Marine Stainless Steel Screw Cargo Oil Pump

I. Product Overview

The marine stainless steel screw cargo oil pump is a core key equipment in the ship's cargo fuel delivery system, specifically designed for the loading, unloading and transfer operations of cargo oil tanks of various ships. Its core function is to stably deliver crude oil, diesel oil, fuel oil, lubricating oil and various chemical cargo oils, ensuring the efficiency and safety of ship cargo loading and unloading. This equipment adopts high-quality 304/316L stainless steel to manufacture core cargo oil-contacting components such as screws, pump bodies and bushings, matched with corrosion-resistant sealing assemblies and reinforced transmission shafts. It has extremely strong acid and alkali resistance, salt spray resistance and cargo oil pollution prevention performance, and also has the inherent characteristics of screw pumps such as stable delivery, low pulsation and strong self-priming capacity. It can adapt to extreme working conditions such as high humidity, strong salt spray, complex cargo oil media and vibration faced by various ocean-going and coastal transport ships.

As a core component of the ship's cargo transportation system, the marine stainless steel screw cargo oil pump strictly complies with international and domestic standards such as the International Convention for the Safety of Life at Sea (SOLAS), IMO International Convention for the Prevention of Pollution from Ships (MARPOL), GB/T 10832-2011 *Marine Pumps* and GB/T 3216-2005 *Rotodynamic Pumps - Hydraulic Performance Acceptance Tests - Grades 1 and 2*. It has obtained certifications from mainstream classification societies such as China Classification Society (CCS), American Bureau of Shipping (ABS) and Lloyd's Register (LR), and is widely used in various cargo ships including ocean-going oil tankers, chemical tankers, liquefied gas carriers, multi-purpose cargo ships, coastal transport ships and offshore oil storage platforms. Compared with cargo oil pumps made of cast iron and ordinary steel, stainless steel can completely solve the problems of cargo oil corrosion and medium pollution, greatly improve the reliability and service life of the equipment under complex cargo oil delivery conditions, and build a core line of defense for the safe and efficient development of ship cargo operations.

II. Core Technical Parameters

Flow Range: 10-500 m³/h, which can be customized in grades according to ship tonnage (5,000-100,000 tons) and cargo oil loading/unloading efficiency requirements. The flow stability error under rated working conditions is ≤±1.5%, ensuring accurate measurement and efficient delivery of cargo oil loading and unloading.

Pressure Range: 0.6-4.0 MPa, with a maximum working pressure of up to 5.0 MPa. It can meet the pressure requirements of long-distance cargo oil delivery pipelines and multi-layer cargo oil tanks, ensure the stable flow of cargo oil in complex pipeline layouts, and improve loading and unloading efficiency.

Medium Compatibility: It can stably deliver crude oil, 0#/10# diesel oil, heavy oil, fuel oil, lubricating oil and various chemical cargo oils (methanol, ethylene glycol, light fuel oil, etc.); suitable for cargo oil viscosity range of 1-500 mm²/s, impurity content ≤0.02% (particle size ≤0.2mm); applicable medium temperature range is -30℃ to 180℃, which can meet the needs of navigation in low-temperature sea areas and high-temperature cargo oil delivery.

Material Parameters: Screws, pump body, bushing and inlet/outlet flanges are made of 304/316L stainless steel; transmission shaft is made of stainless steel (surface hardened); seals are made of fluororubber (FKM) or perfluoroether rubber (FFKM), which have excellent compatibility with various cargo oil media and ensure no leakage, no corrosion and no medium pollution during long-term operation.

Drive Mode: Mainly adopts marine explosion-proof motor drive (three-phase asynchronous motor, protection class IP55/IP65, explosion-proof class Ex d IIB T4), with optional hydraulic drive or speed increaser drive mode; the motor supports marine standard voltages of 220V/380V/440V, and the drive system is equipped with overload, overheating, phase loss and dry running protection functions, which can be linked with the ship's cargo transportation control system.

