Quaternary Annulus Inspection & Cleaning
Precision Cleaning and Inspection for Gas Turbine Combustion Systems
Expert Quaternary Annulus Cleaning Services
Advanced Turbine Support provides professional quaternary annulus cleaning services for gas turbines, ensuring optimal combustion performance and long-term reliability. Our team specializes in cleaning and inspection of the quaternary annulus chamber, fuel paths, and associated components across a wide range of turbine models.
Over time, annulus chambers in forward combustion systems accumulate deposits and oxidation that can restrict quaternary fuel flow. Using a proprietary method to clean and restore your quaternary fuel gas distribution annulus, we remove scale, debris, and corrosion to return your turbine combustion system to peak condition.
Inspection and Cleaning Services for the Quaternary Annulus Chamber
Our inspection and cleaning services focus on identifying buildup inside the quaternary annulus chamber 16, fuel passages, and combustion chamber of the forward section of the turbine.
Advanced Turbine Support technicians access the quaternary fuel gas distribution annulus and fuel inlet orifice 14to eliminate obstructions in the gas turbine fuel chamber components.
Our inspection process includes:
- Borescope and UT Inspection – Verifying wall thickness and cleanliness in the quaternary fuel circuit 12 and distribution annulus chamber 16 extending around the forward combustion section.
- Dry Cleaning Method – A proven method of cleaning the quaternary fuel gas inlet orifice, removing oxidation and debris from inside fuel pathways.
- Mobile Cleaning Unit – Performed on-site with a mobile cleaning unit using a specialized method for cleaning high-temperature fuel paths.
- Post-Clean Verification – Final inspection of the forward casing and turbine combustion casings to ensure unobstructed gas flow.
We can perform the entire cleaning process in one shift—minimizing downtime and ensuring your gas turbine is ready for immediate return to service.
Understanding the Quaternary Annulus in Gas Turbines
In gas turbines such as GE and other OEM models, the quaternary annulus is a circular distribution annulus chamber extending around the combustion chamber. This critical region delivers quaternary fuel into the combustion cans of a gas turbine through multiple quaternary pegs 18.
Scale and contaminants can form inside fuel pathways or channels, reducing airflow and creating pattern imbalances in the combustion chamber. Our team performs inspection and mechanically cleaning the quaternary fuel systems to remove fouling and restore consistent fuel gas in the quaternary system.
The fuel gas distribution annulus chamber involves cutting off blocked fuel pegs, cleaning passages, and reestablishing the gas in the quaternary annulus that ensures even flame propagation.
Method of Mechanically Cleaning the Quaternary Fuel System
Our method of mechanically cleaning involves gaining access to the quaternary annulus and cleaning the annulus channel via the fuel peg openings.
We safely remove the quaternary fuel flange 20, allowing entry through the orifice leading to the quaternary annulus, and use specialized tools to clear buildup from the quaternary fuel inlet orifice leading to the combustion chamber.
Cleaning procedure includes:
- Cutting Off Fuel Pegs – Controlled cutting off the fuel pegs to reach internal obstructions.
- Cleaning the Quaternary Fuel Gas – Restoring the clean gas turbine fuel chamber and associated fuel gas distribution annulus chamber.
- Refinishing & Inspection – Ensuring the quaternary fuel flange and fuel inlet orifice 14 leading to the forward combustion system are free of deposits.
- Reassembly & Testing – Reconnecting quaternary fuel inlets, sealing, and verifying balanced flow distribution.
This method to clean and inspect internal annulus chambers prevents premature failure, improves fuel mixing, and ensures safe, efficient turbine combustion.
Benefits of Quaternary Annulus Cleaning
Regular cleaning of the quaternary annulus chamber extends turbine service life, maintains stable combustion, and supports compliance with OEM and operational standards.
Advantages include:
- Restores full flow through quaternary fuel gas inlets and annulus channels.
- Improves temperature uniformity in the combustion chamber of the forward section.
- Prevents clogging in fuel gas distribution annulus chambers and quaternary fuel flange assemblies.
- Enhances gas turbine reliability by reducing the risk of turbine combustion instability.
- Can be performed at a repair facility or on-site with a mobile cleaning unit for fast turnaround.
With Advanced Turbine Support, your quaternary fuel gas distribution annulus system will remain free of deposits and ready for continuous service.
Why Choose Advanced Turbine Support
Your Partner in Safe, Efficient Turbine Cleaning and Inspection
Comprehensive Combustion Inspection
Evaluation of combustion cans of a gas turbine and fuel gas pathways.
Mobile Cleaning Technology
Performed on-site using a mobile cleaning unit to minimize downtime.
Experienced Technicians
Certified inspection team familiar with gas turbines such as GE and Siemens units.
Fast, Reliable Results
Most cleanings completed within one shift, restoring full fuel delivery performance.
Quaternary Annulus Chamber
Restoring Peak Efficiency with Expert Quaternary Annulus Cleaning
Your turbine’s performance depends on precision airflow—and even minor debris buildup in the quaternary annulus can compromise output, fuel efficiency, and system reliability.
At Advanced Turbine Support, our Quaternary Annulus Cleaning Services use specialized tools and precision inspection technology to remove contaminants, restore optimal flow, and prevent costly performance loss.
Whether performed during an outage or as part of routine maintenance, our process safeguards your turbine against inefficiency, corrosion, and premature wear—delivering cleaner, more consistent combustion and extended operational life.
Certifications
Our ASNT TC-1A–certified inspectors uphold the highest standards of non-destructive testing, ensuring every inspection is performed with precision, safety, and full compliance across all turbine applications.
Gallery
Quaternary Annulus Cleaning
At Advanced Turbine Support, every dye penetrant test represents our commitment to uncovering the smallest surface flaws with precision, ensuring your equipment operates safely and reliably under any condition.
World's Best Gas
and Steam Turbine
Inspection Company
Schedule Your Quaternary Annulus Cleaning Today
If your turbine shows signs of reduced performance, it may be time to service the quaternary annulus. Delaying can lead to fouling, blocked quaternary fuel inlets, and uneven combustion.
Advanced Turbine Support provides expert inspection and cleaning services for gas and steam turbines, restoring efficiency and extending equipment life.
Contact us today to schedule your quaternary annulus chamber cleaning and keep your turbine combustion systems running smoothly.
