Purpose-
The
Procedures for Vibration monitoring activities has
been conceived as a reference for the person who involved directly or indirectly in this activity. It gathers schedules
of vibration monitoring, standard formats and reporting culture.
Objective –
The objectives
of
the procedures
for Preventive maintenance Activities
can be summarized as follows:
v Maintenance
carried out at predetermined intervals and intended to reduce the probability of
failure or the performance degradation of an item.
v Regular and systematic inspection, cleaning, and replacement of worn parts, materials, and systems
v Actions that detect preclude or mitigate degradation of a functional structure, system or component to sustain or extend its
useful life
by controlling degradation
and
failures
to an acceptable level.
v The
care and servicing by personnel for
the
purpose of maintaining equipment and
facilities in satisfactory operating condition by providing for systematic inspection, detection, and correction of incipient failures
either before they occur or before they develop into major defects.
Safety-
As in every
aspect of Maintenance, Safety comes first.
1. No
loose clothing
or loose gloves will be worn.
2. Beware
of all rotary shafts, bearing collars and movement.
3.
Beware of start-up and stopping forces; energy is very
high.
4. Standard
PPE (Personal Protective Equipment)
will be worn.
5. Hearing protection will
be used where required by company or need has been determined by technician.
6. Muffling head sets will be used in locations where numerous high noise levels are present, at the discretion of technician.
The Procedure consist of following cycle-
1.
Scheduling of Activity
2. Uploading of Route from analyzer software to vibration analyzer
(FFT)
3. Data Collection from site
4. Analysis against standard parameters
5. Report Creation
6. Communication with
other departments
7.
Rechecking
1.
Scheduling of Activity –
Scheduling defines
the timing of work,
and
when this
work will be done. Before scheduling the equipments, first we identified the equipments for vibration analysis. And
The
following are created which are briefly described in following Annexure-a) Vibration routes
Scheduling _Annexure 1 – All equipments
has
divided
into routes
according to the sections.
2.
Uploading of Route from
analyzer software to vibration analyzer
3.
Data Collection from
site- Measurement should be taken from same point at every time for that proper marking should be done. Vibration points
(H,V &A) are marked at each equipments
as per guidelines.
Acceleration = g’s rms. or peak
Velocity = inch/s rms. or peak
Displacement = mils peak to peak
Points to be remember –
Select the
best measurement point on the machine. Avoid painted surfaces, unloaded bearing zones, housing splits, and structural gaps.
When measuring vibration with a hand-held sensor,
it is imperative that you perform consistent readings, paying close attention to the sensor’s
position on the machinery, the
sensor’s angle to the machinery, and the contact pressure with which the
sensor is held on the machinery.
Use accelerometer of 100mv/g.
Marking the sensor placement location & always use these points for
data
collection.
- Pk-Pk / 2 = Peak
- Peak x 0.707 = RMS (Peak / 1.414 = RMS)
- RMS x 1.414 = Peak (RMS / 0.707 = Peak)
- Peak x 2 = Pk-Pk
4.
Analysis against standard parameters –
After data collection, collected data is compare with the standard values. For vibration measurement,
we follow ISO 10816-1 1995 (former ISO 2372)
standard that is more or less identical with DIN 45665 or the VDI 2056 guide line.
5.
Report Creation –
After analysis, we create analysis
report .We have a standard vibration
report format. If in analysis
we
found some
abnormality we send a analysis report to concern department. Always
use
standard vibration analysis report.
6.
Rechecking -
After correction of problem we again check the equipment to ensure
the
rectification of problem.
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