Operating Performance: Volumetric efficiency ≥96%, operating noise ≤68 dB(A), vibration acceleration ≤0.8 m/s²; self-priming height ≥6 m, self-priming time ≤30 seconds (at a suction lift of 5m); continuous operation life ≥10,000 hours, with self-lubrication function and long maintenance cycle, which can meet the needs of 24-hour continuous loading and unloading operations.

III. Structural Design and Core Advantages

3.1 Core Structural Design

Integrated Stainless Steel Screw Structure: Adopts single-screw/double-screw integral forging forming process. The screw tooth profile is precision ground, and the meshing gap with the stainless steel bushing is uniform, ensuring stable operation without pulsation. It can effectively reduce the shear force during cargo oil delivery, avoiding the deterioration of volatile and oxidizable cargo oil; the surface of stainless steel is smooth, not easy to adhere to cargo oil residues, and reducing the risk of pipeline blockage.

Precision Sealing and Anti-Leakage System: Adopts a triple-seal structure of "mechanical seal + labyrinth seal + O-ring". The sealing surface is made of silicon carbide-graphite composite material, which specifically solves the problems of cargo oil penetration and corrosion, with a leakage rate ≤0.001 mL/h; equipped with a seal chamber pressure monitoring and temperature alarm device, which can give real-time early warning when the sealing performance decreases or the temperature is abnormal, avoiding pollution or safety hazards caused by cargo oil leakage.

Compact Anti-Vibration Protection Design: The pump body is integrally cast from stainless steel, with a compact structure and light weight (50-800 kg), which can be flexibly installed in limited spaces such as the ship's cargo oil pump room and deck; the exterior is equipped with a stainless steel protective cover, which has salt spray resistance, impact resistance and seawater erosion resistance; the base adopts high-strength elastic shock absorption supports, which can effectively buffer the vibration during ship navigation and loading/unloading operations, avoiding resonance with the hull structure.

Intelligent Monitoring and Control Module: Equipped with a dedicated intelligent control box, which real-time monitors key parameters such as the operating temperature, inlet and outlet pressure, flow rate and motor speed of the pump body. The data can be synchronized to the ship's central control system and cargo transportation monitoring platform; it has automatic start-stop, overload protection, dry running protection, high-temperature protection and low liquid level protection functions. It will automatically shut down and record fault information under abnormal working conditions, facilitating quick troubleshooting by the crew.

3.2 Core Technical Advantages

Superior Corrosion and Pollution Resistance: 304/316L stainless steel has extremely strong corrosion resistance to various cargo oils (sulfur-containing crude oil, chemical cargo oil, etc.), seawater and salt spray. After 8,000 hours of cargo oil immersion test, there is no obvious corrosion or pitting; stainless steel has strong chemical stability and will not chemically react with cargo oil, which can completely avoid cargo oil pollution and ensure cargo quality, especially suitable for the clean delivery needs of chemical tankers.

Stable and Efficient Delivery: The inherent positive displacement delivery principle of the screw pump combined with the precision stainless steel meshing structure ensures stable and pulsation-free cargo oil delivery with accurate flow rate, which can effectively reduce the volatilization loss of volatile cargo oil; it has strong self-priming capacity, no additional priming pump is needed, and loading and unloading operations can be started quickly, improving operation efficiency; the low shear force delivery characteristic is suitable for the delivery needs of sensitive chemical cargo oils.

Adaptable to Complex Cargo Transportation Conditions: Designed for different cargo transportation environments such as ocean-going and coastal areas, it can stably adapt to extreme environments with humidity ≤98% and salt spray concentration ≤120mg/m³; it has excellent low-temperature starting performance (can start normally at -30℃), which can meet the cargo transportation needs in polar and frigid sea areas; it has strong high-temperature resistance, can adapt to high-temperature cargo oil delivery conditions below 180℃, and the adaptation range covers most ship cargo transportation scenarios.

