April 2004

Piping/Reliability

An effective method for analyzing piping vibration problems

The matching mode shape technique combines field vibration data with natural frequency information

Saha, S., Rastogi, R., Reliance Refinery; Bhattachrya, A., Bechtel India Pvt Ltd.

Piping vibration in an operational plant is a common problem. These vibrations are typically characterized by low amplitude levels and a large number of cycles over the lifetime of plant operations. This large number of stress reversals can lead to fatigue failure in piping components, jeopardizing safe and reliable plant operation. The major sources of excitation mechanisms are: Flow-induced turbulence Two-phase (slug) flow Pulsation ? reciprocating machinery, rotating stall, periodic flow-induced excitations Fluid transients ? water hammer, relief valve discharge High-frequency acoustic emission (HFAE) Mechanical ? rota

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