Marine Copper Cargo Oil Pump

I. Product Overview

Marine copper cargo oil pumps are core equipment in ship liquid cargo transfer systems, designed specifically for efficient loading, unloading, and in-tank transfer of cargo oil media such as crude oil, diesel, vegetable oil, and chemicals. They enable precise transfer of cargo oil between storage tanks and transport vehicles. Constructed with tin bronze (ZCuSn10Ni2) or naval brass (HAl66-6-3-2) as the main material, they achieve stable transfer of high-viscosity, high-sulfur cargo oil through screw pump or gear pump principles — a power source (electric motor or hydraulic motor) drives screws/gears to mesh and rotate, generating pressure through volume changes in chambers to draw cargo oil from tanks, pressurize it, and deliver it to shore tanks or other chambers via pipelines. The pump body undergoes precision machining and anti-sulfur corrosion treatment, with a corrosion-resistant service life of ≥10 years in sulfur-containing cargo oil (sulfur content ≤3.5%) and ambient temperature environments. It meets IMO International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC Code) and cargo oil pump certification requirements of classification societies such as LR and ABS, widely used in liquid cargo transport vessels including oil tankers, chemical tankers, and multi-purpose cargo ships.

II. Core Technologies and Material Characteristics

1.Copper Material Selection and Performance

2.Key Technical Parameters

Flow range: 10-500m³/h, suitable for ships of 500-50,000 gross tons (e.g., 10,000-gross-ton oil tankers require single pump flow ≥100m³/h)

Head coverage: 20-80m, meeting pressure requirements for cargo oil transfer from tank bottoms to shore tanks (including pipeline elbows and valve resistance losses)

Medium compatibility: Capable of transferring crude oil (API gravity 20-45°), diesel, kerosene, vegetable oil (viscosity ≤1000cSt), low-sulfur cargo oil (sulfur content ≤0.5%), and heated cargo oil with temperature ≤120℃

Viscosity adaptability: With auxiliary heating jackets, can transfer heavy cargo oil with viscosity ≤5000cSt at ambient temperature (viscosity reduces to 500cSt when heated to 80℃)

Explosion-proof rating: Motors adopt Ex d IIBT4 Gb explosion-proof design, suitable for Zone 1 hazardous areas (near cargo oil tanks) to prevent explosions from oil and gas leaks

3.Safety and Transfer Design

Equipped with cargo oil temperature-flow interlock devices: Automatically activates heating systems when cargo oil viscosity exceeds 3000cSt; alarms when flow fluctuations exceed ±10%

Inlet fitted with magnetic filters (adsorbing metal impurities) + coarse filters (5mm aperture) to protect precision components in the pump (e.g., screw meshing surfaces)

Pressure protection: Safety valves automatically relieve pressure when outlet pressure exceeds 1.2 times the rated value, preventing pipeline overpressure rupture

III. Technical Advantages and Innovative Design

1. High-Viscosity Cargo Oil Transfer Capacity

Twin-screw meshing structure: Uses 45° helix angle twin-screw design with meshing clearance ≤0.03mm, achieving volumetric efficiency ≥92% at 1000cSt viscosity — 15% higher than single-screw pumps — suitable for heavy crude oil transfer.

Integrated heating system: Pump body and pipelines are wrapped in steam heating jackets (working pressure 1.0MPa), capable of heating cargo oil from ambient temperature to 80-120℃ (adjusted by oil type) with viscosity reduction rate ≥80%, ensuring smooth transfer in low-temperature environments.

2. Corrosion Resistance and Wear Resistance Enhancement

All-copper flow components: Pump body, screws/gears, and shaft sleeves are made of homogeneous copper alloys to avoid galvanic corrosion from contact between dissimilar metals, showing no significant corrosion after 5000-hour immersion in crude oil with 5% sulfur content.

Surface hardening treatment: Tin bronze components undergo surface nitriding, increasing hardness from HB180 to HB300 and improving wear resistance against sediment in cargo oil by 60%, suitable for crude oil transfer with low impurities.

