Oil & Fuel Filtration
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Dunston Trading Estate
Chesterfield, Derbyshire
S41 9RF
sales@fa-st.co.uk

What is Contamination?
Contamination refers to the presence of anything in machine fluid systems, which does not belong there. Examples of contaminates include: paint flakes, rag fibres, metals, grease, carbon, weld splatter, sealing materials, dust and water.
When systems are contaminated, efficiency drops, cycle times increase and component and fluid life are shortened. If contaminated fluids are left untreated, this can eventually lead to catastrophic system failure, unplanned downtime and costly repairs.
Demand for increased productivity has produced industry trends toward electro-hydraulics, higher system pressure and tighter internal clearances. As a result of these trends, today’s fluid systems will not tolerate dirt and contamination. This threatens reliability throughout the life of all types of hydraulic operated machinery.
Contamination of Bulk Oil .
When bulk oil is supplied to sites it does not come under the strict guidelines that the oil producing companies adhere to within their operations. The fluid often changes storage containers several times before it reaches the end applications. The oil is moved from the oil producers storage tanks by sea, rail and road transport, and at each transfer point contaminants, particularly dust particles and water may enter the pipe work and tanks. New oil is not clean oil. The cost to filter the bulk oil at each of these points would be enormous and the industry feels that it would be unrealistic to undertake such a task.
How many end users of the oil products actually have the bulk oil sampled and tested before putting it into their machines? Very few, therefore by installing a filtration system on the storages or IBC’s etc. The fluid would then meet the machine ISO oil cleanliness, this would ensure that clean oil is available to the end user
Why is water in fluid bad?
When water is present it:
- Depletes some additives and reacts with others to form corrosive by-products which attack some metals
- Reduces lubricant film-strength, which leaves critical surfaces vulnerable to wear and corrosion
- Reduces filterability and clogs filters
- Increases air entrainment ability and cause bacterial growth
- Increases the likelihood of cavitation’s occurring
Dissolved Water contamination is the least harmful of the three types of water. Dissolved water is a function of the environmental - relative humidity, temperature, and oil type will normally determine what dissolved water content will be. Dissolved water does not affect lubricity.
Emulsified water is water that has been mixed, homogenised and/or mechanically emulsified in the lube oil to form extremely strong emulsions. Strong in the sense that gravity or other devices will not work in separating the two phases. Emulsified water is capable of reducing lubricity.
Summarising Water in Hydraulic Fluids
Oil becomes cloudy when it is contaminated with water above its saturation level. The saturation level is the amount of water that can dissolve in the oil’s molecular chemistry and is typically 200 – 300 ppm for every 1ml of oil at 68°F (20°C) for mineral oils. If hydraulic oil is cloudy it indicates that water is present. A guide to water contamination is 10,000 ppm is equivalent to 1% water in a hydraulic system so a 300 litre tank with a 1% reading would contain 3 litres of water. All oils have saturation points as they are designed to hold in suspension a small amount of water. Once saturation point is reached it becomes free water which can settle to storage tank bottoms and provide an ideal environment for bacteria to grow.
Fluid Application for FA-ST Filtration System
The cleanliness of your fluid is critical to the trouble free and cost effective operation of your system. Components can be very expensive and need special consideration when selecting and filtering. ISO 4406 code is a standard that is recognised in the industry. Certain recommended fluid cleanliness quantities are necessary to realise the best performances and cost saving operation of your hydraulic system.