Scansolution’s Tray and Packed Bed Column Scanning service provides a non-invasive, on-line diagnostic technique used to evaluate the internal hydraulic conditions of process columns without interrupting operation. The scan accurately identifies flooding, foaming, entrainment, tray damage, maldistribution, and packed bed collapse while the unit remains in service. This allows plant engineers to make informed operational decisions, plan maintenance effectively, and minimise unplanned shutdowns.
Scansolution supported a refinery operator located in Southeast Asia by conducting a series of gamma column scans on a Sour Water Stripper Column. The objective was to assess internal integrity and process performance without shutting down the unit.
Operational instability and concerns regarding tray flooding, entrainment, and foaming prompted the need for a non-intrusive diagnostic solution
Multiple gamma scans were performed between 2 months at different operating rates. The scans evaluated tray condition, liquid holdup, flooding behavior, and bottom liquid levels.
At higher rates, trays were intact with stable liquid holdup and no flooding. Mild entrainment was observed at selected trays. At reduced rates, flooding was detected at the top trays with severe entrainment in mid-sections, while lower trays remained intact.
The scans confirmed that flooding was process-related rather than due to mechanical failure, allowing operators to adjust operating strategies confidently.
Rescan at lower rates, conduct targeted thermal neutron scans if flooding persists, and monitor density changes at critical trays during rate adjustments.
Non-intrusive diagnostics, avoidance of unnecessary shutdowns, reduced troubleshooting time, and improved operational confidence.
This case study demonstrates how Scansolution’s gamma scanning provides actionable insights for refinery operators facing complex column performance challenges.
