Marine Horizontal Pump
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Horizontal Marine Centrifugal PumpsHeavy-Duty Shipboard Solutions | Back Pull-Out Design | Classification Society Certified FILIPUSI horizontal back pull-out marine pumps deliver reliable shipboard fluid handling for seawater cooling, ballast transfer, HVAC circulation, and general service water. The end-suction structure allows fast rotating element servicing without disconnecting suction or discharge piping, drastically reducing maintenance downtime in vessel engine rooms. Available with wetted components in Nickel-Aluminum Bronze (C95800), Duplex 2205, or Super Duplex 2507 for maximum seawater corrosion resistance. With flows up to 800 m³/h and heads up to 140 meters, the marine horizontal series is the workhorse choice for commercial vessels, offshore platforms, and floating production facilities worldwide. ⚓ Marine Class Compliance: ABS | BV | CCS | DNV | GL | LR | NK | KR | Full Material Test Reports Provided
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Engineered Advantages & Features
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Back-Pull-Out Design Fast rotating element maintenance without unbolting pipeline connections. The complete rotating assembly can be removed in under 2 hours, compared to 6-8 hours for non-back-pull-out designs. |
Rigid Steel Baseplate Heavy base frame absorbs hull vibration and maintains accurate shaft alignment under continuous vessel motion. Pre-aligned at factory, eliminating field alignment issues. |
Marine Metallurgy Ni-Al Bronze (C95800) and Duplex SS resist raw seawater pitting, cavitation erosion, and marine biofouling. Full material traceability with MTR 3.1 certificates. |
CFD Hydraulics Balanced dynamic flow prevents cavitation, extending seal and bearing lifespan by up to 40%. Low vibration operation below 75 dB(A) at 1 meter. |
Operational Principle & Structural Characteristics
Driven by an electric motor at standard marine speeds (1450/2900 rpm at 50Hz / 1750/3500 rpm at 60Hz), the pump shaft spins the dynamic impeller to draw fluid horizontally along the axial suction center. Centrifugal acceleration propels the liquid outward into the volute casing, smoothly converting kinetic velocity into pressurized discharge. The long-coupled design with spacer coupling allows complete rotating assembly removal without disturbing the motor or breaking pipeline flanges, making it ideal for critical shipboard applications where downtime must be minimized.
• Horizontal End-Suction Topology: Straightforward horizontal layout provides stable fluid intake and uniform pressure development across demanding shipboard duty cycles.
• Back Pull-Out Maintenance: Complete rotating assembly (motor, shaft, impeller, mechanical seal) can be extracted without disconnecting suction or discharge piping, reducing maintenance downtime by up to 60%.
• Spacer Coupling Design: Heavy-duty spacer coupling allows mechanical seal replacement through the side gap after unbolting the spacer, without moving the motor or disturbing alignment.
• Rigid Steel Baseplate: Heavy fabricated steel base frame absorbs hull vibration and maintains accurate shaft alignment under continuous vessel motion. Pre-aligned at factory to ISO standards.
• Marine-Grade Mechanical Sealing: Cartridge-type mechanical seals with silicon carbide faces and Viton elastomers designed for continuous seawater duty. Double seal configurations available for hazardous fluids.
• Corrosion-Resistant Metallurgy: Options include Nickel-Aluminum Bronze (C95800), Duplex 2205, Super Duplex 2507, and AISI 316L stainless steel tailored for raw seawater, ballast water, and chemical service.
• Marine-Duty Motor: IP56 protection, Class F/H insulation, and reinforced windings for engine room environments. Explosion-proof (ExdIIBT4) options available for hazardous area zones on offshore platforms.
Sample Hydraulic Curves & Dimensions (DN50 Series)
Note: Sample data for DN50 series. FILIPUSI produces pumps up to DN300+. Contact us for model-specific 2D GA drawings and 3D CAD models.
