Marine Centrifugal Emergency Fire Pump

I. Product Overview

Marine centrifugal emergency fire pumps are the "last line of defense" for ship fire safety, designed specifically for emergency fire fighting when the main fire-fighting system fails or the main power supply is cut off by a fire. They can independently deliver seawater, freshwater, and low-concentration foam solutions to provide high-pressure fire-fighting water flow for critical areas (engine room, cargo hold, bridge). Constructed with stainless steel (316L) or bronze alloy (ZCuAl9Fe4Ni4Mn2) as the main material, they generate pressure through high-speed rotation of centrifugal impellers to draw water from independent emergency water sources (such as overboard seawater or dedicated emergency water tanks), pressurize it, and deliver it directly to the fire site via emergency pipelines. The pump body undergoes explosion-proof treatment and corrosion resistance enhancement, enabling stable startup in extreme environments of -30℃~70℃, with a seawater corrosion resistance life of ≥10 years. It meets the requirements of IMO International Code for Fire Safety Systems (Chapter 10 of FSS Code) and emergency fire-fighting equipment certification from classification societies such as RS, LR, ABS, and CCS. As a mandatory emergency equipment for ships over 500 gross tons, it is widely used in high-risk or personnel-intensive ships such as oil tankers, chemical tankers, and passenger ships.

II. Core Technologies and Material Characteristics

1.Material Selection and Performance

2.Key Technical Parameters

Flow range: 15-100m³/h, suitable for ships of 500-30,000 gross tons (e.g., 10,000 gross ton ships require flow ≥30m³/h)

Head coverage: 80-150m, ensuring emergency fire monitor range ≥30 meters (covering 80% of the ship's maximum longitudinal distance)

Medium compatibility: Capable of conveying seawater (sediment content ≤2%), freshwater, 3% foam mixture, and fire-fighting media with temperature ≤60℃

Emergency startup performance: Response time from cold state to rated pressure ≤30 seconds; supports manual/automatic dual startup modes; can be driven by an emergency diesel engine during power failure

Independent operation capability: Equipped with a self-contained fuel tank (fuel reserve ≥3 hours of continuous operation), completely isolated from the main power grid to avoid power chain failure caused by fire

3.Safety Protection Design

Explosion-proof certification: Motor adopts Ex d IIB T4 Gb explosion-proof grade, capable of safe startup when oil and gas concentration reaches 50% of the lower explosive limit

Overload protection: When outlet pressure exceeds 1.3 times the rated value, the pressure relief valve automatically opens to prevent explosion of emergency pipelines due to high-temperature deformation

Dry-running protection: Automatically shuts down within 10 seconds of dry running; the gap between impeller and pump casing ≤0.1mm to avoid metal friction sparks when there is no medium

III. Technical Advantages and Innovative Design

1. Ultra-fast Emergency Response

Dual-impeller pressurization: Adopts a series dual-impeller design with single-stage head ≥60m and total head up to 150m, establishing the 1.6MPa pressure required for fire fighting within 30 seconds, which is 50% faster than single-stage pumps.

Low-temperature startup system: Integrates an electric heating jacket (5kW power) and battery startup device (120Ah capacity), enabling startup after 5 minutes of preheating in -30℃ environments, suitable for winter emergencies on polar ships.

2. Adaptability to Extreme Environments

Anti-capsizing structure: The pump unit base adopts four-point elastic damping, enabling stable water absorption when the ship heels ±25° and trims ±15°, ensuring the last fire-fighting window before the ship sinks.

High-temperature resistance design: The pump body is wrapped with a heat insulation layer (temperature resistance 200℃); when the ambient temperature at the fire site reaches 150℃, the internal components' temperature ≤80℃, ensuring trouble-free operation for 1 hour continuously.

3. Adaptability to Emergency Systems

Quick-connect interface: The inlet and outlet adopt DN65-DN150 standard emergency fire flanges, equipped with quick-locking devices, allowing manual connection within ≤2 minutes, suitable for temporarily laid fire hoses.

