Scanjet SC40 Tank Cleaning Machine

Common issues

• Nozzle wear/erosion changing spray pattern and reducing cleaning effectiveness
• Gear train wear causing irregular or stalled indexing rotation
• Seal wear at the swivel/spindle allowing product leakage into the washing line
• Bearing wear causing increased vibration or noise
• Blockage from cargo residue or wax build-up
• Drive mechanism (hydraulic or mechanical) failure reducing wash coverage

Inspection checklist

• Check nozzle bore and spray pattern for erosion/wear
• Verify free rotation through the full programmed indexing cycle
• Check swivel/spindle seals for leakage
• Inspect bearings for play, noise, or overheating
• Check hydraulic drive (if fitted) for leaks and correct pressure
• Verify the machine is correctly rated for the cargo/wash medium in current use
• Check mounting/deck flange for corrosion and secure fit

Service intervals

Critical spares

• Nozzle set
• Swivel/spindle seal kit
• Gear train bearing set

Safety

• High-pressure wash medium - risk of injury from jet impact or hose/fitting failure
• Crude oil washing carries a fire/explosion risk - follow inert gas and COW procedures strictly
• Confined space entry hazard associated with tank access for inspection
• Static electricity generation during washing - bonding/earthing must be maintained per COW procedure

Class survey

Fixed tank cleaning machines used for crude oil washing are typically covered under the vessel's COW system survey. Surveyors want to see the COW operations and maintenance manual, evidence of periodic function testing, and machine certification/rating consistent with the cargoes carried.