2 0 obj Metal Bellows Design Guide - Thomasnet If you look closer, you will see us. Limit rods are similar, however they accommodate a specified axial capability. The nominal outside diameter (inches) of convolutions is inversely related to spring rate (an increase in outside diameter will reduce the spring rate) and the design tolerance is used to vary the spring rate. Some pipe stress programs only offer "point", or zero-length expansion joint models. `R9P<=BM$he|ePAXbM%=3).%[waOB&zh|QOP9fns` $% endstream endobj 119 0 obj <>stream Salzmann spring rate shape factor Specific Spring Rate . 0000005791 00000 n Pressure (P) in pounds per square inch required to compress the bellows any distance within its maximum deflection equals spring rate (R) multiplied by the deflection (D) and divided by the effective area (A): P= RD/A. Get Started! Select a bellows from the Stock Bellows Data List or complete the Bellows Specification Form. Thefollowing definitions are provided to assist in part selection and customization to meet engineering design requirements and objectives. (Ai) Internal Effective Area (square inches) Flow liners are installed in the inlet bore of the expansion joint to protect the bellows from erosion damage due to an abrasive media or resonant vibration due to turbulent flow or velocities which exceed: Expansion joints that are installed within ten pipe diameters downstream of elbows, tees, valves or cyclonic devices should be considered to be subject to flow turbulence. This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Facilities Threaded flanges may be added to the threaded end compensators if a flanged connection is preferred. The neck of a bellows is located on both ends of the convolutions and is used to attach mating parts. The effective area is the calculated area in square inches of the effective diameter, which lies approximately halfway between the inside and outside diameter of convolutions. The used formulas are based on statistics which were determined by testing of various shapes. But, when the strength is obtained by using a stack of separate, individually flexing thin leaf elements, the spring rate is well within desired limits. Understanding the design features to get the most effective solution.
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