Should You Replace Drift Eliminators When Replacing Cooling Tower Fill?

When planning a cooling tower retrofit, one of the most common questions engineers ask is whether replacing the Cooling Tower Fill is enough, or whether Drift Eliminators should also be replaced at the same time.

Many facilities focus only on the fill because it is the main heat transfer component inside the tower. However, experienced maintenance teams know that a cooling tower is a complete system. Every internal component affects overall performance, including airflow, water distribution, evaporation efficiency, and water loss control.

Replacing Cooling Tower Media while keeping old or damaged Drift Eliminators may reduce the expected benefits of the retrofit. In some cases, it can even create new operating problems.

The Relationship Between Cooling Tower Fill and Drift Eliminators

Cooling Tower Fill and Drift Eliminators perform completely different functions, but they work together inside the same cooling tower system.

Cooling Tower Fill Function

The main purpose of Cooling Tower Fill is to increase the contact area between air and water. It allows water to spread into a thin layer while air passes through the fill structure, improving heat transfer through evaporation.

Modern Film Fill Cooling Tower designs use specially formed corrugated sheets to create a large heat transfer surface while maintaining efficient airflow.

Drift Eliminator Function

Drift Eliminators are designed to reduce water droplets leaving the cooling tower with the exhaust air.

They work by changing the direction of airflow several times, causing larger water droplets to return into the tower instead of escaping into the environment.

A damaged Drift Eliminator can increase water loss, chemical consumption, and environmental concerns.

Why Many Retrofit Projects Replace Both Components

During a cooling tower retrofit, the internal components are often replaced after many years of operation. If the Cooling Tower Fill has reached the end of its service life, other plastic components may also have experienced aging.

Common Problems With Old Drift Eliminators

• Cracked plastic blades
• Broken sections caused by UV exposure
• Loss of structural strength
• Mineral deposits blocking airflow passages
• Higher drift loss than original design

Installing new Cooling Tower Fill while leaving severely aged Drift Eliminators may prevent the tower from achieving its original efficiency.

Signs Your Drift Eliminators May Need Replacement

1. Increased Water Consumption

One of the first signs of poor drift control is unexpected water loss.

If makeup water requirements increase without changes in operating conditions, damaged Drift Eliminators may be part of the reason.

2. Visible Water Droplets Leaving the Tower

During normal operation, some moisture will always exist in the exhaust air. However, excessive visible droplets indicate that the drift control system may not be working correctly.

3. Physical Damage During Inspection

During a Cooling Tower Fill replacement project, technicians usually have better access to internal areas. This is the ideal time to inspect Drift Eliminators carefully.

Different Cooling Tower Types and Drift Control

Counterflow Cooling Towers

Counterflow towers rely on upward airflow moving through the fill section and leaving through the top of the tower.

Because airflow velocity can be relatively high, efficient drift control is especially important.

When replacingCounterflow Film Fill,engineers should always inspect the condition of the existing drift control system.

Crossflow Cooling Towers

Crossflow towers introduce air horizontally through the fill pack. The relationship between airflow direction and drift eliminator design is critical for reducing water carryover.

During replacement projects involvingCrossflow Film Fill,checking Drift Eliminators can help ensure the upgraded tower performs as expected.

Can Old Drift Eliminators Reduce Cooling Tower Efficiency?

Although Drift Eliminators are not directly responsible for heat transfer, damaged units can indirectly affect cooling tower performance.

Possible effects include:

• Increased water loss
• Higher chemical treatment costs
• More frequent maintenance
• Airflow disturbance
• Reduced environmental compliance

For industrial facilities, these hidden operating costs can become significant over time.

Material Selection for Long-Term Performance

PVC Components

PVC is widely used in cooling tower applications because it provides good corrosion resistance and cost efficiency.

PVC Cooling Tower Fillremains one of the most common choices for commercial and industrial cooling systems.

PP Components

For higher temperature environments or aggressive chemical conditions, polypropylene can provide improved durability.

PP Cooling Tower Fillis often selected when additional chemical and temperature resistance is required.

Should You Always Replace Drift Eliminators?

Not necessarily.

If the existing Drift Eliminators are relatively new, structurally sound, and still meet operating requirements, replacement may not be necessary.

However, if the cooling tower is undergoing a major retrofit after many years of operation, replacing both components is often more economical because labor access costs are already included in the project.

Common Retrofit Mistakes

Only Replacing the Visible Components

Many facilities replace the Cooling Tower Fill but ignore other aging components that are harder to access.

A complete inspection usually provides better long-term results.

Selecting Components Separately Without Considering System Performance

Cooling Tower Fill, Drift Eliminators, Air Inlet Louvers, and airflow systems should work together.

During retrofit planning, engineers should evaluate the entire tower rather than choosing components individually.

Other Components Worth Inspecting During Fill Replacement

A Cooling Tower Fill replacement project provides an excellent opportunity to inspect:

• Cooling Tower Air Inlet Louvers
• Water distribution nozzles
• Fan blades and motors
• Fill support structures
• Spray piping systems

Maintenance Checklist Before Retrofit

• ✓ Check current cooling performance
• ✓ Inspect existing fill condition
• ✓ Inspect Drift Eliminators for damage
• ✓ Measure existing component dimensions
• ✓ Confirm material compatibility
• ✓ Review operating water quality

Field Notes

During many cooling tower retrofit projects, the biggest mistake is focusing only on the component that appears to have failed. In reality, cooling towers operate as a complete system. Replacing old Cooling Tower Fill while ignoring damaged Drift Eliminators can leave part of the original problem unresolved.

A well-planned retrofit considers all major internal components together, helping the tower achieve stable performance for many years after refurbishment.

Frequently Asked Questions

Do I need to replace Drift Eliminators when replacing Cooling Tower Fill?

Not always, but it is strongly recommended to inspect them because both components often have similar service periods.

How long do Drift Eliminators usually last?

Service life depends on material quality, UV exposure, operating temperature, and water conditions.

Can damaged Drift Eliminators increase operating costs?

Yes. Increased drift loss can raise water consumption and chemical treatment costs.

Conclusion

Replacing Cooling Tower Fill is often the first step in a retrofit project, but it should not be considered separately from other tower components. Drift Eliminators play an important role in controlling water loss and maintaining efficient operation.

For facilities planning a cooling tower upgrade, inspecting and replacing related components at the same time can improve reliability, reduce future maintenance costs, and help achieve the full benefit of new Cooling Tower Media.