Rubber Bellows vs Metal Bellows Expansion Joints 4

Rubber Bellows vs Metal Bellows Expansion Joints 4

First and foremost, it is essential to recognize that a tank possesses distinct characteristics compared to a typical vessel. For instance, the nozzle located at the bottom of the tank is inclined to rotate downwards. This downward rotation occurs due to the shell's outward deflection when the tank reaches its full capacity. Consequently, as indicated by Pennpip's comments, anchoring such a nozzle is not advisable. If it is feasible to avoid the implementation of an expansion joint altogether, that is the optimal choice. However, if all alternative options have been explored, here is a suggested approach: The selection of your expansion joint should be conducted in conjunction with the design of your pipe support system to effectively manage the forces on both the pump and the tank nozzle, as they should work synergistically. It is crucial to obtain the mechanical properties (axial, lateral, rotational, and torsional stiffness) of the joint you plan to use or a similar one. This will enable you to accurately discern the actual loads that the pump nozzle will experience. Your pipe supports will play a key role in safeguarding the expansion joint from unwarranted deflections. Placing the joint close to the pump's suction nozzle simplifies the task of resolving nozzle loading since you're not contending with friction from supports located upstream of the nozzle (in cases where the joint is situated elsewhere). Given that the pressure is relatively low, you are unlikely to face significant pressure thrust issues, but it is imperative to comprehend its dynamics, both in your current setup as well as in future considerations. I would advise against using an expansion joint solely as a response to vibration unless it stems from prior concerns or a modal analysis. To ensure optimal operation, the pump should rest on a solid foundation, with a well-structured base plate or frame, and should be properly balanced. Moreover, the piping must be aligned accurately before final assembly, among other preparations. Expansion loops are generally to be avoided in pump suction lines. You have mentioned that there are some straight lengths available; thoroughly review your design and determine if it's possible to address this issue with only one expansion joint. If your flow rates remain sufficiently low, remember that an 18" expansion joint would generally be more cost-effective than a 30" one. As I suggested earlier, allow the supports to assist the expansion joint in alleviating the issue, but only after you've considered every other option. Conor Walshe Bellows Manufacturing and Research, Inc.

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