Marine Stainless Steel Emergency Fire Pump

I. Product Overview

Marine stainless steel emergency fire pumps serve as the "last line of safety defense" in shipboard emergency fire scenarios, specifically designed for emergency fire fighting when the main fire-fighting system fails. They utilize 316L ultra-low carbon stainless steel (022Cr17Ni12Mo2) or 304 stainless steel (06Cr19Ni10) as core materials, achieving rapid start-up and high-pressure delivery without pre-priming through self-priming centrifugal pump principles. Their working principle involves an independent diesel engine driving an impeller to rotate at high speed (rotational speed ≥1500r/min), using a self-priming structure to create a vacuum within 30 seconds, drawing water from overboard or emergency freshwater tanks, pressurizing it, and delivering it through dedicated emergency fire-fighting pipelines to fire-fighting terminals across the ship, buying critical time for fire control. The pump body undergoes ultra-precision polishing and passivation treatment, with a corrosion-resistant service life of ≥20 years in high-salt spray and high-humidity environments. It meets Chapter 13 "Emergency Fire Pumps" of IMO International Code for Fire Safety Systems (FSS Code) and emergency equipment certification requirements of classification societies such as LR and ABS, and is mandatory for passenger ships, oil tankers, chemical tankers, and all ships over 500 gross tons.

II. Core Technologies and Material Characteristics

1.Stainless Steel Material Selection and Performance

2.Key Technical Parameters

Flow range: 15-150m³/h, meeting emergency fire coverage needs of ships of different tonnages (500-20,000 gross tons)

Head requirement: ≥120m under rated conditions, ensuring the farthest fire monitor has a range of ≥40 meters (minimum standard for emergency scenarios

Self-priming performance: Self-priming height ≥6m, priming time ≤30 seconds (interval from start-up to fire water discharge), no manual priming required

Medium compatibility: Capable of transporting seawater (Cl⁻≤35,000ppm), freshwater, and foam additive mixtures (concentration ≤3%)

Environmental adaptability: Wide-temperature start-up from -30℃ to 80℃, capable of normal operation when the ship heels 22.5° or trims 10°

3.Emergency Safety Design

Independent power supply: Equipped with single-cylinder or multi-cylinder diesel engines (reserve fuel for ≥12 hours of continuous operation), completely isolated from the main power grid to ensure independent start-up during power outages

Multiple protection mechanisms: Features automatic shutdown functions for overspeed (1.2 times rated speed), overpressure (1.1 times rated pressure), and low oil level, with fault response time ≤2 seconds

Explosion-proof rating: Diesel engine exhaust systems are equipped with spark arrestors; motors (if configured) have an explosion-proof rating of Ex d IIB T3, suitable for Zone 2 hazardous areas

III. Technical Advantages and Innovative Design

1. Ultra-Fast Emergency Response Capability

Dual-impeller self-priming structure: Adopts a "main impeller + inducer" composite design, where the inducer pre-forms negative pressure, reducing self-priming time by 40% compared to traditional single-impeller pumps, establishing stable head within 30 seconds (IMO requires ≤5 minutes).

Hot-standby start system: The diesel engine remains in a "preheated standby" state (automatic heating when ambient temperature <5℃), with start-up response time ≤5 seconds (traditional cold start requires over 30 seconds), meeting the timeliness requirements of emergency scenarios.

2. Reliability in Extreme Environments

Enhanced corrosion resistance: 316L stainless steel pump bodies undergo solution treatment (1050℃ quenching) to eliminate stress, with a surface corrosion rate ≤0.01mm/year after 10,000 hours of salt spray testing, far exceeding the 0.05mm/year standard of ordinary stainless steel.

Vibration and impact resistance: Pump units and bases use rubber-spring composite shock absorbers, with vibration acceleration ≤10g, capable of withstanding short-term impacts from ship collisions or explosions, ensuring no damage to core components.

