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we have a mil-h-83282 test setup for test and flush hyd parts. the system has to meet cleanness requirement. the recent check found the total chlorine exceeded 100 ppm. just could not figure out where chlorine came from. the parts were dry before test. any clue?

RE: Chlorine


Chlorine residue in hydrocarbon or synthetic hydrocarbon fluids is a major problem for hydraulic system components and has been studied extensively by DoD.

Suggest searching DTIC http://www.dtic.mil/dtic/ using terms 'chlorine hydraulic fluid' [terms 'fluid' or 'oil' may be used interchangeably].

Might also try searching DTIC using terms 'chlorine phosphate ester hydraulic fluid' if Your system fluid is not hydrocarbon/synthetic-hydrocarbon based.

May also find following SAE docs of interest.
AIR81 Importance of Physical and Chemical Properties of Aircraft Hydraulic Fluids
AIR810 Degradation Limits of Hydrocarbon-Based Hydraulic Fluids, MIL-PRF-5606, MIL-PRF-83282, and MIL-PRF-87257 Used in Hydraulic Test Stands
AIR1363 Aerospace Hydraulic Fluids Physical Properties
AIR4713 Chlorinated Solvent Contamination of MIL-H-5606/MIL-H-83282 Vehicle Hydraulic Systems
AS4059 Aerospace Fluid Power - Contamination Classification for Hydraulic Fluids
ARP5891 Achieving Cleanliness Standards for Aircraft Hydraulic Systems During Manufacture

Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true.
o For those who believe, no proof is required; for those who cannot believe, no proof is possible.
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion"]
o Learn the rules like a pro, so you can break them like an artist. [Picasso]

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