Engine Room Parts
Pumps & Fluid Transfer
Cooling, bilge, ballast, and transfer pumps for superyachts and commercial vessels
Request QuoteMission-Critical Fluid Systems
From seawater cooling pumps to emergency bilge systems, marine pumps are essential to vessel safety and operation. Mercer Yachting sources OEM-specification pumps, rebuild kits, impellers, and mechanical seals for all major marine applications. We support rapid procurement of critical spares with technical expertise to keep your fleet operational 24/7.
What We Supply
Cooling Pumps
Raw water intake, fresh water circulation, and heat exchanger pumps for main and auxiliary engines
Bilge Pumps
Centrifugal and emergency bilge systems, submersible units, and oily water separator feed pumps
Ballast & Transfer Pumps
Ballast discharge, fuel transfer, and ballast water management pumps meeting BWMS standards
Dosing & Metering Pumps
Fuel treatment additive injection, oil mist eliminator feed, and chemical metering systems
Diaphragm & Piston Pumps
Hydraulic drive and manually operated pumps for emergency deck operations
Impellers & Rebuild Kits
Complete pump overhaul packages, impeller castings, and mechanical seal assemblies
How to Specify
Provide These Details
- Pump make, model, and serial number
- Fluid media (seawater, fresh water, fuel, hydraulic, coolant)
- Flow rate requirement (m3/h or GPM)
- Required head or pressure (bar or PSI)
- Motor voltage, frequency, and horsepower
- Material specifications (bronze, stainless, cast iron)
- Connection size (flanged or threaded)
- ATEX or other certification if required
Common RFQs We Handle
Jabsco Raw Water Pump Rebuild Kit
Complete overhaul package with impeller, seals, and gaskets
Bilge Pump 24V Bronze
Emergency bilge submersible pump for superyacht auxiliary systems
Caterpillar Cooling Pump CAT C32
OEM marine diesel engine jacket water circulation pump
Mechanical Seal Assembly Pump
Carbon/ceramic mechanical seal for leakage-free operation
Ballast Water Transfer Pump
IMO BWMS compliant ballast management centrifugal pump
Fuel Transfer Pump 110V AC
Marine fuel oil transfer system pump with strainer
Diaphragm Pump Manual Hydraulic
Emergency hand-operated pump for critical flush operations
Oil Mist Eliminator Feed Pump
Dosing pump for marine diesel crankcase ventilation systems
Raw Water Impeller NBR
Seawater pump impeller for engine cooling circulation
Hydraulic Deck Pump Submersible
Submersible centrifugal pump for hydraulic reservoir drainage
Sewage & Black Water Pump
Macerating pump for marine sanitation system
Auxiliary Generator Cooling Pump
Fresh water cooling circulation pump for diesel genset
High-Pressure Fire Pump 380V
Emergency fire fighting system centrifugal pump
Thermal Oil Circulation Pump
Heat transfer fluid circulation for engine jacket heating
Pump Drive Coupling Flexible
Motor-to-pump coupling for vibration isolation and misalignment tolerance
Frequently Asked Questions
What is the typical lifespan of a marine pump impeller?
Impeller life depends on water quality and operating conditions. In clean seawater, a raw water pump impeller typically lasts 1,000-2,000 operating hours. Contaminated water, sand, or extended dry-running dramatically reduces life. Regular inspection is recommended.
Why do mechanical seals fail and how can they be prevented?
Mechanical seal failure results from thermal cycling, cavitation, or contamination. Prevention includes proper cooling, adequate suction head, sealed bearing housings, and regular seal inspection. OEM specification parts ensure compatibility and reliability.
What is the difference between centrifugal and diaphragm pumps?
Centrifugal pumps use a rotating impeller for high flow at lower pressures—ideal for cooling and bilge. Diaphragm pumps are positive displacement units that work at high pressure with minimal flow—suitable for emergency or metering applications.
Can raw water pumps be operated dry temporarily?
No. Dry-running a seawater pump for more than a few seconds will damage the impeller and mechanical seal due to lack of cooling and lubrication. Always ensure seawater is flowing before starting operation.
What does "flow rate" mean and why is it critical to specify?
Flow rate (m3/h or GPM) is the volume of fluid the pump must move per unit time. Undersizing causes inadequate cooling or bilge capacity; oversizing wastes energy. Always match the pump to the system requirement from your engine or equipment manual.
What is pump "head" and how does it relate to pressure?
Head is the vertical height a pump can lift fluid (expressed in meters). It directly correlates to pressure: 1 meter of head equals approximately 0.1 bar. System designers specify both flow and head to ensure the pump has sufficient power.
How do I know if a pump seal is failing?
Watch for visible weeping around the pump shaft, unusual noise, vibration, or unexplained fluid loss. Early detection allows planned maintenance before complete failure, which could halt critical cooling or bilge operations.
What is cavitation and how does it damage pumps?
Cavitation occurs when suction pressure drops below vapor pressure, creating vapor bubbles that implode and erode pump components. Prevention includes adequate suction head, clean suction strainers, and avoiding long suction lines. Listen for a crackling noise—that signals cavitation.
Delivery Footprint
Mercer Yachting delivers across the Mediterranean — Malta, Antibes, Palma de Mallorca, Barcelona, Genoa, Athens, Split — and worldwide via our global logistics network. Emergency parts dispatched same-day from our Malta hub.
Ready to Source Pumps?
Our engine room specialists can source OEM pumps, rebuild kits, and mechanical seals for any vessel type. Contact us with your pump specifications for immediate quotation and availability.