Stainless Steel Ejector Fire Pump

I. Product Overview

Marine stainless steel ejector fire pumps serve as core equipment in ship fire safety systems, constructed with 316L austenitic stainless steel or duplex stainless steel 2205. Leveraging the ejector pump principle (Venturi effect), they enable high-pressure firewater jet and long-distance transportation. The working principle involves pressurizing seawater or freshwater through a centrifugal pump, forming a high-speed jet via a stainless steel nozzle to create vacuum negative pressure in the suction chamber. This draws in water, which is pressurized by a diffuser and discharged through firewater cannons, foam mixing systems, etc. After solution treatment and electropolishing, the stainless steel operates stably in seawater with Cl⁻≤30,000ppm, offering 60% better corrosion resistance than cast steel. It complies with IMO Fire Safety Systems (FSS) Code and certifications from LR, ABS, DNV, etc., widely used in oil tankers, LNG carriers, passenger ships, and offshore platforms.

II. Core Technologies and Material Characteristics

1.Stainless Steel Material Selection and Performance

2.Key Technical Parameters

Flow range: 100-600m³/h, suitable for 3,000-50,000-ton vessels

Head: 60-180m, meeting international standard of firewater cannon range ≥100m

Self-priming capacity: Self-priming height ≥12m, start-up response time ≤20s

Structural strength: Stainless steel components tested by penetrant inspection (PT), withstanding 4x rated pressure

Corrosion resistance: Electropolished surface (Ra≤0.6μm), passing 6,000-hour salt spray test without rust, achieving the highest IMO anti-biofouling ratin

III. Technical Advantages and Innovative Design

1. High-Pressure Jet and Emergency Capability

Dual-stage pressurization structure: Series nozzles and diffuser design instantly boost water pressure to 3.0MPa, meeting IMO’s mandatory requirement for oil tanker firewater pressure ≥1.2MPa, with maximum jet thrust reaching 2,500kN.

Tri-power emergency system: Equipped with diesel engine, hydraulic energy storage, and battery pack, automatically switching during main power failure to ensure continuous jet ≥60 minutes for extreme fire rescue.

2. Complex Condition Adaptability

Anti-clogging design: Non-rotating structure passes ≤10mm solid particles (e.g., seaweed, rust), combined with intelligent backwash filters (accuracy ≤5mm), reducing clogging risk by 99%.

All-attitude operation: Stable performance under ship trim 30° and list 18°, adapting to wave impact and hull swaying for 24/7 fire system operation.

3. Longevity and Low Maintenance

Wear-corrosion resistance: Stainless steel impeller surface treated by supersonic flame spraying chromium carbide (thickness 250μm), 6x improved wear resistance, service life exceeding 50,000 hours.

Modular quick-release system: Pump body, pipelines, and power units use flange quick-connect design, reducing component replacement time by 85% and life-cycle maintenance costs by 45%.

IV. Typical Application Scenarios

1. Oil Tanker and Chemical Ship Fire Protection

Oil fire extinguishing: Duplex 2205 fire pumps supply high-pressure seawater to 300,000 DWT oil tankers, flow 400-600m³/h, combined with fixed foam systems to suppress oil surface fires rapidly.

Chemical leakage response: Corrosion-resistant coatings withstand benzene, sulfuric acid, etc., diluting leaks with high-pressure water mist to prevent secondary disasters.

2. Passenger Ship and Cruise Safety

Fire prevention: Silent stainless steel fire pumps (noise ≤75dB) supply freshwater to cruise ships, flow 200-350m³/h, controlling fire spread via water cannons and sprinklers for passenger evacuation.

High-temperature equipment cooling: Provides emergency cooling for ship engines, boilers, etc., preventing explosions from thermal runaway.

3. Offshore Platform and Port Rescue

Platform fire protection: High-pressure ejector pumps (head ≥150m) meet offshore drilling platform needs, with water curtain systems for 3D fire barriers.

Port emergency response: Stainless steel fire pumps on port tugs support cross-vessel operations, with parallel flow exceeding 1,500m³/h for rapid fire extinguishing and drainage.

V. Selection and Maintenance Guidelines

1. Key Selection Parameters

Vessel type: Choose duplex 2205 high-pressure type for oil tankers/LNG carriers; 316L standard type for ordinary cargo ships.

Fire protection requirement: According to IMO, each 1,000 GT requires ≥25m³/h flow; recommend 2.5x safety factor for selection.

Environmental conditions: Duplex 2205 with electric tracing insulation is mandatory for high-salinity seas (e.g., Red Sea) and polar operations.

2. Maintenance Essentials

Daily monitoring: Real-time tracking of inlet/outlet pressure and vibration, ensuring pressure fluctuation ≤±10%.

Regular upkeep: Inspect filter/nozzle wear (allowable loss ≤1.0mm) quarterly; test and replace gearbox oil annually.

In-depth maintenance: Disassemble for non-destructive testing every 3 years; reapply passivation coating and calibrate pressure control systems.

VI. Compliance and Certifications

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

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

Environmental requirements: Propulsion flow oil content ≤5ppm; stainless steel is 100% recyclable, meeting MARPOL Annex VI standards.