Monarch Instrument EXAMINER 1000 - Manual (Page 9)

6
Selecting Machinery and Measurements
Maintenance personnel have always made visual and hands-on inspections of their
machinery on a periodic basis. Systematic data collection and trending allows for
recall and comparison of events over time but is not a replacement for good
maintenance practices. Collecting machinery data is an aid to the maintenance
professional, which is used in addition to good maintenance practices.
Selecting and Classifying Machinery
Setting up an effective Predictive Maintenance Program requires a careful study of
the needs of the plant. It is necessary to know each machine and its response to
change. The following is an example of machinery classification:
Critical Machines expensive premium equipment, generally >500 HP. Usually
less than 5% of all plant equipment. Maintenance dollars per horsepower per year
average $11.00. This category of equipment is very well maintained and monitored.
Continuous monitoring systems are better suited for this type of equipment.
Essential Machines medium size equipment, 100-500 HP. This group may be 30-
40% of all the equipment in the plant. Maintenance costs can average $22.00 per
horsepower per year. Less attention is paid to these machines even though their
repair costs can be as high as critical machines. Select some of these machines for
your Predictive Maintenance Program.
Redundant Machines small redundant equipment usually < 100 HP. This group
can be as much as 50% of all machines in a plant and yet they are usually neglected.
By far the most expensive to maintain at $49.00/HP/year, this group will benefit
the most from Predictive Maintenance practices. At many facilities, this group
consumes 80% of the annual maintenance budget. If you want to have an immediate
impact begin with these machines. Also include machines with known problems or a
history of problems. Personnel Safety is always the first priority in selecting
machinery to monitor.
CRITICAL
ESSENTIAL
REDUNDANT
Machine Identification Water Pump #707
Machine Description AC motor 1800 RPM, flexible
coupling, 3 vane pump. CAUTION HOT WATER!!!
Date Point Direction Type Value
Jan 2 1999 A V V 0.06 in/s
Jan 2 1999 A H V 0.04 in/s
Jan 2 1999 A X V 0.03 in/s
Jan 2 1999 B V V 0.07 in/s
Jan 2 1999 B H V 0.05 in/s
Jan 2 1999 B V Env 0.001 ge
Establishing a Data Collection Route
The Machinery Data Worksheet helps organize data for routine data collection.
Vibration readings are taken on the Points (bearings) established in your route and
recorded using your naming convention on the worksheet. Vibration, speed,
temperature, pressure or any process data may be recorded using this type of
systematic approach.
Steps for Route collection
1. Determine the machines which require data collection.
2. Define each measurement type for data collection Points on each Machine.
Several Points will have numerous readings i.e. VEL and ENV and Temp.
3. Establish a Route with the Machines grouped by physical location.
4. Walk the Route, collecting and recording data for each Point.
5. Transfer data values to your On-Time Trending software.
Recording Data for a Machine
1234567
1234567
1234567
1234567
1234567
1234567
1234567
12345
12345
12345
12345
12345
12345
12345
12345
12345
B C D
MOTOR PUMP
A
The vibration sensor is
placed on each data
collection Point. The
Point, direction of the
sensor and the value are
recorded on the
Machinery Data
Worksheet.
Point AVV is
taken on the
outboard end of
the motor, in the
vertical position
with a velocity
type reading.
AHV -Point A in
the horizontal
position with a
Velocity type.
example of Machinery Data Worksheet
9