Fig. 1 - Sample Model: Head & Efficiency Curve (DN50 Series) |
Fig. 2 - GA Dimensional Drawing: Flange Dimensions & Mounting |
Technical Specifications
Standard ratings for FILIPUSI marine horizontal end-suction centrifugal series:
| Parameter | Standard Rating Range | Certificates |
|---|---|---|
| Flow Rate (Q) | Up to 800 m³/h (3,520 GPM) | Custom up to 2,000 m³/h | CCS | ABS | BV | DNV | GL | LR | NK | KR |
| Total Head (H) | Up to 140 m (14 bar) | Custom up to 160m | ISO 9906 Grade 2 Performance Test |
| Motor Power Range | 1.5 kW – 250 kW | IE2/IE3 premium efficiency | CE | IEC 60034 | Explosion-proof ExdIIBT4 |
| Inlet / Outlet Size | DN32 – DN300 | Custom dimensions for retrofitting | JIS | DIN | ANSI Flange Standards |
| Liquid Temperature | Standard ≤ 85°C | High-temp ≤ 120°C | Custom up to 180°C | API 682 Seal Plan Compliance |
| Operating Speed | 1450/2900 rpm (50Hz) | 1750/3500 rpm (60Hz) | VFD-ready | ISO 1940 G6.3 Balancing |
| Structural Metallurgy | Ductile Iron / Cast Steel (standard) | Ni-Al Bronze / Duplex 2205 / Super Duplex 2507 / 316L (optional) | MTR 3.1 Material Test Reports | NACE MR0175 |
| Mechanical Seal | Cartridge type, SiC/SiC faces (standard) | Double seals with Plan 11/21/32 flush (optional) | API 682 | ISO 3069 Seal Dimensions |
| Electrical Drive | 380V/50Hz 3-phase (Standard IP56 Class F) | 440V/60Hz, 415V/50Hz, dual voltage on request | IEC 60034 | IE2/IE3 Efficiency | Marine Duty |
| Pressure Rating (Casing) | PN10 / PN16 (standard) | PN25 / PN40 high-pressure (optional) | 100% Hydrostatic Pressure Tested |
Material Specifications
| Component | Freshwater / Standard Service | Seawater / Heavy-Duty Service |
|---|---|---|
| Pump Casing | Ductile Iron (QT450-10) / Cast Steel | Ni-Al Bronze (C95800) / Duplex SS (2205) |
| Impeller | Cast Iron / Silicon Bronze | Ni-Al Bronze (C95800) / Super Duplex (2507) |
| Pump Shaft | Martensitic SS (2Cr13 / AISI 420) | Duplex SS (UNS S31803) / 316L Stainless Steel |
| Shaft Seal | Mechanical Seal (Carbon/SiC) | Marine Cartridge Seal (SiC/SiC/Viton) |
| Wear Rings | Cast Iron / Bronze | Ni-Al Bronze / Duplex SS |
| Baseplate | Fabricated Steel / Cast Iron | Heavy Fabricated Steel with epoxy marine coating |
Precision Metallurgical Craftsmanship: Bronze & Duplex SS components cast for continuous seawater duty. All wetted components come with material test reports (MTR 3.1) verifying chemical composition and mechanical properties.
Primary Maritime Applications
• Main & Auxiliary Engine Cooling: Continuous seawater/freshwater circulation through central heat exchangers, main engine cooling jackets, and auxiliary machinery. The back pull-out design allows maintenance without disrupting engine room operations. Ni-Al Bronze construction provides reliable 24/7 cooling service with maximum resistance to chloride pitting and marine biofouling.
• HVAC & Chilled Water Loops: Pulse-free chilled water and hot water delivery for shipboard climate control systems aboard passenger vessels, cruise ships, and offshore accommodation modules. The low-vibration design ensures quiet operation in passenger areas. Ductile iron or AISI 316L construction is sufficient for closed-loop freshwater HVAC systems.
• Ballast & Bilge Services: Multi-tank trim balancing, ballast water transfer, deck washdown, and emergency bilge discharge. High-flow models up to 2,000 m³/h enable rapid ballast operations in port, complying with IMO Ballast Water Management Convention requirements. Duplex 2205 construction recommended for BWTS feed service.
• Boiler Feed & Firefighting: High-head boosting for deck fire monitors and auxiliary boiler feed circuits. SOLAS-compliant fire pump configurations available with appropriate pressure ratings and classification society certification. Optional self-priming capability ensures rapid response to fire emergencies.
• Offshore Platform & FPSO Service: Seawater cooling, fire water, and utility service on offshore oil rigs, FPSO units, and offshore wind substations. Super Duplex 2507 construction withstands extreme salinity, structural vibration, and limited maintenance access. Explosion-proof motor options available for hazardous area zones (Zone 1/Zone 2).
• Shipboard General Service Water: Sanitary water supply, deck washdown, laundry and galley water, and general utility water distribution aboard commercial vessels. The horizontal end suction design provides stable pressure and reliable performance across varying demand cycles. VFD control enables energy savings of 30-50% compared to fixed-speed operation.
