Maintenance and Operation Instructions for Closed Cooling Towers

Maintenance and Operation Instructions for Closed Cooling Towers

1、 Safety precautions for operators

（1） Adequate air intake clearance;

（2） Safety of the mechanical drive system;

（3） Potential access problems caused by obstacles around the tower;

（4） Guardrails required on the top of the tower;

（5） Protective guards required around the tower;

（6） Keeping maintenance personnel out of potential danger;

2、 Preparation for operation

（1） Confirm that the closed cooling tower is in position and securely connected and fixed.

（2） Confirm that all piping is connected and properly sealed.

（3） Confirm that the electrical wiring is correct and that the fan and the water pump rotate in the right direction.

（4） Confirm that all valves in service on the circulating water line are open.

（5） Remove all debris from the closed cooling tower, paying particular attention to the basin, the air inlet louvers and the water distribution system.

（6） Fill the basin with water.

3、 Periodic cleaning of the cooling tower

Operators of evaporative closed cooling towers must carry out a maintenance program that keeps bacterial contamination to a minimum. Inspect the tower at least once a week during the operating season, and flush it once before and once after each season, using a high-pressure water gun to wash the air inlet louvers, drift eliminator, basin, coil surfaces and casing surfaces. Blow down the basin regularly. A closed cooling tower cools hot water by continuously evaporating part of the water. Although the loss is made up by the makeup water system, the water evaporates in the form of pure water, so the concentration of dissolved solids in the remaining water increases, and so does the concentration of contaminants if nothing is done to control it. To keep water quality within the requirements of a closed cooling tower, operators should begin by holding a relatively stable number of cycles of concentration. Stabilizing that figure is normally achieved by blowdown, which discharges a fixed volume of water as wastewater.