System monitors gas turbine vibration
A refinery relying on a gas
turbine-driven generator to provide power recently installed a
DAQ vibration-monitoring data logger from CAS DataLoggers
(Fig. 1) as a condition-monitoring solution.
The data logger allows users to schedule downtime for
maintenance and avoid power interruptions. The facility uses an
older generator that has begun to develop vibrations in its
shafts and bearings, causing fatigue failures. Users needed to
acquire process data from the turbine, including temperature,
pressure, flowrate and RPM data.
1. The DAQ vibration-
monitoring data logger from
CAS DataLoggers allows users to schedule
for maintenance and avoid
The refinery installed a data
acquisition and control system into the control cabinet
adjacent to the turbine. The systems eight synchronous
analog inputs enable universal connections for accelerometers
and displacement sensors at sampling rates of up to 50 kHz per
channel. The system also features four analog outputs and eight
digital outputs for monitoring. Integrated comparators for
keyphasor sensors and four digital inputs are also included to
enable flexible triggering. All channels are galvanically
The DAQ systems 24-bit analog-to-digital converter
ensures precise measurements, while its dual-core
field-programmable gate array processor provides it with ample
power for online computations and analysis. The touchscreen
display shows configuration and measurement data.
The data logger is connected to the control rooms
programmable logic controller to continuously acquire pressure
vibrations, as well as turbine process data. The system has its
own internal data storage capability, and its memory can record
raw time signals, along with spectra and characteristic
The data loggers local area network interface gives
users access from any authorized computer on the network.
Analysis of online/offline measurement data is performed from a
desktop computer. The system also sends the data online via the
refinerys ethernet network so that the generators
manufacturer can view the data offsite.
Vibration analysis software
The system utilizes analysis software for data acquisition,
vibration analysis, visualization and automation. Refinery personnel chose an option
that enables recordkeeping and statistical functions. Users can
portray online and offline fast Fourier transform, cascade,
time-signal and orbit diagrams, and monitor and evaluate both
vibration and process data.
The software is modular and scalable. Data is monitored on
the fly, with digital outputs switching within milliseconds in
the event of limit-value violations. Time signal processing and
characteristic curve computations take place directly within
the hardwares digital signal processing. Users can access
and analyze both online and archived data at any time, and the
software also offers diagrams with a range of analysis
functions and customized documentation.
The DAQ system acts as the brain of this application as it
measures, monitors and records the vibration and process data
fully independently of a host computer. A single system
provides real-time monitoring, local data storage, alarming and
analysis. The data may then be manually evaluated or used with
the alarm-management option for automated and direct warnings
and alarms to personnel.
The system records even the smallest irregularity in the
data, so non-periodic signals can be precisely analyzed for
effective fault diagnostics. This reduces expensive processing
delays due to undiagnosed problems when a turbine fails.
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Bidirectional controller is first of its kind
Alicat Scientific Inc.s new MCD series bidirectional
mass flow and pressure controllers (Fig. 2)
precisely and rapidly control mass flowrate, volumetric
flowrate, and absolute pressure of gases in two flow
directions. This dual-valve design is the first of its kind,
accommodating process control requirements in gas analysis,
leak testing and environmental applications.
2. Alicat Scientific Inc.s
MCD series bidirectional
mass flow and pressure
controller has a dual-valve
design that is the first of its kind.
With a dedicated inlet valve and a dedicated exhaust valve, a
single MCD controller can control upstream and downstream
flows, as well as positive pressure or backpressure in both
open and closed systems. The controller is designed for
processes that require bidirectional flow control and/or
pressure control, as well as for pressure control in closed
systems, while also monitoring mass flow. User-selectable
control modes allow users to switch quickly between mass flow,
volumetric flow, and absolute pressure measurement and control
for maximum flexibility.
Alicats patented, internally compensated laminar
differential pressure measurement yields linear results over a
wide flow range. The resulting volumetric and mass flow data is
fully compensated for changes in pressure and temperature, and
corrected for the users standard temperature and
pressure. Available 0.4% accuracy, +0.2% full-scale
repeatability and less than 100-millisecond control response
times ensure top performance of gas flow processes.
