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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Bellows vendors will often quote two different cycle lives for their bellows. The latter provides a significantly higher cycle life. The EJMA bellows fatigue curve is a best standarc curve based on data that was available, so it provides an expected average cycle life.
Historically, designers have put large factors of safety on the frer of design cycles for bellows, which was in part justified since there was no design margin in the EJMA fatigue curve. This would result in a margin stansard safety entirely dependent upon the designer, and could vary from large, to none. When using this curve, it should be recognized that appropriate design margins are already included, and they should not also be included in the specified number of cycles.
With bellows, design for an excessive number of cycles can unnecessarily compromise other design aspects, such as design with respect to internal pressure and column stability resistance to squirm.
There is ongoing work to potentially revise the EJMA fatigue curve to include a factor of safety, which may be variable. This would be a very good development as stzndard will lead to more uniform design practices and less confusion.
Click to Request Info. He has more than 30 years of experience in design, design review, analysis, check-out, mechanical integrity, development, troubleshooting, and failure analysis.
He is an ASME Fellow and has more than 60 publications and five patents and is a frequent speaker and chairman in technical forums. He is President of Becht Engineering Co. They seemed too high. Why was the EJMA stresses higher?
The Difference Between ASME B31.3 Appendix X and EJMA Fatigue Curves for Bellows?
Was he fudging the first time? Sa is the allowable stress from the applicable code. Perhaps there was confusion over which code was applicable.
And the allowale stresses can be different which different codes. The design would be EJMA. The Sa he gave me, for 70F and F were and respectfully. Can this be true? Ejma uses Sym yield strength at room from cert not tensile.
AND it does not explain why his allowables don’t jive.
Metal Expansion Joint Engineering
Per Ejma I need the allowable at design to check the calculated stresses. Hi, I have a question about the examination in Appendix The minimum control requirement of the bellow tube has to be X-ray or DPI prior to forming.
Is this a standard requirement for all types of application of expansion joints, or can this be a demand of a customer. I cannot imagine that for simple applications the bellow tube Always has to be x-rayed or DPI tested.
EJMA does not mention this. Available Ejja Apply On-line. Key Contacts Becht Info Request. Subscribe to this blog post Unsubscribe. Friday, 26 July ejam What is Bellows Pressure Thrust? Tom Vowell on Wednesday, 16 October Chuck Becht on Wednesday, 16 October Response to Stress Question.
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EJMA 10th Edition | Triad Bellows
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