Marine Cast Steel General Pump

I. Product Overview

Marine cast steel General pumps are "versatile workhorses" in ship fluid transportation systems, designed to meet the needs of conveying various media such as fresh water, seawater, fuel oil, and sewage. Constructed with high-strength carbon cast steel (WCB) or alloy cast steel (WC6), they achieve efficient cross-scenario fluid transportation through centrifugal pump principles. Their working principle involves a power source (electric motor or diesel engine) driving an impeller to rotate, generating centrifugal force to draw media from storage tanks or containers, pressurize it, and distribute it via pipelines to various ship systems (e.g., cooling, cleaning, emergency transportation), adapting to the variable fluid handling needs in ship operations. The pump body undergoes integral forging and multi-media anti-corrosion treatment, with a corrosion-resistant service life of ≥12 years in fresh water, seawater, fuel oil, and low-concentration sewage. It meets the IMO International Safety Management Code (ISM Code) and general equipment certification requirements of classification societies such as LR and ABS, widely used in general fluid transportation scenarios for cargo ships, passenger ships, oil tankers, and engineering vessels.

II. Core Technologies and Material Characteristics

1.Cast Steel Material Selection and Performance

2.Key Technical Parameters

Flow range: 10-300m³/h, suitable for diverse transportation needs of 500-50,000-ton ships

Head coverage: 10-80m, meeting full-ship transportation heights from low-level cabins to upper decks

Medium compatibility: Capable of conveying fresh water, seawater (with Cl⁻≤35,000ppm), light fuel oil (viscosity ≤500cSt), and low-concentration sewage (solid content ≤5%)

Corrosion resistance design: Inner walls adopt composite anti-corrosion coating (epoxy + ceramic particles), withstanding 1,500 hours of salt spray and 10,000 hours of oil immersion without damage

Temperature adaptability: Wide-temperature operation at -20℃~120℃; high-temperature models can temporarily withstand 150℃ media (e.g., emergency transportation of hot oil)

3.Safe and Universal Design

Shaft seal adopts a "mechanical seal + lip seal" dual-protection structure, automatically adapting to seal pressure for different media, with leakage ≤3mL/h

Equipped with a multi-functional protection module, supporting automatic shutdown for overload, dry operation, and overpressure (1.2 times the rated pressure), adapting to multi-scenario safety needs

III. Technical Advantages and Innovative Design

1. Multi-Media Adaptability

Variable flow channel impeller: Uses replaceable impeller bushings (rubber/ceramic/metal materials) for quick switching according to media characteristics — replacing with wear-resistant ceramic bushings for sewage transportation and oil-resistant rubber bushings for fuel oil transportation, with switching time ≤30 minutes.

Anti-deposition structure: Flow channels adopt bionic design (simulating fish streamline) to reduce media retention in the pump, with residual volume ≤0.5L after conveying solid-containing sewage, lowering cleaning costs.

2. Full-Ship Scenario Adaptability

Modular drive interface: The pump shaft output end reserves dual drive interfaces for electric motors and diesel engines, allowing flexible switching according to ship power configurations (e.g., motor drive in engine rooms, diesel engine drive in emergency scenarios), with 100% installation adaptability.

Extreme condition resistance design: The pump body and base adopt elastic supports, with a vibration value ≤3.5mm/s, ensuring stable operation under ship heel of 30°, trim of 15°, and short-term impact loads, meeting harsh sea conditions and emergency working conditions.

3. High Efficiency, Energy Saving, and Low Maintenance

Wide efficient range: Optimized impeller and volute matching through CFD, achieving efficiency ≥80% in the 60%-120% rated flow range, saving 15%-20% energy compared to ordinary general-purpose pumps (especially suitable for scenarios with large flow fluctuations).

Non-dismantling maintenance structure: The bearing box and pump body adopt a split design, allowing replacement of seals and bearings without disassembling pipelines, with single maintenance time ≤1.5 hours, 60% shorter than traditional structures.

IV. Typical Application Scenarios

1. Routine Operation Scenarios

Deck general transportation: Cargo ships are equipped with WCB carbon cast steel general-purpose pumps, with a flow rate of 50-100m³/h and a head of 20m, providing seawater for deck flushing and fresh water for living quarters, achieving "one pump with dual purposes" through valve switching.

Engine room auxiliary transportation: Oil tanker engine rooms use WC6 alloy cast steel pumps, with a flow rate of 30-80m³/h and a pressure of 2.5MPa, handling both fuel oil tank bottom oil transfer and cooling system water replenishment, adapting to alternating multi-media transportation needs.

2. Emergency Handling Scenarios

Cabin emergency drainage: Passenger ships are equipped with self-priming cast steel general-purpose pumps, with a self-priming height ≥6m and a flow rate of 100-200m³/h, quickly pumping water in case of accidental water ingress in cargo holds, cooperating with check valves to prevent backflow.

Fuel oil emergency transfer: When the main fuel pump fails, the general-purpose pump can switch to fuel oil mode, realizing emergency transportation of heavy oil (viscosity ≤1000cSt) within 30 minutes through oil-resistant seal modification, ensuring fuel supply to the main engine.

3. Special Vessel Adaptation

Engineering ship miscellaneous transportation: Dredgers use wear-resistant general-purpose pumps, with a flow rate of 150-300m³/h, capable of conveying river water with sand content ≤5% for mud tank flushing and equipment cooling, with an impeller service life exceeding 8,000 hours.

Polar ship low-temperature transportation: Polar research ship general-purpose pumps adopt heating jacket designs, starting within 30 seconds in -30℃ environments, capable of conveying low-temperature fresh water and extracting overboard seawater (anti-freezing treatment), meeting the shared needs of multiple systems.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Media type: WC6 alloy cast steel type for seawater/fuel oil/sewage transportation; WCB carbon cast steel type for clean water/low-impurity media transportation

Flow matching: Configure according to "maximum single-scenario flow ×1.2"; for example, if deck flushing requires 80m³/h and emergency drainage requires 120m³/h, a flow rate ≥150m³/h is recommended

Environmental conditions: High-temperature resistant type (≥150℃) for high-temperature scenarios (e.g., near boilers); -30℃ start-up type for cold zones; enhanced shock absorption type for high-vibration areas

2. Maintenance Key Points

Daily monitoring: Check outlet pressure (fluctuation ≤±0.1MPa), bearing temperature (≤75℃), and media leakage every 600 hours

Regular maintenance: Replace lubricating oil quarterly according to the type of conveyed media (oil-resistant type for fuel systems, rust-proof type for water systems); clean impellers and flow channels every six months (especially after conveying sewage)

In-depth maintenance: Conduct a water pressure test (1.5 times the rated pressure) every 5 years, inspect impeller wear (allowable deviation ≤1mm), and re-spray anti-corrosion coating

VI. Compliance and Certification

International standards: Complies with IMO ISM Code and ISO 13709 ship general-purpose pump design specifications

Classification society certifications: Passed general machinery type approval (including multi-media performance tests) by LR, ABS, CCS, and other institutions

Environmental requirements: Pump body materials are 100% recyclable, coatings contain no heavy metals, meeting the environmental requirements of IMO MARPOL Annex V