Marine Cast Iron Gear Cargo Oil Pump

I. Product Overview

The marine cast iron gear cargo oil pump is a key specialized equipment for the ship's cargo transportation system and power support system. It is specially designed for ship's cargo oil loading and unloading, fuel oil transfer between tanks, lubricating oil circulation and various marine oil supply scenarios. Its core function is to form negative pressure inside the pump chamber through the rotational movement of a pair of precision meshed gears to achieve oil suction, and then smoothly deliver the oil to the target tank or equipment through gear extrusion. Relying on the closed transmission characteristics of gear meshing, it can stably transport marine oils of different viscosities (such as diesel oil, heavy oil, lubricating oil, cargo oil, etc.), ensuring the efficient progress of ship's cargo loading and unloading and the continuous supply of oil for the power system. This equipment adopts gray cast iron to manufacture core components such as the pump body, gears and pump cover, matched with oil-resistant and temperature-resistant composite sealing components and a reinforced transmission shaft. It has core characteristics including simple and compact structure, reliable and wear-resistant operation, stable and pulsation-free delivery, strong impact load resistance and economic cost, and can adapt to complex marine and inland river working conditions such as high humidity, strong salt spray, severe vibration and oil containing a small amount of impurities faced by various ocean-going, coastal and inland river ships.

As the "Key Hub for Oil Transportation" of ships, the marine cast iron gear cargo oil pump strictly complies with international and domestic standards such as the International Convention for the Safety of Life at Sea (SOLAS), IMO Marine Machinery Equipment Rules, GB/T 10832-2011 *Marine Pumps* and GB/T 34524-2017 *Technical Conditions for Gear Pumps*. It has obtained certifications from mainstream classification societies such as China Classification Society (CCS) and American Bureau of Shipping (ABS), and is widely used in various ships including 500-100000 ton ocean-going cargo ships, oil tankers, container ships, bulk carriers, coastal transport ships, inland river cargo ships and offshore operation platforms. Compared with stainless steel gear cargo oil pumps, gray cast iron material significantly reduces procurement costs through mature casting technology. At the same time, through targeted oil-resistant and rust-proof double treatment and enhanced gear wear-resistant design, it can fully meet the basic operation needs of conventional marine oil transportation, making it the preferred oil transportation equipment for small and medium-sized ships and conventional cargo ships, and building a "economical and reliable transportation line of defense" for the efficient development of ship cargo transportation and stable power supply.

II. Core Technical Parameters

Pressure Range: Rated working pressure 0.5-2.0 MPa, maximum working pressure up to 2.5 MPa, pressure fluctuation error ≤ ±1.5%. It can meet the transportation pressure requirements for short and medium-distance cargo oil loading and unloading, oil transfer between tanks and multi-layer storage tanks, ensuring stable and controllable oil transportation.

Flow Range: 5-300 m³/h, which can be customized in grades according to the ship's cargo tonnage (500-100000 tons) and oil loading and unloading efficiency requirements. The flow stability error under rated working conditions is ≤ ±2%, adapting to the oil transportation needs of different cargo scales.

Medium Adaptability: It can stably transport various commonly used marine oils such as diesel oil, heavy oil, lubricating oil and cargo oil; suitable for medium viscosity range 5-1200 mm²/s, impurity content ≤ 0.5% (particle size ≤ 2mm); applicable medium temperature range -10℃ to 140℃, which can cope with navigation in low-temperature sea areas and transportation of high-temperature heated oils (such as heavy oil, heated cargo oil).

Material Parameters: Pump body, gears and pump cover are made of gray cast iron (surface treated with oil-resistant and rust-proof painting + electrophoretic coating double treatment); transmission shaft is made of steel (surface treated with chrome plating hardening, hardness ≥ HRC55); seals adopt fluororubber (FKM) + polytetrafluoroethylene (PTFE) composite structure, with excellent oil-resistant, temperature-resistant and corrosion-resistant performance, and leakage ≤ 0.01 mL/h, ensuring no leakage in oil transportation.

