Large Oil Tanker Fixed Pitch Propeller

The Large Oil Tanker Fixed Pitch Propeller (LPP) is a core propulsion component for extremely large crude oil carriers (VLCCs) and Suezmax tankers. It is a massive component, meticulously hydrodynamically designed and cast from a single piece of high-strength copper alloy. Its blades and pitch angle are fixed and non-adjustable. This feature makes it highly compatible with the operational requirements of large oil tankers.

For the LPP, the primary design objective is to match the vessel's optimal efficiency point at a specific draft and speed. Because oil tankers operate on fixed routes and with constant main engine loads, this single operating condition allows LPPs to continuously operate within their most efficient range, maximizing fuel economy. Its core advantage lies in its unparalleled reliability. Compared to controllable pitch propellers, LPPs lack any hydraulic cylinders, servo pistons, or moving parts, resulting in a simpler and more robust structure and a significantly lower failure rate—a crucial consideration for vessels that must transport hundreds of thousands of tons of crude oil with absolute safety.

Manufacturing a qualified Large Oil Tanker Fixed Pitch Propeller (LP) is a prime example of heavy manufacturing. Its diameter often exceeds 10 meters and weighs up to 100 tons, presenting extreme challenges to casting technology. Top-grade nickel-aluminum bronze materials must be used, and precision heat treatment processes are required to ensure mechanical properties and resistance to seawater corrosion. The blade profile of each large oil tanker fixed pitch propeller undergoes complex computational fluid dynamics (CFD) analysis and optimization. The core goal is to suppress cavitation, avoid efficiency loss and blade corrosion, and minimize vibration transmitted to the hull. The final manufacturing process relies on large five-axis CNC machines, which take several days of precision milling to ensure that every inch of the surface is perfectly aligned with the design model. High-precision dynamic balancing tests are also required.

Zhenjiang Jinye Propeller Co., Ltd. holds a key position in this field thanks to its strong heavy-duty manufacturing capabilities. The company possesses comprehensive capabilities to supply ultra-large fixed pitch propellers for 300,000-ton VLCCs. From advanced CFD design, melting and casting of large castings, to heavy-duty five-axis CNC machining and final dynamic balancing, a complete closed-loop process is in place. Every large tanker fixed-pitch propeller produced by Golden Leaf undergoes rigorous non-destructive testing and quality inspection. Its excellent cavitation performance and vibration control level ensure that the ship obtains smooth, efficient and reliable power output, making it the trusted choice of many shipowners and shipyards around the world.