Marine Cast Steel Emergency Fire Pump

I. Product Overview

Marine cast steel emergency fire pumps serve as the "last line of defense" for ship fire emergency response, designed specifically for emergency fire suppression in extreme dangerous situations. Constructed with high-strength alloy cast steel (WC6/WC9) or carbon cast steel (WCB) as core materials, they achieve instantaneous high-pressure output of firewater through the principle of high-pressure centrifugal pumps. Their working principle involves an independent power source (diesel engine) driving an impeller to rotate at high speed, drawing seawater or freshwater from emergency water sources and pressurizing it to ultra-high pressure, then delivering it to fire monitors or sprinkler systems via dedicated pipelines. This ensures an effective fire-extinguishing barrier even when the main fire system fails. The pump body undergoes integral forging and explosion-resistant anti-corrosion treatment, capable of short-term operation in high-temperature open-flame environments of -40℃~150℃, with impact pressure resistance up to 3 times the rated value. It meets the "Special Requirements for Emergency Fire Pumps" in Chapter 10.2 of IMO International Code for Fire Safety Systems (FSS Code) and strict certifications from classification societies such as LR and ABS, widely used in high-risk ships (oil tankers, LNG carriers, ro-ro passenger ships) and offshore platforms.

II. Core Technologies and Material Characteristics

1.Cast Steel Material Selection and Performance

2.Key Technical Parameters

Flow range: 30-200m³/h, suitable for 500-50,000-ton vessels

Head: 100-300m, ensuring effective range of fire monitors ≥100 meters (high-pressure mode)

Emergency response: Diesel power start-up time ≤15 seconds, full-load operation ≤30 seconds, continuous output ≥4 hours

Explosion resistance: Pump body design complies with ATEX 114 Zone 0 explosion-proof standards, withstanding 1.0MPa explosion shock waves

Temperature limit: Short-term (30 minutes) resistance to 150℃ high-temperature media, long-term operating temperature -40℃~80℃

3.Safety Redundancy Design

Independent fuel tank (capacity ≥8 hours of supply) + manual start device, ensuring operability during power outages or communication interruptions

Automatic overpressure relief valve (set at 1.1 times the rated pressure) to prevent pipeline bursting

III. Technical Advantages and Innovative Design

1. Extreme Environment Survival Capability

Flameproof power cabin: Diesel engine integrated with explosion-proof enclosure, flame propagation class ≤AⅡA, eliminating ignition risks in oil-gas leakage environments.

Anti-capsizing operation: Adopts omnidirectional suction design, capable of drawing water when the ship heels 35° or trims 20°, meeting emergency fire suppression needs before sinking.

2. Instantaneous High-Pressure Output

Ultra-high-pressure impeller set: 5-7 stage series impeller design, with single-stage head up to 50m and total head exceeding 300m, capable of penetrating 3mm thick steel plate flame zones to form a cooling barrier.

Flow surge technology: Guide vanes with variable cross-section design, enabling flow to reach 2 times the rated value within 10 seconds of fire initiation, quickly suppressing fire spread.

3. Emergency Reliability Assurance

Maintenance-free sealing system: Uses metal bellows mechanical seal (material: Inconel 625), with leak-free operation cycle ≥8,000 hours, requiring no daily maintenance.

Self-diagnosis and alarm: Integrates vibration, temperature, and pressure sensors for real-time fault monitoring and audible-visual alarm, supporting linkage with ship fire alarm systems.

IV. Typical Application Scenarios

1. Emergency Response for High-Risk Ships

LNG carrier cargo tank fire: Equipped with WC9 alloy cast steel emergency fire pumps, head 250m, flow 150m³/h, spraying water on the outer wall of cargo tanks through insulated pipelines to control wall temperature ≤300℃.

Oil tanker deck oil spill fire: Emergency fire pumps on 300,000-ton VLCC can start within 15 seconds after main system failure, cooperating with foam monitors to form a 50-meter radius fire-extinguishing zone, suppressing crude oil re-ignition.

2. Passenger Ships and Special Scenarios

Ro-ro passenger ship vehicle cabin fire: Uses self-priming cast steel emergency pumps with self-priming height ≥9m, flow 80-120m³/h, injecting high-pressure water mist into enclosed cabins through penetrating sprinklers for suffocation fire suppression.

Polar research vessel anti-freeze start-up: Equipped with fuel preheating systems in -40℃ environments, ensuring pump start-up within 30 seconds to provide fire-extinguishing water for fires caused by ice zone collisions.

3. Offshore Platforms and Ports

Drilling platform blowout fire: Diesel-driven emergency fire pumps with flow 200m³/h and head 300m, continuously spraying water on blowout preventers for cooling, cooperating with well-killing operations to control risks.

Port emergency rescue: Tugs equipped with mobile cast steel emergency pumps, providing emergency support to berthed ships via quick-connect interfaces, establishing fire-extinguishing water flow within 10 minutes.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Hazard level: WC6 alloy cast steel explosion-proof type for explosive hazard zones (oil tankers, LNG carriers); WCB carbon cast steel type for ordinary areas

Flow matching: Configure ≥10m³/h flow per 1,000m³ of the ship’s maximum cabin volume; e.g., 20,000㎡ passenger ships recommend flow ≥200m³/h

Environmental limits: -40℃ start-up type for cold zones; heat-insulated pump bodies for high-temperature areas

2. Maintenance Key Points

Daily testing: Monthly 15-minute loaded operation, recording start-up time (≤15 seconds) and outlet pressure (fluctuation ≤±0.2MPa)

Regular inspection: Quarterly replacement of diesel filters; annual calibration of fuel tank level sensors and relief valves

Emergency drills: Semi-annual linkage tests with ship fire alarm systems, ensuring full process from pump start-up to fire monitor water discharge is completed within 1 minute

VI. Compliance and Certification

International standards: Complies with IMO FSS Code Chapter 10.2 and SOLAS Convention II-2/4.3.3 requirements for emergency fire pumps

Classification society certifications: Type approval for emergency equipment by LR, ABS, DNV GL (including -40℃ low-temperature start-up tests)

Explosion-proof certification: Ex d IIC T4 Gb explosion-proof grade, meeting ATEX 114 and IECEx requirements for Zone 0 hazardous areas