TransRec TR-20 200/80

Common issues

• Hydraulic oil contamination causing motor wear and reduced pump speed or output
• Line/column bearing wear along the long drive shaft causing vibration
• Mechanical seal or deck seal leakage allowing cargo vapour toward the hydraulic system or hydraulic oil into the tank
• Cavitation from low tank level / insufficient NPSH causing impeller and casing erosion
• Bottom or thrust bearing wear from sustained axial load, especially during stripping
• Fouling or blockage of the suction strainer/strum box at the pump base
• Hydraulic motor internal wear (leakage past pistons/vanes) reducing torque and stripping performance
• Vibration or bearing-temperature monitoring sensor faults

Inspection checklist

• Check hydraulic oil cleanliness (particle count) and condition
• Verify pump speed against hydraulic flow/pressure matches the expected curve
• Review line bearing / vibration monitoring trend
• Inspect the mechanical/deck seal area for cargo or hydraulic oil leakage
• Verify the gas-tight deck seal barrier between cargo and hydraulic system
• Check the suction strainer/strum box for fouling before cargo operations
• Confirm remote instrumentation (speed, discharge pressure, bearing temperature) reads correctly
• Check pump base/bottom bearing clearance when accessible at dry-dock
• Review stripping performance against the last comparable cargo operation
• Check drive-unit alignment and deck-level support

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Mechanical seal kit / shaft seals
• Line (column) bearings for the drive shaft
• Hydraulic motor seal kit
• Bottom/thrust bearing
• Hydraulic system filter elements
• Deck seal gland packing
• Impeller wear rings (if fitted)

Safety

• Deck seal integrity is the gas-tight boundary between cargo tank and hydraulic power pack - failure can allow cargo vapour into a non-hazardous space
• Seal replacement or hot work requires the tank and pump column to be certified gas-free
• Hydraulic system operates at high pressure - isolate and depressurise before opening
• Running the pump dry or against a closed valve can cause rapid overheating and seal failure
• Static/spark risk during pump removal on flammable cargo tanks - bonding and a gas-free certificate are required

Class survey

Cargo pumps are essential cargo-system equipment. Class typically requires documented pump performance/capacity checks and pressure testing of the pump column/deck seal (the gas-tight boundary) at dry-docking, plus machinery history records where enrolled under Continuous Survey Machinery.

Estimated lifetime: Deepwell cargo pump units are typically designed for continuous service over the vessel's life, with major overhaul every 5-8 years; actual running hours before overhaul vary widely by cargo type and duty - confirm against the maker's service history.