CLEANLINESS

Hydraulic Cleanliness is an important aspect,when specifying hydraulic system and components like valve actuators etc....

ISO cleanliness code ISO 4406 is the widely used international standard,however,NAS 1638 is also used for this porpose widely...

As a comparison,ISO 23/21/18 is the NAS 12 Class.In your case it is 24/23/18.A cleanliness rating of 24/23/18 means,there are 80,000 to 160,000 particles greater than 2 micron in size,40,000 to 80,000 particles greater than 5 micrn in size and 1300 to 2500 particles greater than 15 micrn in size.

This may indicate,how clean your oil is !

And YES -these numbers relate to every 100 ml (dl) of oil.
Best regards Lars

Dear krishnakumar sir,
Thanks for your valuable reply.but Sir I need some more information.
I saw the report that has the value as follows

cleanliness class:ISO4406(1999) - 22/20/16
A:>4M - 3893480
B:>6M - 509900
C:>14M - 34942
D:>21M - 10987
E:>38M - 1261
F:>70M - 0
CLEANLINESS CLASS- SAE AS 4059 >12A
Please explain me this.

Thanks & regards,
Neeta Tiwari

When discussing standards, I would advise referencing rather than blogging.
ISO Codes http://www.bentlytribology.com/publications/appnotes/app06.php

Or in general http://www.bentlytribology.com/publications/appnotes.php

Good reading-

Dear Sir,

Thank you very much for your valuable reply.

Regards,

Neeta

Dear Sir,
Thank you very much for your help.As i have just completed my B.E.IN CHEMICAL and presently im working on oil analysis project,so here most of the things are very new for me.
I really need your help to understand the thing in better way.

BEST REGARDS ,
Neeta

Hi,

The Oil cleanliness codes interpretation is also based on the equipment from where the oil sample is drawn. For equipments like Gearboxes, the tolerance level is higher compared to Hydraulic systems.

Maha

Dear Sir
Thanks for your reply.
Can you give the min-max range for the diffrent equipments.

Thanks & Regards,
Neeta

Hi,

The below application note gives some reference regarding target cleanliness level for different types of machines or components

http://www.bentlytribology.com/publications/appnotes/app_clean.php

Dear Neeta,
If you go on filtration companies, as Pall, PArcker, or Vikers, you will find an inetresting information about ISO Cleanliness VS hydraulic systems with different components (valves, gear pump etc..)
The result you gave on February 29th,
cleanliness class:ISO4406(1999) - 22/20/16
A:>4M - 3893480
B:>6M - 509900
C:>14M - 34942
D:>21M - 10987
E:>38M - 1261
F:>70M - 0
seems wrong as the number of these particles will give an out of range for ISO, due to a very high level of contamination: (if particles between 160000-320000 = 25)so 3893480 will give much higher then 22.
Djaouida

I had the same problem,
I think you shoold divide the numbers given by 100 because the unit is not the same ( oil volum) to obtain ISO