Marine Copper Sewage Pump

I. Product Overview

Marine copper sewage pumps are core equipment in ship sewage treatment systems, designed specifically to collect and transport mixed liquids such as domestic sewage, kitchen wastewater, and engine room oily sewage. They prevent sewage accumulation from polluting cabins and ensure compliance with discharge regulations. Constructed with naval brass (HAl66-6-3-2) or tin bronze (ZCuSn5Pb5Zn5) as the main material, they achieve efficient transportation of high-impurity sewage through self-priming centrifugal or screw pump principles. A power source (electric motor or hydraulic motor) drives impellers/screws to rotate, generating negative pressure to self-prime and pressurize sewage, which is then filtered through screens and delivered to sewage treatment devices or overboard (after treatment). The pump body undergoes anti-corrosion treatment and precision machining, with a corrosion-resistant service life of ≥8 years in sewage containing acids, alkalis, and oil. It meets IMO Ship Domestic Sewage Discharge Standards (MEPC.227(64)) and sewage equipment certification requirements of classification societies such as LR and ABS, widely used in sewage treatment systems of passenger ships, cargo ships, yachts, and other vessels.

II. Core Technologies and Material Characteristics

1.Copper Material Selection and Performance

2.Key Technical Parameters

Flow range: 2-50m³/h, suitable for 50-5000 ship occupants (e.g., 1000-passenger ships require flow ≥8m³/h)

Head coverage: 10-30m, meeting pressure requirements for transportation from sewage tanks to treatment devices or overboard (including pipeline elbows and grille resistance losses)

Medium compatibility: Capable of conveying domestic sewage (solid content ≤5%), kitchen wastewater (with food residues), engine room oily sewage (oil content ≤10%), and mixed sewage with temperature ≤60℃

Self-priming performance: Self-priming height ≥4m, priming time ≤60 seconds, no manual priming required, suitable for low-level sewage tank accumulation

Anti-clogging capability: Can pass solid particles ≤20mm in diameter (e.g., food residues, fibrous impurities), reducing clogging rates by 70% compared to ordinary sewage pumps

3.Safety and Anti-Pollution Design

Equipped with liquid level linkage devices, automatically starting when sewage tank level ≥300mm and stopping when ≤100mm to prevent damage from dry operation

Inlet fitted with stepped filters: Coarse filter layer (15mm aperture) intercepts large impurities; fine filter layer (5mm aperture) filters small particles, cooperating with cutting impellers to crush fibrous impurities

Explosion-proof design: Motor adopts Ex d IIB T4 explosion-proof grade, suitable for Zone 2 hazardous areas such as engine rooms to prevent safety risks from mixing of oil and gas with sewage

III. Technical Advantages and Innovative Design

1. High-Impurity Sewage Conveying Capacity

Cutting impeller: Uses double-blade serrated impellers to crush solid impurities ≤25mm in diameter (e.g., bones, plastic fragments) with a crushing efficiency ≥95%, avoiding clogging from fiber entanglement.

Wide-channel flow path: Flow path cross-sectional area is 30% larger than ordinary sewage pumps, with flow velocity controlled at 1.5-2.5m/s, preventing impurity deposition while reducing energy consumption (12% more efficient than conventional pumps).

2. Corrosion Resistance and Wear Resistance Enhancement

All-copper flow components: Pump body, impeller, and shaft seal are made of homogeneous copper to avoid galvanic corrosion from contact between dissimilar metals, showing no significant rust after 2000-hour immersion in a 5% salt spray + 5% oil mixture environment.

Surface hardening treatment: Tin bronze components undergo surface quenching, increasing hardness from HB150 to HB250 and improving sand wear resistance by 50%, suitable for inland sandy sewage.

3. Adaptation to Ship Sewage Characteristics

Dry-wet separation design: Motor and pump body adopt a mechanical seal + isolation chamber structure, completely isolating sewage from the motor to prevent motor burnout from liquid leakage, extending seal life to 8000 hours.

Low-noise operation: Impellers and volutes use dynamic and static balance design, with operating noise ≤75dB (at 1 meter), cooperating with rubber shock pads to meet passenger cabin noise requirements (≤60dB).

IV. Typical Application Scenarios

1. Domestic Sewage Treatment

Passenger ship domestic sewage conveyance: 3000-passenger ships are equipped with naval brass sewage pumps (flow 15-25m³/h, head 20m) to transport bathroom and toilet sewage to biochemical treatment devices. Impellers cut hair, paper towels, and other fibrous impurities to ensure stable operation of the treatment system.

Yacht sewage discharge: Compact tin bronze sewage pumps (flow 2-5m³/h) are installed in narrow spaces under decks to pressurize domestic sewage to portable treatment tanks, meeting offshore navigation discharge requirements (COD ≤125mg/L).

2. Engine Room and Special Sewage Conveyance

Engine room oily sewage treatment: Cargo ship engine rooms use naval brass sewage pumps (flow 10-20m³/h, head 15m) to transport oily sewage to oil-water separators. Copper materials resist engine oil corrosion, ensuring a separation efficiency ≥98% (effluent oil content ≤15ppm).

Fishing boat catch sewage conveyance: Tin bronze sewage pumps (flow 5-10m³/h) transport fish tank sewage containing scales and viscera, resisting fishy odor adhesion and extending cleaning intervals to 30 days with self-cleaning filters.

3. Extreme Environment Adaptation

Tropical high-humidity environment: In 40℃, 95% humidity environments, naval brass sewage pumps increase heat dissipation area by 20% (compared to standard models) to control motor temperature ≤75℃, avoiding overheating shutdown.

Polar low-temperature sewage: Tin bronze pumps with heating jackets in -20℃ environments can transport 0℃ domestic sewage (preventing freezing) with flow 8-15m³/h, ensuring normal operation of research vessel sewage treatment systems.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Sewage type: Naval brass pumps for domestic and oily sewage; tin bronze pumps for sandy sewage and fish tank sewage

Flow requirements: Configure 150L per person per day for domestic sewage; e.g., 500-person ships require flow ≥75m³/d (3.1m³/h)

Installation scenarios: Low-noise models for passenger ships; explosion-proof models for engine rooms; compact models for narrow spaces

2. Maintenance Points

Daily monitoring: Check outlet pressure (fluctuation ≤±0.1MPa), bearing temperature (≤70℃), and seal leakage (≤5mL/h) every 500 hours

Regular maintenance: Clean inlet filters weekly; replace mechanical seals (oil-resistant fluoroelastomer) every 1500 hours; inspect impeller wear (allowable radial clearance ≤0.5mm)

In-depth maintenance: Disassemble and inspect every 2 years; acid pickling and passivation of copper components (citric acid + corrosion inhibitor); test crushing capability of cutting impellers (ensuring ≥90%)

VI. Compliance and Certification

International standards: Complies with IMO MEPC.227(64) domestic sewage discharge requirements and ISO 14001 environmental equipment standards

Classification society certifications: Passed type approval by LR, ABS, and CCS (including 1000-hour oily sewage operation tests)

Discharge compliance: When used with sewage treatment devices, effluent quality meets MARPOL Annex IV requirements (BOD ≤50mg/L, suspended solids ≤50mg/L)