Vibration and Pulsation Check

BETA has over 45 years expertise in conducting vibration assessments, including vibration acceptance tests.

Our experience includes machinery such as:

  • reciprocating compressors and pumps
  • foundations or offshore platforms
  • centrifugal or screw compressor problems
  • transient events in a gas or liquid piping system
  • flow-induced pulsation-vibration issues in piping systems
  • paper machines
  • engines, turbines, and other machines.

Our field engineers have a thorough understanding of dynamic analysis, resonance (causes and mitigation), mechanical design, torsional stress analysis, pulsation measurements and avoidance, impact testing, modal analysis, ODS, performance issues, and multi-channel instrumentation.

Contact us to discuss your application and for advice on vibration analysis

BETA advantages include:

  • Audited safety program meets global standards. This focus on safety is a significant advantage and benefit to our customers.
  • Expert staff with unique skills.
  • Global support, with offices in the USA, Canada, Asia and regular coverage in other areas.
  • Specialized software analysis tools provide fast and comprehensive results.
  • Equipment calibration and testing. Most competitors lack the resources for calibration of pulsation and vibration instrumentation.

Scope

The following tasks may be required, depending on your application:

  • Vibration on machines and piping systems: record vibration throughout the compressor/piping system using spectral analysis. Evaluate vibrations at run speed, harmonic and at non-synchronous frequencies. Identify locations where vibration exceeds the industry guideline.
  • Vibration on turbomachinery: record shaft relative motion and, or casing vibration throughout a speed range and analyze using spectra, bode plots, shaft centerline plots and envelope analysis to understand rotordynamic and bearing issues.
  • Speed sweep: for variable speed applications (motor or engine driven), check vibration amplitudes at all operating speeds. It is common to find severe vibration at a specific speed because of resonant conditions.
  • Pulsation Assessment: measure pressure pulsations and identify locations where acoustical forces may be above guideline.
  • Impact (Bump) Tests: measure Mechanical Natural Frequencies (MNFs) of vessels, cylinders, frame and other components of the system. Identify where resonance conditions will occur.
  • Operating Deflection Shape (ODS): measure relative vibration across machine system. This technique is useful to identify root cause of problem.
  • Foundation, Skid Check: inspect grout condition, relative vibration at different points on foundation, degradation, gravel/pile contact, and other factors affecting foundation integrity. Assess stiffness and resonance in skid and supporting structures. 
  • Small diameter piping (small bore): identify locations where instrumentation and other small bore piping is resonant.
    > Small Bore Piping
  • Performance Review: computer simulation of system to verify power and throughput meet specifications
  • System Integrity: inspect clamps, bracing, bolts, flange alignment, wedge supports and other components
 

Field testing to resolve pulsation and vibratin problems Field testing multiple units
Field testing to resolve pulsation and vibration problems


  • Analyze and reporting: provide a comprehensive checklist of problem areas and results.
  • Identify root cause of vibration problems to avoid "band aid" solutions that often do not resolve the problem.
  • Quick Improvements: fix problems on site if possible
  • Other Options:
    • Torsional vibration review
    • Audible noise levels
    • Alignment check

Application

A field visit to conduct a vibration assessment is recommended for:

  • Start-up check: identifies areas where vibration exceeds guideline and establishes a baseline for future vibration measurements.
  • Vibration problems or failures: cracked nozzles, piping, or other events are often due to vibration or pulsation related problems.
  • Process or operating conditions change. A vibration problem often develops when a compressor’s operating condition changes. For example, the unit should be checked if flow, speed, temperature, or suction/discharge pressure change to a new condition.

Benefits to Owner

  • Baseline assessment of equipment condition - to establish operating and performance conditions
  • Independent review by machinery experts
  • Practical recommendations to minimize maintenance and capital costs
  • Planning and support for prioritizing turnaround activities
 

Resonance Problem 

 Resonance Problem - fixed with simple on-site solution

 

 Spectrum Analysis chart

 Spectrum Analysis - identifies resonances causing vibration

 

 correct bracing scheme

 BETA Specialists identified the correct bracing scheme to resolve cylinder vibration 

Reciprocating and rotating machinery analysisPaper mill vibration analysis Multi-channel vibration analysis
Experts in reciprocating and rotating machinery analysis

Vibration problem solving at large paper mill

 

Multi-channel vibration analysis of skid and foundation