Marine Cast Iron Ejector Cooling Pump

I. Product Overview

The marine cast iron ejector cooling pump is a core key equipment in the ship's power cooling system, specifically designed for the heat dissipation and cooling of key power equipment such as the ship's main engine, auxiliary engine, generator set and hydraulic system. Its core function is to drive the circulation of cooling media (seawater, fresh water) through the ejector pressurization principle, quickly take away the heat generated by equipment operation, ensure that the power system is always within the safe operating temperature range, and avoid equipment failure or performance degradation caused by overheating. This equipment adopts high-quality gray cast iron to manufacture core components such as the pump body, injector, impeller and pump cover, matched with temperature-resistant and corrosion-resistant sealing assemblies and reinforced transmission shafts. It has the characteristics of sturdy structure, impact resistance, high heat dissipation efficiency and cost-effectiveness, and can adapt to complex working conditions such as high humidity, strong salt spray, vibration and cooling media containing a small amount of impurities faced by various ocean-going and coastal ships.

As the "heat dissipation guardian" of the ship's power system, the marine cast iron ejector cooling 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 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) and American Bureau of Shipping (ABS), and is widely used in various ships including 500-100,000-ton ocean-going cargo ships, oil tankers, passenger ships, container ships, coastal fishing boats, inland water transport ships and offshore operation platforms. Compared with stainless steel cooling pumps, cast iron achieves cost optimization through mature casting technology. At the same time, through targeted anti-rust treatment and high-temperature resistant sealing design, it can fully meet the basic operating needs of the ship's cooling system, making it the preferred cooling equipment for small and medium-sized ships and ships sailing under normal conditions, and building a solid "heat dissipation line of defense" for the stable operation of the ship's power system.

II. Core Technical Parameters

Flow Range: 8-400 m³/h, which can be customized in grades according to the power of the ship's power equipment (500-20000kW) and cooling requirements. The flow stability error under rated working conditions is ≤±2.5%, ensuring sufficient circulation of cooling media and stable heat dissipation efficiency.

Pressure Range: 0.3-2.0 MPa, with a maximum working pressure of up to 2.5 MPa and a ejector pressurization efficiency ≥90%. It can meet the pressure requirements of long-distance cooling pipelines and multi-layer equipment cooling circuits, ensuring that the cooling media is accurately delivered to each heat dissipation component.

Medium Compatibility: It can stably transport cooling media (seawater, fresh water, ethylene glycol antifreeze); suitable for medium viscosity range of 1-80 mm²/s, impurity content ≤0.3% (particle size ≤2mm); applicable medium temperature range is -20℃ to 120℃, which can meet the needs of navigation in low-temperature sea areas and high-temperature heat dissipation working conditions (such as heat dissipation during full-load operation of the main engine).

the seals are made of fluororubber (FKM), which have excellent high-temperature resistance and salt corrosion resistance, ensuring no leakage and no corrosion during long-term operation.

Operating Performance: Net Positive Suction Head (NPSH) ≤3.5 m, self-priming height ≥2.5 m, self-priming time ≤35 seconds (at a suction lift of 2m); volumetric efficiency ≥88%, operating noise ≤75 dB(A), vibration acceleration ≤1.0 m/s²; continuous operation life ≥8000 hours, which can meet the heat dissipation needs of 24-hour continuous navigation of the ship.

III. Structural Design and Core Advantages

3.1 Core Structural Design

Integrated Cast Iron ejector Structure: The pump body and injector are formed by integral casting process, without spliced welds, with compact and sturdy structure and excellent impact resistance, which can withstand the during ship navigation and pressure fluctuations of the cooling system; the ejector flow channel is optimized by fluid mechanics design, with high ejector pressurization efficiency, which can quickly increase the flow rate of cooling media and enhance heat dissipation effect.

Reinforced Sealing and High-Temperature Resistant System: Adopts a dual-seal structure of "mechanical seal + O-ring". The sealing surface is made of silicon carbide-graphite composite material, which specifically solves the impact of high-temperature cooling media on sealing performance, with a leakage rate ≤0.005 mL/h; equipped with a cooling sleeve for the seal chamber, which can reduce the working temperature of the seal assembly and extend the service life of the seal.

Anti-Vibration and Anti-Rust Protection Design: The exterior of the pump body adopts a cast iron protective shell, combined with a reinforcing rib structure to improve overall rigidity; the base is made of cast iron and equipped with high-elasticity rubber shock-absorbing pads to effectively buffer operating vibration and avoid resonance with the hull and power equipment; the surface of cast iron components adopts dual treatment of high-temperature anti-rust painting + electrophoretic coating, with excellent salt spray corrosion resistance, suitable for the marine high-humidity and high-salt environment.