Convenient Maintenance and Long Service Life: Stainless steel components are not easy to rust, scale or adhere to cargo oil residues. Daily maintenance only needs to regularly clean the inlet filter screen, check the sealing status and lubricating oil level, without frequent disassembly and maintenance; key components adopt modular design, and wearing parts (seals, bushings, etc.) can be quickly disassembled and replaced, with maintenance time ≤40 minutes; the continuous operation life is 3-4 times that of ordinary steel cargo oil pumps, greatly reducing ship operation and maintenance costs.

Strong Safety and Compliance: Stainless steel has good anti-static and thermal conductivity, which can effectively avoid safety risks caused by static accumulation and local high temperature during cargo oil delivery; it strictly follows the environmental protection requirements of the MARPOL Convention, and the leak-free design can avoid marine environmental pollution by cargo oil; it has passed multiple rigorous tests such as explosion-proof and anti-pollution tests by classification societies, and fully meets the safety and compliance requirements of various cargo ships.

IV. Typical Application Scenarios

4.1 Cargo Oil Loading and Unloading for Ocean-Going Oil Tankers

Ocean-going oil tankers have long cargo transportation distances and large cargo oil tonnages, requiring high reliability, corrosion resistance and delivery efficiency of cargo oil pumps. The marine stainless steel screw cargo oil pump can realize efficient loading and unloading of crude oil, heavy oil and other cargo oils. Its superior corrosion resistance can resist the erosion of sulfur-containing crude oil, and its stable and pulsation-free delivery characteristic can reduce the volatilization loss of cargo oil. It is suitable for the salt spray and vibration environment of ocean-going navigation, ensuring the stable development of long-term continuous loading and unloading operations.

4.2 Chemical Delivery for Chemical Tankers

Chemical cargo oils such as methanol and ethylene glycol transported by chemical tankers have strong corrosion and easy pollution characteristics, requiring strict cleanliness and corrosion resistance of cargo oil pumps. The 316L stainless steel material and perfluoroether seals of the marine stainless steel screw cargo oil pump can realize clean and leak-free delivery of chemical cargo oils, will not chemically react with chemicals, avoid cargo oil pollution, and at the same time, the stable delivery characteristic can protect the quality of sensitive chemicals.

4.3 Auxiliary Fuel Delivery for Liquefied Gas Carriers

Liquefied gas carriers need to deliver auxiliary fuel for the power system, and at the same time face extreme navigation environments of low temperature and high salt spray. The marine stainless steel screw cargo oil pump has excellent low-temperature starting performance and salt spray corrosion resistance, can stably deliver auxiliary fuel, and the intelligent monitoring function can real-time grasp the equipment operation status, ensuring the stable fuel supply and navigation safety of the power system of liquefied gas carriers.

4.4 Multi-Type Cargo Oil Transfer for Multi-Purpose Cargo Ships

Multi-purpose cargo ships often need to transfer different types of cargo oils (diesel oil, fuel oil, lubricating oil, etc.), requiring high adaptability of cargo oil pumps. The marine stainless steel screw cargo oil pump can flexibly adapt to the delivery needs of various cargo oil media. The stainless steel material is easy to clean, and only simple flushing is needed when changing the type of cargo oil, without complex disassembly, greatly improving the cargo transportation flexibility and operation efficiency of multi-purpose cargo ships.

4.5 Cargo Oil Delivery for Coastal Transport Ships and Offshore Oil Storage Platforms

Coastal transport ships and offshore oil storage platforms face extreme environments of strong salt spray and high humidity, and cargo oil delivery needs to take into account both reliability and anti-pollution requirements. The stainless steel protective structure and triple-seal system of the marine stainless steel screw cargo oil pump can effectively resist salt spray erosion and cargo oil leakage, stably realize the loading, unloading and transfer of cargo oil, adapt to complex coastal working conditions, and ensure the safe development of marine cargo transportation and oil storage operations.