Copper Centrifugal Sewage Pump

I. Product Overview

Copper centrifugal sewage pumps are designed based on the centrifugal force transportation principle, using copper and copper alloys (brass, tin bronze, aluminum bronze, etc.) as the core material, providing efficient solutions for pumping and treating industrial wastewater, urban sewage, and marine sewage (containing solid particles, oil, fibrous impurities, etc.). The copper impeller and pump body, combined with anti-clogging structural design, integrate excellent sewage corrosion resistance, solid particle wear resistance, and complex condition adaptability, enabling stable operation in sewage with pH 4-10. They meet the requirements of GB/T 13006 Technical Conditions for Centrifugal Pumps and environmental protection industry standards.

II. Core Materials and Performance Adaptation

1.Tin Bronze (ZCuSn10Pb1) — Preferred for Sewage Corrosion and Wear Resistance

Characteristics

Contains 10% tin and 1% lead, tensile strength ≥350MPa, corrosion rate <0.03mm/year in oily sewage (oil content ≤300ppm), solid particle (≤2mm sediment) wear resistance 5 times higher than cast iron, surface oxide film resists microbial corrosion (such as sulfate-reducing bacteria) in sewage.

Thermal conductivity 150W/(m・K), effectively reducing pump body temperature rise from friction and extending mechanical seal life (temperature resistance ≤120℃).

Application Scenarios

Manufactures key components such as impellers and pump shafts, suitable for pumping industrial oily sewage (such as machining wastewater) and urban domestic sewage (containing feces and kitchen waste), resisting long-term sewage scouring and solid particle wear.

2.Aluminum Bronze (ZCuAl10Fe3) — Benchmark for Impact Resistance and Explosion Protection

Characteristics

Contains 10% aluminum and 3% iron, tensile strength ≥600MPa, impact toughness ≥35J/cm², can withstand water hammer pressure (1.5 times working pressure) during sewage pump startup, no sparks during friction (ignition energy ≥50mJ), complies with Ex nA IIC T4 explosion-proof grade, suitable for sewage environments with combustible gases (such as methane).

In sewage with fibrous impurities (such as rags and plastic ropes), entanglement resistance is 30% higher than tin bronze, impellers adopt open design (blade spacing ≥8mm) to reduce blockage.

Application Scenarios

Pumping corrosive wastewater in chemical parks (such as pH 4-6 acidic sewage) and oily sewage in oil depots, used with explosion-proof motors in flammable and explosive areas; aeration tank sewage circulation pumps in municipal wastewater treatment plants, resisting bubble impact from aeration.

3.Brass (H68 + Nickel Plating) — Lightweight General Application

Characteristics

Contains 68% copper and 32% zinc, density 8.5g/cm³, 4% lower than tin bronze, cost reduced by 30%, salt spray resistance increased by 50% after surface nickel plating (thickness 5-8μm), suitable for non-load-bearing components (such as pump covers and nozzles) and neutral sewage (pH 6-8).

Resistant to fresh water and low-salinity sewage (Cl⁻≤10,000ppm), stable performance in sewage with minor organic matter (COD≤500mg/L).

Application Scenarios

Small sewage treatment stations (treatment capacity ≤100m³/d), temporary drainage pumps for construction sites, flow ≤50m³/h, adapting to non-corrosive sewage pumping in inland rivers or cities.

III. Technical Advantages and Application Limitations

Core Technical Advantages

1. Anti-Clogging Design and Complex Sewage Adaptability

Impellers adopt large-channel open design (flow channel width ≥20mm), capable of passing ≤8mm solid particles, combined with anti-entanglement backward-leaning blades (angle ≥45°) to reduce fibrous impurity entanglement. In oily sewage (oil content ≤300ppm), separation efficiency ≥90%, preventing oil film adhesion from affecting pump efficiency.

2. Corrosion Resistance and Condition Adaptability

Tin bronze impellers have a service life of 8-12 years in urban sewage (pH 6-9), 3 times that of cast iron impellers. The pump body uses an elastic support structure (vibration amplitude ≤0.06mm), adapting to outdoor installation or mobile conditions, ensuring seal leakage ≤15mL/h.

3. High-Efficiency Drainage and Energy-Saving Design

Hydraulic efficiency reaches 70%-80%, 10%-15% higher than traditional cast iron pumps, large-flow models (≥300m³/h) reduce annual energy consumption by 5000-8000kWh. Combined with variable frequency control (accuracy ±1%), flow can be automatically adjusted according to sewage volume (adjustment range 30%-120%).

