Accredited Bunker & Residual Fuel Testing
AGT Labs provides professional Fuel Oil Testing for marine and heavy industrial fuels. Our Houston laboratory performs ISO/IEC 17025 accredited testing for hydrogen sulfide in the vapor phase above residual fuel oils, Ramsbottom carbon residue, density and API gravity, and copper strip corrosion.
Our analytical services support ship owners, bunkering terminals, and power plants with accredited technical data. Whether checking Very Low Sulfur Fuel Oil (VLSFO) blends or heavy fuel oil (HFO) for hydrogen sulfide hazards before transfer, we provide the results needed to protect crews, assets and schedules.
Accredited Test Parameters
Every fuel oil test listed below is on our PJLA ISO/IEC 17025 scope of accreditation (Certificate L25-276).
Hydrogen Sulfide (Vapor Phase)
ASTM D5705Ramsbottom Carbon Residue
ASTM D524Density & API Gravity
ASTM D5002Copper Strip Corrosion
ASTM D130Industries We Serve
Providing specialized heavy fuel data across the maritime and industrial sectors utilizing our specialized analytical services.
Marine Shipping
Measuring hydrogen sulfide above bunker fuels to protect crews during bunkering and storage.
Bunkering Terminals
Verification of VLSFO and HFO blends before custody transfer including density and H2S checks.
Power Generation
Monitoring heavy fuel oil quality for base-load and backup power plants with carbon residue and density data.
Industrial Boilers
Testing residual fuels for carbon residue and corrosiveness to support safe boiler operation.
Fuel Traders
Independent analysis for cargo trading, blending verification, and resolving commercial quantity/quality disputes.
Insurance & P&I Clubs
Accredited fuel data to support investigations of off-spec bunker and H2S claims.
Laboratory Capabilities
Analytical Systems
Our laboratory uses length-of-stain detector tube systems for vapor-phase H2S, gravimetric carbon residue equipment, digital density meters and copper strip corrosion baths, and is equipped to handle heavy residual fuels and VLSFO blends.
Advanced Technical Support
- ISO/IEC 17025:2017 Accredited Laboratory Operations
- Rapid Turnaround for Demurrage-Sensitive Operations
- H2S Vapor-Phase Screening for Residual Fuels
- Samples Accepted Nationwide at Our Houston Laboratory
Sampling, Handling & Chain of Custody
Accurate Fuel Oil Testing starts with representative sampling, especially for identifying stratified contaminants. We provide bunker drip samplers and proper containers with a completed CoC.
Download Chain of Custody FormContainers & Handling
- Use clean metal cans or high-density plastic bottles approved for heavy fuels.
- Ensure drip sampling is continuous throughout the bunkering process (MARPOL sample).
- Label clearly with Vessel Name, Bunker Delivery Note (BDN) number, and Port.
Transport & Logistics
- Seal samples with tamper-evident tags recorded on the BDN.
- Expedited shipping to our Houston lab for immediate testing upon vessel arrival.
- Retained samples stored for dispute resolution per maritime regulations.
Quality & Reporting
Reports from our laboratory testing offer definitive proof of quality for regulatory bodies and commercial partners.
- Secure PDF Delivery via automated client technical portal.
- Measurement uncertainty available on request.
- Expert consultation on fuel treatment and handling.
Frequently Asked Questions
Which fuel oil tests are accredited at AGT Labs?
Why test hydrogen sulfide in fuel oil?
Do you support bunker quality disputes?
How fast can I get bunker fuel results?
Certify Your Bunker Quality with Fuel Oil Testing
Need reliable accredited Fuel Oil Testing for Houston maritime operations? Contact our Houston technical team today for a custom analysis quote.
Contact Technical Specialist