How to Select the Right Marine Horizontal Pump Model
Selecting the correct marine horizontal end suction pump requires matching five core parameters to your vessel system requirements:
01. Required Flow Rate (Q): Determine the maximum and minimum flow your system demands. The marine horizontal series covers up to 800 m³/h (standard) and up to 2,000 m³/h (customized). Select a pump that operates at 80-110% of its Best Efficiency Point (BEP) at design flow.
02. Total Dynamic Head (TDH): Calculate total head including static elevation, friction loss in piping and heat exchangers, and required terminal pressure. For seawater cooling, account for increased friction due to higher seawater density (1.025 g/cm³) and potential biofouling over time.
03. Fluid Properties & Material: Raw seawater cooling and ballast service = Nickel-Aluminum Bronze (C95800). Ballast water treatment and corrosive service = Duplex 2205 or Super Duplex 2507. Freshwater HVAC loops = Ductile Iron or AISI 316L. For fluids above 85°C, specify high-temperature mechanical seals.
04. Classification Society & Flag State: Specify your vessel's classification society (ABS, BV, CCS, DNV, GL, LR, NK, KR) and flag state at order time so we can provide the correct type approval documentation, material test reports (MTR), and third-party inspection certificates.
05. Installation & Maintenance Requirements: Choose the long-coupled back pull-out design for critical-process applications requiring frequent maintenance access. If you need a drop-in replacement for an existing pump, send us your existing pump dimensions or GA drawing for custom flange-to-flange matching.
Need help selecting? FILIPUSI marine engineers provide free pump selection services. Send us your required flow, head, fluid properties, vessel classification society, and electrical specifications, and we will recommend the optimal model with a full performance curve and dimensional drawing within 24 hours. Contact our marine engineering team »
Quality Control & Testing Procedures
Every FILIPUSI marine horizontal end suction pump undergoes rigorous quality control and testing before shipment to ensure reliable performance in demanding maritime environments:
• 100% Hydrostatic Pressure Testing: All pump casings and pressure-containing components are hydrostatically tested at 1.5x maximum working pressure for a minimum of 10 minutes, with zero leakage acceptable.
• Performance Verification Testing: Each pump is performance-tested on our in-house test bench to verify flow rate, head, efficiency, and NPSHr against the published performance curve. Test reports available upon request.
• Material Traceability: All wetted components come with material test reports (MTR 3.1) verifying chemical composition and mechanical properties. Full traceability from casting to finished pump is maintained.
• Dynamic Shaft Balancing: All rotating assemblies are dynamically balanced to ISO 1940 G6.3 grade to minimize vibration and extend bearing and seal life.
• Shaft Alignment Verification: Each pump-motor assembly is laser-aligned on the baseplate before shipment to ensure precise coupling alignment, eliminating vibration and extending seal life.
• Third-Party Inspection: Classification society surveyor inspection (ABS, BV, CCS, DNV, etc.) available upon request, with full documentation package.
Maintenance & Service Guide
Proper maintenance ensures maximum service life and reliable operation. Recommended maintenance intervals for normal seawater cooling service:
| Maintenance Interval | Recommended Actions |
|---|---|
| Monthly (Every 30 Days) | Inspect for leaks at mechanical seal and flange connections. Check motor bearing temperature (should not exceed 80°C). Monitor vibration levels. Verify pressure gauge readings are within normal operating range. |
| Quarterly (Every 90 Days) | Inspect coupling alignment. Check motor winding insulation resistance. Clean cooling fan and motor ventilation openings. Inspect foundation bolts for tightness. Verify seal flush line is unobstructed (if equipped). |
| Annually (Every 12 Months) | Replace mechanical seal cartridge (or inspect and replace seal faces). Inspect impeller for cavitation damage and corrosion. Check wear ring clearances. Inspect bearings and replace if necessary. Re-align coupling if required. |
| Every 3-5 Years (Overhaul) | Complete overhaul: replace all bearings, mechanical seal, O-rings, and gaskets. Inspect shaft for wear and straightness. Inspect casing for corrosion and erosion. Replace impeller if worn beyond limits. Reassemble, re-align, and full performance test. |
Note: For abrasive or highly corrosive fluid service, reduce all maintenance intervals by 50%. FILIPUSI supplies OEM spare part kits including mechanical seals, bearings, impellers, wear rings, O-rings, and gaskets for all marine horizontal pump models. Request spare parts pricing »
Frequently Asked Questions
Q1: What is the main advantage of the Back-Pull-Out design?
