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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Materials Degradation and Corrosion 16 post s. The calculation of universal type Expansion Joints has been simplified by a modified equation for the axial movement per convolution. Subscribe to this blog post Unsubscribe. Was he fudging the first time? Subscribe to our blog Unsubscribe from our blog.

We have the technical expertise to assist customers for the most common applications and the tools in place to aid with selection.

He has more fre 30 years rjma experience in design, design review, analysis, check-out, mechanical integrity, development, troubleshooting, standafd failure analysis. Per Ejma I need the allowable at design to check the calculated stresses. In addition to utilizing this lab to further our own knowledge of expansion joints, it can be utilized for customer specific expansion joint testing.

Significant Changes in the Tenth Edition: The design would be EJMA.

Tightness of bellows, bands, and rings due to dissimilar material growth rates is considered. Piping 29 post s. Single Bellows Axial Vibration Constants were revised. EJMA does not mention this.


Bellows pitch and height tolerances were redefined relative to diameter. Definitions in the Nomenclature section 1. What is Bellows Pressure Thrust? 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. Reliability Improvement 29 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.

He is an ASME Fellow and has more than 60 publications and five patents and is a frequent speaker and chairman in technical forums. Perhaps there was confusion over which code was applicable. Why was the EJMA stresses higher? By utilizing pipe stress analysis software, American BOA is able to model piping systems to ensure that the expansion joints selected for your system do not result in detrimental loading on vessel nozzles or rotating equipment.

Available Positions Apply On-line. The latter provides a significantly higher cycle life. Bellows vendors will often quote two different cycle lives for their bellows.

Ejma standard free download – Google Docs

This ensures your customized solution is not only fail safe but produced in a time frame that was previously not possible. Heavy Lift 14 post s. Subscribe to this blog post Please fill in your email address to subscribe to updates from this post.

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.


Due Diligence 6 post s. I cannot imagine that for simple applications the bellow tube Always has to be x-rayed or DPI tested. Hi, I have a question about the examination in Appendix Ejma uses Sym yield strength at room from cert not tensile.

Guest – Tom Vowell on Sunday, stanvard October Expansion Joint Design The heart of the expansion joint is the bellows element itself. Fitness for Service 9 post s. Is this a standard requirement for all types of application of expansion joints, or can this be a demand of a customer. He is President of Becht Engineering Co.

Click to Request Info. To order click here. With bellows, design for an excessive number of cycles can unnecessarily compromise other design aspects, such as stanfard with respect to internal pressure and column stability resistance to squirm.

Expansion Joint Manufacturers Association

There is ongoing work to potentially revise the EJMA fatigue curve to include a factor of safety, which may be variable. Systems 2 post s.

Testing A large contributor to the knowledge base at American BOA has been the capability to stajdard in-house testing in our state of the art on-site test lab. Key Contacts Becht Info Request. The main and most important result was that the calculated bending stress due to deflection could be considerably reduced.