Drive Mode: Mainly adopts special marine asynchronous motor drive (protection class IP55, insulation class F), with optional diesel engine drive mode; the motor supports 220V/380V/440V marine standard voltage, and the drive system has overload, overheating, phase loss and pressure abnormality protection functions, which can be linked with the ship's central control system (PLC) to realize automatic start-stop and flow regulation.

Operating Performance: Volumetric efficiency ≥ 92%, total efficiency ≥ 87%; Net Positive Suction Head (NPSH) ≤ 3.5 m, self-priming height ≥ 2.5 m, self-priming time ≤ 35 seconds (at 2m suction lift); operating noise ≤ 76 dB(A), vibration acceleration ≤ 1.2 m/s²; continuous operation life ≥ 8000 hours, supporting 24-hour continuous oil loading and unloading operations, adapting to the uninterrupted cargo transportation needs of ships.

III. Structural Design and Core Advantages

3.1 Core Structural Design

Precision Gear Meshing Structure: Adopts straight gear/helical gear meshing design. The gears are processed by precision grinding, with tooth surface hardness ≥ HRC58 and meshing gap controlled at 0.015-0.03 mm, forming a closed transportation chamber to achieve stable and pulsation-free oil transportation, avoiding oil splashing or pipeline impact; the gear tooth profile is optimized through fluid mechanics to reduce oil transportation resistance, improve transportation efficiency and reduce energy consumption.

Integral Cast Iron Pump Body: The pump body is formed by integral casting process, without splicing welds, with compact and solid structure and strong impact resistance rigidity, which can withstand the during ship navigation and pressure fluctuation during oil transportation; the flow channel in the pump body is polished to reduce oil residue and transportation resistance, and improve the wear resistance of the pump body.

Enhanced Oil-resistant Sealing System: Adopts "mechanical seal + oil seal" double sealing structure. The sealing surface is made of silicon carbide-graphite composite material, and the seal lip structure is optimized according to the gear rotation characteristics, which can effectively resist the erosion of various marine oils; equipped with a seal chamber cooling jacket to reduce the working temperature of the seal assembly, avoid seal failure caused by high-temperature oil, and extend the service life of the seal.

Simple Intelligent Monitoring Module: Equipped with a standardized control box, it can real-time monitor oil transportation pressure, flow rate and pump body operating temperature, and the data can be synchronized to the ship's central control system; supports linkage with oil loading and unloading sensors to realize precise flow regulation and overload automatic shutdown protection, and also has a fault alarm function to facilitate crew to quickly troubleshoot problems.

3.2 Core Technical Advantages

Simple and Reliable Structure, Stable Operation: Adopts a simple structure of gear meshing transmission, with few core moving parts and few fault points, adapting to the complex vibration and working conditions of ships; gray cast iron material has excellent wear resistance, and the gears have a long service life after hardening treatment, which can ensure long-term continuous and stable operation and reduce equipment failure risks.

Economical and Durable, Controllable Cost: Gray cast iron raw materials are easily available and casting technology is mature. Compared with stainless steel gear cargo oil pumps, the procurement cost is reduced by 40%-60%, and the price of maintenance parts is low; the oil-resistant and rust-proof double treatment can adapt to the marine high-salt spray environment, reduce equipment rust loss, and significantly reduce the procurement and operation and maintenance costs of ship cargo transportation equipment.

Wide Adaptability, Strong Working Condition Compatibility: Can stably transport various marine oils such as diesel oil, heavy oil, lubricating oil and cargo oil, adapting to the oil transportation needs of different viscosities and temperatures; excellent low-temperature start-up performance (can start normally at -10℃), which can cope with navigation in frigid sea areas; impact-resistant and vibration-resistant design adapts to different navigation environments such as ocean-going, coastal and inland rivers, ensuring continuous and stable oil transportation.

