Equipment type:

Cooling system on EAF / Q-ONE.

Reported issue/Problem:

Dirt and sediment build-ups throughout the Q-ONE’s cooling system.

Requirement:

De-scale and de-grease the Q-ONE’s cooling system.

Note by Client:
Focus on critical points firstly. Cleaning must be completed and system tested and put back into fully operational mode, within the 15 days of winter overhaul break.

Action taken:

• A continuous 4-day CIP process on 4x 3-phase DRM cooling systems.
• Double two-way flushing before and after chemical circulation due to heavy sedimentation, greasiness and aggregate sludge.
• With continuous pH-level monitoring, the time from adding the chemicals to the strong discoloration could be observed, confirming the chemical reaction to scale and sediment build-ups, fast and effectively.
• Note:
  Fully environmentally supportive de-scaling and de-greasing liquids, and own pumping systems, for obtaining maximum cleaning capacity, were used.

Results and recommendations:

Efficient and thorough cleaning of all build-ups and sediments, and quick, considering the size of the underlying system.

The client was advised that the procedure carried out is to be strongly considered repeating within 6 to 8 months, depending on the behavior of system parameters like cooling pressure, temperatures and flow capacity, as a part of regular preventive maintenance.