Efficient Plant November 2017 - 32

feature | pdm solutions

Fig 2. The Yokogawa wireless vibration-monitoring system consists of a piezo-electric vibration sensor connected to a host system by way of a wireless mesh network. The sensor can be mounted using
a pedestal screwed to the equipment, i.e., target device, housing (in this case, a motor's housing),
usually near the bearings.

While vibration
can't be
eliminated
entirely, it can
be measured
and analyzed
to guide
corrective
actions.

32

| EFFICIENTPLANTMAG.COM

which has a variety of causes, is one of the
greatest enemies of rotating equipment.
"Consider," he said, "a typical ANSI
pump driven by a motor with a flexible
coupling. If the two shafts aren't truly on a
common centerline, the coupling will compensate for the misalignment, but it will
likely introduce vibration into the installation. Vibration creates detrimental forces
within the ball bearings, causing premature
wear, which further increases the overall
vibration. Over a long-enough period of
time, the problem will compound until one
or more of the bearings fail. The pump's
mechanical seals may also suffer damage
and begin to leak. Before long, the installation must be shut down and overhauled."

In addition to the vibration inherent
with any rotating equipment, at least at
some level, potentially harmful vibration
can also be transmitted by way of piping
and support structures from other machinery within the process unit. The good news
is that, while vibration can't be eliminated
entirely, it can be measured and analyzed to
guide corrective action.
Sensors are available to characterize
and quantify the amount of vibration, and
to capture characteristic patterns, often
referred to as signatures. These monitoring
systems typically use a piezo-electric sensor
to create and transmit a signal proportional
to measured vibration.
Vibration sensors have been available for
many years, but older systems were costly
to install, limiting their deployment to the
most expensive and critical rotating equipment. For other installations, technicians
have carried portable units on routine plant
inspections and manually checked bearings, seals, and other critical points.
According to Yamamoto, sophisticated
portable systems can capture historical
information and compare specific installations over time, but such rounds also can
be time-consuming and, ultimately, costly.
"Furthermore," he noted, "in plants with
minimal head counts, they can be delayed
or skipped when more pressing tasks
emerge."

ADVANTAGES OF
CONTINUOUS MONITORING
Short of a catastrophic failure of some
component, vibration problems don't
usually advance drastically in a brief period
of time. This fact is usually cited to support
the idea of periodic inspections. "Unfortunately," Yamamoto explained, "vibration
problems may increase slowly until they
reach a critical point, and then the climb
becomes much steeper toward failure, all
of which can easily occur before the next

