Ensuring long term safe operations

From left to right:  Animation of measured vibrations on RC structure before and after reactor installed with vortex flow mitigation device in cyclone | Cracks on primary beam at top of RC structure

From left to right: Animation of measured vibrations on RC structure before and after reactor installed with vortex flow mitigation device in cyclone | Cracks on primary beam at top of RC structure

The Institute was a key member of a highly qualified technical team that undertook comprehensive investigation of vibrations in a 150m height RC structure supporting a polymerisation rector in a petrochemical plant. Cracks had been observed in the primary beams of the structure, as well as on the support locations where the rector was secured.

Results of vibration monitoring undertaken over extended period were correlated with process activities to identify incidents of extreme vibrations. Comprehensive measurements were undertaken on the entire RC structure, rector body, gas pipes and cyclones upon which a large scale Operational Deflection Shape (ODS) analysis was undertaken. The vibration analysis was complemented with finite element analysis from upon which cracks propagation locations and stresses were determined.

Root causes were identified by UTM upon which remedial measures were implemented. Damaged state structural integrity and fatigue life were deter‐ mined upon which decisions were made on the long term operability of the plant.

“We are making billion dollars decision on this”.

Dr Goh Kok Tong
Petronas Group Technology
Now, Principal Integrity Engineer Wood Group Integrity, Australia

From left to right: Comparison of actual cracks (measured) and predicted critical locations from Finite Element Analysis | Actual cracks at supports of rector as per critical observed and predicted and actual measured locations.

From left to right: Comparison of actual cracks (measured) and predicted critical locations from Finite Element Analysis | Actual cracks at supports of rector as per critical observed and predicted and actual measured locations.