EdDanzer
Mechanical
- Oct 30, 2002
- 1,028
We are building an air amplifier for a customer that runs 24 hours a day 7 days a week in an environment that has temperature variations from 0°F to 150°F. This unit pumps 450 psi air, which generates temperatures of about 400°F at the high pressure seal. Our original testing was done with Chevron Supreme 30 Wt motor oil wiped on the seals and bearings. The unit ran 1.2 million cycles, and was dissembled. The Viton high pressure seals and the filled nylon bearing showed significant wear and little oil was left. There was evidence of varnish and carbon at the top of the high pressure barrel. We assumed the oil was burning. The low pressure urethane seals and filled nylon bearing showed little wear and still had oil present.
A group decision was made to use Dow 111 grease, used by another pneumatic valve manufacture, this grease migrated into other areas and caused a functional failure.
The customer wants us to use Mobil DTE oil or Magnalube-g, a grease. We would like to use a 2 stroke motor oil. Our thoughts on choosing the 2 stroke oil is, clean burning, low varnishing, good high temperature stability, and will not cause functional failures if it migrates out of the area needing lubrication.
Our customer is concerned with the detergents in motor oils causing seal failures.
Please give reasons to support any of these lubricants, of suggest another.
Thanks in advance,
Ed Danzer
A group decision was made to use Dow 111 grease, used by another pneumatic valve manufacture, this grease migrated into other areas and caused a functional failure.
The customer wants us to use Mobil DTE oil or Magnalube-g, a grease. We would like to use a 2 stroke motor oil. Our thoughts on choosing the 2 stroke oil is, clean burning, low varnishing, good high temperature stability, and will not cause functional failures if it migrates out of the area needing lubrication.
Our customer is concerned with the detergents in motor oils causing seal failures.
Please give reasons to support any of these lubricants, of suggest another.
Thanks in advance,
Ed Danzer