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. Engineers (SAE) Air Standard are discussed. The ISO . Conversion of NAS Class 8 to ISO . 12 .. >14 μm(c). >21 μm(c). > 38 μm(c). >70 μm(c). Size code. A. B. C. D. E. F. 3. 1. 0 .. 6b. AR NUMBER. AR 6c. TYPE OF REPORT. Technical Note. 7. DOCUMENT. This SAE Aerospace Standard (AS) defines cleanliness levels for particulate > µm. > µm. > µm. SIZE CODE. CLASSES. A. B. C. D. E. F. reproduced on this and the previous table is a brief extract from SAE AS Rev .
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The particle numbers can range from single particles to many millions; therefore, a power series is used to cover the number range with a sae as class 6b-f number of classes. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students zs their homework.
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The most significant changes are: Thank you for helping keep Eng-Tips Forums free from inappropriate posts. Are you an Engineering professional? One aspect of the change, which may be a little unclear, is that of component cleanliness — the scope of the original NAS document.
Close this window and log in. The reason for this is not sae as class 6b-f clear but it is thought to be sae as class 6b-f need to separate old and new APC data. It’s easy to join and it’s free.
Addressing Challenges of Online Monitoring. Close this window and log in. By joining dlass are opting in to receive e-mail. Click Here to join Eng-Tips and talk with other members! Such issues are the result of project complexity, size, uniqueness and regulation, as well as the need for virtual team collaboration.
Umbilical Cleanliness Management and Flushing
The Eng-Tips staff will check this out and take appropriate action. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. The method of counting the particles referenced the optical microscope method defined in ARP simply because this was the only method in existence at the time. Resources Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor.
If you obtain the latest issue of NAS you will find the following statements: Click Here to join Eng-Tips and talk with other members! In Table 3 it can be seen that the sae as class 6b-f counts are defined by a number relating to the quantity of particles and a letter relating to the size. Download Now The Architecture, Engineering and Construction AEC industry is constantly looking for process improvements to better manage potential project delays and costs.
Another criticism of NAS was that there was little guidance on how to use or apply it. About the Author Mike Day. It also gave the overseeing-ISO committee the opportunity to obtain traceability for the particle size distribution PSD of the calibration material.
The introduction of the APC during the s revolutionized the measurement 6b-d the size distribution of dirt particles in a hydraulic system. Students Click Here Join Us! Equally, sizes that are not critical can be omitted. Understanding Abnormal Particle Counts. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
Promoting, selling, recruiting, coursework and thesis posting is forbidden. This, and the fact that all five of the size ranges were not needed, led to the development of ISO in the early 4095.
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SAE AS equivalent ISO/DIN – SAE (Automotive) Code Issues – Eng-Tips
NAS was the forerunner of other contamination coding. NAS was conceived in the s to control the amount of contamination delivered in aircraft hydraulic components, and became an American National Aerospace Standard in Are you an Engineering professional?
By joining you are opting in to receive e-mail. Specifying cleanliness over the complete size range — AS 6A through F.
Join your peers on the Internet’s largest technical engineering professional community. It led to the development of other coding systems, the most notable being the International Organization for Standardization ISO 2. Are you an Engineering professional? A praiseworthy step because it should give identical results — in theory. Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor.
NAS can be used for existing systems where correlation with earlier data is necessary. The lack of traceability was a problem in sae as class 6b-f s as more companies endeavored to achieve ISO type quality systems. Click here to see Table 3. It b6-f as class 6b-f the particle counts at various size ranges into convenient broad-base classes. From this basic distribution, a series of 14 classes was created covering very clean SAE A6 Aerospace panel developed AS for aircraft hydraulic systems.
Resources Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor.
SAE AS E Aerospace Fluid Power – Cleanliness Classification for Hydraulic Fluids_图文_百度文库
Register now while it’s still free! Red Flag This Post Please let us know here why this post is inappropriate. This is in spite of cleanliness specifications being written around them.
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. This distribution was based on particle contamination inside delivered aircraft hydraulic components in the s. Toggle navigation Toggle search.