3. Lightweight and Operational Convenience

Compact design: Adopts a horizontal single-stage structure, reducing floor space by 30% compared to traditional emergency fire pumps, and can be installed in narrow ship cabins (minimum installation space ≥1.5m×1.2m).

One-button operation: Equipped with waterproof emergency start buttons (IP67 protection), supporting both remote (bridge) and local start-up, simplifying the start-up process to a "single button press" without requiring professional personnel.

IV. Typical Application Scenarios

1. Emergency Response to Main Fire System Failure

Oil tanker engine room fires: When the main fire pump fails due to high temperatures, 316L stainless steel emergency fire pumps start within 10 seconds, with a flow rate of 50-100m³/h and head of 150m, spraying fire water into the engine room through high-temperature resistant pipelines to suppress fires caused by fuel leaks.

Fires in passenger ship public areas: Cruise ship emergency fire pumps use 304 stainless steel, with a flow rate of 30-60m³/h, covering 1000㎡ cabin areas within 2 minutes in conjunction with sprinkler systems, buying time for personnel evacuation while preventing freshwater corrosion of pipelines.

2. Emergency Fire Fighting in Special Environments

Chemical tanker leakage fires: 316L emergency fire pumps transport weakly acidic seawater (pH 5-6) with a flow rate of 80-150m³/h, operating continuously in corrosive mist with stable outlet pressure at 2.5±0.1MPa, cooperating with foam systems to extinguish chemical combustion flames.

Polar ship low-temperature emergencies: In -40℃ environments, pump bodies use dual insulation of fuel preheating and electric tracing to ensure start-up within 30 seconds, with a flow rate of 20-50m³/h, providing fire-fighting water for hull fires during ice-breaking operations and preventing low-temperature cracking.

3. Life-Saving and Evacuation Assistance

Fire control before abandon ship: Before emergency abandon ship, emergency fire pumps can be remotely started to spray continuously at 50% rated flow, delaying fire spread to lifeboat release areas and ensuring safe evacuation routes.

Emergency support during port calls: When the main fire system of a berthed ship is under maintenance, emergency fire pumps can be used as temporary main pumps, providing fire water support to adjacent ships through quick-connect interfaces with flow matching ≥80%.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Ship tonnage: 15-50m³/h for 500-3000 gross tons; 50-150m³/h for 3000-20,000 gross tons (must meet IMO's minimum standard of "≥0.1m³/h per 100 gross tons")

Navigation area: 316L stainless steel is mandatory for ocean-going and chemical tankers; 304 stainless steel is optional for inland and coastal ordinary ships

Installation conditions: Rainproof type (IP56) for outdoor engine room installation; explosion-proof type (Ex d IIB T3) for indoor engine room installation

2. Maintenance Points

Weekly testing: Conduct 5-minute no-load start-ups weekly, recording start-up time (≤5 seconds) and idle speed stability (fluctuation ≤±50r/min)

Monthly maintenance: Inspect fuel filters monthly (impurity content ≤0.1g/L) and self-priming valve tightness (pressure drop ≤0.05MPa/30min)

Annual inspection: Conduct 1-hour loaded operation tests annually (outlet pressure ≥90% of rated value), and perform passivation repair on stainless steel surfaces (complying with ASTM A967 standards)

Emergency drills: Participate in full-ship fire drills quarterly, simulating main system failure scenarios to verify the linkage response capability of emergency pumps

VI. Compliance and Certification

International standards: Complies with IMO FSS Code Chapter 13, SOLAS Convention Regulation II-2/4.3, and MSC.1/Circ.1318 emergency pump performance standards

Classification society certifications: Passed type approval for emergency fire pumps by LR, ABS, and CCS (including 12-hour continuous operation tests)

Mandatory requirements: At least 1 unit is required for ships over 500 gross tons; passenger ships require "one in use, one standby" dual units; diesel engine start-up success rate ≥99%