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As a policy of continual improvement, RMF reserves the right to alter the specification without prior notice.
201.028 REV 1
Date of Issue: 18 June 2018
11.10 Clean Working Practices
The majority of hydraulic systems require cleanliness which controls below around a 40 micron threshold (beyond
the limit of human eyesight). When analyzing particles down to levels of 4um, 6um & 14um you are talking about
objects of a cellular/bacterial size. This creates various challenges, and is starting to drive better and cleaner
working practices in industry. Our products are at the forefront of this challenge, and will help you to manage the
quality and productivity of your systems.
Do’s
• Do use filter breathers on tank tops
• Do use tank designs, which are self
-draining (sloped or conical).
• Do use tanks which can be sealed off from the surrounding environment.
• Do exercise
care and use funnels when filling tanks with fluid.
• Do utilize stainless steel and methods such as electro
-polishing in the design of system components upstream of
your first filter set.
• Do perform off
-line analysis in a controlled environment such as a laboratory which should contain fewer
airborne contaminants that where the sample was taken from.
• Do use suitable, glass bottles (ideally certified clean) to take samples, along with a hand pump to reduce
contamination ingress.
• Do filter your system
thoroughly before using it in your production process.
• Do perform a statistically large enough sample of particle analysis results (25) to arrive at a base cleanliness
level for your system.
• Do make sure that filters are correctly sized for your applications and cleanliness you are trying to achieve.
Don’ts
• Don’t eat, drink or smoke around critical systems/processes.
• Don’t leave tools, objects, clothing or other materials etc. on surfac
es or tanks of critical systems.
• Don’t use open tanks on critical systems.
• Don’t take samples or perform on
-line analysis from the top of a reservoir/tank.
• Don’t design/use tanks which contain crevices (internal corners etc.).
• Don’t assume that if a sample looks clean, that it is. You won’t be able to see the contaminants.
• Don’t perform off
-
line analysis in an “un
-
controlled” environment. E.g. workshop
• Don’t rely on a single test for a capable representation of your system.
• Don’t start using y
our system/process until it has gone through a commissioning period whereby contamination
levels are relatively stable.
• Don’t mix fluids into the same system. They can emulsify and eliminate any chance of a reliable particle count.
• Don’t use unsuitable
containers to take a fluid sample.
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