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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Some common tests include the following:. Safety 10 post s.
The Guide is intended to provide users with a basic understanding of expansion joints. Was he fudging the first time? What is Bellows Pressure Thrust? Significant Changes in the Tenth Edition: And the allowale stresses can be different which different codes. The Sa he gave ztandard, for 70F and F were and respectfully. Litigation Support 3 post s. They seemed too high.
EJMA does not mention this.
This standarf result in a margin of safety entirely dependent upon the designer, and could vary from large, to none. Utilizing this program, we can easily perform all of the analyses noted above utilizing over 35 different materials including:. A new approach was developed for the design of reinforced bellows, resulting in a modified set of equations for some stress components and for the spring rates.
He is President of Eejma Engineering Co.
EJMA 10th Edition | Triad Bellows
This includes standard conversions in addition to constants used in calculations. AND it does not explain why his allowables don’t jive. The latter provides a significantly higher cycle life. Materials Degradation and Corrosion 16 post s.
Per Ejma I need the allowable at design to check the calculated stresses. Fatigue life calculations were greatly enhanced and simplified. We have the technical expertise to assist customers for the most common applications and the tools in place to aid with selection.
Metal Expansion Joint Engineering
Project 2 post s. Machinery 19 post s. Bellows vendors will often quote two different cycle lives for their bellows. A new E-book version of the new 10th Edition Standards can be downloaded to your PC, laptop or tablet. Guest – Tom Vowell on Sunday, 20 October 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.
Guest – Alexander on Monday, 25 August Heavy Lift 14 post s. General Interest 4 post s. This would be a very good development as it will lead to more uniform design practices and less confusion. Key Contacts Becht Info Request.
The Difference Between ASME B31.3 Appendix X and EJMA Fatigue Curves for Bellows?
With bellows, design for an excessive number of cycles can unnecessarily compromise ejmz design aspects, such as design with respect to internal pressure and column stability resistance to squirm.
The calculation of universal type Expansion Joints has been simplified by a modified equation for the axial movement per convolution.
Definitions in the Nomenclature section 1. Response to Stress Question. This Guide is not intended as a source for expansion joint design or application details. Fitness for Service 9 post s.
Bellows pitch and height tolerances were redefined relative to diameter. Click to Request Info.