Marine Cast Iron Fuel Oil Pump

I. Product Overview

Marine cast iron fuel oil pumps serve as the "energy hub" of ship power systems, specifically designed for fuel transportation and supply to equipment such as diesel engines and boilers. Constructed with high-strength ductile iron (QT400-18) or gray cast iron (HT250), they enable stable pressurization and precise distribution of fuel oil through the principles of gear pumps, screw pumps, or centrifugal pumps. The working principle involves drawing fuel oil from storage tanks via gear meshing, screw rotation, or impeller centrifugal force, pressurizing it, and delivering it through pipelines to terminal equipment such as engine injectors and burners, ensuring fuel oil participates in the combustion process at stable pressure and flow. The pump body undergoes integral casting and special anti-corrosion coating treatment, withstanding oil temperature environments of -40℃~150℃ and corrosion from heavy oil with sulfur content ≤3.5%, complying with IMO International Convention for the Prevention of Pollution from Ships (MARPOL) and classification society certifications (LR, ABS, etc.), widely used in merchant ships, oil tankers, offshore platforms, and other marine facilities.

II. Core Technologies and Material Characteristics

1.Cast Iron Material Selection and Performance

2.Key Technical Parameters

Flow range: 3-150m³/h, suitable for ship main engine power 300-15,000kW

Head: 30-100m, meeting long-distance and high-drop transportation requirements for fuel oil

Pressure range: Gear pump 0.8-3.5MPa, screw pump 1.5-5.0MPa, centrifugal pump 0.5-1.5MPa

Temperature & corrosion resistance: Stable operation at -40℃~150℃ oil temperature; anti-sulfur corrosion coating resists heavy oil with 3.5% sulfur content

Precision control: Flow pulsation rate <5%, pressure fluctuation ≤±8%

III. Technical Advantages and Innovative Design

1. Efficient and Stable Oil Transportation

Constant pressure frequency conversion technology: Built-in pressure sensor and frequency converter adjust rotation speed in real time, ensuring fuel pressure fluctuation ≤±3% to adapt to different engine operating conditions.

Low pulsation structure: Adopts three-screw or helical gear design, pulsation rate <3%, reducing pipeline vibration and fuel gasification risks.

2. Extreme Condition Adaptability

Low-temperature start-up optimization: Precise matching of gear and pump body clearances, combined with low-temperature sealing materials, enables start-up within ≤10 seconds at -40℃, preventing heavy oil solidification and blockage.

High-temperature anti-leakage design: Water-cooled pump cover and high-temperature resistant fluororubber seal ensure leakage ≤2mL/h at 150℃ oil temperature, preventing safety hazards from fuel leakage.

3. Long Life and Intelligent Operation & Maintenance

Wear-resistant and corrosion-resistant process: Flow-through components treated by tungsten carbide laser cladding, hardness increased to HRC60, wear-resistant life exceeding 60,000 hours.

Intelligent diagnosis system: Integrated with flow, pressure, and temperature sensors, supporting Modbus communication protocol for remote monitoring of anomalies and early warning of faults such as fuel leakage and blockage.

IV. Typical Application Scenarios

1. Ship Main Engine Fuel Supply

Low-speed diesel engine fuel supply: Equips 200,000-ton oil tanker main diesel engines with high-pressure screw pumps, flow 80-120m³/h, pressure 3.0MPa, ensuring combustion efficiency and power output.

Medium-speed diesel engine fuel transportation: Cruise ship auxiliary machines use gear pumps, flow 30-50m³/h, precisely controlling fuel injection to reduce fuel consumption and emissions.

2. Boiler and Auxiliary Equipment

Ship boiler fuel supply: Offshore platform boiler fuel pumps, flow 15m³/h, pressure 2.5MPa, stably transporting heavy oil to support steam generation.

Emergency generator fuel supply: Port tugboat emergency generators equipped with dual-pump redundancy systems ensure continuous fuel supply during sudden power outages.

3. Fuel Bunkering and Loading

Inter-tank fuel allocation: Cargo ships achieve fuel transfer between tanks via centrifugal pumps, flow 50-100m³/h, optimizing ship centroid and stability.

Port fuel bunkering: Refueling ship dedicated fuel pumps, flow 200m³/h, rapidly completing ship fuel replenishment operations.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

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

Power matching: Configure flow at 2%~5% of main engine power, e.g., 8,000kW main engine recommends flow 80-200m³/h

Fuel characteristics: Select high-viscosity pumps for heavy oil, low-resistance pumps for light oil, and enhanced anti-corrosion types for sulfur-containing fuel

2. Maintenance Key Points

Daily monitoring: Inspect oil pressure (fluctuation ≤±0.2MPa), oil temperature (≤130℃), and sealing status every 150 hours

Regular maintenance: Clean oil suction filters (accuracy ≤15μm) weekly, detect fuel impurities monthly, and replace lubricating oil quarterly

In-depth maintenance: Disassemble and inspect gear/screw wear (allowable loss ≤0.2mm) every 2 years, reapplying anti-corrosion coating and replacing seals

VI. Compliance and Certification

International standards: Complies with IMO MARPOL Annex VI fuel sulfur content limits and ISO 8217 fuel system specifications

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

Explosion-proof certification: Optional ATEX Zone 1/2 explosion-proof grade, meeting usage requirements in hazardous areas