Nas 1638 classes based on weight of particles are not applicable to these classes and are not included. Nas 1638 archives document centers standards forum. L4532 contamination guide for hydraulic fluids, oils and. Iso shall not be held responsible for identifying any or all such patent rights. The courses provide premier training on critical asme codes and standards. Most users use a single code number based on the highest particle count in any of the size ranges. The application of this standard was extended to industrial hydraulic systems as nothing else.
As4059e allows the analysis and reporting of smaller particle sizes than nas 1638. The nas system divides particles in 5 particle size ranges. Technical cleanliness inspection system olympus cix series. Fuel standard gost 172162001 is also included as a standard option. The sae as 4059 reporting standard was introduced as the replacement of nas 1638 which became obsolete in early 2000s. Nas 1638 4 5 6 7 8 9 10 11 iso 44061999 1510 161411 171512 1816 191714 201815 211916 222017 iso 4406 first number. Replacement documents are as4059, aerospace fluid power cleanliness classification for hydraulic fluids, and nas380, nas. Guide to contamination standards 7 nas 1638 table the nas 1638 cleanliness standard was developed for aerospace components in the us and is still widely used for industrial and aerospace fluid power applications and in the uk north sea industries. National aerospace standard nas 1638 1 is a particulate contamination coding system used in the fluid power industry to simplify the commu nication of data from particle counters. Publication as an international standard requires approval by at least 75 % of the member bodies casting a vote. Nas 1638 became a standard not only for the aerospace industry but also throughout many other industries as well. Defining and maintaining fluid cleanliness for maximum.
Particularly in table 2, cumulative particle counts. Classes of contamination according to nas 1638 january 1964. As4059e was developed as a replacementequivalent to the obsolete nas. The sae aerospace standard as as4059d defines cleanliness classes for particulate contamination of hydraulic fluids and includes methods of reporting related data. Measures the size and quantity of particles in industrial fluids. The figures are differential counts, and the nas class is usually reported as a single figure representing the maximum allowed. Pfc400w portable particle counter measures the size and quantity of particles in industrial system fluids proven laser light blockage technology. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The conversion from nas 1638 cleanliness class specifications to as4059 class specifications is defined. Nas 1638 is an older standard developed in 1964 to define classes of contamination in. The national aerospace standard nas 1638 was developed in the 1960s to help control the contamination levels of hydraulic fluid within hydraulic components. This sae aerospace standard as defines cleanliness classes for particulate contamination of hydraulic fluids and includes methods of reporting related data appendix a. The nas 1638 cleanliness standard the nas 1638 cleanliness standard was originally developed for aerospace components in the us but is still widely used for industrial and aerospace fluid power applications.
Nas 1638 national aerospace standard the nas system divides particles in 5 particle size ranges. Filtration and flushing strategy 7 cleanliness requirement iso 4406 versus nas 1638 the recommended standard for definition of oil cleanliness level is iso 4406. Oil analysis tables rsa reliability and maintenance. Data sheet by aerospace industries association national aerospace standard, 12222011. The noise involved in this measurement principle is extraneous liquids and gases which cause the light beam to be interrupted. However, many in the fluid power industry continued to use nas 1638, and there are still many companies still using it today.
Nas 1638, cleanliness requirements of parts used in hydraulic systems, has just be issued as the new revision 4. Contamination guide for hydraulic fluids, oils and diesel fuels l4532. A particle count will show up to have almost the same nas class rating within the different particle ranges. The nas 1638 coding system defines the maximum numbers permitted of 100ml volume at various size intervals differential counts rather than using cumulative counts as in iso 4406. Oil cleanliness is critical to the reliability of your machinery. The figures are differential counts, and the nas class is usually reported as a single figure. If nas 1638 is used, the number of par ticles in a 100 ml sample larger than 6 and. Understanding nas values in engine oils lubrication. The contamination classes selected are based on the widely accepted older nas 1638 cleanliness classes.
Code courses are developed and presented by respected industry experts who understand and can communicate code and standard relevance and their impact on safety, quality and integrity. Subject matter experts from aia member companies participate in committees and working groups to develop and maintain the nas library, which currently contains over 1400 active standards. What different oil analysis test will detect oil analysis important tables oil analysis test caution critical shell limits cleanliness iso 1411 iso 16 no data dryness 200 600 no data tan 0. A typical iso 4406 particle count will be indicated as. Nas 1638 particle count table particle sizing systems.
The particle numbers can range from single particles to many millions. The nas 1638 cleanliness standard was developed for aerospace components in the us and is still widely used for industrial and aerospace fluid power. Pdf the machining of a cone frustum as specified in national aerospace standard nas 979 is widely accepted as a final performance test for fiveaxis. National aerospace standard nas 16381 is a particulate contamination coding system used in the fluid power industry to simplify the commu nication of data. Sae as4059 rev e table is technically identical to iso 11218. The table below shows the classification values that may still be in use for older specifications based on hiac particle counters. The table below shows the number of particles100 ml fluid. The figures are differential counts, and the nas class is usually reported as a single figure representing the maximum allowed particle counts i. Nas1638 is comprised of fluid cleanliness classes, each class defined in terms of. In nas 1638 classification the code number refers to a maximum quantity of particles within a specific size class. It converts the particle counts at various size ranges into convenient broadbase classes. Hydraulic fluid power fluids method for coding the level of contamination by solid particles. Nas 1638 graph triple r europe international particle count standards. Nas 1628 is a american standard that references the contamination load based on a breakdown of the different particle sizes for specific particle sizes.
Although there is no guidance given in the standard on how to quote the levels, most industrial users quote a single code which is the highest recorded in all sizes. Another fantastic feature is the ability to create a custom reporting standard that can report out to 9 individual customer selectable channels. The recommended standard for defini tion of oil cleanliness level is iso 4406. The replacement standard sae as 4059 is a national standard intended for the us aviation industry only. The nas 1638 cleanliness standard was developed for aerospace components in the us and is still widely used for industrial and aerospace fluid power applications. International particle count standards iso 4406 particle contamination in oil is speci. Pdf machining tests to identify kinematic errors on five. Nas filter elements nas 1638 cleanliness codes nas 1638. Nas 1638 table the nas 1638 cleanliness standard was developed for aerospace components in the us and is still widely used for industrial and aerospace. As technology advances, the demands placed on a lubricant are everincreasing.
A comparison of nas 1638 and iso 4406 cleanliness codes. Aerospace fluid power contamination classification for. Nas 1638 is an older standard developed in 1964 to define classes of contamination in aircraft components and hydraulic fluids. The national aerospace standards nas are voluntary standards developed by the aerospace industry. The 3 page national aerospace standard remains inactive for new design and is available for purchase from document center inc. Filtration handbook filtration and flushing strategy. The comparison of the nas 1638 classes to as4059 classes and levels is provided and are defined and the differences explained appendix b.
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