GE Mark VIeS - 8 YVIB Vibration Monitor Modules

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.
Index for Application Diagrams
Sensor
Tag
Measure
Sensor Type Prox. Type
Function
Sensor Filter
Capability
S Seismic vibration Metrix 5486C-008 N/A
Monitoring &
Protection
10 – 1000 Hz
V X-Y radial vibration
Bently Nevada 330101 Bently Nevada
Monitoring &
Protection
5 – 1200 Hz
(3300 XL 8mm probe)
330100
(3300 Proximity
transducer)
D
Dual axial
displacement
Bently Nevada 330101 Bently Nevada
Monitoring &
Protection
N/A
(3300 XL 8mm probe)
330100
(3300 Proximity
transducer)
A Accelerometer
Bently Nevada
N/A
Monitoring
10 – 20000 Hz
330400-01-05
Kf
KeyPhasor
Bently Nevada 330101 Bently Nevada
Monitoring
N/A
(3300 XL 8mm probe)
330100
(3300 Proximity
transducer)
YVIB Vibration Monitor Modules GEH-6855_Vol_II System Guide 227
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