Marine Stainless Steel General Pump

I. Product Overview

Marine stainless steel General pumps are "all-rounders" in ship fluid conveying systems, designed specifically for versatile transportation of seawater, freshwater, low-concentration chemicals, lubricating oil, and other media. Constructed with 316L ultra-low carbon stainless steel (022Cr17Ni12Mo2) or 304 stainless steel (06Cr19Ni10) as the main material, they achieve efficient cross-scenario fluid delivery through centrifugal or self-priming pump principles. Their working principle involves a power source (electric motor or diesel engine) driving an impeller to rotate, generating pressure differentials to draw media from storage tanks, pressurize it, and distribute it via pipelines to target equipment (e.g., cooling systems, cleaning devices, temporary conveying pipelines), adapting to multiple working condition switching needs. The pump body undergoes integral forging and passivation treatment, with a corrosion-resistant service life of ≥15 years in salt spray, humid, and weakly corrosive environments. It meets IMO General Equipment Specifications for Ship Machinery and General pump certification requirements of classification societies such as LR and ABS, widely used in cargo ships, passenger ships, drilling platforms, and other scenarios requiring multi-functional fluid conveying.

II. Core Technologies and Material Characteristics

1.Stainless Steel Material Selection and Performance

2.Key Technical Parameters

Flow range: 5-200m³/h, suitable for ships of 500-50,000 gross tons (e.g., 10,000 gross ton ships recommend flow ≥30m³/h)

Head coverage: 8-50m, meeting multi-level conveying needs from bilge to deck equipment

Medium compatibility: Capable of conveying seawater (Cl⁻≤35,000ppm), freshwater, engine oil (viscosity ≤300cSt), weak alkalis (pH≤10), dilute acids (pH≥3), and slurries with solid content ≤1%

Self-priming capacity: Self-priming models achieve self-priming height ≥6m and priming time ≤60 seconds, requiring no pre-priming devices

Temperature adaptability: Wide-temperature operation from -20℃ to 120℃; 316L material withstands short-term high-temperature media (e.g., hot oil) up to 150℃

3.Generalized Design Features

Pump inlets and outlets use standardized flanges (DN50-DN200) for quick pipeline connection switching, adapting to different media conveying needs

Drive ends reserve multiple interfaces, supporting electric motor, diesel engine, or hydraulic motor drive to meet various ship power source scenarios

III. Technical Advantages and Innovative Design

1. Cross-Medium Conveying Capacity

Corrosion-resistant flow channel optimization: Flow-through components are forged from homogeneous stainless steel to avoid galvanic corrosion from contact between dissimilar metals. 316L material shows no pitting after 10,000-hour immersion in 5% saltwater, enabling alternating conveying of seawater and freshwater without rust risks.

Anti-clogging impeller: Open impeller design with streamlined flow channels allows passage of solid particles ≤3mm in diameter, reducing clogging rates by 80% in media containing trace impurities (e.g., estuarine seawater).

2. Multi-Functional Scenario Adaptability

Modular structure: Pump covers and bases adopt detachable designs, enabling impeller replacement (from freshwater to wear-resistant types) within 30 minutes to adapt to rapid switching of media from freshwater to sandy seawater.

Dual-mode operation: Centrifugal pump mode (efficiency ≥85%) for long-distance conveying of low-viscosity media; self-priming mode for emergency pumping (e.g., bilge water), with switching requiring no mechanical adjustments.

3. Reliability in Extreme Environments

Anti-vibration design: Pump units and bases use spring shock absorbers with vibration values ≤3.5mm/s, ensuring normal operation at ship heel ±20° and trim ±10° to meet harsh sea condition requirements.

Explosion-proof and protection: Motors have IP56 protection ratings; explosion-proof types (Ex d IIB T4) are suitable for hazardous areas such as engine rooms, while non-explosion-proof types are used in safe areas like decks, configured as needed.

IV. Typical Application Scenarios

1. Conventional Fluid Conveying

Freshwater/seawater transfer: 316L stainless steel General pumps (flow 50-100m³/h, head 20m) transfer freshwater or ballast seawater between supply ships and mother ships, with quick connectors enabling pipeline connection completion within 30 minutes.

Equipment cleaning: 304 stainless steel self-priming pumps (flow 10-30m³/h) are used for deck washing and anchor chain cleaning, capable of drawing overboard seawater and pressurizing it for spraying, cooperating with rotating nozzles to improve cleaning efficiency.

2. Auxiliary System Support

Emergency cooling: When main cooling pumps fail, 316L General pumps (flow 20-50m³/h) are quickly connected to generator cooling systems to convey seawater for temporary cooling, with stable outlet pressure at 0.8±0.1MPa to prevent equipment overheating.

Lubricating oil conveying: Serve as backup pumps to convey lubricating oil (viscosity 100cSt) to gearboxes, with flow 5-15m³/h and head 30m, used with filters to meet equipment lubrication needs.

3. Emergency and Special Tasks

Leaked medium recovery: Chemical tankers are equipped with 316L General pumps (flow 15-40m³/h) to collect trace leaked alkaline chemicals (pH 9) and convey them to treatment tanks via corrosion-resistant pipelines to prevent pollution.

Polar research support: 316L pumps with heating jackets in -30℃ environments can convey -10℃ seawater (flow 20-50m³/h) to provide water flow for icebreaker bow sprinkler systems, preventing icing.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Medium type: 316L stainless steel for seawater and weakly corrosive media; 304 stainless steel for freshwater and clean media

Flow requirements: Configure 1.2 times the maximum hourly conveying volume; e.g., 500m³ daily seawater transfer requires pump flow ≥25m³/h

Scenario characteristics: Self-priming types for emergency pumping; centrifugal types for long-distance conveying; explosion-proof types for hazardous areas

2. Maintenance Points

Daily inspection: Monitor outlet pressure (fluctuation ≤±0.2MPa), bearing temperature (≤75℃), and seal leakage (≤3mL/h) every 800 hours

Regular maintenance: Clean filters every six months; replace mechanical seals (fluororubber materials for 316L pumps) annually; inspect impeller wear (allowable deviation ≤0.3mm)

Seasonal maintenance: Clean heat dissipation channels before entering tropical seas; inspect heating jacket insulation (resistance ≥1MΩ) before polar navigation

VI. Compliance and Certification

International standards: Complies with ISO 9906 centrifugal pump performance standards and IMO MSC.1/Circ.1475 general equipment guidelines

Classification society certifications: Passed type approval for General pumps by LR, ABS, and CCS (including 316L material corrosion resistance testing)

Environmental requirements: 100% recyclable flow-through components; leakage collection devices meet MEPC.107(49) anti-pollution specifications