Hydrocarbon Processing - September 2021 - 85

MIKE RHODES, MANAGING EDITOR
Mike.Rhodes@HydrocarbonProcessing.com
Innovations
ARCS for increased
operational certainty in
emergency shutdown
situations
Emerson has released its ASCO™ 141
Series Advanced Redundant Control
System (ARCS) to provide a redundant
solution for a variety of emergency shutdown
valve applications, such as those
found in the chemical, power, oil and
gas industries. Available globally, the system
(FIG. 1) includes various redundant
solenoid configurations to enhance the
reliability of the process and meet specific
safety or reliability requirements in
automation processes. The single-inlet/
single-outlet design provides a streamlined
installation process compared to
traditional bypass systems, while almost
eliminating potential failure points.
The ASCO 141 series ARCS is designed
for use as a component in safety
instrumented systems. Utilizing 1oo2,
2oo2 or 2oo3 voting solenoids to enhance
the reliability of the circuit, it functions as
a redundant pneumatics tripping device
to control the pilot air signal to a process
valve actuator. The ARCS features either
two or four electrically actuated solenoid
valves, visual indicators and a manually
controlled bypass or isolation valve. The
unique control functionality allows for
maintenance of the solenoid valves without
having to shut down the process valve.
In fact, the use of the maintenance bypass
or isolation valve is not required for functional
testing of the ARCS unit-a downtime-reducing
feature not possible with
common bypass functions.
With just a single part number, the
ASCO 141 series ARCS features several
advances that simplify specification, installation
and operation. Supplied as a fully
integrated, comprehensive solution using
a manifold instead of individual valves,
ARCS comes pre-tested from the factory
and ready to install. The direct valve-tovalve
design eliminates pipework and fittings
between the solenoid valves and minimizes
leak points for increased reliability
and a lower total cost of ownership. A status
indicator with feedback helps facilitate
preventive maintenance while providing
online fault detection. It provides digital
input feedback (via pressure switches or
Emerson-exclusive GO Switch options)
to the control room. For additional peace
of mind, the ASCO™ 327 series 3/2-way
direct acting solenoid valves included on
the ARCS manifold are certified to SIL 3
capable (exida) standards.
Natural gas analyzer
SpectraSensors, an Endress+Hauser
company, has released its J22 TDLAS
gas analyzer. This new product addresses
multiple issues with traditional technologies
used for the measurement of moisture
content in natural gas, while providing
additional benefits.
Gas suppliers, pipeline operators and
industrial users must accommodate unexpected
changes in heating value and
contaminant levels by using analyzers to
verify characteristics throughout the supply
chain. One critical contaminant must
be monitored continuously: H2
O. The
presence of water content in liquid or gas
can cause corrosion in a pipeline or other
assets. Moisture and other acids can combine
to cause severe asset degradation.
The J22 moisture analyzer (FIG. 2)
combines Endress+Hauser's and SpectraSensors'
more than two decades of experience
producing tunable diode laser analyzers
with the latest advancements in data
analysis, internal diagnostics, multi-functional
enclosures and web server connectivity.
The combination of these features
creates a comprehensive moisture monitoring
solution with unique capabilities.
The analyzer can replace traditional
electrochemical sensors, such as aluminum
oxide, phosphorus pentoxide, quartz
crystal microbalance and chilled mirror.
These technologies often lose accuracy
due to contamination issues, require frequent
maintenance and cannot reliably
distinguish between water and other liquids
frequently found in gas streams, such
as glycol and methanol.
TDLAS technology can identify the
water molecules specifically, while being
unaffected by a wide variety of other
common contaminants. However, some
traditional TDLAS analyzers are difficult
to maintain and not suited to installation
in harsh environments.
To address these and other issues, the
J22 TDLAS gas analyzer is designed for
almost zero maintenance. When service is
required, its components are easily accessible
and field-serviceable, allowing for
quick replacements and upgrades. The
gas sample cell is simple to remove and
designed for convenient cleaning and servicing.
The available IP66 and Type 4X
enclosures for housing the analyzer system
are suitable for installation in typical
natural gas application locations.
Field operability is made easier thanks
to Endress+Hauser's Heartbeat TechnoloFIG.
1. Emerson's ASCO™ 141 Series Advanced
Redundant Control System (ARCS).
FIG. 2. SpectraSensors, an Endress+Hauser
company, has released its J22 TDLAS
gas analyzer.
Hydrocarbon Processing | SEPTEMBER 2021 85
Hydrocarbon Processing - September 2021

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