EI Guidelines for Pipeline Inspection.pptx

PIPELINE

1. EI Guidelines

2. Likelihood of Failure(LOF) Form of scoring used for screening Does not deal with consequences Score depend on mainly Pipe Dia and Wall thickness Excitation mechanisms considered

3. Qualitative Assessment(TM-01) Key Information Required PIDs PFDs Knowledge of Plant operation Plant History Plant maintenance and corrosion management

4. TM-02 Main line Qualitative assessment Score of >0.5 vibration transmission check

5. TM-03 Quantitative Assessment of SBC Based on the mainline score Geometric Data and Location Isolated assessment is possible Tonal Excitation Pulsation: Flow induced excitations PDP Mechanical excitations Structural Natural Frequency

6. TM-04 Quantitative assessment of Thermowells Ignored for now

7. TM-05 & TM-06 Visual Assessment Vital Enquiry of corrective actions

8. TM-07 Vibration Measurement Techniques Threat determination Data taken for worst case

9. TM-08 Specialist Techniques Strain Measurements Pulsations Monitoring CFD and Structural Simulations

10. TM-11 Corrective Actions SBC LOF Vibration Measurement Results Depend on dominant excitation mechanism and response

11. Type of Project Existing Plant

12. Score Determination g

13. Approach Identify a vibration source

14. TM-01 Focus Safety or Business critical Quantitative assessment

15. T2 Quantitative assessment of Main Line

16. Mechanical Excitation LOF

17. Pulsations

18. T3 Quantitative Assessment of SBC Assessment of all SBC for main line score >0.3 Tonal excitation should be avoided of all types Natural Frequencies must be determined Two Stages of LOF score Geometric LOF Location LOF

19. Geometric Assessment

20. Location Assessment

21. T5 Visual Inspection Complete guidelines are available User ability Location for Measurements

22. T7 Vibration Measurements Location of Highest level of Vibrations Midspan or unsupported section of main line For SBC follow the provided figure Max value of vibration measurement for three axes should be used

23. Accelerometer and Data Processing Completer guidelines regarding Choice Location Sensitivity of accelero are provided Guidelines and Charts for FFT analysis Criterion determinations

24. T8 Special Measurements Dynamic Strain measurement based on T8-2 should be made as Time history can be converted into frequency domain to observe dynamic strains in response to frequencies Rapid Less time consuming More suitable in fatigue assessment BS7608 Fatigue curves for welds Experimental modal analysis to verify simualtions

25. T9 Special Predictive Methods Finite element analysis Modal Acoustic CFD

26. T10 & T11 Provide Corrective action for T10 Main Line T11 SBC Determined based on results of data and simulations Choices can be made from the EI guidelines

27. Summary Following steps are to taken as per EI Guidelines Qualitative assessment of Main line Qualitative assessment of SBCs Process flow and Operation scenarios LOF score determination of Interested SBC as per Appendix C Depending on LOF score design or assessment decision be made Vibration Measurements Choice of accelerometer Data logging FFT analysis Source identification Natural frequency and Mode shape determination Predicted stress level Tonal Excitations sources Dynamic Strain Measurement Fatigue decision based on BS7608 or PD5500 If critical then proceed further Experimental modal analysis if possible Corrective actions based on guidelines