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The
Sampling Process
Trend Analysis
A single sampling analysis is useful in providing information
when critical failure conditions exist. However, trend analysis
is a better tool for estimating the useful life or overall
condition of your engine or equipment. Trend analysis samples
are taken and analyzed at regularly scheduled intervals.
Comparing the most recent analysis to previous reports on a
given machine shows the development of trends. Monitoring these
trends enables early detection of internal abnormalities. Tested
values falling within acceptable limits may show a pattern of
subtle variance, which could signal a developing problem.
Machines of the same type will accumulate contaminants and wear
at different rates. Performing trend analysis on each machine is
the most effective method of giving you an internal look at your
equipment and enabling you to deal with developing problems
before they become catastrophic situations.
Sampling Frequency
The frequency of sample analysis from your equipment depends on
the machine type, machine application and condition, operating
environment and other variables. For example, many machines that
operate in harsh environments, such as heavy equipment in mining
or construction, require short oil sampling intervals - every
100 to 300 operating hours. However, certain power transmission
systems, such as gearboxes and hydraulic systems used inside
manufacturing and production facilities, require no more than
quarterly sampling intervals. The following table lists generic
sampling frequencies for common equipment types, and is provided
as a guideline only. Additional information is available from
Oil Analyzers Inc., your lubricant supplier, and the equipment
manufacturer.
Collecting a clean and representative oil sample is critical to
the oil analysis process. Put simply, an oil analysis is only as
good as the sample taken. The accuracy and reliability of the
data produced by an analysis hinges on receiving a
representative sample from the equipment to be tested. To assure
that the sample extracted is representative of the system,
always follow proper sampling procedures. |
