Modern Pumping Today November 2024 - 22

SEALING SOLUTIONS
VALVE STATION PLANNING 101
From sizing to customization to layout,
here's what you need to know: Part 2 of 2
BY MARK GIMSON, CLA-VAL
I
n the first part of this series, we
addressed some of the basics of
effective valve station planning.
Continuing in that mold, let's take
a look at different customization
options and the practical design
considerations to consider before a
valve station is installed.
CONSIDERING
OTHER OPTIONS
A valve position indicator is very
useful for operations personnel
as it gives the ability to see the
exact position of the valve during
operation. If a remote signal is
required this can be upgraded to
a position transmitter, supplying
a 4-20 mA signal via SCADA or a
limit switch can be added to give
an output for a position transmitter.
Pressure transmitters can be added
to give 4-20mA signals for both inlet
and outlet pressures. This option is
useful if the intention is to utilize a
pressure management program in
the future.
Also, consider options to give more
system control. A second pilot control
can be added to give the ability to
have upstream pressure sustaining.
This is very useful in situations
where there is a need to protect
the upstream from being starved
of pressure by high downstream
demand. If downstream surge could
be an issue, a downstream surge
pilot can be added to the reducing
valve that will close the control valve
quickly should the downstream
pressure rise slightly above the
pressure reducing pilot set point.
Some manufacturers will offer
package solutions, for example,
the Cla-Val Model XP2F offers
full instrumentation that includes
upstream pressure, downstream
pressure, valve position,
instantaneous flow, and totalized flow.
When deployed across the system
network the XP2F package allows for
insight into pressure, leakage, flow
and system distribution management.
The inlet pressure, outlet pressure,
www.mptmag.com
See
Part 1
Accessory packages like the Cla-Val Model XP2F is
a complete instrumentation accessory package.
valve position, flow, and totalized flow
can be retransmitted to SCADA or
the AMI System and logged to the
internal SD Card.
The possibilities of the additions
are numerous and specific
requirements should be discussed
with the control valve supplier to
ensure you get the full benefit of all
that is available.
A well planned out valve station, has good access for maintenance.
22 | NOVEMBER 2024
MPT
DESIGN LAYOUT OF THE
VALVE STATION
There are some key items that
every valve station requires,
namely isolating valves, upstream
and downstream of the control
valves. These are required to allow
maintenance for isolating the control
valve when it is necessary to work on
the control valve. These valves can be
either butterfly valves or gate valves
and can be installed with handwheels
or operating nuts depending on
whether it is required to operate
these valves from above ground.
Most utilities will use non-rising stem
gate valves as these are the valves
that are typically located throughout
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Modern Pumping Today November 2024

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