Low-noise operation: The impeller is optimized through fluid dynamics, with an operating noise ≤85dB (measured at 1 meter), avoiding interference with command communication during emergency startup.

IV. Typical Application Scenarios

1. Emergency Response to Main Fire System Failure

Engine room fire and power failure: When a fire breaks out in the oil tanker engine room due to a short circuit and cuts off the main power supply, the bronze alloy emergency fire pump (flow 50-80m³/h, head 120m) automatically starts via the diesel engine, spraying high-pressure water onto the fire source through pre-embedded pipeline in the bulkhead within 30 seconds, cooling the fuel pipeline and controlling the spread of the fire.

Main pump pipeline burned out: When the main fire pipeline is burned out in a container ship cargo hold fire, the stainless steel emergency fire pump (flow 30-50m³/h) draws water independently from overboard, connects to the fire monitor through temporary hoses on the deck, with a range ≥40 meters, covering the burning area and protecting adjacent cargo holds.

2. Fire Fighting in Special Areas

Passenger ship escape routes: When the main passage is blocked due to a fire in the passenger cabin of a passenger ship, the emergency fire pump (flow 20-30m³/h) drives the sprinkler system to form a water curtain barrier (water pressure 0.8MPa) in the escape route, delaying the spread of the fire to the lifeboat embarkation area.

Chemical leakage fire: When a low-intensity fire breaks out due to cargo hold leakage on a chemical tanker, the 316L stainless steel emergency pump delivers seawater to the explosion-proof fire monitor with a flow of 40-60m³/h, cooling and diluting the leakage concentration to a safe level.

3. Emergency Response in Extreme Working Conditions

Fire fighting before ship sinking: When the ship tilts 15° after a collision, the emergency fire pump can still draw water from the low-level overboard, maintaining 80% of the rated flow, buying 15-20 minutes of golden time for crew evacuation.

Polar low-temperature rescue: When sailing in ice areas at -25℃, the emergency pump with preheating function starts within 5 minutes, delivering seawater with antifreeze (freezing point -15℃) to prevent fire fighting interruption caused by pipeline freezing.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Ship type: Stainless steel pumps are suitable for oil tankers and chemical tankers; bronze alloy pumps are suitable for passenger ships and high-vibration environments

Flow calculation: Configure according to 1.5 times the volume of the ship's largest cabin per hour; for example, a 5000m³ cargo hold requires a flow ≥75m³/h

Emergency level: "Critical area coverage" required by Chapter II-2 of the SOLAS Convention requires a head ≥100m, and ordinary areas require ≥80m

2. Maintenance Points

Daily testing: Conduct a 5-minute no-load startup every two weeks, and a 30-minute pressurized operation every month (outlet pressure ≥90% of the rated value)

Regular maintenance: Replace the mechanical seal (fluororubber material) every 6 months; inspect impeller wear (allowable radial clearance ≤0.2mm) and clean the inlet filter (aperture 3mm) every year

Emergency drill: Simulate main power failure every quarter, test the diesel engine startup time (≤15 seconds) and the stability of continuous operation for 3 hours

3. Special Maintenance

Explosion-proof component inspection: Verify the explosion-proof performance by a third-party testing agency every 2 years to ensure the junction box sealing grade ≥IP66

Low-temperature performance calibration: Test the -30℃ startup performance of polar ships before each voyage, with the heating jacket power attenuation ≤10%

VI. Compliance and Certification

International standards: Complies with "Emergency Fire Pump Performance Requirements" in Chapter 10 of IMO FSS Code and emergency system regulations in Chapter II-2 of the SOLAS Convention

Classification society certification: Obtained "emergency fire pump type approval" from RS, LR, ABS, and CCS (including 1500-hour extreme working condition test)

Mandatory requirements: Must meet the three core indicators of "startup within 30 seconds", "3-hour independent operation", and "100m minimum head", and have no power or pipeline connection with the main fire system