If your Cooling Towers are run seasonally, the time to shut them down is soon approaching. Under are a couple of tips to observe that will guarantee your system stays protected all through the winter and starts up again problem-free when spring rolls round.
Preparing for Shutdown/Layup
1. Two to three days prior to the shutdown, increase the bleed-off to reduce the amount of solids in the system. Cut back the bleed-off set point to 1-1.5 cycles (1-1.5 x makeup conductivity).
2. One day previous to the shutdown, add twice the normal quantity of non-oxidizing biocide and recirculate for 4 to 6 hours. If a non-oxidizing biocide isn’t used, an oxidizing biocide can be utilized as a substitute.
1. Sweep off the distribution deck while the system is operating. Drain down the tower and wash out the tower fill and sump. Take away and clean all strainers. Reinstall the strainers.
2. Isolate the tower controllers. Take away and protect the tower conductivity probe and shut the controller off (do not unplug the controller power source).
3. Refill the tower system (it doesn’t must be refilled to the working stage so as to reduce the system volume). Vent all chillers to ensure that they are utterly full of water. Close the vents.
4. Add layup water therapy to the tower and recirculate the system for a minimal of eight hours using all pumps.
5. Utterly drain the system from the bottom point.
6. Clean and flush the chemical feed pumps. Place the suction line (foot valve) of every pump in water and function the pump to fully flush it of therapy merchandise. Depart the foot valve out of the chemical tank for the off-season.
7. Open the chiller condenser finish bells and brush the tubes. This ought to be achieved instantly to keep away from stagnant water sitting in the chiller.
8. Retailer the chiller with the tip bells removed when not in use.