Marine Stainless Steel Centrifugal Fire Pump

I. Product Overview

The marine stainless steel centrifugal fire pump is a core safety equipment specially designed for ship fire protection systems, adopting the centrifugal working principle. Relying on the high-speed rotation of the impeller to generate centrifugal force, it rapidly converts mechanical energy into fluid pressure energy, realizing the efficient and stable delivery of fire-fighting water or fire-extinguishing medium. Key components such as the pump body, impeller and pump shaft are made of high-quality stainless steel materials (316L/duplex stainless steel), which have excellent corrosion resistance, high-temperature resistance and mechanical strength. They can effectively resist the erosion of seawater, salt spray and harsh marine atmospheric environment, ensuring long-term reliable operation under extreme marine working conditions.

As the core power source of the ship's fire protection system, this pump is mainly used for fire fighting in various areas such as ship cargo holds, engine rooms, cabins and offshore platforms. When necessary, it can also be used as an emergency water supply pump for other key systems. The product complies with international standards such as the International Maritime Organization's Fire Test Procedures Code (IMO FTP Code), International Convention for the Safety of Life at Sea (SOLAS Convention), ISO 14520 Marine Fire Pump Standard, as well as national standards such as GB/T 32146 Marine Centrifugal Fire Pump. It has obtained type approval from mainstream classification societies including China Classification Society (CCS), Lloyd's Register (LR), American Bureau of Shipping (ABS) and Det Norske Veritas (DNV), and is widely applicable to various ships such as cargo ships, oil tankers, passenger ships, container ships, offshore drilling platforms and ocean-going research vessels.

II. Core Technical Parameters

Flow Range: 50-500 m³/h, graded and configured according to ship tonnage and fire protection area requirements. The flow stability error under rated working conditions is ≤±3%, ensuring sufficient fire-extinguishing water supply.

Head Range: 50-200 m, which can meet the fire protection water supply requirements of different ship heights and pipeline resistances. The maximum working pressure can reach 2.5 MPa, realizing long-distance and high-altitude fire fighting.

Medium Adaptability: Mainly used for fresh water, seawater and fire-fighting foam mixture. It can withstand slight impurities with solid content ≤0.5% (particle size ≤0.5 mm). The applicable medium temperature range is -10℃ to 120℃, adapting to the temperature changes of ship fire scenes.

Rotation Speed: 1450 r/min or 2900 r/min, matching marine standard motors (protection level IP55). It supports direct diesel engine drive or motor drive, with a start-up response time ≤30 seconds, meeting emergency fire protection needs.

Efficiency: The hydraulic efficiency under rated working conditions is ≥82%, and the total efficiency is ≥78%, which is energy-saving and environmentally friendly, and can reduce the energy consumption of the ship's power system during fire fighting operations.

Suction Performance: The net positive suction head (NPSH) is ≤3.5 m, with strong self-priming capacity. The self-priming time under a suction lift of 6 m is ≤60 seconds, ensuring rapid water absorption and start-up in emergency situations.

III. Structural Design and Safety Protection

3.1 Structural Features

Stainless Steel Integrated Design: The pump body and impeller are integrally cast with 316L stainless steel, with smooth internal flow channels, which reduce hydraulic loss and improve water delivery efficiency; the pump shaft is made of duplex stainless steel, with high torsional strength and wear resistance, ensuring stable high-speed operation.

Optimized Sealing System: Adopts a double mechanical seal structure (silicon carbide-silicon nitride mating surface + O-ring seal), with a leakage rate ≤0.01 mL/h. It is equipped with a seal cooling and flushing system to prevent seal failure caused by high temperature during fire fighting operations.

Compact Installation Structure: Supports horizontal or vertical installation methods, adapting to the limited space of ship cabins; the base is equipped with shock-absorbing pads, which can reduce vibration and noise during operation, and the noise under rated working conditions is ≤75 dB(A).

3.2 Safety Protection Functions

Overpressure Protection: Equipped with a pressure relief valve and a pressure sensor. When the system pressure exceeds 1.1 times the rated pressure, the pressure relief valve automatically opens to release pressure, and the sensor sends an alarm signal to the ship's central control system to avoid damage to the pipeline or pump body.

Overload and Overheating Protection: The supporting motor is equipped with an overload protector and a temperature sensor. When the motor is overloaded or the temperature exceeds 155℃, it automatically shuts down and alarms to prevent motor burnout.

Dry Running Protection: A liquid level sensor is installed in the suction pipeline. If the pump runs dry due to insufficient suction liquid, it immediately stops working and sends an alarm to avoid impeller damage caused by dry friction.

Explosion-Proof Performance: The electrical control part adopts Ex d IIB T4 Gb explosion-proof grade, which is suitable for ship Zone 1/2 hazardous areas (such as engine rooms, oil cargo holds, etc.), ensuring safe operation in flammable and explosive environments.

IV. Technical Advantages

4.1 Excellent Corrosion and Wear Resistance

The 316L and duplex stainless steel materials used in the pump body have excellent resistance to pitting corrosion, crevice corrosion and stress corrosion. No rust or corrosion occurs in the 2000-hour salt spray test; after 10,000 hours of continuous operation test with seawater as the medium, there is no obvious wear on the impeller and pump body. The service life is more than twice that of ordinary carbon steel fire pumps, which greatly reduces the maintenance cost and replacement frequency of ship equipment.

4.2 Efficient and Rapid Fire Response

Adopting optimized hydraulic design, the pump body has high head and large flow rate, which can quickly establish a stable fire-fighting water column. The start-up response time is less than 30 seconds, which can effectively shorten the initial fire extinguishing time and improve the fire extinguishing success rate; the stable flow output ensures that the fire-extinguishing medium can fully cover the fire scene, avoiding the spread of fire due to insufficient water supply.

4.3 Reliable Operation Under Extreme Working Conditions

The pump body adopts a high-strength structural design, which can withstand ship heeling ±35°, trimming ±25° and vibration acceleration of 15g, ensuring stable operation under harsh sea conditions such as storms and huge waves; it can work continuously for more than 24 hours without failure under rated working conditions, meeting the long-term fire extinguishing needs of large ship fires.

4.4 Convenient Maintenance and High Versatility

The key components of the pump body (impeller, mechanical seal, bearing, etc.) adopt a modular design, which can be disassembled and replaced from the front end without disassembling the entire pipeline and motor. The maintenance time is ≤45 minutes, improving maintenance efficiency; the spare parts of different models have a high generalization rate (≥90%), reducing the pressure of ship spare parts inventory.