Dean Frederickson
24th September 2007, 12:53 PM
I have googled this "Cleanliness level - 10 microns nominal" a new customer requirement and I can't find anything. We manufacture hydraulic tubes one of our customers started putting this cleanliness standard in the notes section of the part print, it's their own standard.
"After descaling, deburring, and derusting the interiors of tubing shall be flushed with a fluid which has passed through a 10 (in this example) micron nominal filter at a velocity of not less than 25 feet per second and sealed immediately. Any fluid or subsequent treatment rinse to prevent subsequent corrosion shall be equally cleaned to prevent further contamination if a corrosive or non-compatible flushing fluid were used.
Conformance to this specification may be verified by passing a small quantity of the residual fluids through clean, fine filter paper, and observing, counting, and measuring the particles in the residue under a microscope. A 10 micron nominal particle will be understood to mean a particle whose diameter does not exceed .300 microns. Obviously, in practice, a few larger particles will be found and a few would not be cause for rejection.
Does anyone in the cove know where I can purchase this equipment (microscope and filters), what type microscope and filter paper are needed? Has anybody done this type inspection before? Any help will be appreciated.
"After descaling, deburring, and derusting the interiors of tubing shall be flushed with a fluid which has passed through a 10 (in this example) micron nominal filter at a velocity of not less than 25 feet per second and sealed immediately. Any fluid or subsequent treatment rinse to prevent subsequent corrosion shall be equally cleaned to prevent further contamination if a corrosive or non-compatible flushing fluid were used.
Conformance to this specification may be verified by passing a small quantity of the residual fluids through clean, fine filter paper, and observing, counting, and measuring the particles in the residue under a microscope. A 10 micron nominal particle will be understood to mean a particle whose diameter does not exceed .300 microns. Obviously, in practice, a few larger particles will be found and a few would not be cause for rejection.
Does anyone in the cove know where I can purchase this equipment (microscope and filters), what type microscope and filter paper are needed? Has anybody done this type inspection before? Any help will be appreciated.
