Stationary Time Monitoring Study provides continuous, real-time evaluation of column performance using multiple detectors placed at specific elevations. This non-intrusive technique monitors density changes, foaming rates, flooding points, and hydraulic behaviour over a defined period. By analysing these variations, plant engineers can fine-tune tower operations, optimise process parameters, and prevent potential upsets — all while the unit remains in service.
Advanced multiple-detector gamma-ray monitoring at fixed elevations to track density changes, foaming and flood points in fractionator columns, tray towers, packed beds and process piping while your unit stays on stream.
Continuously observe column hydraulics over time and gain real-time visibility of flood onset, maldistribution and internal integrity to support predictive maintenance and process optimisation.
Stationary Time Monitoring is a specialised gamma-ray scanning method where the source and detectors remain fixed at one elevation while density changes are recorded over time. A collimated gamma-ray source is placed on one side of the vessel and a vertical array of detectors on the opposite side, each measuring transmitted radiation at one-second intervals for several minutes.
The technique is ideal for:
By monitoring under different operating conditions, operators see how the column responds to load changes, feed swings and start-up/shutdown transitions.
A collimated gamma source and multiple detectors are aligned across the vessel. Each detector corresponds to a specific scanline or radial position, and radiation intensity is recorded every second over a defined period (typically 5 – 7 minutes).
Stable hydraulics produce flat, consistent detector profiles. Changes in foam height, liquid level and vapour liquid mixing appear as clear trends and fluctuations in the detector count curves, allowing early identification of flooding or maldistribution.
No insulation removal, tray lifting or vessel opening is required. The study is performed under normal operating conditions and can be executed in alignment with ISO 23159 Gamma Ray Scanning Method on Process Columns and applicable radiation regulations.
| For towers and columns | For process optimisation |
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| Operational & hydraulic insight | Business & reliability gains |
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Scansolution turns complex tower hydraulics into clear, actionable information. Our Stationary Time Monitoring Study provides the visibility needed to operate safely and efficiently, validate revamps and support long-term reliability strategies.
| Stationary gamma-ray monitoring | Fractionator diagnostics |
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| Hydraulic performance mapping | Predictive maintenance support |
No. A vertical gamma scan gives a full-height density profile at one point in time. Stationary Time Monitoring tracks density changes over time at one elevation. Combined, they provide a much deeper understanding of column hydraulics and mechanical condition.
Each elevation is typically monitored for 5-7 minutes at one-second intervals. Multiple scanlines can be acquired in a single shift without impacting unit operation.
Yes. Scansolution conducts all work under strict radiation safety procedures and national licensing requirements, using controlled, collimated sources and trained personnel to minimise exposure to plant staff.
Many operators repeat Stationary Time Monitoring on critical towers every 6—12 months to build trends, validate the impact of maintenance and support reliability-centred maintenance planning.
If you operate critical fractionators, absorbers or packed towers and want deeper visibility into their hydraulic behaviour, Scansolution can design a Stationary Time Monitoring programme tailored to your process, turnaround schedule and performance objectives.