Marine Cast Steel Ejector Fire Pump

I. Product Overview

Marine cast steel ejector fire pumps are core equipment for ship fire safety systems, using ZG270-500 cast steel or ZG310-570 high-strength cast steel as the main material. Based on the ejector pump principle (Venturi effect), they enable rapid high-pressure firewater jet and long-distance transportation. The working principle is that high-pressure water forms a high-speed jet through a cast steel nozzle, creating vacuum negative pressure in the suction chamber to draw in seawater or freshwater, which is then pressurized by a diffuser for fire fighting through firewater cannons, sprinkler systems, or foam mixing devices. After quenching-tempering treatment and epoxy glass flake coating reinforcement, the cast steel material features excellent impact resistance and seawater corrosion resistance, operating stably in seawater with Cl⁻≤25,000ppm. It meets strict IMO International Code for Fire Safety Systems (FSS Code) and international classification society certifications (LR, ABS, DNV, etc.), widely used in cargo ships, oil tankers, passenger ships, and offshore platforms.

II. Core Technologies and Material Characteristics

1.Cast Steel Material Selection and Performance

2.Key Technical Parameters

Flow range: 80-500m³/h, suitable for ships of 2,000-30,000 tons

Head: 50-150m, meeting international standard of firewater cannon range ≥80m

Self-priming capacity: Self-priming height ≥10m, start-up response time ≤25s

Structural strength: Cast steel components tested by ultrasonic testing (UT), bearing 4x rated pressure

Corrosion resistance design: Epoxy glass flake coating (thickness ≥400μm), passing 5,000-hour salt spray test without rust, 90% improved seawater erosion resistance

III. Technical Advantages and Innovative Design

1. High-Pressure Jet and Rapid Response

Three-stage pressurization structure: Series nozzles and diffuser design instantly increase water pressure to 2.5MPa, meeting IMO's mandatory requirement for oil tanker firewater pressure ≥1.2MPa, with maximum jet thrust up to 2000kN.

Dual-power emergency system: Equipped with diesel engine and hydraulic energy storage, automatically switching when main power fails, ensuring continuous jet ≥45 minutes for rescue in extreme fire conditions.

2. Complex Condition Adaptability

Anti-clogging design: Non-rotating structure passes ≤8mm solid particles (e.g., seaweed, rust), combined with intelligent backwash of suction filters, reducing clogging risk by 98%.

All-attitude operation: Stable working under ship trim 30° and list 15°, adapting to complex sea conditions like wave impact and hull swaying.

3. Long Life and Convenient Maintenance

Wear-resistant reinforcement: Cast steel impeller surface treated by supersonic flame spraying chromium carbide, 6x improved wear resistance, service life exceeding 35,000 hours.

Modular quick-release system: Pump body, pipelines, and power unit use quick-connect flanges, reducing single-component replacement time by 85% and lowering maintenance costs.

IV. Typical Application Scenarios

1. Oil Tanker and Chemical Ship Fire Protection

Oil fire extinguishing: ZG310-570 cast steel fire pumps provide high-pressure seawater for 300,000 DWT oil tankers, flow 300-500m³/h, combined with fixed foam systems to suppress oil surface fires.

Chemical leakage emergency: Corrosion-resistant coating resists benzene, methanol, etc., diluting leaks with high-pressure water mist to prevent secondary disasters.

2. Passenger Ship and Cruise Safety

Fire prevention: Silent cast steel fire pumps (noise ≤70dB) supply freshwater for cruise ships, flow 150-250m³/h, controlling fire spread through water cannons and sprinklers for passenger evacuation.

Emergency cooling: Provides urgent cooling for high-temperature equipment (engines, boilers), preventing explosions from thermal runaway.

3. Offshore Platform and Port Rescue

Platform fire protection: High-pressure ejector pumps (head ≥120m) meet offshore drilling platform needs, 联动 with water curtain systems for 3D fire barriers.

Port emergency: Cast steel fire pumps on port tugs support surrounding ships, with parallel operation flow exceeding 1000m³/h for rapid fire extinguishing and drainage.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Ship type: Choose ZG310-570 high-pressure type for oil tankers/LNG ships, ZG270-500 standard type for ordinary cargo ships

Fire protection requirement: According to IMO, each 1,000 GT requires ≥25m³/h flow, recommended to select with 2x safety factor

Environmental conditions: Epoxy glass flake coating mandatory for seawater; electric tracing insulation needed for polar operations

2. Maintenance Key Points

Daily monitoring: Real-time monitoring of inlet/outlet pressure and vibration, ensuring pressure fluctuation ≤±12%

Regular maintenance: Check filter/nozzle wear (allowable loss ≤1.5mm) quarterly; test and replace gearbox oil annually

In-depth maintenance: Disassemble for non-destructive testing every 3 years, reapply anti-corrosion coating, and calibrate pressure control systems

VI. Compliance and Certification

International standards: Strictly complies with IMO FSS Code Chapter 5 and MSC.451(99) resolution

Classification society certifications: Passed LR Rules for the Classification of Ships and ABS Guide for Ship Fire Protection Systems

Performance testing: Each pump passes 2.5x rated pressure test and 3-hour continuous full-load operation test