Marine Stainless Steel Gear Fuel Pump

I. Product Overview

The Marine Stainless Steel Gear Fuel Pump serves as the core power unit in a ship's fuel delivery system. It adopts the positive displacement principle, where a pair of high-precision stainless steel gears mesh and rotate to create negative pressure for oil suction and positive pressure for oil discharge through volume changes in the gear tooth grooves. This enables stable and efficient delivery of various fuel media, including diesel oil, heavy fuel oil (HFO), residual oil, and lubricating oil. The product's core advantages lie in the superior corrosion resistance (against sulfur-containing fuels and seawater erosion), high mechanical strength, and excellent wear resistance of stainless steel materials. Additionally, it features a compact structure, stable operation, high head, strong self-priming capability, and adaptability to high-viscosity media, making it a critical component for core scenarios such as main engine fuel supply, inter-tank fuel transfer, fuel filtration and circulation, and heavy oil preheating and delivery. Key flow-through components (drive gear, driven gear, pump body, and pump cover) are constructed from high-quality stainless steel such as 316L, while seals are made of fluororubber (FKM) or perfluoroether rubber (FFKM). The pump is suitable for medium temperatures ranging from -20℃ to 150℃, can handle media with viscosity ≤2000cSt, and boasts a service life of ≥10 years. Fully compliant with IMO "Code for the Safety of Ship Fuel Systems" (MSC.367(92)), ISO 15749 Marine Positive Displacement Pump Standard, and GB/T 10832 Marine Pump Technical Requirements, it has obtained type approval from major classification societies including CCS, LR, ABS, and DNV. It is widely applied in the fuel delivery systems of various vessels such as cargo ships, oil tankers, passenger ships, engineering ships, and ocean-going research vessels.

II. Core Technologies

1. Key Technical Parameters

1.1 Key Technical Parameters

Flow Range: 1-50m³/h, graded to match gear module (2-8mm) and rotation speed (500-1500r/min). Flow pulsation rate ≤2% under rated conditions, ensuring excellent delivery stability.

Head Range: 10-150m, capable of meeting diverse head requirements such as main engine fuel supply (30-80m), high-level fuel tank delivery (80-120m), and high-pressure flushing assistance (120-150m).

Medium Compatibility: Suitable for 0#/-10#/-20# diesel oil, high-sulfur heavy fuel oil (HFO), residual oil, and 46-150# lubricating oil. Resistant to impurities with solid content ≤1% (particle size ≤0.5mm) and compatible with media viscosity 1-2000cSt.

Rotation Speed Range: 500-1500r/min, directly linkable to ship diesel engines and generators. Some models support variable frequency speed regulation, adapting to varying flow demand scenarios.

Self-priming Performance: Self-priming height ≥4.0m (for diesel oil) with priming time ≤60 seconds. No priming required for startup, enabling direct liquid suction from low-level fuel tanks to match typical ship fuel tank layouts.

Operation Precision: Gear meshing clearance ≤0.02mm, volumetric efficiency ≥95%, noise ≤75dB(A), and vibration acceleration ≤2.8m/s² under rated conditions.

1.2 Safety Protection Design

High-pressure Protection: The pump body features an integrally forged stainless steel structure with a design pressure 2.0 times the rated pressure, capable of withstanding instantaneous pressure impacts and preventing high-pressure fuel leakage risks.

Sealing Enhancement: Adopts a dual-seal structure (mechanical seal + lip seal) with silicon carbide-tungsten carbide mating surfaces, suitable for high-temperature and high-viscosity fuel conditions. Leakage rate ≤0.01mL/h with excellent fuel erosion resistance.

Vibration and Impact Resistance: Elastic shock absorbers and stiffeners are integrated between the pump body and base, enabling resistance to ship heel ±30°, trim ±20°, and vibration acceleration of 15g, ensuring stable operation unaffected by ship sway.

Explosion-proof Adaptation: Standard Ex d IIB T4 Gb explosion-proof motor, suitable for Zone 1/2 hazardous areas on ships. Stainless steel components eliminate static accumulation risks, complying with explosion-proof safety requirements for ship fuel zones.

Overload and Over-temperature Protection: Equipped with motor overload protectors, pump body temperature sensors, and fuel leakage detectors. Automatic shutdown and alarm activate when current exceeds 1.1 times the rated value, pump body temperature exceeds 150℃, or fuel leakage occurs, providing comprehensive system protection.

III. Technical Advantages and Innovative Design

3.1 Enhanced Exclusive Advantages of Stainless Steel

Superior Corrosion Resistance and Durability: Stainless steel flow-through components resist long-term erosion from high-sulfur fuels and seawater salt spray, showing no rust after 1000-hour salt spray testing and no wear after 5000-hour high-sulfur fuel delivery testing. Service life is 80% longer than ordinary cast iron gear pumps, significantly reducing ship operation and maintenance costs.

High-purity Delivery: The smooth surface of stainless steel eliminates rust shedding risks, preventing impurity contamination of fuel that could clog main engine injectors. Ensures fuel delivery purity to meet the high-precision fuel supply requirements of ship main engines.

Strong High-temperature Adaptability: 316L and duplex stainless steel maintain stable operation at 150℃ for extended periods. With thermal conductivity superior to conventional materials, they rapidly dissipate internal pump heat, reducing medium temperature and avoiding fuel deterioration under high-temperature conditions.

