Marine Stainless Steel Fire Pump

I. Product Overview

Marine stainless steel fire pumps are key equipment in ship fire safety systems, specifically designed for high-pressure transportation of fire-fighting media such as seawater and freshwater. Constructed with 316 stainless steel (06Cr17Ni12Mo2) or 304 stainless steel (06Cr19Ni10) as the main material, they achieve instantaneous high-pressure output of fire water through centrifugal pump principles. Their working principle involves a power source (electric motor or diesel engine) driving an impeller to rotate at high speed, drawing water from sources (overboard seawater or freshwater tanks), pressurizing it, and delivering it through fire pipelines to fire monitors, sprinklers, or foam systems to form fire-extinguishing water streams or mixed foam solutions. The pump body undergoes integral forging and passivation treatment, with a corrosion-resistant service life of ≥15 years in high-salt spray and high-humidity environments. It meets Chapter 10 of IMO International Code for Fire Safety Systems (FSS Code) and fire equipment certification requirements of classification societies such as LR and ABS, widely used in scenarios with strict corrosion resistance requirements, including passenger ships, chemical tankers, LNG carriers, and offshore platforms.

II. Core Technologies and Material Characteristics

1.Stainless Steel Material Selection and Performance

2.Key Technical Parameters

Flow range: 20-300m³/h, suitable for 500-50,000-ton ships

Head coverage: 50-200m, ensuring an effective range of fire monitors ≥60 meters (high-pressure mode)

Medium compatibility: Capable of transporting seawater (with Cl⁻≤35,000ppm), freshwater, and fire-fighting foam mixtures (concentration ≤6%)

Corrosion resistance design: Internal and external surfaces undergo electrolytic polishing + passivation treatment (film thickness ≥10μm), withstanding 5,000-hour salt spray tests without rust

Temperature adaptability: Wide-temperature operation at -20℃~120℃, capable of withstanding short-term 150℃ high-temperature flue gas baking (fire scenarios)

3.Safety Redundancy Design

Independent diesel engine drive (reserve fuel tank capacity ≥8 hours) + dual electric power sources, ensuring startup even during power outages

Automatic overpressure relief valve (set at 1.1 times the rated pressure) + low water level protection, preventing pipeline bursting and dry-running damage

III. Technical Advantages and Innovative Design

1. Corrosion Resistance in Extreme Environments

All-stainless steel flow path: The pump body, impeller, and guide vanes are all forged from homogeneous stainless steel, avoiding galvanic corrosion caused by contact between dissimilar metals, with no leakage after 10,000 hours of seawater immersion testing.

Impact corrosion resistance structure: The impeller inlet edge adopts a streamlined arc design to reduce cavitation corrosion caused by high-speed seawater impact, with a service life three times that of traditional cast iron pumps.

2. High-Pressure and Efficient Fire-Fighting Performance

Multi-stage impeller series: 3-5 stage impeller design, with single-stage head up to 40m and total head exceeding 200m, capable of penetrating 5mm thick steel plate flame zones to form a cooling barrier, meeting deep fire fighting needs of large ships.

Transient flow enhancement: Guide vanes adopt variable cross-section diversion design, with flow reaching 1.5 times the rated value within 10 seconds of fire initiation to quickly suppress fire spread (traditional pumps require more than 30 seconds).

3. Safety and Maintenance Optimization

Explosion-proof power system: The motor has an explosion-proof rating of Ex d IIB T4, suitable for Zone 1 hazardous areas such as ship engine rooms and fuel tanks, avoiding electric sparks igniting flammable gases.

Non-dismantling maintenance structure: The pump cover and pump body are connected by quick-opening clamps, allowing replacement of mechanical seals without disassembling inlet and outlet pipelines, with single maintenance time ≤1.5 hours, 60% shorter than traditional structures.

IV. Typical Application Scenarios

1. Ships in High-Corrosion Environments

Chemical tanker fire systems: Equipped with 316 stainless steel fire pumps, with flow 100-200m³/h and head 150m, capable of transporting seawater containing trace chemical leaks, operating stably in acidic mist environments with outlet pressure fluctuation ≤±0.2MPa.

LNG carrier low-temperature fire fighting: Low-temperature stainless steel pumps (-40℃ startup) with flow 50-150m³/h are used, cooperating with explosion-proof motors to supply fire water to cargo tank areas, withstanding low-temperature impact after LNG leakage.

2. Passenger Ships and Special Scenarios

Large cruise ship fire networks: 3,000-passenger cruise ships adopt two 316 stainless steel fire pumps in parallel, with single pump flow 200-300m³/h, supplying water to sprinklers on 15 deck levels through annular pipelines, with a response time ≤30 seconds, meeting rapid fire fighting needs in crowded areas.

Polar research vessel fire fighting: Pump bodies with electric heating jackets ensure fire pumps start within 30 seconds in -30℃ environments, with flow 30-80m³/h, providing protection against fire risks during ice-breaking operations.

3. Offshore Platforms and Ports

Drilling platform emergency fire fighting: Platform fire systems are equipped with 316 stainless steel fire pumps, with flow 150-250m³/h and head 200m, capable of supplying water to 8 fire monitors simultaneously to suppress high-temperature flames from well blowout fires.

Port barge fire fighting: 304 stainless steel fire pumps with flow 50-100m³/h are used, providing emergency fire support to berthed ships through quick-connect interfaces, resisting high humidity and high salt spray environments in port areas.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Operating environment: 316 stainless steel for ocean-going/offshore platforms; 304 stainless steel for inland/freshwater areas

Fire fighting needs: Configure ≥15m³/h flow per 1,000m³ of the ship's maximum cabin volume; e.g., 20,000㎡ passenger ships recommend flow ≥300m³/h

Medium characteristics: 316 stainless steel for seawater or chemical-containing media; 304 stainless steel for freshwater; heating jacket models for low-temperature environments

2. Maintenance Points

Daily testing: Conduct 10-minute loaded operation monthly, recording startup time (≤15 seconds) and outlet pressure (≥90% of rated value)

Regular maintenance: Inspect impeller corrosion quarterly (allowable pitting depth ≤0.1mm); replace mechanical seals (made of fluororubber, resistant to seawater aging) every six months

In-depth maintenance: Conduct water pressure tests (1.5 times the rated pressure) every 3 years; passivate the pump body and test stainless steel intergranular corrosion tendency (complying with ASTM A262 standards)

VI. Compliance and Certification

International standards: Complies with Chapter 10 of IMO FSS Code and SOLAS Convention Regulation II-2/10.1.2 for fire pumps

Classification society certifications: Passed type approval for fire pumps by LR, ABS, CCS, and other institutions (including corrosion resistance testing of 316 stainless steel)

Explosion-proof certification: Ex d IIC T4 Gb explosion-proof rating, meeting ATEX 114 requirements for hazardous areas on ships