![]() The two most likely to be encountered in the oil & gas, and process industries are The ISO Cleanliness Code (ISO 4406), and The NAS 1638 cleanliness standard.Īn introduction to each of these allowable particle contamination standards is provided below. Measuring hydraulic cleanliness is not straight forward, consequently various standards exist on this subject. What are the Standards for Hydraulic cleanliness? Therefore it is common to specify that the hydraulic fluid used in the system is cleaned to a measurable degree of cleanliness e.g. Clearing a blockage can be difficult, time consuming and very expensive, especially in subsea applications. Integral to the actuator are components with small bores that can become blocked if the fluid has particles of debris within it. Hydraulic fluid is used as the motive power for many actuated valves, often in subsea applications. Why is Hydraulic Oil Cleanliness Important? A key parameter in determining the quality of your hydraulic oil is its cleanliness, or as it is sometimes refered to, the oil's particle count. ![]() ![]() Most equipment manufacturers will list guidelines as to what cleanliness code is acceptable, and that’s all you need to know.Good quality hydraulic oil is essential in any hydraulic circuit. However, different oils can have different allowances for what we deem “clean” or “dirty.” The chart below shows the clean to dirty ranges for four types of oil:īut wait! How do we arrive at the 18/17/15 or 17/15 range? Using this chart:Ĭonfusing, right? That’s why we use the code. The higher the ISO Code, the dirtier the oil. The chart does not list the actual number of particles counted at 5 and 15 microns. Those two numbers (17 and 15) identify a range of particles counted in the size above 5 and 15 microns in size. The ISO 2-number code in this example is 17/15. These three numbers (18, 17, and 15) identify a range of particles counted in the size above 4, 6, and 14 microns, respectively. The ISO 3-number Code in this example is 18/17/15. In the chart below, the number of particles larger than 14 microns in size was 169.2. The right column is the number of particles per mL of sample that were found to be larger than each micron size. The left column shows the size in microns. ![]() Every particle count test by Blackstone is reported in ISO 4406 (2- and 3-number codes), NAS 1638, and SAE AS4059 formats. The particles are counted in six different size ranges (see the sample Particle Count test results below). Below is a particle count report for hydraulic oil. In oil laboratories, automatic particle counters determine the ISO code. Without the use of the ISO Code, a confusing series of numbers would have to be examined to determine how clean an oil is. The test is commonly referred to as the particle count. The ISO Code is a system for representing particle concentrations in oil. ![]()
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