Every barrel counts. Don’t leave yours at the bottom.

Understanding the Challenge

With the U.S. Strategic Petroleum Reserve at historically depleted levels — and active drawdowns underway in response to global supply disruptions — there is no longer any tolerance for recoverable crude oil that never makes it to market. But in thousands of large crude storage tanks across the country, that’s exactly what’s happening.

Sludge accumulates at the bottom of every crude storage tank. Over months and years, heavier hydrocarbon fractions — asphaltenes, paraffins, waxes, and entrained solids — settle and solidify into a dense, immobile layer that conventional pumping and mechanical operations simply cannot recover. In tanks at commercial terminals, pipeline facilities, and strategic storage sites, this sludge layer can consume 10–30% of total tank capacity, locking away barrels that are counted as storage but never delivered as product.

Conventional approaches make the problem worse. Mechanical cleaning — door-sheet cutting, bobcats, shovels, and manual labor inside a confined space — treats this sludge as waste to be disposed of. That means hauling away hazardous material at significant cost while leaving the intrinsic hydrocarbon value on the table. In a supply-constrained environment, that approach is no longer acceptable.

The sludge accumulating in your tanks is not waste. It is recoverable crude oil — and FQE Chemicals has the chemistry to prove it.

Common sludge-forming materials in crude storage:

• Asphaltene deposits
• Paraffin / wax crystallization
• Heavy resid bottoms
• Crude tank heel accumulation
• Entrained production sand and solids
• Pipeline debris and scale
• High-viscosity bitumen fractions

FQE Chemicals’ proprietary tank cleaning process is engineered to do one thing that mechanical methods cannot: dissolve sludge entirely and return it to a pumpable, reusable hydrocarbon. Rather than excavating and disposing of sludge as hazardous waste, our chemistry liquefies it in place — inside the tank, in a closed-loop environment — and returns it to your process stream.

Our chemists custom-engineer a solvent solution using FQE® Solvent-H or FQE® Solvent-H+, blended with a hydrocarbon diluent (cutter stock) sized specifically to the composition of your sludge. This solution is introduced through roof-mounted or manway-mounted circulation nozzles and recirculated continuously, penetrating and dissolving even the most stubborn asphaltene and wax structures. Any solids dissolved by the solvents remain in solution even when pumped to an adjacent tank — eliminating the risk of re-solidification and ensuring the recovered hydrocarbon stays pumpable.

Once the sludge is fully solvated and pumped out for recovery, the tank is degassed and polished using FQE® LEL-Vapor, achieving a superior level of surface and atmospheric cleanliness suitable for inspection, repair, or return to service. The entire process is conducted without manned entry into the tank and without the generation of significant hazardous waste — only inorganic insoluble solids such as rust and production sand remain, classifiable as non-hazardous material.

Proven results across Gulf Coast crude storage operations:

• 95–98.5% hydrocarbon recovery from tank sludge volume
• $400,000 in unexpected revenue generated from a single crude tank cleaning
• Hazardous waste reduced from 10,200 barrels to under 100 barrels on a single project
• >98% of an 18,500-barrel sludge volume recovered from a high-wax content crude tank
• Up to 60% reduction in total cleaning time versus conventional mechanical methods