Page 44 - Inner front

42 ;sia wg jk l,dmh FACILITY OF WEAR METAL ANALYSIS

Early detection of wear metals in lubricants
Planned Preventive
and greases improves machinery reliability,
Maintenance (PPM) is
especially if done as part of a professional oil
the popular periodic
condition monitoring program.
maintenance strategy
which practice by SLN Inductively Coupled Plasma Optical Emission
presently. The MTTU Spectrometer (ICP-OES)
initially inaugurated at
ICP-OES is the machine
SLN Dockyard on 01 Aug 12 as a basement measure to which used for wear
move on to Condition Based Predictive Maintenance metal analysis in SLN
(CBPM) techniques and re-established at SLNS Mahasen and same was procured
under the Directorate of Engineering w.e.f. 01 Oct 17 in Nov 2017. It will
considering ease for mobility to all naval commands pave the path to identify
and outside repair/service agents. Earlier it was only defects in earlier stage
Vibration Analysis that carried out by MTTU at SLN
Dockyard and after re-establishment at SLNS Mahasen to minimize the unforeseen failures in machineries.
MTTU is capable of conducting Vibration Analysis (VA), The instrument is capable of analyzing wear
Non Destructive Testing (NDT), Wear Down Metal metals concentration from 1 ppb to 1000 ppm. The
Analysis (WDA) and Thermal Inspection (TI). instrument is capable of obtaining multi elemental
results at a time. In a matter of five hours time you
Condition Based Predictive Maintenance
will be able to get a complete report.
Condition based monitoring can be referred as
Sample preparation and
an art, when quite clearly it is a science, and despites
sampling is a crucial part
the cost of machine, surprisingly little attention has
of this instrument. If you
been devoted to this science from the view point of
don’t perform correct
understanding and modeling failure mechanisms
sample preparation
and the study of probability to failure. Predictive
or your sample is not
maintenance technique has now become common
extracted from proper locations, correct conditions
exercises as they maximize the machine availability time
or by skilled person the information which the end
and minimize the cost of maintenance, since the machine
user receive may not be correct and may differ
can be stopped just before as impending problem in an
results. Hence, all MTTU customers are intimated to
other wise healthy machine, Wear Metal Analysis has
follow correct sampling procedures.
proven useful in providing supporting evidence on the
machinery failure.
The trend analysis of machinery wear metal
Wear Metal Analysis deviation in proportionate with the running hours
Wear of sliding is very important to monitor the behavior of the
components machine. There is only four number of similar type of
result in redu- machinery in operation within Sri Lanka at present.
ced mechanical SLN is proud to be one among them, which earns a
efficiency and great reputation among technical laboratories and
an irretrievable thus uplift SLN image as a standardized maintenance
loss of material provider for own ships/ craft.
in the form
of wear debris. Wear at the interface between moving Source : Thermo
particles is a normal characteristic of machine operation. scientific ICP-OES
The kind and rate of wear depend on the machine type. technology and various
Lubrication is provided between the moving surface internet articles.
to minimize the wear but during operations millions
minute wear particles entering the lubricating oil. These
particles are in suspension in the oil, larger particles may Note : This article is the first article by MTTU
be trapped by filter while others generally too small to be
staff written on CBPM techniques. Next will be on
removed, remain in suspension in the circulating oil. Wear “Vibration Analysis”.
metals testing in lubricants, oils and other machine fluids
helps clients avoid expensive damage and downtime to
ERA III EAML Edirisinghe
high value engines, gears, generators, turbines and other
AE 104193
important equipment.