| Contaminated Oil & Malfunctions |
The greatest number of hydraulic equipment malfunctioms is due to contaminated oil.
However, dirty oil can result in more than just a temporary malfunction.
Contaminated oil can also hasten the deterioration of hydraulic equipment and permanently
decrease overall efficiency.
Common question include: What kind of contaminants are harmful? How do they enter the
hydraulic system?
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Contaminate Oil Top | Filtration-Basic Concepts | Catalogue | Inquire |
| Classification of Contaminants |
Solid Particles
| Oxidation Metal | Welding sludge, hammering scale & pipe scale |
| Metal particles | Burrs & particles from equipment operation, spatter from welding |
| Silica | Molding sand, grinding particles & dust in atmosphere |
| Chemical materials | Fragments from packing seals, fragments of paint from coating, etc. |
| Fiber waste | Loss fibers, particles from a glove |
Liquid & gas
| Moisture | Moisture in the atmosphere |
| Different kind oil | Grease, cutting oil, rust inhibiter and hydraulic fluids of other types |
| Air | Air mixed into the oil |
| etc. | Sludge which occurs with the degradation of petroleum products |
| Contamination Control |
Management of the early stage contamination of hydraulic equipment is very importance.
A high contamination level at the time of the primary assembly can become a greater
problem
in the long run. It can result in secondary wearing, shorten the life-span of the
equipment,
become the cause of malfunction or could adversely affect equipment performance.
[The following precautions can be taken in advance.]
| 1. | Management of cleanness of each part before system assembly. |
| 2. | Througth flushing following assembly. This is especially effective if
conducted in a large scale separate circuit piece of equipment. |
| 3. | Match a filter to the system requirements.(Please consult) |
| 4. | Periodic exchange of filter. |
The above procedures will allow a filter to catch the contaminants effectively.
This will help to prevent malfunctions caused by the unwanted contaminants.
Contaminate Oil Top | Filtration-Basic Concepts | Catalogue | Inquire |
| Selection & Arrangement of an Appropriate filter |
Maintaining a clean system is a primary condition. For an effective outcome, it is
necessary to arrange
the filter in an appropriate position.
The appropriate filter position is shown in the figure shown below.
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| Timing for Filter Exchange |
The majority of filters currently being used must be periodically replaced with clean
filters.
As filters catch suspended contaminants, the filter pores gradually get clogged and close.
Not only will the pressure loss across the filter increase, at the same time the
effectiveness
of the filter will decrease.
This is when replacing the filter becomes necessary. A standard filter replacement time is
not clearly
defined since the filter's effective life can depend on the filter location in the
hydraulic system and
the type of oil used.
However, pressure loss across the filter is commonly used as a indication of when to
replace a filter.
(Yamashin commonly recommends that filters be replaced when the pressure loss is between
0.1MPa-0.15MPa. This normally equates to -1,000 hour of use.)
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| Filter Selection |
The purpose of using filters is to remove contaminants. Yamashin recommends that filter
capacity be
considered before deciding on the pipe diameter. Yamashin can recommend the appropriate
filtering
area to match the system flow rate.
(Please consult)
| Reliability of YAMASHIN FILTERS |
Yamashin vigorously test its filters under a variety of conditions. We are confident
that our filters are capable
of satisfying even our most demanding customer requirements. Examples of some of our
testing are shown
below.
Filter performance testing on |
Durability testing on |
Contamination measurements are taken using a variety of scientific equipment. |
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Contaminate Oil Top | Filtration-Basic Concepts | Catalogue | Inquire |
