Stainless Steel Centrifugal Emergency Fire Pump

I. Product Overview

Stainless steel centrifugal emergency fire pumps are designed based on centrifugal fluid transportation principles, using austenitic stainless steel (304/316) or duplex stainless steel. They provide emergency high-pressure water sources for fire emergency scenarios (such as fire power outages and municipal water supply interruptions). The stainless steel material system, combined with emergency start-up technology, integrates corrosion resistance, rapid response, and continuous water supply reliability, enabling stable operation in media such as fire water with impurities and seawater. It meets the strict requirements for emergency equipment in GB50974-2014 Technical Code for Fire Water Supply and Hydrant Systems.

II. Core Materials and Characteristics

1.Austenitic Stainless Steel (316/316L)

Characteristics: Contains 2-3% molybdenum, tensile strength ≥520MPa, outstanding chloride ion corrosion resistance (corrosion rate <0.005mm/year in seawater with Cl⁻ concentration 20000ppm), good weldability, and maintains stable mechanical properties in 120℃ high-temperature fire water.

Applications: Manufactures core components such as pump bodies and impellers, suitable for emergency fire protection systems in coastal areas and fire scenarios with foam extinguishing agents resisting  corrosion with pH4-10

2.Duplex Stainless Steel (2205)

Characteristics: Ferritic-austenitic duplex structure, tensile strength ≥620MPa, impact toughness 30% higher than 316 stainless steel, excellent cavitation resistance (can withstand 300MPa bubble collapse impact), and stress cracking under high pressure (≥1.6MPa).

Applications: Used for impellers and pump shafts of emergency fire pumps in high-rise buildings, resisting cavitation damage during high-pressure water transportation to ensure stable emergency water supply.

III. Emergency Technical Advantages

1. Rapid Start-Up and Dual-Power Guarantee

Equipped with diesel engine/battery dual-power start-up systems, automatically switching during power outages with a start-up time ≤30 seconds (complying with GB50974 requirements). Diesel power can operate continuously for ≥3 hours to meet initial fire emergency water supply needs.

The hydraulic efficiency of duplex stainless steel impellers under 1.6MPa pressure reaches 88%-92%, 15%-20% higher than cast iron emergency pumps, ensuring stable fire hose range (deviation ≤5%).

2. Corrosion Resistance and Long-Life Standby Performance

The passivation film on the 316 stainless steel surface has strong self-healing ability, requiring no additional anti-corrosion maintenance during long-term idling (standby state ≥6 months). Maintenance costs are 60% lower than cast iron emergency pumps (cast iron requires regular anti-rust treatment, increasing costs by 20%-30%).

Service life in conventional fire protection systems exceeds 20 years, 2.5 times that of cast iron emergency pumps (5-8 years), reducing equipment failure risks during emergencies.

3. Highly Reliable Structural Design

Adopts double-screw mechanical seals with leakage ≤5 drops/minute, combined with a pressure sensor automatic monitoring system to provide real-time feedback on pump operation status, ensuring "zero leakage" during emergencies.

The pump body has good rigidity, with vibration amplitude ≤0.03mm, avoiding component loosening caused by vibration, suitable for installation in shaking environments (e.g., fire boats, mobile fire trucks).

IV. Emergency Application Scenarios

1. Building Fire Emergency Water Supply

Suitable for emergency fire protection systems in high-rise buildings and commercial complexes. When municipal power supply is interrupted, 316 stainless steel emergency pumps can be started by batteries, providing a water source with ≥0.8MPa pressure for fire hydrant systems (e.g., emergency fire pump groups in 30-story office buildings).

2. Industrial Accident Emergency Rescue

Used for emergency fire protection in petrochemical enterprises and oil depots. Duplex stainless steel pumps can transport alcohol-resistant foam extinguishing agents under high pressure (≤2.5MPa), resisting fluoride corrosion in the agents, such as emergency sprinkler systems in storage tank areas.

3. Natural Disaster Emergency Scenarios

316 stainless steel emergency pumps equipped in coastal areas or ships resist seawater corrosion, providing stable fire water sources during disasters like typhoons and tsunamis, such as emergency fire boat pump groups in port terminals.

V. Emergency Precautions

1. Standby State Maintenance

Conduct no-load start-up tests monthly (run for 10 minutes) to ensure normal diesel engine/battery status and no corrosion on stainless steel components (especially check sealing surfaces of 316 material in humid environments).

Keep the emergency pump cavity dry to avoid long-term water accumulation causing scale on stainless steel surfaces (regular pickling required when Ca²+ concentration in hard water >200ppm).

2. Working Condition Limitations

316 stainless steel pumps are prone to pitting corrosion in media with Cl⁻ concentration >30000ppm; 2205 duplex steel (resistant to Cl⁻ concentration ≤50000ppm) should be selected.

When the working pressure of duplex stainless steel pumps >1.6MPa, the water temperature should be ≤120℃ to avoid material strength decline caused by high pressure and temperature.

3. Certification and Compliance

Products must pass CCCF fire protection certification, comply with GB6245-2006 Fire Pumps standards, and emergency start-up performance must be tested by the National Fire Equipment Quality Supervision and Inspection Center.