Copper Ejector Sewage Pump

I. Product Overview

Marine copper ejector sewage pumps are high-efficiency environmental protection equipment designed for ship sewage discharge 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 rapid pumping and treatment of ship sewage (containing oil, solid particles, fibrous impurities, etc.). The working principle is that high-pressure water forms a high-speed jet through a copper nozzle, creating vacuum negative pressure in the suction chamber to draw in sewage, which is then pressurized by a diffuser and discharged, suitable for compliant discharge of domestic sewage, engine room sewage, and cargo hold sewage. After solution treatment and passivation coating reinforcement, copper alloys exhibit a corrosion rate <0.03mm/year in seawater with Cl⁻≤20,000ppm, meeting IMO MARPOL Annex IV anti-pollution conventions and classification society certifications (LR, ABS, etc.), widely used in merchant ships, engineering vessels, and offshore platforms.

II. Core Technologies and Material Characteristics

1.Copper Alloy Material Selection and Performance

2.Key Technical Parameters

Flow range: 30-300m³/h, suitable for 500-25,000-ton vessels

Head: 15-50m, self-priming height ≥9m, start-up response time ≤20s

Impurity passing capacity: Passes ≤10mm solid particles and ≤20mm fibrous impurities, clogging risk reduced by 98%

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

Temperature adaptability: Stable operation at -10℃~70℃

III. Technical Advantages and Innovative Design

1. Efficient Sewage Disposal and Anti-Clogging Capability

No rotating parts design: Ejector pumps have no impellers, shafts, or other vulnerable parts. Large-diameter flow channel design ensures smooth transport of rags, sediment, and other impurities, especially suitable for harsh conditions with complex impurities.

Intelligent pulse backwash: The suction chamber is equipped with a differential pressure sensor that automatically activates the pulse backwash system when vacuum decreases due to impurity accumulation, extending the maintenance cycle to 36 months.

2. Complex Condition Adaptability

All-attitude operation technology: Stable drainage under ship heel of 25° and trim of 12°, automatically adjusting flow with tilt sensors to ensure emergency drainage efficiency.

Anti-winding structure: The diffuser inner wall adopts spiral guide grooves to effectively intercept fibrous impurities, increasing system reliability by 90%.

3. Long Life and Low Maintenance

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 45,000 hours.

Modular quick-release structure: Pump body and pipelines use flange quick-connect design, reducing single-component replacement time by 70%, with maintenance costs 40% lower than stainless steel pumps.

IV. Typical Application Scenarios

1. Ship Domestic Sewage Treatment

Passenger ship sewage discharge: Tin bronze ejector pumps treat domestic sewage for cruise ships, flow 60-120m³/h, meeting IMO emission standards with domestic sewage treatment plants (STP).

Crew toilet sewage discharge: Provides negative pressure pumping for multi-deck cabins, self-priming height 10m, avoiding odor accumulation and improving living comfort.

2. Engine Room and Cargo Hold Sewage

Engine room sewage pumping: Aluminum bronze ejector pumps extract oily sewage from engine rooms, flow 50-150m³/h, anti-oil film adhesion design to prevent clogging.

Cargo hold sewage emergency discharge: Rapid drainage in case of cargo hold flooding, meeting SOLAS emergency requirements with emergency drainage systems.

3. Special Ships and Offshore Platforms

Engineering ship sewage systems: Aluminum bronze ejector pumps treat sediment-laden sewage (≤10mm particles) for dredgers, flow 150-300m³/h, outstanding wear resistance in construction.

Offshore platform sewage: High-pressure ejector pumps (head ≥35m) treat platform domestic sewage and industrial wastewater, adapting to complex offshore conditions.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Sewage type: Choose brass or tin bronze for domestic sewage, aluminum bronze for oily/particulate sewage

Ship tonnage: Select tin bronze or brass for <10,000 tons, aluminum bronze for ≥10,000 tons (better strength)

Flow matching: Configure at 2x maximum sewage generation, e.g., 8,000-ton cargo ships recommend flow 120-180m³/h

2. Maintenance Key Points

Daily monitoring: Inspect nozzle wear (allowable loss ≤0.6mm) and bearing temperature (≤70℃) every 500 hours

Regular maintenance: Clean suction grilles (accuracy ≤15mm) quarterly, remove pump cavity oil sludge with special cleaners annually

In-depth maintenance: Ultrasonic testing every 3 years, reapplying passivation coating and replacing seals with wear exceeding 30%

VI. Compliance and Certification

International standards: Complies with IMO MARPOL Annex IV Regulations for the Prevention of Pollution by Sewage from Ships and ISO 15085 ship drainage system specifications

Classification society certifications: Passed LR Rules for the Classification of Ships and ABS Rules for Building and Classing Ships

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