Friday, July 13, 2012
Mechanical (Rotary) Common Questions -7
EPC-School 2012
M for Mechanical
Topic - Condition Monitoring
M for Mechanical
Topic - Condition Monitoring
1. What are the various
maintenance approaches for rotating equipment?
3. What is the allowed vibration
limit for pumps for process plants?
4. What are the online vibration
instruments used on a reciprocating compressor?
5. What are the online vibration
instruments used on a high speed centrifugal compressor?
6. Which instrument is used to
measure vibration on an antifriction bearing/gear box?
7. What is critical speed for a
rotary machine?
8. At natural
frequency of a machine, vibration increases suddenly/increases
steadily/decreases/steady?
9. In what units
is vibration velocity measured?
10. In what units is vibration
acceleration measured?
11. What are the different units
for frequency?
12. Centrifugal force created by
unbalance is proportional to
13. What is the purpose of the key
phaser?
14. What are the different trip
logics used in refinery? .
15. What is the
principle of operation of a proximity probe?
16. Of what make
is the MCMS system in petro plants generally?
17. Name some non contact type and contact
type transducers?
18. What are the
three parameters that describe a vibration signal?
Answers to Above Questions-
1. Breakdown maintenance, Preventive maintenance, Predictive
maintenance, Condition monitoring
2. Vibration is defined as the to and fro motion of a body
from its mean position.
Measured in
displacement(mm), velocity(mm/sec) and acceleration (mm/sec2)
3. 7 mm/sec pk to pk
4. Velocitymeter on shaft bearings, proximity transducers
for rod drop
5. Radial position proximity transducers near bearings,
axial position transducers on thrust collar
6. Accelerometer
7. It is the speed at which the natural frequency of the rotor
assembly matches the rotating shaft frequency
8. Increases suddenly
9. mm/sec
10. mm/sec2, ‘g’ value
11. Hz, cycle per min
12. Mass, radius, square of angular velocity
13. Speed measurement
14. 1out of 1 (1oo1), 2oo2, 2oo3
15. It detects change in relative position of probe and
shaft using eddy current generation principle
16. Bentley Nevada ,
DM 3500
17. Contact: velometer, velocitymeter, accelerometer, RTD,
thermowel, mechanical tachometer
Non contact:
proximity probe, optical tachometer, stroboscope, magnetic pick up
18. Amplitude, frequency, phase
Labels: EPC School, frequency, gear box, key phaser, MCMS, mechanical, Rahul Kapoor, rotary, velocity measurement, vibration, vibration acceleration
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