Convenient Maintenance and Simple Operation: Key components adopt modular design. Wearing parts such as gears and seals can be quickly disassembled and replaced with simple tools without overall disassembly of the pump body; daily maintenance only needs to regularly check oil cleanliness, clean the inlet filter screen and supplement oil-resistant lubricating oil, with a long maintenance cycle (regular maintenance interval ≥ 6 months), reducing the maintenance workload of the crew.

Safe and Compliant, Wide Adaptability: Strictly complies with international and domestic ship safety and oil transportation equipment standards, and has passed multiple rigorous tests by classification societies such as pressure test, leakage test, vibration test and salt spray corrosion test; adapts to the oil transportation systems of various 500-100000 ton cargo ships, and can be simply customized according to cargo tonnage and oil type, with strong adaptability.

IV. Typical Application Scenarios

4.1 Ship Cargo Oil Loading and Unloading Transportation

Cargo oil loading and unloading is the core operation link of cargo ships, which has high requirements for the stability and efficiency of oil transportation. Relying on the stable and pulsation-free transportation characteristics, the marine cast iron gear cargo oil pump can avoid splashing and leakage during cargo oil loading and unloading, ensuring the safety of loading and unloading operations; the rated flow rate of 5-300 m³/h can adapt to the loading and unloading efficiency needs of small and medium-sized cargo ships, and with the intelligent flow regulation function, it can accurately control the loading and unloading speed and improve operation efficiency; the oil-resistant sealing design can effectively resist the erosion of cargo oil, ensuring no leakage during long-term loading and unloading operations.

4.2 Ship Fuel Oil Transfer Between Tanks and Supply

Ship fuel oil needs to be transferred between different storage tanks and supplied to power equipment, which has high requirements for the self-priming capacity and transportation stability of the pump. The marine cast iron gear cargo oil pump has a self-priming height of ≥ 2.5 m, which can quickly realize fuel oil transfer between tanks without additional priming water; the stable transportation characteristics avoid the generation of bubbles during fuel oil transfer, ensuring fuel oil quality; the oil-resistant and rust-proof material is suitable for the long-term contact environment of fuel oil, with a long service life, reducing the failure risk of the fuel supply system.

4.3 Ship Lubricating Oil Circulation Transportation

The lubricating oil of ship power equipment such as main engine and auxiliary engine needs to be circulated to achieve lubrication and heat dissipation, which has strict requirements for the transportation accuracy and stability of the pump. The marine cast iron gear cargo oil pump has a flow stability error of ≤ ±2%, which can accurately control the circulation flow of lubricating oil, ensuring sufficient lubrication of all components of the power equipment; low noise and low vibration operation do not affect the working environment of the power equipment; the temperature-resistant sealing design can cope with the high-temperature working conditions during lubricating oil circulation, ensuring the stable operation of the circulation system.

4.4 Coastal/Inland River Cargo Ship Oil Transportation

Coastal/inland river cargo ships have complex navigation environments and limited maintenance conditions, which have extremely high requirements for the economy and durability of the pump. The marine cast iron gear cargo oil pump is low in cost and convenient in maintenance, can adapt to the coastal high-salt spray and strong vibration environment, and stably provides cargo oil loading and unloading and fuel supply services for cargo ships; it has strong self-priming capacity, can cope with the oil transportation needs during operation in shallow inland river areas, and can be quickly started in emergency situations to ensure the continuous development of cargo transportation operations.

4.5 Special Cargo Ships (Auxiliary Oil Transportation for Small Oil Tankers and Chemical Tankers)

The main oil transportation system of special cargo ships such as small oil tankers and chemical tankers needs supporting auxiliary oil transportation equipment for operations such as inter-tank load balancing and residual oil recovery.

The marine cast iron gear cargo oil pump is suitable for the transportation characteristics of medium and low viscosity oils, can effectively recover residual oil in the tank and improve cargo transportation efficiency; the enhanced sealing design avoids oil leakage polluting the marine environment; the impact-resistant and vibration-resistant design adapts to the complex navigation working conditions of special cargo ships, ensuring the safe and efficient auxiliary oil transportation operations.