TORM Kirsten: 8 Weeks of Continuous Oil Condition Monitoring
Background
Context
TORM Kirsten is SENSYN’s flagship live deployment — LOTUS Beacon has been running continuously on the main engine crankcase system. The ASTER platform aggregates, interprets, and reports on this data, producing the condition assessment report that goes directly to the Technical Superintendent or fleet manager.
This case study covers eight weeks of uninterrupted oil condition data: what it shows, how to interpret it, and why continuous trend monitoring leads to better decisions than periodic lab analysis.
Reference
Oil TDS Reference — Atlanta Marine D 3005
| Parameter | Fresh Oil Value |
|---|---|
| Viscosity @40 °C | ~100 cSt |
| Viscosity @100 °C | 11.0–11.5 cSt |
| Density @15 °C | 0.890–0.895 g/cm³ |
| Dielectric Constant (fresh) | 2.15–2.25 |
| TBN (new oil) | ~10 mgKOH/g |
8-Week Data
Week-by-Week Condition Summary
All viscosity values normalised @40 °C. Viscosity ratio measured against fresh oil baseline of 100 cSt.
| Week | Viscosity @40°C (cSt) | Visc Ratio | Density @15°C | Water Activity (aw) | Moisture (ppm) | TBN | Status |
|---|---|---|---|---|---|---|---|
| W1 (05–11 Nov) | 100–108 | 1.00–1.08 | 0.878–0.882 | 0.04–0.10 | 300–600 | 12.0–12.3 | STABLE |
| W2 (12–18 Nov) | 104–112 | 1.04–1.12 | 0.880–0.885 | 0.06–0.12 | 600–1000 | 11.8–12.1 | STABLE |
| W3 (19–25 Nov) | 108–118 | 1.08–1.18 | 0.883–0.890 | 0.10–0.22 | 800–1400 | 11.6–12.0 | MANAGED |
| W4 (26 Nov–02 Dec) | 112–123 | 1.12–1.23 | 0.888–0.895 | 0.18–0.12 | 1200–1800 | 11.4–11.8 | MANAGED |
| W5 (03–09 Dec) | 118–130 | 1.18–1.30 | 0.890–0.898 | 0.15–0.26 | 600–1500 | 11.2–11.6 | MANAGED |
| W6 (10–16 Dec) | 122–138 | 1.22–1.38 | 0.892–0.900 | 0.14–0.26 | 1000–1500 | 11.0–11.4 | MANAGED |
| W7 (17–23 Dec) | 130–150 | 1.30–1.50 | 0.895–0.905 | 0.14–0.38 | 1000–1300 | 10.8–11.2 | MANAGED |
| W8 (24 Dec–01 Jan) | 138–165 | 1.38–1.65 | 0.898–0.908 | 0.14–0.20 | 800–1300 | 10.6–11.0 | MANAGED |
Blue-tinted rows: shift to MANAGED status from W3 onward.
Interpretation
What the Data Shows
Viscosity & Density
Progressive viscosity rise from W3 — ratio climbs 1.00 → 1.65. This is oxidative thickening: normal aging. Density stays stable throughout, ruling out fuel dilution entirely.
No fuel ingress confirmedWater & Moisture
Moisture exceeds 1,000 ppm from W3 onward. Water activity peaks at 0.38 in W7. Decreasing aw alongside stable moisture in later weeks indicates bound/emulsified water — not a genuine improvement.
Emulsification pattern — trackedTBN
Starts at 12.0–12.3 (above new oil spec of ~10). Declines to 10.6–11.0 by W8 — well above condemnation limit. Continuous renewal maintains alkalinity reserve effectively.
Serviceable — no action requiredKey finding: No abrupt dielectric step changes observed. The correlation of viscosity ↑ + dielectric ↑ + moisture ↑ indicates bound/emulsified water — a pattern only visible through continuous multi-parameter monitoring.
Assessment
Contamination Assessment
| Contamination Type | Finding | Assessment |
|---|---|---|
| Fuel dilution | Not detected | ✓ No density collapse, no viscosity drop |
| Water contamination | Progressive, bound/emulsified from W3 | ⚠ Tracked — consistent with atmospheric RH in later weeks |
| Oxidation / soot | Dominant aging mechanism, later weeks | ⚠ Normal — consistent with renewal rate |
| Additive depletion | Not critical | ✓ TBN remains healthy throughout |
"A ship owner who receives a single lab result showing viscosity 165 cSt and moisture 1,300 ppm may conclude: oil change now."
LOTUS Beacon + ASTER shows these values were reached progressively over 8 weeks of normal service, density is stable, TBN is healthy, and aging is consistent with the renewal rate. An oil change would have been both expensive and unnecessary.
Business Impact
What This Deployment Demonstrates
Unnecessary Oil Changes Prevented
Contextual trend data — not isolated snapshots — enables a confident "no action required" conclusion that a single lab result cannot support.
Early Warning Capability
Moisture exceeding 1,000 ppm from W3 onward was flagged and tracked. If purification had been needed, it would have been visible here in the same way as the water contamination case study.
Client-Grade Reporting
The ASTER report goes to the Technical Superintendent with a clear conclusion and recommendation. This is what subscription value looks like.
Conclusion
Overall Assessment: Controlled Aging, No Action Required
The main engine system oil demonstrates progressive but controlled aging consistent with extended service under continuous renewal conditions. No abnormal contamination or failure mechanism identified. Oil remains serviceable under managed conditions — no immediate oil change required.
Recommendation: Continue condition-based monitoring. Track viscosity ratio and dielectric slope as primary health indicators. ASTER will flag any change in slope that warrants attention.
LOTUS Beacon + ASTER: The System Behind the Result
Continuous inline oil monitoring delivered as a condition report — so your Technical Superintendent gets a decision, not just data.
