Smart motor control · Seawater pump & ER fan VFD retrofit

Variable speed. Measurable savings.

Variable-frequency drives that run seawater cooling pumps and engine-room ventilation fans at the speed the ship actually needs, less electrical load, less fuel, longer machinery life.

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20–50%pump & fan power at partial load

Shortpayback period

Pump & fan VFD upgrade

A retrofit that matches motor speed to demand.

The VFD Energy Saving System replaces constant-speed operation of the seawater cooling pumps and the engine-room (ER) ventilation fans with intelligent frequency control. Vessels gain measurable fuel savings, a lower electrical load and a longer machinery life, while improving CII performance and overall energy efficiency.

Applicable to bulk carriers, tankers, container vessels, LNG carriers and other ocean-going ships.

Why it saves

From constant speed to actual demand.

Conventional seawater pumps and ER fans run at full speed whatever the engine load, sea water or engine-room temperature. The VFD system changes that.

The challenge

Constant-speed pumps and fans, regardless of engine load or ambient temperature, result in:

Excess electrical usage
Unnecessary generator loading
Increased fuel oil consumption
Accelerated pump and fan wear
Higher emissions

The solution

The VFD system regulates pump and fan speed based on:

Main engine load
Sea water temperature
Engine-room temperature
Cooling system pressure feedback
Operational mode

By matching pump and fan performance to actual demand, the system cuts excess power consumption while keeping cooling and engine-room ventilation safe and stable.

Compliance contribution

Savings that count towards your ratings.

The VFD upgrade contributes to:

EEXI compliance marginCII improvementEU ETS exposure reductionFuelEU Maritime preparationIMO DCS / EU MRV

Up to 50%

reduced pump and fan load

Smart pumps & fans

What you get on board.

Typical fuel savings depend on vessel type and trading profile; the payback is short, depending on vessel profile and fuel price.

Key benefits

Reduction of auxiliary power consumption
Lower fuel oil consumption
Improved CII rating
Reduced generator running hours
Extended pump, fan and motor lifetime
Reduced maintenance costs
Short return on investment

Technical features

Frequency inverter cabinet (marine type)
Integrated control logic for pumps and ER fans
Automatic and manual operation modes
Remote monitoring capability
Protection and alarm system
Compatible with the existing cooling and ventilation systems
Minimal structural modification; optional link to your performance monitoring platform

Turn-key package

One partner, from study to verified savings.

The retrofit can be done during drydock or a scheduled port stay.

Pre-installation engineering study

Electrical load analysis

Class approval documentation

Equipment supply

Installation supervision

Commissioning

Post-installation performance verification

Let’s evaluate your fleet.

We are happy to receive your inquiries about seawater pump and ER fan VFD evaluation studies of your existing and newbuild fleet. If you are interested in other energy efficiency solutions, our engineering team can scope a wide range of options.

Request a study +30 210 429 2939 energy@mastms.gr

preliminary evaluation

Last years CII Rating performance
Improvement according to each solution
Energy Saving Device proposal
Detailed case vessel evaluation