Home » Case Studies » What happens when a rare Niigata ZP-51 propulsion system fails on a critical offshore vessel?
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 propulsion experience to assess and execute the Z-PELLER® Overhaul 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.