3.2 Core Technical Advantages

Efficient and Stable ejector Heat Dissipation: Relying on the optimized ejector flow channel design, the flow rate of cooling media is increased by more than 30%, and the heat dissipation efficiency is 15%-20% higher than that of ordinary centrifugal cooling pumps. It can quickly take away the high-temperature heat of power equipment, ensuring that the equipment is always at a safe operating temperature; the flow output is stable without obvious pulsation, avoiding equipment thermal fatigue caused by fluctuating heat dissipation intensity.

Cost-Effective and Durable: HT200 gray cast iron has easily available raw materials and mature casting technology. Compared with stainless steel cooling pumps, the purchase cost is reduced by 35%-55%, and the price of maintenance parts is low; cast iron has excellent impact resistance and high-temperature resistance, adapting to the high-temperature and vibration working conditions around the ship's power system, with a long service life, greatly reducing the purchase and operation and maintenance costs of ship equipment, and meeting the economic needs of small and medium-sized ships.

Adaptable to Complex Marine Working Conditions: Designed for the characteristics of ship's high salt spray, high humidity and cooling media containing a small amount of impurities, the dual anti-rust treatment can effectively resist seawater erosion, and the corrosion-resistant seals are suitable for various cooling media; it has excellent low-temperature starting performance (can start normally at -20℃), which can meet the navigation needs in polar and frigid sea areas; it has strong high-temperature resistance, and can adapt to the high-temperature heat dissipation working conditions during full-load operation of the main engine.

Convenient Maintenance and Simple Operation: Key components adopt modular design, and wearing parts such as impellers and seals can be quickly disassembled and replaced with simple tools, without professional maintenance skills; daily maintenance only needs to regularly clean the inlet filter screen, check the sealing status and add high-temperature resistant lubricating oil, with a long maintenance cycle (regular maintenance interval ≥4 months), reducing the maintenance workload of the crew.

Safe, Compliant and Widely Adaptable: Strictly follows international and domestic ship safety and power equipment standards, and has passed multiple rigorous tests by classification societies (high-temperature operation test, pressure test, leakage test, vibration test, salt spray corrosion test, etc.); adapts to the power cooling systems of various 500-100,000-ton ships, and can be simply customized according to the power of different power equipment and the layout of cooling circuits, with strong adaptability.

IV. Typical Application Scenarios

4.1 Cooling of Ship Main Engine Cylinder Liner

The ship's main engine is the core of power, and the cylinder liner temperature is extremely high during operation, requiring stable and efficient cooling guarantee. The marine cast iron ejector cooling pump can drive the circulation of 

resh water through ejector pressurization, quickly take away the heat of the cylinder liner, and ensure that the temperature of the main engine cylinder liner is controlled within the safe range of 85-95℃; the impact resistance of cast iron adapts to the vibration environment around the main engine, and the temperature-resistant sealing design can cope with high-temperature cooling media, ensuring the long-term full-load stable operation of the main engine.

4.2 Cooling of Ship Auxiliary Engines and Generator Sets

Auxiliary engines and generator sets are important guarantee equipment for ship navigation and operation, and the stability of heat dissipation directly affects their operational reliability. The marine cast iron ejector cooling pump can accurately match the cooling needs of auxiliary engines and generator sets, stably transport cooling media and achieve efficient heat dissipation; the intelligent temperature control linkage function can automatically adjust the heat dissipation intensity according to changes in equipment load, avoiding energy waste, and at the same time, low-noise operation does not affect the working environment of the ship's engine room.

4.3 Cooling of Ship Hydraulic Systems

Ship hydraulic systems (such as cargo winch and anchor winch hydraulic systems) are prone to generating heat during operation, and high temperature will cause hydraulic oil deterioration and system failure. The marine cast iron ejector cooling pump can quickly circulate and cool the heat dissipation circuit of the hydraulic system, controlling the temperature of hydraulic oil within the optimal range of 40-60℃; the oil-resistant seals have good compatibility with hydraulic oil, avoiding oil leakage and pollution, and ensuring the stable operation of the hydraulic system.

4.4 Power Cooling of Coastal Fishing Boats/Small Operation Ships

Coastal fishing boats and small operation ships have complex navigation environments and limited maintenance conditions, requiring high cost-effectiveness and durability of cooling pumps. The marine cast iron ejector cooling pump is low-cost and easy to maintain, can adapt to the high salt spray and strong vibration environment of coastal areas, and stably provide heat dissipation guarantee for fishing boat main engines and operation equipment; it has strong self-priming capacity, no additional priming is needed, and can be quickly started in emergency situations, reducing the risk of equipment failure.

4.5 Low-Temperature Heat Dissipation of Special Ships (Icebreakers, Scientific Research Vessels)

Icebreakers and scientific research vessels often navigate in low-temperature sea areas such as polar and frigid zones, and the cooling system needs to take into account both low-temperature starting and stable heat dissipation. The marine cast iron ejector cooling pump has excellent low-temperature starting performance and can start normally in an environment of -20℃; the low-temperature resistance and impact resistance of cast iron can adapt to extreme navigation conditions, stably dissipate heat for the power system, and ensure the navigation safety of special ships in extreme environments.