CASE STUDY

Diagnostic Prior to Overhaul Saved ~$52,000 by Optimizing the Scope of One Overhaul

CAT engines

Offshore Jack-Up Rig

Engine Condition Monitoring System

Jack Up Rig Operator In India

A Caterpillar 3516B engine was due for the 2nd Top End Overhaul as per the OEM recommendation based on the running hours, but the rig owner had a budget constraint

Neptunus has been a preferred partner to this customer for engine maintenance across their multiple rigs
Neptunus’ expert advised for pre-overhaul diagnostics using torsional vibration analysis. The objective was to optimize the spare parts list, consumables, manpower and downtime of overhaul
Neptunus’ team went onboard & carried out the engine health inspection through the engine condition monitoring tool. .
The report data showed issues with the fuel injection quality and the crankshaft main bearings. Other health parameters were within acceptable limits. Based on this data, Neptunus recommended only a Top End Overhaul instead of a 2nd Top End Overhaul
The diagnostic findings were reaffirmed when the engine was dismantled for a Top End Overhaul. The hatch marks on the liner & cylinder bore dimensions were observed to be in limits as per the OEM recommendation
Engine has been running smoothly for over 6000 hours after the Top End Overhaul

Direct savings of ~USD 52,000 due to lesser cost of overhaul. This increased the profitability of the rig.
We saved 4 days due to the reduced scope (8 days vs 12 days) thus expediting the rig repair project
It allowed the rig and technical teams to focus on the core drilling operations rather than worry about the
uncertainty of engine reliability.