Pipe vibration measurements
Industrial piping networks are subject to a wide range of dynamic stresses: mechanical excitations from machinery, pressure pulsations, flow turbulence or structural interactions. These phenomena can generate significant levels of vibration and induce cyclic stresses that can lead to cracking, weld failure or premature degradation of supports.
Controlling piping vibrations is a key factor in mechanical reliability, continuity of operation and industrial safety.
Technical and industrial challenges
Excessive vibrations in networks can have various origins: pulsating phenomena, excitation by rotating machines, flow instabilities or coincidences with the system’s natural frequencies. If left unidentified and untreated, these vibrations can lead to :
- line fatigue failures
- localized breaks on spurs or changes of direction
- accelerated degradation of substrates
- unplanned downtime and high maintenance costs
These problems concern both new installations and existing networks, particularly in the energy, petrochemical, chemical and continuous industrial process sectors.
Scope of intervention and global approach
SIM Engineering measures, analyzes and treats piping vibrations, whether for exploratory purposes, as a diagnostic tool following the discovery of a problem, or to validate conformity.
The approach is based on a structured methodology combining field measurements, normative analysis and identification of the physical mechanisms responsible for vibration stresses.
Exploratory vibration measurements
The first step is to objectively characterize the vibration level of the network concerned. On-site measurements are carried out using accelerometers positioned at identified critical points: elbows, tappings, closed bottoms, support zones or elements showing visible damage.
Acquisitions are made in all three directions (X, Y, Z) to reproduce the complete dynamic response of the pipe.
Fourier transform frequency analysis (FFT) identifies dominant frequencies and links observed vibration levels to potential sources of excitation. This phase provides an essential factual basis for orienting the diagnosis.
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Normative assessment and technical diagnosis
The vibration levels measured are then assessed against industry-recognized standards. Criticality analysis can be based on :
- ISO 20816-8
- EFRC or SwRI recommendations
- VDI 3842
This assessment enables us to objectively qualify the level of risk and prioritize critical areas.
Where necessary, further investigations are carried out, notably as part of AIV (Acoustic Induced Vibration) or FIV (Flow Induced Vibration) studies. These analyses aim to identify whether vibrations are linked to internal acoustic phenomena, flow turbulence or fluid instabilities.
Precise identification of the mechanisms involved is a crucial step. Phenomena may include :
- structural resonances
- pulsating excitations
- turbulence or vortex
- mechanical interactions with neighboring equipment
By understanding these mechanisms, we can avoid inappropriate corrective action and pinpoint the source of the problem.
Stress analysis and fatigue risk assessment
In addition to vibration levels, the study can include an assessment of dynamic stresses and the risk of mechanical fatigue. This approach makes it possible to estimate the residual strength of the network, and to determine the critical or non-critical nature of the stresses observed.
The analysis cross-references measured amplitudes, identified frequencies and the mechanical characteristics of the lines to objectify the actual level of criticality.Proposals for corrective solutions
Following the diagnosis, SIM Engineering makes technical recommendations adapted to the identified phenomenon. Solutions may include :
- adding or repositioning supports
- modification or reinforcement of existing structures
- support optimization
- adjustment of network pulse response
- local configuration adaptations
The aim is to sustainably reduce vibration amplitudes, limit cyclic stresses and prevent the recurrence of disorders.
Recommendations are prioritized according to the level of criticality and operating constraints, to ensure that implementation is compatible with industrial imperatives.
- adding or repositioning supports
An engineering approach focused on reliability and performance
Measuring and diagnosing pipe vibration is more than just noting a high vibration level. They aim to understand the underlying physical mechanisms and provide a targeted, sustainable technical response.
By combining field instrumentation, frequency analysis, normative assessment and expertise in vibration engineering, SIM Engineering supports its customers in securing their piping networks.
This approach makes it possible to prevent breakage, optimize the mechanical reliability of installations and make vibration management part of a controlled, sustainable industrial approach.
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