Cut Cooling Pump Energy by up to 80%
The PES system controls SW and FW cooling pumps based on actual vessel operating conditions — reducing fuel consumption, maintenance costs and CO₂ emissions with a short return on investment.
80%
Max. energy saving by smart pump control
| Annual fuel savings | ~€110k / vessel |
| CO₂ reduction | ~240 t / year |
| Vessels equipped | 6,500+ |
| Years of experience | 55+ |
| AMS interface | Modbus RTU |
What the PES System Does
Most vessels run their cooling pumps at fixed speed — regardless of actual engine load, sea temperature or system demand. PES changes that. It continuously adapts pump speed to real operating conditions, shutting off unnecessary consumers and cascading pumps automatically.
The result: dramatically lower energy use without any compromise on cooling performance or safety. The system works standalone with AMS interface via Modbus RTU, covers both the SW and FW circuits, and can be integrated into existing BESI RCV installations.
Suitable for new builds and retrofit alike — every system is fully tested at Behrens Pumpen’s test facility in Bremen before delivery.
| Control principle | Variable Speed Drives (VSD) |
| AMS interface | Modbus RTU and/or digital outputs |
| Panel ingress protection | IP54, wall mounting |
| Power supply | 440 VAC / 220 VAC |
| Operation | Touch screen, multi-station capable |
| System pressure control | Available OPTIONAL |
| Installation type | Retrofit-ready, existing vessels |
| Commissioning | Full-scale test at Behrens Pumpen, Bremen |
01
Smart Pump Control
- Variable Speed Drives on all pumps
- Automatic cascading of pumps
- Pump selection by running hours
- Shut-off of unused consumers (FW)
02
Single-Screen Operation
- All relevant parameters on one page
- Easy handling
- In accordance with cyber security rules
03
Failsafe by Design
- Automatic switchover to stand-by pump
- 100% pump operation on sensor failure
- Full manual override as back-up
04
Engine Room Ready
- Wall-mount panels, IP54 rated
- Operable from multiple stations
- 440 VAC / 220 VAC power supply
05
Built for Your Vessel
- Configured for SW and FW cooling circuits
- Retrofit-ready for existing installations
- Full-scale test before delivery
06
System Pressure Control
- Prevents cavitation at cooler outlet
- Active pump protection under all loads
Built on Research
A research partnership with the Institute of Automation (IAT) at the University of Bremen and funding from the European Union are not handed out lightly. PES earned both on the strength of the energy savings it makes possible.
The Numbers Speak for Themselves
Calculated for a sample vessel: MPC with MCR = 4,800 kW, three 550 kW auxiliary engines, SW pumps 3 × 50% at 23 kW each @ 50 Hz.
SW Pump Control — 82% Energy Saved
Cooler outlet temperature control with frequency-controlled pumps and automatic shut-off reduces average pump power from 46 kW (two pumps at 50%) to 8.3 kW.
121 t CO₂ equals the annual heating emissions of up to 60 German households.
FW Optimisation — 49% Energy Saved
Hydraulic check and flow adjustment alone reduce average pump power from 75 kW to 37 kW — without major hardware changes or dry dock time.
Nearly 50% savings from hydraulic optimisation alone — before frequency control is even applied.
Combined SW and FW savings on a single vessel: ~€110,000 in fuel costs per year and ~240 tonnes of CO₂ reduced annually — with lower maintenance costs and extended pump service life on top.
€ 110k
per vessel / year
Find Out What PES Saves on Your Fleet
Our engineers will review your current cooling system configuration and calculate the individual savings potential for your vessel type — at no cost and without commitment.
No commitment. Response within one business day.
Or write to us directly: PES Systems
Two Companies. One Shared Expertise.
Heinrich Behrens Pumpenfabrik GmbH & Co. has been engineering marine pumps in Bremen since 1921 — over 100 years of specialisation in cooling water, ballast, fire-fighting and general service pumps for vessels worldwide.
Every PES system is commissioned and fully tested at Behrens Pumpen’s in-house test facility in Bremen, where original sea conditions are simulated. Spare parts are available within 24 hours from stock — in every major port, on every ocean.
- 100+ years of marine pump engineering
- Full-scale test facility in Bremen
- Pumps for cooling, ballast & fire-fighting
- 24h spare parts delivery worldwide
- IMO-number-based service tracking system
BESI Marine Systems GmbH is one of the world’s leading suppliers of remote control valve systems and automation solutions for marine applications — with over 55 years of experience and more than 6,500 equipped vessels.
BESI brings the systems integration expertise: AMS interfacing, Modbus RTU communication, touch screen control and the automation logic that makes PES work as a complete, vessel-ready solution. PES integrates directly into existing BESI RCV installations.
- 55+ years in marine automation
- 6,500+ vessels equipped globally
- Remote control valve systems (RCV)
- AMS integration & Modbus RTU expertise
- Global sales & service network
A product by BESI Marine Systems GmbH
in partnership with Behrens Pumpen · We move water in perfection.