3.2 Efficient Delivery Optimization

High-precision Gear Design: Utilizes high-precision involute gears processed by five-axis linkage, with nitrided tooth surfaces (hardness ≥HRC60) and precisely controlled meshing clearance. Volumetric efficiency ≥95%, representing a 10%-15% improvement over traditional gear pumps.

High-viscosity Adaptability: Optimized gear tooth profiles and enlarged tooth groove volumes enable stable delivery of heavy oil and residual oil with viscosity ≤2000cSt, supporting startup without additional preheating to match ships using heavy oil as main engine fuel.

Low-resistance Flow Channel: The pump body flow channel features a smooth arc design optimized by 3D simulation, reducing fuel flow resistance, lowering energy consumption, and preventing carbon deposition from high-viscosity fuel retention.

3.3 Convenient Operation and Maintenance

Modular Disassembly and Assembly: Core components (pump cover, gears, seals) use quick-release connections, enabling maintenance without disassembling the entire pipeline. Lightweight yet high-strength stainless steel components minimize damage during disassembly/assembly, with maintenance time ≤40 minutes.

Intelligent Status Monitoring: Equipped with multi-parameter monitoring modules (pressure, temperature, flow, vibration), displaying key operating data in real time and synchronizing with the ship's central control system. Allows remote monitoring by maintenance personnel for proactive fault prediction.

Generalization of Wearing Parts: Wearing parts (seals, bearings, gear shafts) for different flow models have a generalization rate ≥90%. Stainless steel wearing parts support direct replacement, reducing ship spare parts inventory pressure and lowering operation and maintenance costs.

3.4 Wide Scene Adaptability

Multi-medium Adaptation: Quick adaptation to diesel oil, heavy oil, lubricating oil, and other fuels by replacing seals of different materials, achieving "one pump for multiple uses" to meet the needs of ship multi-fuel systems.

Dual Drive Modes: Conventional models support motor drive for fixed fuel delivery points; small-sized models support direct diesel engine drive, enabling flexible movement to emergency fuel delivery scenarios to meet both regular and emergency ship requirements.

Low-temperature/High-temperature Customization: Low-temperature models offer optional thermal insulation sleeves for rapid pump preheating at -20℃ to prevent fuel solidification; high-temperature models use high-temperature resistant seals and duplex stainless steel gears, adapting to 150℃ high-temperature heavy oil delivery.

IV. Typical Application Scenarios

4.1 Main Engine Fuel Supply System

Ocean-going Cargo Ship Main Engine Fuel Supply: 20000kW ocean-going cargo ship main engines are equipped with 316L stainless steel gear fuel pumps (flow rate 15-25m³/h, head 50-80m) for delivering high-sulfur heavy oil to the main engine fuel injection system. Stainless steel's resistance to high-sulfur fuel erosion and high-precision delivery ensure stable main engine operation with a continuous service life ≥8000 hours.

Engineering Ship Main Engine Emergency Fuel Supply: Offshore engineering ships are equipped with duplex stainless steel gear fuel pumps (flow rate 10-15m³/h, head 60-90m) as backup for main engine fuel supply. Rapid startup during main fuel pump failures enables stable delivery of heavy oil containing trace impurities, ensuring uninterrupted engineering ship operations.

4.2 Fuel Tank Transfer System

Oil Tanker Fuel Balanced Transfer: Ocean-going oil tankers use duplex stainless steel gear fuel pumps (flow rate 30-50m³/h, head 80-120m) for balanced transfer of high-sulfur heavy oil between tanks. The integral stainless steel structure resists fuel erosion, and the high-head design meets high-level tank delivery needs with stable, leak-free operation.

Coastal Passenger Ship Fuel Supply: Coastal passenger ships adopt 316L stainless steel gear fuel pumps (flow rate 5-10m³/h, head 30-50m) for delivering shore-based diesel oil to on-board fuel tanks. The explosion-proof motor design suits hazardous areas near fuel tanks, and the hygienic, non-toxic stainless steel ensures fuel purity.

4.3 Fuel Filtration and Preheating Circulation

Heavy Oil Filtration Circulation: Cargo ship heavy oil systems are equipped with 316L stainless steel gear fuel pumps (flow rate 8-12m³/h, head 20-30m) to deliver heavy oil from tanks to filtration devices and preheaters. After impurity removal and temperature elevation (from ambient to 80℃), the fuel is returned to the main engine fuel supply system. Stainless steel's resistance to high-temperature heavy oil erosion ensures stable circulation system operation.

Lubricating Oil Circulation Filtration: Ship auxiliary engine lubricating oil systems use 316L stainless steel gear fuel pumps (flow rate 2-5m³/h, head 10-20m) to circulate lubricating oil through filtration devices, removing impurities and metal chips. Stainless steel prevents rust contamination of lubricating oil, extending auxiliary engine service life.

4.4 Other Auxiliary Fuel Delivery Scenarios

Emergency Fuel Delivery: In the event of main fuel system failures, portable 316L stainless steel gear fuel pumps (flow rate 1-3m³/h, head 20-40m) can be quickly moved to emergency fuel tanks to supply diesel oil to backup generators. No fixed installation is required, adapting to ship emergency response needs.

Special Fuel Delivery for Research Vessels: Deep-sea research vessels use duplex stainless steel gear fuel pumps (flow rate 5-8m³/h, head 40-60m) to deliver specialized fuel for scientific equipment. Stainless steel's non-magnetic properties eliminate interference with navigation systems, and its resistance to deep-sea salt spray ensures reliable operation of research equipment.