Marine Cast Iron Lubricating Oil Pump

I. Product Overview

Marine cast iron lubricating oil pumps serve as the "heart guardians" of ship power systems, specifically designed for lubrication needs of critical equipment such as diesel engines and gearboxes. Constructed with high-strength ductile iron (QT400-18) or gray cast iron (HT250), they enable stable transportation and circulation of lubricating oil through the principles of gear pumps, screw pumps, or centrifugal pumps. The working principle involves drawing lubricating oil from the oil sump through gear meshing, screw rotation, or impeller centrifugal force, pressurizing it, and delivering it to components like engine crankshafts, bearings, and turbochargers to form a lubricating film, reducing wear, lowering temperature, and extending equipment life. The pump body undergoes integral casting and wear-resistant coating treatment, operating stably in oil temperature environments of -30℃~120℃, complying with IMO International Safety Management Code (ISM Code) and classification society certifications (LR, ABS, etc.), widely used in merchant ships, engineering vessels, and offshore platforms.

II. Core Technologies and Material Characteristics

1.Cast Iron Material Selection and Performance

2.Key Technical Parameters

Flow range: 5-200m³/h, suitable for ship main engine power 500-20,000kW

Head: 20-80m, meeting long-distance and high-drop transportation requirements for lubricating oil

Pressure range: Gear pump 0.6-3.0MPa, screw pump 1.0-4.0MPa, centrifugal pump 0.3-1.2MPa

Temperature resistance design: Stable operation in oil temperature environments of -30℃~120℃, high-temperature type withstands 150℃

Wear resistance: Flow-through components treated with tungsten carbide spraying, wear rate ≤0.01mm/1000h

III. Technical Advantages and Innovative Design

1. High-precision Lubrication Assurance

Constant pressure output technology: Built-in pressure compensation valve adjusts flow in real time, ensuring lubrication pressure fluctuation ≤±5% to meet lubrication needs of precision components.

Low pulsation design: Adopts twin-screw or herringbone gear structure, pulsation rate <3%, avoiding abnormal equipment wear caused by oil pressure fluctuations.

2. Extreme Condition Adaptability

Low-temperature start-up optimization: Precise control of gear and pump body clearance, combined with low-temperature sealing materials, start-up time ≤8s in -30℃ environment.

High-temperature protection structure: Uses water-cooled pump body or thermal insulation coating, bearing temperature ≤75℃ at oil temperature 120℃, preventing lubricating oil carbonization failure.

3. Long Life and Intelligent Maintenance

Wear-resistant and corrosion-resistant process: Impeller and gear surfaces treated by laser quenching, hardness increased to HRC55, service life exceeding 50,000 hours.

Intelligent monitoring system: Integrated with temperature, pressure, and vibration sensors, supporting 4G remote transmission, early warning of faults such as bearing wear and oil leakage.

IV. Typical Application Scenarios

1. Ship Main Engine Lubrication

Low-speed diesel engine lubrication: Provides high-pressure lubricating oil for 100,000-ton cargo ship main diesel engines, flow 80-120m³/h, ensuring continuous lubrication of crankshafts and bearings.

Medium-speed diesel engine cooling lubrication: Cruise ship auxiliary machines use centrifugal lubricating oil pumps, flow 30-50m³/h, combining lubrication and cooling functions.

2. Transmission System Protection

Gearbox lubrication: Engineering ship propulsion gearboxes equipped with screw lubricating oil pumps, pressure 2.5MPa, ensuring gear meshing accuracy under high torque conditions.

Shafting bearing lubrication: Oil tanker stern shaft bearings achieve circulating lubrication through gear pumps, preventing corrosion and wear caused by seawater intrusion.

3. Auxiliary Equipment Maintenance

Generator lubrication: Offshore platform standby generator lubricating oil pumps, flow 15m³/h, ensuring equipment is always ready for use.

Hydraulic system oil supply: Port tugboat hydraulic rudders use high-pressure gear pumps, pressure 3.0MPa, ensuring sensitive steering system response.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Equipment type: Choose high-pressure screw pumps for main diesel engines, gear pumps or centrifugal pumps for auxiliary machines

Power matching: Configure flow at 1%~3% of main engine power, e.g., 5,000kW main engine recommends flow 50-150m³/h

Environmental conditions: Select low-temperature type for cold seas, water-cooled heat dissipation pump body for high-temperature engine rooms

2. Maintenance Key Points

Daily monitoring: Inspect oil pressure (fluctuation ≤±0.1MPa), oil temperature (≤85℃), and sealing status every 200 hours

Regular maintenance: Clean oil suction filters (accuracy ≤20μm) monthly, replace lubricating oil (ISO VG32-VG100) quarterly

In-depth maintenance: Disassemble and inspect gear/screw wear (allowable loss ≤0.3mm) every 3 years, replace aging seals

VI. Compliance and Certification

International standards: Complies with IMO ISM Code and ISO 13007 ship lubrication system specifications

Classification society certifications: Passed certifications by LR, ABS, DNV GL, and other authoritative institutions

Environmental requirements: Lubricating oil leakage ≤5mL/h, 100% recyclable material, compliant with MEPC anti-pollution standards