Spotting Bunker Quality Problems Early
Bunker quality issues — such as high cat fines, contamination, or sludge formation — can lead to serious engine damage and detention. Here’s how to identify, test, and act quickly.
- Visual Indicators
- Sludgy or dark layer in sample bottles
- Strong chemical or solvent smell
- Separated layers after settling
- Unusual filter clogging soon after bunkering
Take photo or video evidence immediately — an annotated clip showing sludge separation can support later claims.
- Onboard Actions Flow
- Stop using suspect fuel
- Inform Chief Engineer and Master
- Switch to safe tank/fuel
- Seal and label samples
- Notify supplier and P&I Club
- Send samples for lab testing
- Lab Tests to Request
| Test | Purpose |
| Density @15°C | Confirms grade |
| Viscosity | Identifies off-spec fuel |
| Cat Fines (Al+Si) | Indicates abrasive contaminants |
| Total Sediment | Measures stability |
| Water & Sulfur | Checks contamination and compliance |
- Preventive Checklist
- Always witness fuel sampling
- Keep sealed MARPOL samples onboard
- Verify supplier’s quality certificate
- Avoid mixing new fuel with old stock
- If Contamination Is Confirmed
- Isolate affected tanks
- Clean purifiers and filters
- Document fuel consumption and engine performance
- File claim using lab report and surveyor’s statement