Copper Screw Cargo Oil Pump

I. Product Positioning and Core Functions

Copper screw cargo oil pumps are precision positive displacement pumps designed for marine and port liquid cargo loading/unloading systems. Using copper alloy screws and bushings, they achieve efficient and stable transportation of crude oil, heavy oil, refined oil, and other cargo through the screw meshing principle. Their core functions include:

Large Flow and High Adaptability: Tri-screw design (contact ratio ≥1.5) enables flow rates of 1-2000m³/h, adapting to cargo with viscosity 3-1500cSt. Heating jackets (suitable for oil temperature ≤150℃) handle high-viscosity heavy oil (e.g., preheating required for viscosity >500cSt).

Explosion-Proof and Safety: Copper alloy screws generate no sparks during meshing. Combined with explosion-proof motors (such as ATEX certification), they safely transport flammable and explosive media like gasoline (flash point ≤-43℃) and sulfur-containing heavy oil.

Marine Environment Adaptability: Anti-tilt design (tilt angle ≤15°) and seawater-resistant materials (such as aluminum bronze) adapt to ship swaying and seawater environments with Cl⁻≤20,000ppm.

Intelligent Control Compatibility: Supports variable frequency speed regulation (accuracy ±1%) and pressure monitoring (accuracy 0.5 class), automatically adjusting flow according to load with energy savings of 15%-25%.

II. Key Materials and Performance Parameters

III. Technical Advantages and Innovative Design

Low Noise and Long Life

Tri-screw synchronous rotation design (speed ≤3000rpm) and precision dynamic balance treatment (residual unbalance ≤5g・mm), vibration value ≤2.0mm/s, noise ≤75dB, extending bearing life to 10,000 hours.

Smooth copper alloy surface (roughness Ra≤3.2μm), scaling rate 60% lower than cast iron, extending maintenance cycles to 12 months.

Intelligent Control and Energy Saving

Standard pressure sensor (accuracy 0.5 class) and temperature monitoring module automatically alarm and switch to standby pumps in case of abnormalities, enabling unattended operation.

Variable frequency control technology automatically adjusts flow according to load, maintaining efficiency ≥70% under variable conditions, with annual energy savings of 15%-25%.

Explosion-Proof and Safety Design

Copper alloy screws and bushings generate no sparks during meshing. Combined with explosion-proof motors (such as ATEX certification), they are suitable for transporting flammable and explosive media like gasoline and aviation kerosene.

Built-in safety valve (full reflux pressure 1.5 times rated pressure) prevents overpressure damage caused by pipeline blockage or misoperation.

Marine-Dedicated Design

Vertical double-layer pump body structure (patent number: CN200720098710) integrates heating and cooling chambers, achieving high-temperature media insulation (oil temperature ≤150℃) and gear bearing cooling simultaneously, saving 30% marine space.

Self-priming height ≤5m, no priming required during startup, enabling efficient oil unloading with residual oil <0.5% during tank cleaning.

IV. Typical Application Scenarios

Marine Loading/Unloading Operations

Crude Oil/Heavy Oil Transportation: 3GR series tri-screw pumps adapt to heavy oil with oil temperature ≤120℃, flow 80-150m³/h, pressure 0.5-2.5MPa, resisting ship tilt (tilt angle ≤15°).

Cargo Tank Cleaning Operations: 2CY series copper screw pumps enable rapid oil unloading, with self-priming performance ensuring no priming during startup, suitable for -20℃~70℃ environments, residual oil <0.5%.

Ports and Oil Depots

Large-Flow Oil Transportation: KCB series copper screw pumps transport gasoline and diesel, flow 1.1-600m³/h, pressure 0.28-2.5MPa, adapting to oil depot loading and ship unloading scenarios.

High-Temperature Media Handling: Vertical double-layer pump body design (patent number: CN200720098710) transports asphalt and residue oil, with heating chambers maintaining oil temperature 80-150℃ to ensure high-viscosity media fluidity.

Industrial and Power Equipment

Generator Sets: ZYB series booster fuel pumps provide 0.5-2.5MPa pressure oil, flow 20-200L/min, adapting to diesel generator fuel injection systems.

Construction Machinery: Aluminum bronze pumps with vibration-resistant design (amplitude ≤0.04mm) transport hydraulic oil to excavators and loaders, pressure 0.5-1.0MPa.

Special Fuel Applications

Aviation Fuel: Precision copper screw pumps (sanitary design) transport aviation kerosene, flow 0.1-10L/min, pressure 0.2-0.6MPa, resistant to CIP/SIP cleaning (135℃, 30 minutes).

Hydrogen Energy Equipment: Tin bronze pumps transport ethylene glycol-containing cooling liquid (freezing point -30℃), pressure 0.5-1.0MPa, suitable for alkaline electrolysis environments (pH 10-12).

V. Selection and Maintenance Key Points

Key Selection Parameters

Media Characteristics: Choose tin bronze for particulate media, aluminum bronze for high-pressure/corrosive media, and brass for conventional scenarios.

Working Condition Matching: Heating jackets for high temperatures (>80℃), aluminum bronze + explosion-proof motors for explosion-proof areas, and electric tracing for low temperatures (<-20℃).

System Compatibility: Select corresponding models based on flow (5-600m³/h), pressure (0.28-2.5MPa), and viscosity (3-1500cSt), e.g., KCB series for large flow, ZYB series for high pressure.

Maintenance Specifications

Daily Monitoring: Record inlet/outlet pressure and bearing temperature (temperature rise ≤35℃) daily; check vibration values (threshold ≤2.5mm/s) weekly.

Regular Maintenance: Clean Y-type filters (filtration accuracy ≤5mm) quarterly; remove oil sludge with special oil cleaners annually; replace mechanical seals when leakage >10 drops/minute.

Special Maintenance: When handling low-sulfur fuel (viscosity ≤1.1cSt), inspect screw surface coating wear and use nanocrystalline copper-based composite materials (friction coefficient ≤0.08) to extend life if necessary.

Compliance Requirements

Industrial pumps must comply with GB/T 13007 Technical Conditions for Gear Pumps; explosion-proof scenarios need ATEX or UL certification; marine pumps require DNV GL or CCS classification society certification.

Food-grade applications need FDA certification; pharmaceutical-grade applications require ISO 10993 biocompatibility testing.