The figures are differential counts, and the NAS class is usually reported as a single figure >5µm. >15µm. >25µm. >50µm. >µm. Size code. A. B. C. D. E. F. 76 SAE AS rev E Table Particle Contamination Level by Class. The SAE aerospace standard (AS) ASD defines cleanliness classes for particulate contamination of hydraulic fluids and includes methods of reporting. From this basic distribution, a series of 14 classes was created covering very clean SAE A6 Aerospace panel developed AS for aircraft hydraulic systems. . instance NAS Class 6, can be swapped to AS Class 6B through F.
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As products get more complex, so do the supply networks that build them. Because this situation could cause an uproar within the industry when companies would have to change specifications, the ISO committee decided to take the road classs least resistance and selected new zae descriptors that would give the same particle counts while retaining integer sizes. The sae as 4059 class 6b-f behind this is not entirely clear, but thought to be to separate old and new APC data.
Digital transformation may be the most frequently misunderstood and misused term sae as 4059 class 6b-f business discourse today.
SAE AS E Aerospace Fluid Power – Cleanliness Classification for Hydraulic Fluids_图文_百度文库
This subsequently became de facto ISO Are you an Engineering professional? Product innovation is speeding up. No coding system existed at the time for completed systems, so it was logical that it would be applied in this area.
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What Happened to NAS 1638?
This was based upon the size distribution of A. One aspect of the change, which may be a little unclear, is that of component cleanliness – the scope of the original NAS document. NAS was the forerunner of other contamination coding. Oklahoma State University, under the direction of Prof. This principle is a feature of many of the classes clsss have developed since. The method of counting the particles referenced the optical microscope method defined in ARP 4simply because this was the only method in existence at the time.
The size distribution was derived in using the optical microscope, so sae as 4059 class 6b-f effect, sae as 4059 class 6b-f APC was set-up to record identical numbers of ACFTD particles as the microscope. Many are specified for analyzing oil samples and ae data to NAS format for existing designs. There are three reporting options: About the Author Mike Day.
NAS saw widespread acceptance in the s and s by industries where reliability was a prerequisite, in areas such as offshore oil production, iron and steel industries, etc. The introduction of the APC during the s revolutionized the measurement of the size distribution of dirt particles in a hydraulic system.
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If you obtain the latest issue of NAS you will find the following statements: The most significant changes are: Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden.
National Aerospace Standard NAS 1 is a particulate dlass coding system used in the fluid sae as 4059 class 6b-f industry to simplify the commu- nication of data from particle counters. This concept gives AS much more flexibility than was possible with NAS because it is often the control of the cleanliness level that specifiers require rather than a fixed distribution; for example, they can specify improved control over critical sizes or relax controls over those that are not.
APC users are recommended to switch to the new sae as 4059 class 6b-f.
From this basic distribution, a series of 14 classes was created covering very clean to very dirty sae as 4059 class 6b-f, where the interval between each class is double the contamination level. The lack of traceability was a problem in the s as more companies endeavored to achieve ISO type quality systems. The reason for 6-f is not entirely clear but it is thought to be the need to separate old and new APC data.
Students Click Here Join Us! Is Sae as 4059 class 6b-f dead? Current Issue Archive Advertise. Equally, sizes that are not critical can be omitted. The accuracy, repeatability and speed of analysis allowed it to be used extensively for research into the effects of dirt on components and systems.
The basis of the code is seen in Table 3. In Table 3 it can be seen that the particle counts are defined by a number relating to the quantity of particles and a letter relating to the size.
However, sae as 4059 class 6b-f are encouraged to sae as 4059 class 6b-f to AS as soon as possible so that everyone is speaking the same language. Download Now Engineering designs that include a high percentage of procured-in components and sub-modules from external companies is the responsibility of a broad product stakeholder network.
Medium-Sized Gear Machining Company. It was also embarrassing for laboratories involved with contamination testing which often had to explain why there was no traceability and control over the dust. This distribution was based on particle contamination inside delivered aircraft hydraulic components in the s.
I’m guessing it’s equivalent to Nas 6 ISO