Marine Gear Lubricating Oil Pump

I. Product Overview

Marine gear lubricating oil pumps are the "lubrication core" of ship power transmission systems, designed specifically for lubricating oil circulation in equipment such as diesel engines, gearboxes, and turbochargers. They maintain a continuous supply of lubricating oil (viscosity range 20-1000cSt) to form oil films on mechanical component surfaces, reducing friction and wear while dissipating heat. Constructed with tin bronze (ZCuSn10Pb1), cast iron (HT300), or stainless steel (316L) as the main material, they utilize volumetric changes from the rotation of a pair of meshing gears to draw lubricating oil from tanks, pressurize it, and deliver it to lubrication points via pipelines. The pump body undergoes precision machining and anti-corrosion treatment, with a service life of ≥8 years in -20℃~120℃ environments. It meets IMO Guidelines for Ship Machinery Lubrication Systems (MSC.1/Circ.1234) and lubrication equipment certification requirements of classification societies such as RS, LR, ABS, and CCS, widely used in power and transmission systems of oil tankers, cargo ships, passenger ships, and other vessel types.

II. Core Technologies and Material Characteristics

1.Material Selection and Performance

2.Key Technical Parameters

Flow range: 0.5-50m³/h, suitable for equipment power 500-30,000kW (e.g., 10,000kW main engines require flow ≥5m³/h)

Pressure coverage: 0.6-4.0MPa, meeting pressure requirements for transportation from tanks to lubrication points (including pipeline elbows and filter resistance losses)

Medium compatibility: Capable of conveying mineral lubricating oil, synthetic lubricating oil (viscosity 20-1000cSt), hydraulic oil (HL/HM grade), and lubricating media with temperature -20℃~120℃

Self-priming performance: Self-priming height ≥2m, priming time ≤30 seconds, suitable for oil suction from low-level tanks without manual oil filling

Volumetric efficiency: ≥95% under design conditions, 5% higher than gear pumps of the same specification; maintains ≥85% efficiency in high-viscosity (800cSt) media

3.Safety and Anti-Pollution Design

Pressure interlock protection: Triggers an alarm when outlet pressure is below 0.3MPa; safety valve relieves pressure when exceeding 1.2 times the rated value to prevent system overpressure due to pipeline blockage

Impurity filtration system: Inlet fitted with 10μm precision filters to intercept metal debris, sludge, and other impurities; cooperating with optimized gear tip clearance (≤0.05mm) to avoid particle wear on meshing surfaces

Low-noise structure: Gear meshing adopts modified tooth profiles, with operating noise ≤75dB (at 1 meter), meeting engine room noise limit requirements (≤85dB)

III. Technical Advantages and Innovative Design

1. High-Viscosity Media Conveying Capacity

Helical gear meshing design: Uses 45° helix angle helical gears, meshing more smoothly than spur gears. In heavy lubricating oil with 800cSt viscosity, volumetric efficiency is 8% higher than spur gear pumps, with pressure fluctuation ≤±0.1MPa.

Heating auxiliary system: Pump body integrates electric heating jackets (1-3kW power), capable of heating low-temperature high-viscosity lubricating oil (1000cSt viscosity at -20℃) to 40℃ (viscosity reduced to 200cSt), ensuring smooth lubrication during low-temperature startup.

2. Wear Resistance and Corrosion Resistance Enhancement

Bronze gear surface treatment: Tin bronze gears undergo surface nitriding, increasing hardness from HB180 to HB300, improving wear resistance by 50%, and extending service life to 10,000 hours in lubricating oil containing trace impurities.

Stainless steel flow components: 316L pump bodies and gears undergo solution treatment, achieving 5000-hour salt spray resistance, with no rust in coastal high-humidity environments, suitable for oil-gas-containing engine room environments.

3. Adaptability to Ship Operating Conditions

Modular structure: Core pump components (gears, bearings, seals) adopt a modular design, reducing replacement time to ≤2 hours and minimizing ship downtime for maintenance.

Vibration resistance performance: Pump shafts and motors are connected using flexible couplings, with flow attenuation ≤3% when the ship heels ±15° and trims ±10°, ensuring uninterrupted lubrication in severe sea conditions.

