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AdViSe: Early Detection Prevents Costly Purifier Damage

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AdViSe: Early Detection Prevents Costly Purifier Damage
Days to Resolution
0
Cost Avoidance
$ 0
Downtime Saved
0 Hours
Max Threshold Breach
0 %
  • Incident Overview

Vessel Type

Containership

Detection Date

12 January 2023

Equipment

H.F.O Purifier No1

Sensors

USB powered MEMS triaxial AdViSe sensor

Detection Method

AdViSe Handheld device

Measurement Frequency

1 measurement every 3 months
It was an ordinary day in January 2023 when the engine crew conducted routine checks using the AdViSe Handheld system. H.F.O Purifier No.1 showed no visible issues or alarms. However, vibration data revealed increased RMS velocity and harmonics at the lower vertical shaft bearing. The early detection avoided an estimated $4,800 in damage, proving AdViSe’s diagnostic value.
  • Problem Identification

Detected Symptom

Elevated RMS velocity and multiple harmonics of spindle shaft 1st order measured at purifier vertical shaft lower bearing.

Fault Type

Spindle shaft lower bearing increased clearance.

Signal Characteristics

  1. 01.
    RMS velocity 15% above threshold value (Jan 12, 2023)

  2. 02.
    25% above threshold value after 3 months follow-up

  3. 03.
    Existence of spindle shaft multiple harmonics in frequency spectrum

  • Actions & Corrective Measures

Action Taken

Overhaul maintenance and bearings set replacement

Repair Date

27 April 2023

Post-Repair Status

Vibration levels returned to normal
  • Conclusions
  1. 01.
    Fault detection prevented system total failure, extended damages and downtime.

  2. 02.
    AdViSe Handheld system accurately identified and classified the issue, allowing planned maintenance.

  3. 03.
    Diagnostic method based on spectrum analysis proved effective in real ship conditions.

  4. 04.
    Estimated cost avoidance: $4,800

Analysis Process

2023-01-12
Initial Deviation Detection
AdViSe Handheld system detected elevated RMS velocity (15% above threshold) and multiple harmonics at H.F.O Purifier No.1 vertical shaft lower bearing.
2023-01-12
2023-03-24
Trending Analysis
Follow-up measurement showed 25% increase above threshold value. Condition reclassified from 'Fair' to 'Marginal' via automated AdViSe Health Report.
2023-03-24
2023-04-27
Corrective Action Completed
Overhaul maintenance and bearing replacement completed. System returned to normal operation with 'Satisfactory' vibration levels.
2023-04-27
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