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Table of Contents

Case Study

What happens when a rare Niigata ZP-51 propulsion system fails on a critical offshore vessel?

Table of Contents

Background

Industry
Marine
Solution
Critical Overhaul of
Controllable Pitch
Propulsion System
Make & Model
Niigata ZP-51 CP
Propulsion System
Asset
Platform
Supply Vessel

Objective

To execute a critical overhaul of the ultra-rare ZP-51 Controllable Pitch (CP) Propulsion System onboard a Platform Supply Vessel, ensuring vessel operability, class compliance, and prevention of significant financial losses due to downtime.

Challenge / Problem Context

  • Extremely Rare System: The ZP-51 CP system is one of only three in operation globally, with limited repair knowledge and zero field repair precedent.
  • OEM Limitations: Critical spares had long lead times, making OEM support impractical for urgent timelines.
  • Compliance Pressure: A class compliance deadline was rapidly approaching, threatening vessel certification and charter agreements.
  • High Downtime Cost: Every day of delay cost the owner $100,000, making time a critical factor.

What Did We Do?

  • Deployed Expert Team: Assigned three in-house propulsion specialists with over 20 years of Niigata propulsion experience to assess and execute the job.
  • Re-engineered the Scope: Modified the repair strategy to focus on replacing only the steering and stern tube seals—components critical to restoring functionality—eliminating the need for full system teardown.
  • 24/7 Operations: Ran operations in two shifts, round-the-clock, to compress the overhaul timeline and eliminate all potential delays.

Results That We Achieved

  • Rapid Turnaround: Completed the overhaul in just 17 days—significantly ahead of the 30-day OEM estimate.
  • Successful Sea Trials: Vessel passed all sea trials and undocked on Day 18, fully operational.
  • Zero Penalties: Avoided all downtime-related penalties and ensured on-time class compliance, preserving charter commitments.

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