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8
YVIB Vibration Monitor Modules
8.1 Mechanical Vibration Standards
ISO 7919-4:2009 provides the standard for evaluation of machine vibration by measurements on the rotating shafts. The
broad-band vibration is measured radially or transverse to the shaft axis of the Heavy Duty Gas Turbines (HDGTs) with
fluid-film bearings. The frequency range is from one hertz to three times the maximum normal operating frequency.
Eddy-current transducers are located orthogonal to each other, pointed radially at the shaft. Traditionally, either narrow-band
or spectral analysis is used to monitor the mechanical vibration. The typical peak-to-peak, relative-vibration displacement
values for a newly commissioned 3600 rpm machine is 3.15 mils.
ISO 10816-4:2009 defines a standard for the evaluation of machine vibration by measurements on the non-rotating parts. The
broad-band vibration is measured radially or transverse to the shaft axis on all main bearing housings or pedestals and in the
axial direction on thrust bearings. The measurement system must be capable of measuring broad-band vibration over a
frequency range from 10 hertz to at least 500 hertz or six times the maximum normal operating frequency, whichever is
greater. The common measurement parameter for assessing machine vibration severity is the broad-band root mean square (r.
m.s.) velocity measurement. The vibration consists mainly of one frequency component, which is the rotating frequency.
Typical values for bearing housing or pedestal vibration velocity for a newly commissioned gas turbines is 0.177 inches / sec.
Sensor
Measure
Tag
S
Seismic vibration
V
X-Y radial vibration
Dual axial
D
displacement
A
Accelerometer
KeyPhasor
Kf
YVIB Vibration Monitor Modules
Index for Application Diagrams
Sensor Type
Metrix 5486C-008
Bently Nevada 330101
(3300 XL 8mm probe)
(3300 Proximity
Bently Nevada 330101
(3300 XL 8mm probe)
(3300 Proximity
Bently Nevada
330400-01-05
Bently Nevada 330101
(3300 XL 8mm probe)
(3300 Proximity
Public Information
Prox. Type
Function
Monitoring &
N/A
Protection
Bently Nevada
330100
Monitoring &
Protection
transducer)
Bently Nevada
330100
Monitoring &
Protection
transducer)
Monitoring
N/A
Bently Nevada
330100
Monitoring
transducer)
GEH-6855_Vol_II System Guide 227
Sensor Filter
Capability
10 – 1000 Hz
5 – 1200 Hz
N/A
10 – 20000 Hz
N/A
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