What is tail shaft monitoring?

flowchart LR
    A[Sensors] --> B[Temperature\nVibration\nDisplacement\nLeakage]
    B --> C[Monitoring Unit]
    C --> D[Alarm/Display]
    D --> E[SMS Records]

• Purpose: Detect early wear, misalignment, vibration, temperature rise, oil leakage, loss of propulsion
• Measured parameters: Stern tube bearing temperature, oil temperature, lateral/axial vibration, shaft displacement, oil leakage
• Processing: Monitoring unit triggers alarms on threshold exceedance, logs data for trend analysis
• IACS requirements: UR Z21 surveys propeller/tube shafts for wear/condition; UR Z27 condition monitoring/CBM for machinery including propeller shafts
• ISM Code: Company SMS must include procedures for maintenance, monitoring critical machinery, record-keeping
• Second Engineer duties: Verify system operational, check daily readings/trends vs limits, investigate alarms, record data in PMS, escalate to Chief Engineer on threshold approach/exceedance or suspected defect