A Energy-efficient hydraulic solution for the ferry quayside bridge

- We wanted to switch from mineral hydraulic oil to biodegradable hydraulic fluid so that the bridge would operate as environmentally friendly as possible. With the hydraulic unit from Servi, which operates on frequency control and with EAL oil, we have a hydraulic system that is energy-efficient and sustainable as any alternative system, and which at the same time has the energy-efficient properties that hydraulics have, says Andreas Tennøy Brekke at the County Roads Department in Møre og Romsdal County Municipality.

In 2024, Møre og Romsdal decided to only use biodegradable hydraulic lubricant on the hydraulic units at all ferry piers in the county. 

With biodegradable hydraulic lubricant in the hydraulic system, you can minimize the negative impact on the marine environment if the fluid were to leak. If you are unfortunate enough to have the fluid leak from the hydraulic system, it will break down in nature in a way that does not harm the environment. 

Servi Group has supplied this to many ferry piers.

FAKTA

  • IndustryMarine
  • Customer: Mesta AS
  • Delivery: 
    Replacement of mineral oil to biodegradable fluid and Green ESPU (hydraulic unit)
  • When: As of 2019, Servi has delivered a total of over 30 systems (during 2024, the ferry quays will have started using EAL lubricant)
  • Exected by Servi Group 

-          Especially recently, we have noticed that more and more people are demanding hydraulic environmentally friendly solutions, says Finn-Ove Kvalsvik, VP Service Ulsteinvik at Servi Group, who adds that the hydraulic unit at the ferry dock is very energy efficient.

Biodegradable lubricants

Servi supplies biodegradable hydraulic fluids, such as Shell Panolin S4 HLP Synth EAL, to reduce environmental impact. Traditional mineral oils in hydraulic systems can pose a significant risk to the environment. By using biodegradable lubricant in hydraulic systems, the negative impact on marine ecosystems can be significantly reduced if a leak occurs.

The hydraulic power unit, also called Servi ESPU (Energy-Saving Power Unit),for this ferry terminal is a redundant unit with torque limiter on axial piston pumps. The unit is driven via frequency converters, which ensures optimal speed and energy consumption. This means, among other things, that the unit is only driven when the bridge is to be raised.

When the bridge is lowered, this is controlled by means of valves and the hydraulic fluid. In this way, significantly less energy is used than with a traditional hydraulic power unit.

The very "heart" of the system; hydraulic unit with redundancy, and torque limiter on the axial piston pumps. Together with frequency converters, this provides optimal power utilization.

Servi ESPU (Energy-Saving Power Unit)

Save energy and service costs and protect the environment: Servi ESPU is a greatly improved hydraulic power unit. It has up to 80 percent lower energy consumption and lower noise levels, and it results in lower service costs.

Why hydraulics on the bridge?


The energy density and the potentially enormous forces that can be obtained from hydraulics, there is no other power source that can compete with within the same dimensions.

Two large cylinders and a hydraulic unit are used to control the bridge. The hydraulics contribute to a highly efficient power transmission, with precise control over speed, direction and force.

Read more about the properties of hydraulics

System for kondensutskilling, som sikrer kondensfri hydraulikk-væske til tross for store temperatursvingninger gjennom hele året

A traditional unit of this type can consume up to 15 kW continuously, which means that even with a small load there is high power consumption and a lot of noise. With the hydraulic unit that is currently installed on the ferry quay, the unit only uses the power that the system requires when the bridge is in use, while being very quiet.

One stop shop - marine

To enable you to operate more efficiently and smartly at sea, we ensure that we deliver and manufacture innovative quality products tailored to your needs. Together with Servi, you get over 100 years of expertise in hydraulics and related technologies – with Norwegian quality.