Dose anyone have data about oil cleaness for hydraulics system as per NAS and/or ISO standards.

Appreciate your sharing.
Cheers.
Phoo

Dear Phoo,
The recommended cleanliness level for a hydraulic system depends on several things. If your hydraulic system is using a servo valve and the pressure is above 2500 PSI then your cleanliness level should be 14/12/10. (Pall's recommendations). At the other end of the scale is a simple hydraulic system with a gear pump and running at pressures under 1500 PSI. It's cleanliness level can be 19/17/14. The components and pressure determine what the cleanliness level should be. Pall puts out a laminated poster giving the recommended cleanliness levels for all the different hydraulic components, pressures and recommended cleanliness levels. It also gives cleanliness levels for other industrial components, gearboxes, bearings, etc. It also tells you what pall filter should be used to get you to that level. The poster is called "How Clean Is Your System Fluid?"

See table one in this article.

http://www.machinerylubrication.com/article_detail.asp?...0Cleanliness%20Codes