Hydraulic energy is the energy obtained from the movement or pressure of liquids to transmit power or mechanical energy.
Read more
Tips and advice
How can you protect your hydraulic systems?
03.09.2024
Contamination of hydraulic fluid
Hydraulic systems are essential in many sectors, where their reliability and efficiency play a crucial role. However, the performance of these systems can be seriously compromised by various contaminants in the hydraulic fluid. Contaminants such as solid particles, water and gases can cause costly breakdowns and significantly reduce component life. Understanding the sources and effects of these contaminants is essential to implementing effective preventive measures and keeping hydraulic systems running smoothly.
Solid particles
“💡 Standards for assessing particulate pollution include ISO 4406 (European), NAS 1638 (industrial), SAE and NAV AIR (marine hydraulic fluids). They set thresholds for measuring contamination by solid particles.“
Water
Water is a frequent contaminant in hydraulic systems, responsible for one in five breakdowns. Once in the system, it causes oxidation of the fluid and attacks its additives. It also corrodes metal parts and reduces the fluid's lubricating capacity.
This contamination is generally due to condensation. When moist air enters through the intake vents, the large temperature variations and thermal shock caused by the return of the hot fluid into the reservoir transform this gas into a liquid, which then settles in the reservoir and contaminates it. Damaged vents, leaking seals or heat exchangers can also allow water to seep in.
This contamination is generally due to condensation. When moist air enters through the intake vents, the large temperature variations and thermal shock caused by the return of the hot fluid into the reservoir transform this gas into a liquid, which then settles in the reservoir and contaminates it. Damaged vents, leaking seals or heat exchangers can also allow water to seep in.
How do you know if the oil is contaminated by water?
The water in the hydraulic fluid can take different forms.
- In dissolved form, it is imperceptible, but can still affect the properties of the fluid.
- Free water, on the other hand, accumulates in visible droplets at the bottom of the tank or components.
- Emulsified water gives the fluid a milky appearance, increasing its viscosity and causing lubrication problems. To detect water contamination, test your fluid regularly.
Gas
The HIFI FILTER® range of filters for hydraulic fluids
Filters are crucial elements in hydraulic systems, blocking impurities, protecting components and extending the life of the system. The level of filtration depends on several factors:
HIFI FILTER® offers a wide range of housings, filters and accessories, designed for different pressure levels and locations in the hydraulic circuit, from fluid intake to pressure zone, tank venting and return.
- Cleanliness requirements and component sensitivity
- The level of contamination in the ambient environment
- The machine's operating cycle
- Easy maintenance of components and spare parts
- System operating pressure
HIFI FILTER® offers a wide range of housings, filters and accessories, designed for different pressure levels and locations in the hydraulic circuit, from fluid intake to pressure zone, tank venting and return.
Aspiration
Pressure
Return to
Tank ventilation filters and air dryers
Tank accessories
Filter groups
Maintenance tips
Regular maintenance is essential to keep hydraulic systems running smoothly. Here are some key tips to follow:
- Follow the manufacturer's recommendations: Consult the maintenance manual to find out what type of fluid to use and how often to change it.
- Do not mix fluids: Always use the same type of hydraulic fluid to avoid undesirable chemical reactions that could damage the system.
- Check the fluid level: Make sure the level remains sufficient to avoid pressure problems, cavitation and premature wear.
- Analyse the fluid regularly: Test for the presence of water, solid particles or other contaminants. This helps identify potential problems before they damage the system.
- Check filters: Replace filters if they are contaminated or damaged. Clogged filters can cause breakdowns.
- Plan regular maintenance: Include fluid replacement, tank cleaning and mechanical component checks in your maintenance programme. This will reduce the risk of failure and extend the life of the system.
In the merchant navy, no type of system is immune to contamination, which can lead to costly breakdowns and difficult repairs at sea.
Read more
When it comes to fuel tanks, ventilation is of vital importance. Why is this? Poor ventilation encourages two phenomena that can cause breakdowns or even major damage to your tanks: "negative pressure" and "positive pressure".
Read more