HydraulicFluidContaminationandAssessment.pdf

7/28/2019 HydraulicFluidContaminationandAssessment.pdf

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Hydraulic Fluid

Contamination and Assessment

Presented by: Ernie Parker Fluid Power Engineering Technology Instructor Hennepin Technical College

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Heat problems are generally a design problem.

Assembly could be improper hose installation.

Contamination is everyones concern.

About 95% of all hydraulic problemsare cause by heat, assembly, andcontamination.

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You are a Fluid Power Machine

Pump Heart Arteries Pressure Lines Veins Return Lines Kidneys Filter Kidney Loop Off-line Filtration Muscles Cylinders & Flow Controls Brain PLC (Programmable Logic Controller)

Our Sensors (Sight, Smell, Touch, & Hearing, -Instrumentation Nervous System Servos & Proportional Control Systems Lungs Pneumatic System

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How careful do you want ahospital and doctor to be whenworking on you?

That is how you should treat a hydraulicsystem, with the same cleanliness ashuman surgery.

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Sizes of Particles in Micro-meters Grain of Table Salt 100 Human Hair 70 Lower Limit of Visibility 40 White Blood Cells 25 Red Blood Cells 8 Average Bacteria 2 100 mesh screen = 149 325 mesh screen = 44 1 micro-meter = .000039 in or 39/1,000,000 of an inch

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1. New Oil

2. From manufacturing and handling of components during shipping and fabrication

3. Ingressed contamination

4. Wearing of components

Sources of Contamination

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Particles found in new fluids range fromrust, dirt, sand, & water from eithercondensation or leakage into a containerfrom sitting in the elements.

Examples of WaterTake a five gallon pail that has been emptyand screw the cover back on and leave it

outside in the rain. After a couple of goodrains, you may have of water in thebottom of the pail and yet the cap wasscrew on tightly.

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When stored properly, one can still find variousparticles.

New oil has a rating of approximately 33 micronor 17/16/14 on the ISO 4406 chart from areputable supplier.

The Hydraulic Specialist study guide suggeststhat new oil is in the range of 20/18/14. Thatmeans there are between 81 and 160 particles14 micron in size per ml.

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Components ports not plugged Components stored in bad environment Pumps/motors prefilled with dirty or unfiltered oil Use of floor dry or similar oil absorbents in shop areas Dirty hands, shop rags & lint used during assembly

Dirty work benches Dirty oil in test bench use to performance check components Welding and fabrication contaminate Broken tools during manufacturing Fittings laying around and not cleaned Dirty hoses from assembly that were not cleaned and capped Assembly in a fabrication environment Dirty manufacturing procedures Dirty cutting fluid Improper flushing techniques Is a high enough velocity used to create flow turbulence when flushing parts? Dirty ports plugs Shop rags used to plug ports Not cleaning around ports before removing plugs for assembly Reservoirs not clean properly before assembly

Filters on the shelve but not in sealed container

Where does manufacturing

contamination come from?

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Contamination Types and Sources

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Contamination Basics

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Ingressed Contamination

Reservoir vent port Access covers not sealed

Components ports left open Cylinder wiper seals damage by outside sources

such as rust or nicks in rods Cavitation

Wear of components cause by dirty oil or toolow of viscosity of oil Wrong or poor additives Too course of filtration23


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Wearing of Components

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Thanks to our industry partners for their contribution with this presentation:

Eaton/Vickers Corporation & Parker Hannifin Corporation

Please continue your education by checking out the following:

The Systemic Approach to Contamination Control By Vickers

The Handbook of Hydraulic Filtration By Parker

Special Thanks

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HydraulicFluidContaminationandAssessment.pdf

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