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Copper Ejector Fire Pump

Date:2025-07-04Views:

Copper Ejector Fire Pump

I. Product Overview

Marine copper ejector fire pumps are the core equipment of ship fire safety systems, using tin bronze (CuSn10), aluminum bronze (CuAl9Fe4), or brass (CuZn20) as the main materials. Based on the ejector pump principle (Venturi effect), they enable high-efficiency jetting and emergency delivery of high-pressure firewater. The working principle is that seawater or fresh water is pressurized by a centrifugal pump and then forms a high-speed jet through a copper nozzle, creating vacuum negative pressure in the suction chamber to draw in water, which is then pressurized by a diffuser and delivered to fire monitors or foam mixing systems for fire-fighting operations. After solution treatment and passivation coating reinforcement, copper alloys exhibit a corrosion rate <0.02mm/year in seawater with Cl⁻≤20,000ppm, suitable for oil tankers, passenger ships, offshore platforms, etc., meeting IMO International Code for Fire Safety Systems (FSS Code) and classification society certifications (LR, ABS, etc.).

II. Core Technologies and Material Characteristics

1.Copper Alloy Material Selection and Performance

Material Type

Characteristic Advantages

Typical Application Scenarios

Tin Bronze (CuSn10)

10% tin content, excellent seawater electrochemical corrosion resistance, compressive strength ≥350MPa, suitable for conventional sea condition fire-fighting (pressure ≤1.6MPa).

Coastal cargo ship and passenger ship fire protection systems

Aluminum Bronze (CuAl9Fe4)

9% aluminum content, yield strength ≥380MPa, 60% higher impact resistance than tin bronze, adapted to high-pressure (>1.6MPa) and sediment-laden fire-fighting scenarios.

Ocean-going cargo ship and oil tanker fire protection systems

Brass (CuZn20)

20% zinc content, 35% lower cost than bronze, suitable for fresh water and low-salinity seawater (salinity ≤2.5%) fire-fighting, such as inland vessels.

Inland cargo ship and port tugboat fire protection

2.Key Technical Parameters

Flow range: 80-500m³/h, suitable for 2,000-40,000-ton vessels

Head: 80-150m, meeting the international standard for fire monitor range ≥80m

Self-priming capacity: Self-priming height ≥12m, start-up response time ≤18s

Corrosion resistance design: Chromate passivation treatment, 3,000-hour salt spray test passed without rust, 2.8x improved seawater erosion resistance than cast iron

Temperature adaptability: Stable operation at -15℃~80℃

III. Technical Advantages and Innovative Design

1. High-Pressure Jetting and Emergency Capability

Two-stage pressurization structure: Adopts a tandem nozzle and diffuser design to instantly increase water pressure to 2.5MPa, meeting IMO requirements for oil tanker firewater pressure ≥1.2MPa, with maximum jet thrust up to 1,800kN.

Dual-power emergency system: Equipped with a diesel engine and battery pack, automatically switches when the main power fails, ensuring continuous jetting time ≥45 minutes for extreme fire rescue.

2. Anti-clogging and Full-attitude Operation

No rotating parts design: Ejector pumps have no impellers, shafts, or other vulnerable parts, allowing passage of solid particles ≤8mm, reducing clogging risk by 95%.

Anti-tilt performance: Stable water supply under ship heel of 28° and trim of 15°, automatically adjusting flow with tilt sensors to ensure fire-fighting efficiency.

3. Low Maintenance and Cost Advantages

Wear-resistant and corrosion-resistant process: Aluminum bronze impeller surface with supersonic sprayed tungsten carbide (thickness 180μm), 5x improved wear resistance and service life exceeding 40,000 hours.

Modular quick-release structure: Pump body and pipelines use flange quick-connect design, reducing single-component replacement time by 65%, with maintenance costs 35% lower than stainless steel pumps.

IV. Typical Application Scenarios

1. Oil Tanker and Chemical Tanker Fire Protection

Oil fire suppression: Aluminum bronze ejector pumps provide high-pressure seawater for 200,000-ton oil tankers, flow 300-500m³/h, quickly suppressing oil surface fires with foam systems.

Chemical leak disposal: Corrosion-resistant coating resists benzene, hydrochloric acid, and other chemicals, diluting leaks with high-pressure water mist to prevent secondary disasters.

2. Passenger Ship and Cruise Ship Safety Assurance

Fire prevention and control: Silent tin bronze fire pumps (noise ≤78dB) provide fresh water for cruise ships, flow 150-300m³/h, controlling fire spread through monitors and sprinkler systems.

High-temperature equipment cooling: Provides emergency cooling for ship main engines, boilers, and other high-temperature equipment to prevent thermal runaway explosions.

3. Offshore Platform and Port Rescue

Platform fire protection: Aluminum bronze ejector pumps (head ≥120m) meet offshore drilling platform fire protection needs, forming a three-dimensional fire barrier in conjunction with water curtain systems.

Port emergency response: Brass fire pumps on port tugboats can provide cross-ship support, with total flow exceeding 1,200m³/h when multiple units are paralleled for rapid fire suppression.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Ship type: Select aluminum bronze high-pressure type for oil tankers and LNG carriers, tin bronze standard type for ordinary cargo ships, brass for inland vessels

Fire protection requirements: According to IMO requirements, ≥25m³/h flow per 1,000 gross tons is required; recommended selection with 2x safety factor

Environmental conditions: Select aluminum bronze for high-salinity sea areas, tin bronze with electric tracing for cold regions

2. Maintenance Key Points

Daily monitoring: Inspect nozzle wear (allowable loss ≤0.8mm) and bearing temperature (≤70℃) every 500 hours

Regular maintenance: Clean suction strainers (accuracy ≤10mm) quarterly, remove pump cavity scale with 3% citric acid solution annually

In-depth maintenance: Ultrasonic testing every 3 years, reapplying passivation coating and replacing seals

VI. Compliance and Certification

International standards: 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 Fire Protection Systems for Ships

Environmental requirements: Copper ion emissions ≤0.1ppm, 100% recyclable material, compliant with MEPC.279(70) anti-pollution standards

 


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