Marine Cast Steel Fire Pump

I. Product Overview

Marine cast steel fire pumps are core safety equipment for ship fire protection, designed specifically to handle extreme emergencies such as fires and explosions. Constructed with high-strength carbon cast steel (WCB) or alloy cast steel (WC6), they achieve reliable high-pressure firewater delivery through centrifugal or reciprocating pump principles. Their working principle involves a power source (diesel engine or electric motor) driving an impeller or piston to draw water from overboard or firewater tanks, pressurize it, and deliver it via pipelines to fire monitors, sprinkler systems, or foam mixing units, forming an effective fire-extinguishing range. The pump body undergoes integral forging and explosion-resistant anti-corrosion treatment, operating stably in extreme environments of -30℃~120℃ with impact pressure resistance up to 2.5 times the rated value. It complies with IMO International Code for Fire Safety Systems (FSS Code) and fire certification requirements of classification societies such as LR and ABS, widely used in high-risk scenarios including oil tankers, LNG carriers, ocean-going cargo ships, and offshore platforms.

II. Core Technologies and Material Characteristics

1.Cast Steel Material Selection and Performance

2.Key Technical Parameters

Flow range: 50-500m³/h, suitable for 1,000-100,000-ton vessels

Head: 80-200m, meeting the international standard for fire monitor effective range ≥80 meters

Emergency start-up performance: Diesel-driven start-up time ≤20 seconds, dual power source switching time ≤5 seconds, continuous operation ≥8 hours

Corrosion resistance design: Internal and external surfaces coated with high-temperature resistant epoxy resin (thickness ≥400μm), 2,000-hour salt spray test passed without rust

Explosion-proof rating: Pump body design complies with ATEX 114 explosion-proof standards, safe for operation in Zone 1 hazardous areas

III. Technical Advantages and Innovative Design

1. Reliability in Extreme Conditions

Dual-power redundancy system: Standard diesel engine + electric motor dual-drive mode, automatically switching to diesel power when main power fails, ensuring continuous water supply during fire-induced power outages.

Impact-resistant structure: Pump body with thickened cast steel walls (≥20mm) and reinforced ribs, capable of withstanding explosion shock wave pressure ≥0.8MPa, operating normally when the ship is inclined 30° or rolling ±15°.

2. Efficient Fire-Extinguishing Output

Multi-stage impeller pressurization: 3-5 stage series impeller design, with single-stage head increased to 40-50m and total head up to 200m, meeting vertical water supply needs of high-rise passenger ships or large platforms.

Large instantaneous flow output: Optimized guide vane design enables maximum instantaneous flow up to 1.5 times the rated value, establishing effective fire-extinguishing water pressure within 30 seconds of fire initiation.

3. Long Life and Low Maintenance

Wear-resistant flow components: Impellers and guide vanes made of high-chromium alloy cast steel (Cr26) with hardness up to HRC58, 3x higher wear resistance than ordinary cast steel, service life exceeding 50,000 hours.

Online maintenance design: Split structure of bearing housing and pump body allows seal replacement without disassembling pipelines, reducing single maintenance time to within 2 hours.

IV. Typical Application Scenarios

1. Oil Tankers and Dangerous Goods Vessels

Crude oil tanker fire protection: 300,000-ton VLCCs equipped with two alloy cast steel fire pumps, single pump flow 300-500m³/h, head 150m, cooperating with foam systems to suppress deck oil fires with a fire-extinguishing coverage radius ≥50 meters.

Chemical tanker explosion protection: WC6 alloy cast steel pump bodies with explosion-proof rating Ex d IIB T4, safely handling fires caused by tank area leaks during transportation of flammable and explosive chemicals.

2. Passenger Ships and Large Merchant Ships

Cruise ship multi-deck fire protection: 100,000-ton cruise ships using multi-stage cast steel fire pumps, head 120m, supplying sprinkler water to 15 deck levels via zoned pipelines, with single pump coverage area ≥5,000㎡.

Cargo ship engine room fire suppression: Self-priming cast steel fire pumps with self-priming height ≥8 meters, directly drawing seawater overboard to quickly establish fire-extinguishing water flow in smoky engine room environments.

3. Offshore Platforms and Ports

Drilling platform emergency response: Offshore drilling platforms using diesel-driven cast steel fire pumps, flow 200m³/h, head 180m, meeting high-pressure water supply needs during blowout fires with continuous operation ≥12 hours.

Port fire linkage: Port tugs equipped with mobile cast steel fire pumps, providing emergency fire support to berthed ships via interfaces, flow 100-200m³/h, head 100m.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Ship type: Alloy cast steel (WC6) explosion-proof type for oil tankers/LNG carriers; carbon cast steel (WCB) economical type for ordinary merchant ships

Fire protection requirements: Configure ≥50m³/h flow per 1,000 tons of ship tonnage, e.g., 50,000-ton cargo ships recommend dual-pump parallel systems (total flow ≥500m³/h)

Environmental conditions: Low-temperature start-up type (-30℃ operable) for polar ships; high-temperature heat dissipation type (with water-cooled jacket) for tropical seas

2. Maintenance Key Points

Daily monitoring: Weekly diesel power start-up for 5 minutes, checking oil pressure (≥0.8MPa), water temperature (≤95℃), and leakage

Regular maintenance: Quarterly lubricating oil replacement (API CF-4 grade diesel engine oil), annual pump body water pressure test (1.5x rated pressure)

In-depth maintenance: Disassemble and inspect impeller wear (allowable deviation ≤0.5mm) every 5 years, replace aging seals, and re-spray anti-corrosion coating

VI. Compliance and Certification

International standards: Complies with IMO FSS Code Chapter 10 fire pump requirements and SOLAS Convention Chapter II-2 fire safety specifications

Classification society certifications: Type Approval by LR, ABS, DNV GL, and other institutions for fire-fighting equipment

Explosion-proof certification: Optional ATEX Zone 1/2 or IECEx explosion-proof certification, meeting hazardous area usage requirements