Replacement of activated carbon filter under high surveillance at the navy base, Toulon

During the lockdown, PHOSPHORIS and its partners, replaced the carbon filter of the carbon tank at the navy training center of Toulon (CFPES). This operation enabled sailors to work in the best conditions when the lockdown measure are lifted. The mission lasted several days and included long and thorny manipulations.

A high level of surveillance is present at each stage of the process, and special precautions are taken to handle the dusty and dangerous filters. The following table details the process:

replacement-activated-carbon

1. Tank ventilation activation

First of all, MP Filter put the tank under ventilation : The ventilation zone is marked out and the extraction system is connected to one of the two manholes. Stale air can be filtered and evacuated.

A 400 volt fan with filter box is connected to the second manhole, with a ventilation time of 48 hours before the carbon is emptied.

 

2. Emptying carbon by specific truck

MP Filter marked out the area and sat up a pumper truck in front of the 15-mcarbon tank. The suction of the pumper truck is carried out by a water/carbon mixture.

An operator entered the tank, under the continuous supervision of a third person. He :

  • Checked the air quality in the carbon tank
  • Used an air-supplied mask
  • Worn an individual four gas detector (hydrogen sulfide – carbon dioxide – carbon monoxide – lower explosive limit)
  • Handled used activated carbon
  • Extracted activated carbon residues

The waste was then traced and transported to a treatment centre with the greatest attention paid to the non-propagation of dust during transport.

The operation was spread over three days.

vidange-charbon

3. Supply and unloading of activated carbon

dechargement-charbon

After clearing out the tank, new activated carbon has been delivered following a very strict safety protocol.

  • Activated carbon: 22 pallets of 500 kg, packed in 25-kg bags
  • Unloading with a lift truck
  • Storing in front of the premise.

4. Tank checking

MP Filter carried out an internal inspection of the condition of the tank by sending, an operator inside. A third person was watching the operator to monitor the inspection. Technicians must :

  • Use of a air-supplied mask
  • Wear a four-gas individual detector (hydrogen sulfide – carbon dioxide – carbon monoxide – lower explosive limit)
  • Report on the condition of the components of the interior of the tank.

 

5. Handling, filling and spreading  activated carbon tank

This 2-day stage begins with the installation of a quardrail at the level of the first manhole. The operator must wear a compulsory safety harness and high anchorage point. The quardraik was stripped down to allow new carbon bags handling and materials around the tank was protected with polyane film.

MP Filter then filled in the new activated carbon:

  • Moving pallets as close as possible to the carbon tank
  • Mechanical elevation of the bags to the height of the platform
  • Filling control
remplissage-cuve-charbon

Finally, we end up spreading the carbon with an operator in the carbon tank, always under the supervision of a third person:

  • Checked the air quality in the carbon tank
  • Used an air-supplied mask
  • Worn an individual four gas detector (hydrogen sulfide – carbon dioxide – carbon monoxide – lower explosive limit)
  • Regular spreading of new activated carbon
  • AERAUTEC carbon compaction

 

6. Installation verification

To finalize this mission, the MP Filter teams will carry out tests and verification of proper operation as well as the restarting of the installation, and the commissioning of the fire alarm in the carbon tank room.