Closed Loop Cooling Tower Maintenance

Closed Loop Cooling Tower Maintenance

Closed-loop cooling tower maintenance is important to keep the system efficient, extend equipment life, and prevent scaling, corrosion, or biological growth. Unlike open-loop systems, closed-loop towers circulate fluid (often water mixed with glycol) in a sealed circuit, reducing contamination but still requiring regular care.

Here’s a maintenance guide for closed-loop cooling towers:

Closed Loop Cooling Tower Maintenance Daily / Weekly Checks

Inspect water levels in the expansion tank and makeup system.

Check pump operation (flow, pressure, vibration, noise).

Verify fan operation (balance, unusual noise, bearing temperature).

Look for leaks in piping, valves, and heat exchanger connections.

Closed Loop Cooling Tower Maintenance Monthly Maintenance

Closed Loop Cooling Tower Maintenance Check water chemistry:

  Monitor pH, glycol concentration (if used), conductivity, and inhibitor levels.

  Adjust treatment to control corrosion, scaling, and biological growth.

  Inspect strainers and filters; clean or replace if clogged.

  Examine nozzles and spray distribution system (for hybrid/evaporative closed-loop towers) for blockage.

  Lubricate motor bearings if not permanently sealed.

Closed Loop Cooling Tower Maintenance Quarterly Maintenance

Clean heat exchange surfaces(coil bundles) with high-pressure water or chemical treatment if fouling is present.

Inspect fan belts, shafts, and couplings; adjust tension and alignment.

Check drift eliminators and louvers for cracks or buildup.

Test control systems (temperature sensors, level controls, VFDs).

Closed Loop Cooling Tower Maintenance Annual Maintenance

Drain and flush the system to remove sludge, scale, and deposits.

Thorough coil inspection for corrosion or tube damage.

Inspect gear reducers or direct drives: check oil levels, replace oil/grease, and examine for wear.

Check structural components (casing, basin, coil support, fan guards) for corrosion or deterioration.

Recalibrate sensors and control instruments.

Closed Loop Cooling Tower Maintenance Best Practices

Maintain proper water treatment program (corrosion inhibitors + biocides).

Use glycol solutions in colder climates to prevent freezing.

Keep records of all maintenance and water treatment data.

Schedule shutdown cleaning during off-season.

Ensure good airflow around the unit (no obstructions).

PT Company have different kinds of closed cooling tower parts, and we can do closed loop cooling tower maintenance.