Safety Archives - Page 2 of 2 - RYCO Hydraulics
Understanding Filtration – Temperature and Viscosity

Understanding Filtration in Hydraulic Systems When adding filtration to an hydraulic system, it’s important to understand the role of viscosity, pressure drop, fluid cleanliness and filter efficiency (beta ratios) in the overall performance of the system. Temperature is also a key factor in determining the effectiveness of hydraulic filters. What is Viscosity? Viscosity is the measure of the resistance of a fluid to deform under sheer stress. It is commonly perceived as thickness, or as a resistance to pouring. It may also be described as a fluid's resistance to flow, or a measure of fluid friction. Water has a low viscosity, and honey has a high viscosity. However, viscosity can be affected by changes in the fluid temperature. For example, when heated, honey will flow more easily. Understanding the behaviour of a fluid's viscosity is an important part of understanding filtration technology. Pressure Drop Pressure drop is a measure of how much pressure is required to push a fluid through a restriction, or 'orifice'. A filter element acts as a restriction when fluid is flowing through it. The level of ...

Understanding Filtration – Fluid Cleanliness & Filter Efficiency

In part 1 of this series on Understanding Filtration - Viscosity and Temperature we covered the significant impact that temperature has on the viscosity of an oil, which in turn affects its performance during filtration and lubrication. There are other factors that must be taken into account when it come to hydraulic filter selection. These variables will affect each other. To select the correct filter you need to establish the expected fluid viscosity as it varies with temperature. The following must be known: The fluid type The fluid temperature at start up The fluid temperature during normal operation Other important factors are: The required fluid cleanliness target The efficiency rating of the filter Fluid Cleanliness Targets When discussing fluid cleanliness, we refer to ISO 4406 as a method of counting and quantifying contamination in a system. The chart above shows recommended ratings for common system components. Many hydraulic manufacturers publish required fluid cleanliness levels for their equipment. Guide to Filter Placement The table below can be used as a guide for filter placement in a system. Each of the blocks ...

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