3. Liquid Cargo Ship Adaptation Characteristics

Modular structure: Core pump components (screws, bearings, seals) feature a modular design, reducing replacement time to ≤4 hours (50% shorter than traditional structures) and minimizing ship berthing downtime.

High-precision metering: Integrates oval gear flowmeters with metering error ≤±0.1%, meeting trade settlement-level precision requirements (e.g., tonnage metering for crude oil loading/unloading).

IV. Typical Application Scenarios

1. Crude Oil and Heavy Oil Transfer

Ocean-going oil tanker unloading: 10,000-gross-ton oil tankers are equipped with tin bronze twin-screw cargo oil pumps (flow 200-300m³/h, pressure 3.5MPa) to heat 380cSt heavy crude oil to 100℃ (viscosity reduced to 200cSt) and transfer it to shore tanks via terminal pipelines, with single-tank unloading time ≤4 hours.

Domestic trade oil tanker transfer: 5000-gross-ton product oil tankers use naval brass gear pumps (flow 100-150m³/h, pressure 2.0MPa) to transfer 0# diesel between tanks with pressure stability ≤±0.05MPa, preventing pipeline leaks from pressure surges.

2. Special Cargo Oil Transfer

Vegetable oil transport: Multi-purpose cargo ships use naval brass cargo oil pumps (flow 50-80m³/h) to transfer palm oil (heated to 50℃) with mirror-polished flow channels (Ra≤0.8μm) to avoid residual oil oxidation, ensuring food-grade safety (meeting FDA standards).

Low-sulfur oil loading/unloading: Ships entering Emission Control Areas (ECA) use tin bronze cargo oil pumps to transfer low-sulfur marine diesel (sulfur content ≤0.1%) without modifications, avoiding dezincification corrosion issues of steel pumps in low-sulfur oil.

3. Extreme Environment Adaptation

Tropical high-temperature transfer: In 45℃ environments, motors with heat sinks control pump body temperature below 60℃, maintaining efficiency ≥85% when transferring light crude oil (flow 150-200m³/h) and preventing overheating shutdowns.

Polar low-temperature startup: In -30℃ environments, heating jackets preheat pump bodies to 50℃ within 30 minutes, enabling smooth transfer of waxy crude oil (heated to 60℃ to prevent wax precipitation) with stable flow 100-150m³/h.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Cargo oil type: Tin bronze pumps for high-sulfur crude oil and heavy oil; naval brass pumps for light oil, vegetable oil, and low-sulfur oil

Flow calculation: Configure 1/4 of total tank volume per hour; e.g., 10,000m³ tanks require flow ≥2500m³/h (multiple pumps in parallel)

Viscosity grade: Twin-screw + heated models for viscosity ≥500cSt; gear models (lower cost) for viscosity ≤300cSt

2. Maintenance Points

Daily monitoring: Check outlet pressure (fluctuation ≤±0.2MPa), bearing temperature (≤80℃), and mechanical seal leakage (≤5mL/h) every 800 hours

Regular maintenance: Clean filters every 2000 hours; replace mechanical seals (oil-resistant fluoroelastomer + silicon carbide) every 5000 hours; inspect screw meshing clearance (repair when exceeding 0.05mm)

Berth maintenance: Flush flow channels with diesel after unloading (removing residual oil deposits); apply anti-rust oil to tin bronze components to prevent oxidative corrosion during idle periods

3. Safe Operation Specifications

Confirm heating systems have heated cargo oil to target viscosity before startup (e.g., ≥80℃ for heavy oil); prohibit cold oil forced startup (prone to motor overload)

Thoroughly flush pump chambers before switching cargo oil types (e.g., from crude oil to diesel) to avoid precipitation from mixing different oil types

VI. Compliance and Certification

International standards: Complies with IMO IBC Code and ISO 13709 requirements for liquid cargo pumps

Classification society certifications: Passed type approval for cargo oil pumps by LR, ABS, and CCS (including 1000-hour high-sulfur crude oil operation tests)

Explosion-proof certification: Ex d IIBT4 Gb explosion-proof grade, meeting ATEX 2014/34/EU and IECEx requirements for equipment in hazardous areas