riser builds pressure as the pipe gets taller. The pressure at the bottom can be significantly higher than at the top. This is due to the weight of the water.
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