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.