NOVEMBER 2017


http://www.EFFICIENTPLANTMAG.COM

Table of Contents for the Digital Edition of Efficient Plant November 2017

Efficient Plant November 2017 - 1
Efficient Plant November 2017 - Cover1
Efficient Plant November 2017 - Cover2
Efficient Plant November 2017 - 1
Efficient Plant November 2017 - 2
Efficient Plant November 2017 - 3
Efficient Plant November 2017 - 4
Efficient Plant November 2017 - 5
Efficient Plant November 2017 - 6
Efficient Plant November 2017 - 7
Efficient Plant November 2017 - 8
Efficient Plant November 2017 - 9
Efficient Plant November 2017 - 10
Efficient Plant November 2017 - 11
Efficient Plant November 2017 - 12
Efficient Plant November 2017 - 13
Efficient Plant November 2017 - 14
Efficient Plant November 2017 - 15
Efficient Plant November 2017 - 16
Efficient Plant November 2017 - 17
Efficient Plant November 2017 - 18
Efficient Plant November 2017 - 19
Efficient Plant November 2017 - 20
Efficient Plant November 2017 - 21
Efficient Plant November 2017 - 22
Efficient Plant November 2017 - 23
Efficient Plant November 2017 - 24
Efficient Plant November 2017 - 25
Efficient Plant November 2017 - 26
Efficient Plant November 2017 - 27
Efficient Plant November 2017 - 28
Efficient Plant November 2017 - 29
Efficient Plant November 2017 - 30
Efficient Plant November 2017 - 31
Efficient Plant November 2017 - 32
Efficient Plant November 2017 - 33
Efficient Plant November 2017 - 34
Efficient Plant November 2017 - 35
Efficient Plant November 2017 - 36
Efficient Plant November 2017 - 37
Efficient Plant November 2017 - 38
Efficient Plant November 2017 - 39
Efficient Plant November 2017 - 40
Efficient Plant November 2017 - 41
Efficient Plant November 2017 - 42
Efficient Plant November 2017 - 43
Efficient Plant November 2017 - 44
Efficient Plant November 2017 - 45
Efficient Plant November 2017 - 46
Efficient Plant November 2017 - 47
Efficient Plant November 2017 - 48
Efficient Plant November 2017 - 49
Efficient Plant November 2017 - 50
Efficient Plant November 2017 - 51
Efficient Plant November 2017 - 52
Efficient Plant November 2017 - 53
Efficient Plant November 2017 - 54
Efficient Plant November 2017 - 55
Efficient Plant November 2017 - 56
Efficient Plant November 2017 - Cover3
Efficient Plant November 2017 - Cover4
http://www.nxtbook.com/atp/MaintenanceTechnology/epfeb2020
http://www.nxtbook.com/atp/MaintenanceTechnology/epjan2019
http://www.nxtbook.com/atp/MaintenanceTechnology/epnovdec2019
http://www.nxtbook.com/atp/MaintenanceTechnology/epseptoct2019
http://www.nxtbook.com/atp/MaintenanceTechnology/epmay2019
http://www.nxtbook.com/atp/MaintenanceTechnology/epapril2019
http://www.nxtbook.com/atp/MaintenanceTechnology/epmarch2019
http://www.nxtbook.com/atp/MaintenanceTechnology/epfebruary2019
http://www.nxtbook.com/atp/MaintenanceTechnology/epjanuary2019
http://www.nxtbook.com/atp/MaintenanceTechnology/epdecember2018
http://www.nxtbook.com/atp/MaintenanceTechnology/epnovember2018
http://www.nxtbook.com/atp/MaintenanceTechnology/epoctober2018
http://www.nxtbook.com/atp/MaintenanceTechnology/epseptember2019
http://www.nxtbook.com/atp/MaintenanceTechnology/epaugust2018
http://www.nxtbook.com/atp/MaintenanceTechnology/0818schneider
http://www.nxtbook.com/atp/MaintenanceTechnology/epjuly2018
http://www.nxtbook.com/atp/MaintenanceTechnology/epjune2018
http://www.nxtbook.com/atp/MaintenanceTechnology/epmay2018
http://www.nxtbook.com/atp/MaintenanceTechnology/epapril2018
http://www.nxtbook.com/atp/MaintenanceTechnology/epmarch2018
http://www.nxtbook.com/atp/MaintenanceTechnology/epfebruary2018
http://www.nxtbook.com/atp/MaintenanceTechnology/epjanuary2018
http://www.nxtbook.com/atp/MaintenanceTechnology/epdecember2017
http://www.nxtbook.com/atp/MaintenanceTechnology/epnovember2017
http://www.nxtbook.com/atp/MaintenanceTechnology/epoctober2017
http://www.nxtbook.com/atp/MaintenanceTechnology/mtsept2017
http://www.nxtbook.com/atp/MaintenanceTechnology/mtaugust2017
http://www.nxtbook.com/atp/MaintenanceTechnology/mtjuly2017
http://www.nxtbook.com/atp/MaintenanceTechnology/mtjune2017
http://www.nxtbook.com/atp/MaintenanceTechnology/mtmay2017
http://www.nxtbook.com/atp/MaintenanceTechnology/mtapril2017
http://www.nxtbook.com/atp/MaintenanceTechnology/mtmarch2017
http://www.nxtbook.com/atp/MaintenanceTechnology/mtfebruary2017
http://www.nxtbook.com/atp/MaintenanceTechnology/mtjanuary2017
http://www.nxtbook.com/atp/MaintenanceTechnology/mtdecember2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtnovember2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtoctober2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtseptember2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtaugust2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtjuly2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtjune2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtmay2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtapril2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtmarch2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtfebruary2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtjanuary2016
http://www.nxtbook.com/atp/MaintenanceTechnology/mtdecember2015
http://www.nxtbook.com/atp/MaintenanceTechnology/mtnovember2015
http://www.nxtbook.com/atp/MaintenanceTechnology/mtoctober2015
http://www.nxtbook.com/atp/MaintenanceTechnology/mtseptember2015
http://www.nxtbook.com/atp/MaintenanceTechnology/MTAugust2015
http://www.nxtbook.com/atp/MaintenanceTechnology/MTJuly2015
http://www.nxtbook.com/atp/MaintenanceTechnology/MTJune2015
http://www.nxtbook.com/atp/MaintenanceTechnology/M
http://www.nxtbook.com/atp/MaintenanceTechnology/0415endress
http://www.nxtbook.com/atp/MaintenanceTechnology/MTApril2015
http://www.nxtbook.com/atp/MaintenanceTechnology/MTMarch2015
http://www.nxtbook.com/atp/MaintenanceTechnology/MTFebruary2015
http://www.nxtbook.com/atp/MaintenanceTechnology/MTJanuary2015
http://www.nxtbook.com/atp/MaintenanceTechnology/MTDecember2014
http://www.nxtbook.com/atp/MaintenanceTechnology/MTNovember2014
http://www.nxtbook.com/atp/MaintenanceTechnology/MTOctober2014
http://www.nxtbook.com/atp/MaintenanceTechnology/MTSeptember2014
http://www.nxtbook.com/atp/MaintenanceTechnology/MTAugust2014
http://www.nxtbook.com/atp/MaintenanceTechnology/MTJuly2014
http://www.nxtbookMEDIA.com