Efficient Plant November 2017 - 24

feature | controlling flow
Fig. 1. One of the best
ways to add automation
to an existing system
is to use an actuator
instead of a hand-wheel
and operate the valve
with a control cabinet,
as shown here. Using a
cabinet for local control,
an Ethernet wire is
all that's needed to
ensure communication
throughout the facility.

types of sensors that the automated controls will rely
on for system feedback. Temperature, turbidity, flow,
and pressure are common measurements in a water
facility. Once a sensor inventory is completed, note
which are critical for operation, those that are required for safe operation, and which may be luxuries.
With this list, a minimum and maximum requirement
for the inputs and outputs (I/O) can be determined.
Different types of systems can be configured to allow
expansion.
Sensors can be used as triggers to initiate a sequence of events or a single operation in an automated system. For example, a sensor may indicate to the
controller-typically a programmable logic controller
(PLC)-that the pressure is too low and that a filter
may be clogged. This can cause the system to pause
the operation until the filter is replaced. When the
sensor indicates an acceptable pressure level, the PLC
can notify an operator or automatically turn on the
flow.
In addition to pressure measurements, other operations can include a sequence of automated valves
opening and closing based on time, level, tempera-

24

| EFFICIENTPLANTMAG.COM

ture, and water condition. A likely scenario begins
with a large butterfly valve providing the water to the
system. This valve may be operated manually as it is
opened at the beginning of the day and closed at the
end, or that same valve may be automatically opened
and closed. The water passing through the butterfly
valve is then transported to a filtration skid or preparation equipment before it's diverted to another area
of the plant.
Depending on the required filtration, multiple
valve-actuator assemblies are likely to be installed,
and they can be controlled by a PLC in a control
cabinet. These valves will divert the water through
multiple filtration assemblies. Such systems are often
configured to remove large particles first and smaller
particles afterwards.

VALVE ASSEMBLIES
With many automated-valve configurations, including
pneumatic and electrical signals, a short run of wires
to the control cabinet can save costly installation and
difficult, time-consuming troubleshooting time if an
open circuit becomes an issue (Fig. 2). Using a cabinet

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
https://www.nxtbook.com/atp/MaintenanceTechnology/efficient-plant-jan-feb-2024
https://www.nxtbook.com/atp/MaintenanceTechnology/efficient-plant-april-2022
https://www.nxtbook.com/atp/MaintenanceTechnology/efficient-plant-october-2021
https://www.nxtbook.com/atp/MaintenanceTechnology/efficient-plant-june-2021
https://www.nxtbook.com/atp/MaintenanceTechnology/epapril2021
https://www.nxtbook.com/atp/MaintenanceTechnology/epmarch2021
https://www.nxtbook.com/atp/MaintenanceTechnology/epjanfeb2021
https://www.nxtbook.com/atp/MaintenanceTechnology/epjulyaug2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epjune2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epmay2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epapril2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epmarch2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epfeb2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epjan2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epnovdec2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epseptoct2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epmay2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epapril2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epmarch2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epfebruary2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epjanuary2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epdecember2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epnovember2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epoctober2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epseptember2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epaugust2018
https://www.nxtbook.com/atp/MaintenanceTechnology/0818schneider
https://www.nxtbook.com/atp/MaintenanceTechnology/epjuly2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epjune2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epmay2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epapril2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epmarch2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epfebruary2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epjanuary2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epdecember2017
https://www.nxtbook.com/atp/MaintenanceTechnology/epnovember2017
https://www.nxtbook.com/atp/MaintenanceTechnology/epoctober2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtsept2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtaugust2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjuly2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjune2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtmay2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtapril2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtmarch2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtfebruary2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjanuary2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtdecember2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtnovember2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtoctober2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtseptember2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtaugust2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjuly2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjune2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtmay2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtapril2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtmarch2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtfebruary2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjanuary2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtdecember2015
https://www.nxtbook.com/atp/MaintenanceTechnology/mtnovember2015
https://www.nxtbook.com/atp/MaintenanceTechnology/mtoctober2015
https://www.nxtbook.com/atp/MaintenanceTechnology/mtseptember2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTAugust2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTJuly2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTJune2015
https://www.nxtbook.com/atp/MaintenanceTechnology/M
https://www.nxtbook.com/atp/MaintenanceTechnology/0415endress
https://www.nxtbook.com/atp/MaintenanceTechnology/MTApril2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTMarch2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTFebruary2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTJanuary2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTDecember2014
https://www.nxtbook.com/atp/MaintenanceTechnology/MTNovember2014
https://www.nxtbook.com/atp/MaintenanceTechnology/MTOctober2014
https://www.nxtbook.com/atp/MaintenanceTechnology/MTSeptember2014
https://www.nxtbook.com/atp/MaintenanceTechnology/MTAugust2014
https://www.nxtbook.com/atp/MaintenanceTechnology/MTJuly2014
https://www.nxtbookmedia.com