IV. Typical Application Scenarios

1. Main Engine and Gearbox Lubrication

Low-speed diesel engine lubrication: 15,000kW low-speed main engines are equipped with tin bronze gear lubricating oil pumps (flow 10-15m³/h, pressure 2.0MPa) to deliver 46-grade oil to crankshaft and camshaft bearings, maintaining stable oil supply pressure at 1.5±0.1MPa and ensuring bearing temperature ≤70℃.

Reduction gearbox lubrication: Container ship main gearboxes use stainless steel gear pumps (flow 5-8m³/h, pressure 1.6MPa) to deliver 100-grade gear oil to meshing tooth surfaces, achieving an oil film thickness ≥5μm and reducing tooth surface wear rate to 0.01mm/1000 hours.

2. Auxiliary Engine and Special Equipment Lubrication

Diesel generator lubrication: 2000kW generators are equipped with cast iron gear pumps (flow 2-3m³/h, pressure 1.0MPa) to provide continuous lubrication to generator bearings and piston pins. When generators operate at 120% rated power, oil supply flow automatically increases by 15%.

Turbocharger lubrication: High-speed turbochargers (rotational speed ≥15,000r/min) are matched with miniature bronze gear pumps (flow 0.5-1m³/h, pressure 0.8MPa) to deliver 32-grade turbine oil to rotor bearings, ensuring lubricating oil consumption ≤0.1L/h and avoiding bearing burnout during high-speed operation.

3. Extreme Environment Adaptation

Polar low-temperature lubrication: In -30℃ environments, gear pumps with heating jackets (3kW power) deliver 50-grade low-temperature lubricating oil, heating oil temperature from -20℃ to 30℃ within 3 minutes and maintaining flow at 2-5m³/h, ensuring proper lubrication during low-temperature startup of research vessel main engines.

Tropical high-temperature lubrication: In 45℃ engine room environments, stainless steel gear pumps deliver 68-grade high-temperature lubricating oil to turbochargers at 4-6m³/h. The pump body's heat sink design controls oil temperature at 55±2℃, preventing lubricating oil from oxidative deterioration due to high temperatures.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Medium viscosity: Cast iron pumps for low viscosity (20-200cSt); tin bronze pumps for medium-high viscosity (200-1000cSt); stainless steel pumps for high-temperature or coastal environments

Flow calculation: Configure 1.5 times the total oil consumption of equipment lubrication points; e.g., a gearbox consuming 0.5m³/h requires flow ≥0.75m³/h

Pressure requirements: 1.6-3.0MPa for main engines and gearboxes; 0.6-1.6MPa for auxiliary engines and turbochargers

2. Maintenance Points

Daily monitoring: Check outlet pressure (fluctuation ≤±0.05MPa), gearbox oil temperature (≤80℃), and seal leakage (≤0.5mL/h) every 400 hours

Regular maintenance: Replace inlet filters every 2000 hours; replace mechanical seals (fluororubber material) every 5000 hours; inspect gear meshing clearance (maximum allowable 0.1mm)

Oil quality management: Test lubricating oil viscosity changes (≤10%) and water content (≤0.1%) every 3 months; replace oil promptly if exceeding standards to avoid corrosion of pump internal components

3. Compliance Inspection

Annual classification society inspection, focusing on verification of volumetric efficiency (≥90%), pressure stability, and compatibility with main engine lubrication systems

Meets IMO requirements for ship machinery lubrication systems, ensuring lubricating oil pressure loss ≤0.2MPa and oil quantity at each lubrication point meets standards

VI. Compliance and Certification

International standards: Complies with ISO 12151 marine gear pump performance standards and IMO MSC.1/Circ.1234 lubrication system guidelines

Classification society certifications: Obtained type approval for gear lubricating oil pumps from RS, LR, ABS, and CCS (including 2000-hour high-viscosity media operation tests)

Material compliance: Flow-through components meet ASTM B584 (tin bronze), ASTM A48 (cast iron), and ASTM A240 (316L stainless steel) standards