How to Inspect a Packed Tower After a Major Flooding Event Before Restart

A severe flooding event can expose a packed tower to hydraulic conditions far beyond normal operation.

Liquid holdup increases dramatically, pressure drop rises, packing may move, and mist eliminators can receive an abnormal liquid load.

Once the process has been stabilized, it can be tempting to restart the tower without internal inspection.

For a major event, however, the packed system may no longer be in its original condition.

Determine How Severe the Flooding Was

Review:

• maximum differential pressure;
• duration;
• gas rate;
• liquid rate;
• whether liquid reached downstream equipment.

A short approach to flooding is different from prolonged operation with the bed fully flooded.

Inspect Lightweight Packing for Movement

Plastic random packing may lift or shift.

Look for:

• uneven bed surface;
• packing above the bed limiter;
• pieces trapped in upper internals.

If movement occurred, the cause should be corrected before restart.

Check Ceramic Packing for Breakage

Hydraulic movement can cause brittle pieces to collide.

Fragments may accumulate near the support grid.

Excess fragments reduce free area and can increase future pressure drop.

Inspect Structured Packing

Structured blocks can shift, tilt, or deform if the hydraulic force was severe.

Check layer alignment and wall fit.

Inspect the Bed Limiter

A severe upward load can damage:

• clamps;
• grids;
• attachments.

A limiter that appears roughly in place may still have loosened connections.

Check the Liquid Distributor

Flooding can fill areas not normally exposed to high liquid level.

Deposits or debris may enter distributor openings.

Large hydraulic forces can also shift poorly secured sections.

Inspect the Packing Support

During flooding, the bed carries significantly more liquid.

The support experiences higher load than in dry operation.

Check beams, grids, and attachments for deformation.

Inspect the Mist Eliminator

A severe flooding event often sends a large liquid surge upward.

Mesh pads may become saturated, compressed, or displaced.

Vane separators can experience drainage overload.

Check Downstream Equipment

Liquid carryover may transport packing fragments or solids beyond the tower.

Although outside the internal retrofit scope, downstream evidence can help establish event severity.

Identify the Root Cause

Possible causes include:

• excessive gas flow;
• excessive liquid flow;
• blocked support;
• fouling;
• outlet restriction;
• control failure.

Restarting without correcting the cause simply risks repeating the event.

Establish Restart Conditions

The tower should return to service under controlled gas and liquid rates.

Differential pressure should be monitored as loading increases.

A new clean or repaired baseline can help confirm that the bed has returned to normal hydraulic behavior.