A1: It allows full rotating element removal without unbolting suction or discharge piping, drastically cutting repair downtime. The complete rotating assembly (motor, shaft, impeller, mechanical seal) can be extracted in under 2 hours, compared to 6-8 hours for non-back-pull-out designs. This is critical for shipboard applications where downtime directly impacts vessel operations.
Q2: Are marine class certificates available?
A2: Yes, we provide type approvals and inspection certificates from all major classification societies, including ABS, BV, CCS, DNV, GL, LR, NK, and KR. We provide full type approval documentation, material test reports (MTR), hydrostatic test reports, and third-party inspection certificates as required by the vessel's flag state and classification society.
Q3: What materials are recommended for continuous raw seawater service?
A3: For continuous raw seawater cooling and ballast service, Nickel-Aluminum Bronze (C95800) is the industry standard due to its excellent resistance to chloride pitting, cavitation erosion, and marine biofouling. For more demanding applications such as ballast water treatment feed or corrosive chemical service, we recommend Duplex Stainless Steel 2205 or Super Duplex 2507 for enhanced corrosion resistance.
Q4: Can you provide custom dimensions for vessel retrofitting projects?
A4: Yes. FILIPUSI specializes in custom-engineered marine pumps for vessel retrofitting and fleet modernization. We can manufacture pumps with custom flange-to-flange dimensions, shaft heights, and baseplate mounting patterns to match existing engine room boundaries and legacy flanges, enabling drop-in replacement of aging equipment without pipe modification.
Q5: What is the typical lead time for marine horizontal end suction pumps?
A5: Standard configuration pumps with ductile iron or cast steel construction typically have a lead time of 15-25 working days. Pumps with Bronze or Duplex stainless steel construction require 25-40 working days due to longer casting and machining times. Pumps requiring classification society third-party inspection add 5-10 working days. Custom dimension pumps may require additional time for pattern modification.
Q6: What is the difference between horizontal end suction and vertical inline marine pumps?
A6: Horizontal end suction pumps require a steel baseplate and more floor space, but offer easier maintenance access and can handle higher flow rates (up to 2,000 m³/h). Vertical inline pumps install directly into pipelines like a valve, saving up to 60% floor space, but are typically limited to flows below 1,200 m³/h. Choose horizontal for high-flow, high-maintenance applications; choose vertical for space-constrained engine rooms.
Q7: Do you provide spare parts and after-sales technical support?
A7: Yes. FILIPUSI provides comprehensive after-sales support for all marine horizontal pump models. We maintain an inventory of OEM spare parts including mechanical seal cartridges, bearing sets, impellers, wear rings, shaft sleeves, O-rings, and gaskets. Spare part kits can be shipped within 3-5 working days. Our engineering team provides remote technical support via email, WhatsApp, and video call.
Q8: Can these pumps be used for fire fighting service?
A8: Yes. FILIPUSI marine horizontal end suction pumps can be configured as fire pumps with appropriate pressure ratings and SOLAS certification. We offer both electric motor-driven and diesel engine-driven fire pump configurations. Optional self-priming capability ensures rapid response to fire emergencies. All fire pumps can be supplied with classification society type approval documentation.
Get a Custom Marine Pumping Quote
Contact FILIPUSI for 2D GA drawings, 3D CAD models, material mill certificates, classification society documentation, and direct factory pricing. FILIPUSI delivers tailored OEM/ODM marine pump manufacturing for worldwide shipyards, vessel operators, and offshore contractors.
REQUEST A QUOTE FOR YOUR HORIZONTAL PUMP »Marine Centrifugal Pump Manufacturer & Exporter | www.filipusi.com
Related Marine Pump Series & Categories
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Marine Vertical Centrifugal Pumps Vertical inline design for space-constrained engine rooms. Saves up to 60% floor space. Flows 5-1,200 m³/h. Ideal for seawater cooling and HVAC. |
Marine Double Suction Pumps Axially split case design for very high-flow ballast transfer and seawater circulation. Flows up to 20,000 m³/h. Bronze and Duplex construction. |
Seawater Desalination Pumps High-pressure multistage pumps for SWRO reverse osmosis feed. Pressures up to 80 bar, Super Duplex 2507 construction. Ideal for shipboard freshwater production. |
Other categories: Marine & Shipboard Pumps | Horizontal End Suction Pumps | Vertical Inline Centrifugal Pumps | High-Pressure Multistage Pumps
| Product Number | Product model | Flow | Head | Motor power | Voltage | Frequency(f) | Inlet diameter | Outlet diameter | Material | Mechanical seal sealing | Weight(kg) |
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