Marine Centrifugal Fire Pump

I. Product Overview

Marine centrifugal fire pumps are the core power equipment of ship fire-fighting systems, designed specifically for ship fire suppression. They can quickly deliver seawater, freshwater, and foam mixtures to provide high-pressure water flow for fire monitors and sprinkler systems. Constructed with cast iron (HT250) or stainless steel (316L) as the main material, they generate pressure through high-speed rotation of centrifugal impellers to draw water sources (overboard seawater or fire water tanks), pressurize it, and deliver it to fire sites via pipelines. The pump body undergoes pressure testing and anti-corrosion treatment, operating stably in -20℃~60℃ environments with a seawater corrosion resistance life of ≥8 years. It meets IMO International Code for Fire Safety Systems (FSS Code) and fire equipment certification requirements of classification societies such as RS, LR, ABS, and CCS. As a mandatory equipment for ships over 500 gross tons, it is widely used in fire-fighting systems of cargo ships, oil tankers, passenger ships, container ships, and other vessel types.

II. Core Technologies and Material Characteristics

1.Material Selection and Application Scenarios

2.Key Technical Parameters

Flow range: 20-200m³/h, suitable for ships of 500-50,000 gross tons (e.g., 10,000-gross-ton ships require flow ≥50m³/h)

Head requirement: ≥120m under rated conditions, ensuring fire monitors have a maximum range ≥45 meters (covering the largest cabin span)

Pressure control: Outlet pressure 1.0-2.5MPa, stable pressure via pressure regulating valves to meet requirements of different fire equipment (e.g., 0.8MPa for sprinklers, 1.6MPa for fire monitors)

Medium compatibility: Capable of conveying seawater, freshwater, 6% concentration foam, cooling water with sediment content ≤1%, and short-term oily sewage (oil content ≤3%)

Self-priming performance: Self-priming height ≥6m, priming time ≤30 seconds (meeting IMO "immediate start" standards) without external priming devices

3.Safety Design Specifications

Equipped with dual power sources: Main power supply (380V/220V) + emergency diesel engine (fuel reserve ≥3 hours) to ensure startup even when the main power grid fails

Integrated overpressure protection: Automatically relieves pressure when outlet pressure exceeds 1.2 times the rated value to prevent pipeline bursting

Dry-running protection: Automatically shuts down within 5 seconds of dry running to avoid impeller damage from lack of medium lubrication

III. Technical Advantages and Innovative Design

1. Efficient Fire Suppression Performance

Two-stage impeller pressurization: Uses series two-stage impeller design with single-stage head ≥60m and total head up to 150m, establishing rated pressure within 30 seconds — 40% faster than single-stage pumps in fire response.

Wide flow regulation: Supports stepless flow adjustment in 30%-110% rated range, switching between sprinkler (low flow) and fire monitor (high flow) modes based on fire size, achieving 15% energy savings.

2. Extreme Environment Adaptability

Vibration-resistant structure: Pump units and bases use rubber shock absorbers + spring composite damping with vibration ≤3.0mm/s, ensuring stable operation in high-vibration main engine room environments.

Low-temperature startup protection: Low-temperature pumps (-20℃) are equipped with preheating devices, enabling startup within 3 minutes in extremely cold environments, suitable for polar research vessels and other special ships.

3. Fire System Compatibility

Foam-compatible design: Flow channels optimized for anti-foam breakdown, with foam collapse rate ≤5% when conveying 6% foam (vs. 15% for ordinary centrifugal pumps), ensuring stable fire-extinguishing concentration.

Quick-connect interfaces: Inlet/outlet adopt international standard fire flanges (DN80-DN200) for rapid connection to ship fire pipelines, reducing installation time.

IV. Typical Application Scenarios

1. Routine Fire Suppression

Cargo hold fires: During container ship cargo hold fires, stainless steel centrifugal fire pumps (flow 100-150m³/h, head 120m) supply water to in-cabin sprinkler systems via fire pipelines, cooperating with foam generators to cover burning areas and control fire spread within 10 minutes.

Engine room fires: When oil tanker engine rooms catch fire due to oil leaks, dual-power centrifugal fire pumps (diesel-driven) start within 30 seconds with flow 80-100m³/h, targeting fire sources via high-pressure monitors (range ≥50 meters) to cool high-temperature equipment and isolate oxygen.

2. Emergency Fire Linkage

Main fire system failure: When main fire pumps fail due to high temperatures, backup centrifugal fire pumps (flow 50-80m³/h) automatically start, supplying water to critical areas like bridges and passenger cabins via independent pipelines to ensure safe emergency escape routes.

During dock berthing: When ships berth at docks, centrifugal fire pumps can connect to shore-based fire systems as backup power sources, ensuring fire safety for personnel and cargo during loading/unloading.

3. Special Ship Adaptation

Oil tanker explosion-proof design: Oil tanker centrifugal fire pumps use explosion-proof motors (Ex d IIB T4) with flow 150-200m³/h, operating safely in flammable and explosive environments to prevent secondary explosions from sparks.

Passenger ship crowded areas: Passenger ship fire systems use low-noise centrifugal fire pumps (operating noise ≤85dB) with flow 60-100m³/h, minimizing disturbance to passengers during fire suppression.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Ship tonnage: 20-50m³/h for 500-3000 gross tons; 50-200m³/h for 3000-50,000 gross tons

Navigation area: Cast iron pumps for inland/coastal waters; stainless steel pumps for ocean-going/high-salinity seas

Power type: Dual power (main electricity + diesel) recommended for passenger ships and oil tankers; single power (main electricity) optional for cargo ships

2. Daily Maintenance Points

Regular testing: Start once weekly (5-minute operation); full-load operation for 30 minutes monthly; record outlet pressure (≥90% of rated value)

Maintenance cycles: Replace lubricating oil every 6 months; inspect impeller wear annually (allowable radial clearance ≤0.3mm) and replace mechanical seals

Emergency drills: Conduct simulated main power failure startups quarterly, ensuring diesel engines reach rated head within 30 seconds

3. Compliance Inspection

Pass classification society inspection every 2 years, focusing on self-priming performance (≤30 seconds) and diesel engine continuous operation capability (3-hour trouble-free run)

VI. Compliance and Certification

International standards: Complies with Chapter 14 of IMO FSS Code and SOLAS Convention requirements for emergency fire pumps

Classification society certifications: Obtained "fire pump type approval" from RS, LR, ABS, and CCS (including 1000-hour durability tests)

Performance requirements: Must meet three core indicators — "startup within 30 seconds," "3-hour continuous operation," and "120m minimum head"