Are you overlooking blade coverage and spray distribution in compressor cleaning effectiveness?

You schedule regular gas turbine compressor washes. You've selected the most appropriate cleaning chemicals possible. You may reasonably presume your washes are effective at removing foulants... What if your detergent is missing entire sections of the compressor, leaving hidden contamination that kills performance?

Blade coverage and spray distribution are critical to ensuring the most effective gas turbine compressor cleaning possible. But why are these factors so important, and how can you improve them? Let’s find out…

What happens during gas turbine compressor cleaning?

During a gas turbine compressor cleaning cycle, atomized water/cleaning chemicals are sprayed directly into the compressor. This washes the internal surfaces via a combination of:

• physically dislodging deposited fouling
• specialist chemicals breaking down and/or dissolving foulants.

Once fouling is removed, the system is thoroughly rinsed until conductivity targets are achieved.

While the process sounds simple, cleaning effectiveness depends heavily on how evenly the spray reaches internal compressor surfaces.

Why full blade coverage matters

The concept is straightforward: a cleaning solution can only clean the surfaces it actually contacts.

Any areas missed during the wash cycle remain fouled, reducing the effectiveness of the cleaning process and impacting overall turbine performance.

Even when the correct detergent is used, poor spray distribution can lead to:

• Uneven cleaning across compressor stages
• Increased rinse requirements
• Reduced compressor efficiency recovery
• Higher fuel consumption
• Avoidable performance losses

In many cases, inconsistent spray coverage quietly limits the effectiveness of otherwise well-designed cleaning programs.

Where are some systems falling short?

Field observations on certain GE units during online washing showed visible streaking patterns across the bellmouth and compressor blades.

In several cases:

• Blade tips appeared cleaner than root sections
• Some areas showed evidence of water contact, while others remained visibly fouled
• Spray coverage appeared uneven across the compressor face

These observations suggested that airflow dynamics and nozzle positioning were significantly influencing spray distribution and overall cleaning coverage.

Does full coverage matter with water-only washes?

Some operators use water-only online washing programs and assume spray distribution is less critical without detergents involved.

However, field observations on certain GE 7FA units using water-only online washing suggested otherwise.

Operators observed that:

• Water appeared to be pushed back toward the bellmouth during operation
• Center and root blade sections appeared less effectively cleaned
• Airflow patterns strongly influenced where the water traveled

Whether using water-only washes or specialized cleaning chemicals, full blade coverage and consistent spray distribution remain essential for effective compressor cleaning.

What makes Rochem different?

Rochem FYREWASH® nozzles are engineered to inject atomized spray directly into the airflow zone ahead of the compressor face to improve overall blade coverage.

Three primary factors determine how effectively a cleaning solution reaches compressor surfaces:

• Nozzle positioning
• Atomization quality
• Spray trajectory

Understanding how these variables interact has allowed Rochem to develop advanced nozzle technology designed to achieve more complete and consistent blade coverage.

Cleaning nozzle evolution

Rochem has spent decades developing compressor cleaning technology through field testing, operational experience, and ongoing product refinement.

During a site visit in Lake Charles, earlier-generation nozzle designs from the 1990s revealed several limitations, including:

• Visible gaps between spray zones
• “Scalloping” effects between nozzle placements
• Uneven coverage across portions of the compressor face

Since then, Rochem’s nozzle technology has continued to evolve through extensive testing and real-world operating experience.

Today’s nozzle designs are engineered to improve spray consistency, optimize atomization, and enhance overall cleaning performance.

Comparison of OEM nozzle configuration vs Rochem FYREWASH® design

Rochem cleaning nozzles are installed at facilities around the world and are manufactured using high-quality materials with in-house testing performed at the company’s UK workshop.

Operators of GE 7FA and EA units have reported noticeable improvements following nozzle upgrades, particularly in spray consistency and cleaning effectiveness.

Our customers are overwhelmingly pleased with the results our nozzles and technology achieve.

Find out more

Nozzle positioning, atomization, and spray trajectory all play a critical role in determining whether the cleaning solution fully reaches the compressor surfaces.

If spray coverage is compromised, operators risk:

• Uneven cleaning
• Higher rinse water usage
• Reduced compressor performance recovery
• Lost efficiency opportunities during every wash cycle

Effective compressor cleaning isn’t just about choosing the right detergent.

It’s about delivering that solution evenly and consistently throughout the compressor.

If you’re considering upgrading your gas turbine compressor cleaning nozzles, Rochem FYREWASH® can help improve spray coverage and cleaning effectiveness across your operation.