![]() The nuclear energy industry has found works on flow induced vibration very useful and some countries have developed different allowable vibration criteria to prevent failure 2, 6, 7. Early theoretical works were based on the bending vibration of a beam on simple supports 3, 4, 5. Therefore, it is important to understand vibration in the case of internal flow in pipes.Įarly work on flow induced vibrations dates back to the 1940s when above-ground oil pipelines operated by Trans-Arabian Pipeline Company were observed to have a complex vibration characteristic due to internal fluid flow especially when perturbed by external cross winds 3, 4. The vibration level, if unchecked, can adversely affect the life span of a piping system 1, 2, and it can consequently affect the operational capacity and life span of the plant which it is a part of. Severe or unusual high vibration of piping systems could be a sign of imminent failure of pipe, imminent failure of devices such as strainers, valves, pumps, etc., or due to a loose and semi-heavy machine part or tool in the pipeline. (vi) Weak foundation and support structures The source(s) of vibrations of a piping system could be any or a combination of the following: It is common to use the vibration of piping systems as a quick check that a plant is operational by listening for the humming sound or by placing a hand on a pipe for the vibration feel. Vibration of exposed pipe sections or systems due to external and/or internal fluid flow has been a common place in industrial plants and pipelines. ![]()
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