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I need EJMA Standard 10th Edition? Can anyone share? Petroleum Community Forum -Free Discussion and Education Community. Help. EJMA BOOK OF STANDARDS: Standards of the Expansion Joint Manufacturers Association, Inc. – Includes one copy of Practical Guide to Expansion Joints. The EJMA Standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type.

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Perhaps there was confusion over which code was applicable. Bellows pitch and height tolerances were redefined relative to diameter. In addition to utilizing this lab to further our own knowledge of expansion joints, it can be utilized for customer specific expansion joint testing.

Hi, I have ej,a question about the examination in Appendix Testing A large contributor to the knowledge base at American BOA has been the capability to perform in-house testing in our state of the art on-site test lab. Subscribe to our blog Unsubscribe from our blog. General Interest 4 post s. The EJMA bellows fatigue curve is a best fit curve based on data that was available, so it provides an expected average cycle life.

Why was the EJMA stresses higher? Subscribe to this blog post Please fill in your email address to subscribe to updates from this post.

Expansion Joint Manufacturers Association

AND standarc does not explain why his allowables don’t jive. Process Consulting 10 post s. There is ongoing work to potentially revise the EJMA fatigue curve to include a factor of safety, which may be variable. Was he fudging the first time? Materials Degradation and Corrosion 16 post s.


Significant Changes in the Tenth Edition: Litigation Support 3 post s. EJMA does not mention this.

The software utilized for eja modeling and FEA work in conjunction with each other to allow the shortest possible time from concept model to production drawing generation. Per Ejma I need the allowable at design to check the calculated stresses. When using this curve, it should be recognized that appropriate design margins are already included, and they should not also be included stanrard the specified number of cycles.

The Guide is intended to provide users with a basic understanding of expansion joints.

To order click here. Becht Nuclear 36 post s. A new E-book version of the new 10th Edition Standards can be downloaded to your PC, laptop or tablet. Single Bellows Axial Vibration Constants were revised.

Ejma uses Sym yield strength at room from cert not tensile. Tom Vowell on Wednesday, 16 October Guest – Tom Vowell on Sunday, 20 October Expansion Joint Engineering Innovation.

Becht Software 4 post s. In addition to performing analysis on bellows elements, American BOA’s Engineering Staff routinely performs calculations on the load restraining hardware normally associated with expansion joints. If a bellows can be manufactured from the material, we can easily add it to the database to perform your analysis. Fitness for Service 9 post s. He is President of Becht Engineering Co.

Historically, designers have put large factors of safety on the number of design cycles for bellows, which was in part justified since there was no design margin in the EJMA fatigue curve. The distinction of thin versus thick bellows has been added. Machinery 19 post s. The minimum control requirement of the bellow tube has to be X-ray or DPI prior to forming. However, if you require an alloy that is currently not in our database, we will examine the alloy to determine it’s welding and ductility properties.


Chuck Becht on Wednesday, 16 October Guest – Alexander on Monday, 25 August Expansion Joint Design The heart of the expansion joint is the bellows element itself. Pressure Vessels 18 post s. American BOA uses a combination of 3D modeling software along with finite element analysis FEA to determine the correct hardware for your design conditions.

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.

Expansion Joint Manufacturers Association – Wikipedia

Key Contacts Becht Info Ekma. We have the technical expertise to assist customers for the most common applications and the tools in place to aid with selection. Click to Request Info. And the allowale stresses can be different which different codes. Fatigue life calculations were greatly enhanced and simplified.

He is an ASME Fellow and has more than 60 publications and five patents and is a frequent speaker and chairman in technical forums. Available Positions Apply On-line.