Application Limitations

1. Strong Corrosion and High-Viscosity Restrictions

Prohibited from transporting industrial wastewater with strong acids (pH<4) or alkalis (pH>10); brass pumps are prone to stress corrosion in ammonia (NH₃)-containing sewage. When transporting thick slurry sewage with viscosity >300cSt, preheat to viscosity ≤150cSt (otherwise efficiency decreases by 30%).

2. Cost and Weight Challenges

Tin bronze pumps cost 3-4 times more than cast iron, density 8.9g/cm³ is 3 times higher than aluminum alloy (e.g., 150mm diameter pump weighs about 32kg), requiring reinforced foundations during installation. Large-flow models (≥500m³/h) have 5%-8% higher energy consumption than stainless steel pumps.

3. Impurity Sensitivity and Maintenance Requirements

Sensitive to solid particles >10mm (such as stones and metal fragments), mandatory basket filter configuration (aperture ≤15mm); otherwise, impeller wear rate increases to 0.1mm per thousand hours. Oily sewage easily forms oil films on copper surfaces, requiring quarterly chemical cleaning (using alkaline degreasers).

IV. Typical Application Scenarios

1. Industrial Wastewater Treatment

Machining Wastewater: Tin bronze pumps drain machine tool wastewater containing emulsions and metal debris, flow 100-200m³/h, head 30-50m, used with oil-water separators for recycling, meeting GB 8978 Comprehensive Wastewater Discharge Standard.

Chemical Wastewater Emergency Discharge: Aluminum bronze pumps drain chemical wastewater containing methanol and styrene, anti-static design (pump body grounding resistance ≤1Ω), adapting to explosion-proof areas (Zone 2), flow 200-400m³/h, head 60-80m.

2. Municipal and Building Drainage

Urban Rainwater and Sewage Pipes: Tin bronze pumps serve as influent lift pumps in wastewater treatment plants, transporting mixed sewage with sediment and domestic waste, impellers with wear-resistant treatment (tungsten carbide coating) to resist long-term scouring, flow 500-1000m³/h, head 15-30m.

High-Rise Building Sewage Pits: Brass pumps drain bathroom sewage (containing feces and tissues), equipped with cutting impellers (blade hardness HRC55-60) to break fibrous impurities, adapting to small sewage lifting devices (flow 10-30m³/h).

3. Marine and Offshore Engineering

Marine Domestic Sewage: Tin bronze pumps drain kitchen and bathroom sewage from cruise ships, used with domestic sewage treatment plants (STP), meeting IMO MARPOL Annex IV discharge standards, impeller surface electrolytically polished (Ra≤0.8μm) to prevent microbial adhesion.

Offshore Platform Oily Sewage: Aluminum bronze pumps drain oily sewage (oil content ≤15ppm) from drilling platforms, resisting mixed corrosion from seawater and crude oil, equipped with emergency shutdown valves (ESD) to close the system within 10 seconds in emergencies.

V. Usage and Maintenance Specifications

1. Sewage Condition Adaptation

Pretreatment Requirements:

Sewage with solid particles must first pass through a grating filter (≥15mm); oily sewage must confirm oil concentration (>15ppm requires prior treatment). When pH<5 or >9, add neutralizing agents to adjust to neutral (pH 6-8).

Temperature Control:

When sewage temperature >60℃, inspect mechanical seal cooling effect (configure external flushing lines, flow 10-15L/min) to avoid seal aging due to high temperature.

2. Maintenance Key Points

Daily Monitoring:

Record inlet and outlet pressure daily (deviation ≤±5%), bearing temperature (temperature rise ≤35℃), equipped with pH sensors (accuracy ±0.1), automatic alarm for abnormal sewage pH;

Check pump body vibration value weekly (threshold ≤2.5mm/s), stop for impeller dynamic balance inspection (residual unbalance ≤8g・mm) in case of abnormalities.

Regular Maintenance:

Clean the filter quarterly (replace the screen when pressure difference >0.15MPa);

Disassemble and inspect impeller wear annually (blade thickness wear ≤1.5mm), remove pump cavity scale with citric acid solution (concentration 3-5%) (soaking time ≤20 minutes);

Replace mechanical seals when leakage >20 drops/minute, replace seal O-rings semi-annually in oily sewage (material preferably perfluororubber FFKM).

3. Compliance Requirements

Products must pass national environmental protection product certification (CCEP), providing copper alloy sewage corrosion resistance test reports (ASTM G48 standard, no pitting after 72-hour immersion);

Sewage pump performance must comply with GB 50014 Outdoor Drainage Design Standard, pump displacement should meet the design flow requirements of wastewater treatment plants (e.g., configured as 1.5 times the maximum daily and hourly flow).