The MCD series large, integrated display allows users
to access setpoint control and PID valve tuning without the
need for a computer. While it can operate as a standalone
device, it also comes with both analog and RS-232 digital
communications to integrate easily into process control
instrumentation. It comes with 30 field-selectable
calibrations, and it is available in full-scale mass flowrates
from −0.5/+0.5 standard cubic centimeters per minute to
−3,000/+3,000 standard liters per minute. All units are
backed by the National Institute of Standards and technology-traceable calibration,
comprehensive technical support and a lifetime warranty.
Select 2 at www.HydrocarbonProcessing.com/RS
Laser tracker system aids chemical processing
Hexagon Metrology recently announced its new handheld Leica
B-Probe laser tracker (Fig. 3) designed for
the inspection, alignment and assembly of large-scale machinery
and fabrications used in the chemical processing
3. Hexagon Metrologys
Leica B-Probe laser tracker is
designed for the inspection,
alignment and assembly of
chemical processing machinery.
The entry-level, wireless probing device extends the capability
of the Leica Absolute Tracker AT402, a portable measurement
system used to accurately measure and inspect in a radial
volume up to 1,050 ft. The wireless probe can be used to
inspect new construction or maintenance work on large assemblies
residing in a wide range of plants producing chemicals, paints,
plastics, household cleaning products and more.
Machine setup and downtime are reduced with the new laser
tracker-based probing system. The probes small footprint
and wireless functionality enable a trouble-free construction or repair process,
while other tasks are conducted simultaneously on the plant
The Leica B-Probe device works within a 32.8-ft (10-m)
radial distance from the AT402 tracker, offering greater
capabilities and flexibility over similar systems that have
fixed-base stations. The lightweight, 6.7-oz B-Probe tracker
features Ingress Protection 50 (IP5O) rating certification for
ingress protection against dust, and is AAA battery-powered.
The working range of this system can be multiplied with almost
no loss in probing accuracy by utilizing the move station
For larger parts or measurements that require higher
accuracies, a standard retroreflector can be used in
combination with the B-Probe tracker to take full advantage of
the AT402 trackers accuracy and the 525-ft radial
Select 3 at www.HydrocarbonProcessing.com/RS
New turbocompressor available for coking plants
Siemens Energy has continued to develop its STC-SOL
turbocompressor for coking industry applications. Now available
are a refined machine concept and new impeller technology, which render greater
compressor efficiency of up to 15%. Energy costs, representing
a primary component of operating costs, are reduced by the
Siemens has also significantly reduced the number of casing
components for the overall machine. The new STC-SOL
turbocompressor is now available for commercial operation.
The STC-SOL single-stage radial compressor combines Siemens
technology from existing compressor series with a new design.
The modernized impeller geometry has been used in other
applications with contaminated gases, such as in the sulfur
The compressor inlet chest and volute casing will be
fabricated from a single casting in the future. This reduces
the number of components, as additional transition sections are
no longer required. Siemens has reduced the number of casing
components from a total of seven to two, thereby enhancing the
safety and reliability of the overall machine.
The benefits of this reduction come into play in the coking
industry in particular, with fewer compressor surfaces that
require sealing against the contaminated and toxic gases used
in this industry. Also, the horizontal joint of the compact
compressor casing ensures short downtimes during plant maintenance.
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Fieldbus enhances Foundation specifications
The Fieldbus Foundation recently announced updates to its
open, non-proprietary Foundation Fieldbus technical
specifications. The new features will enhance the usability of
Foundation technology, with the goal of making
the digital Fieldbus automation experience easier than
conventional analog control systems.
The updated version of the Foundation specification includes
additional advanced support for Fieldbus device replacement and
backward compatibility, device description (DD) templates,
field diagnostics and alarm/alert integration. The ability to utilize
these enhanced features is included in the foundations
new Host Profile C, which is available for registration in
The new features in the Foundation technical specification
enable host and device suppliers to offer backward
compatibility to their users to simplify device replacement.
The incorporation of DD templates also provides an
interoperable way for instrumentation companies to offer a
variety of application settings for devices. Suppliers can
embed the templates in their DDs from the factory floor. This
function will make it faster and easier for end users to access
a correct offline configuration.
With the new device diagnostics alarm management feature,
hosts tested under Host Profile C must integrate field
diagnostics into alarm-management systems, rather than just
provide access to the information in a device view.
Application time support is also mandatory under Host
Profile C. This feature requires a timestamp capability in the
host system, which will start on an actual calendar date and
time. Additionally, a new standard dictionary update feature
requires that Fieldbus end users have the ability to install a
new dictionary update on their host system to support the
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Fire protection system boosts tunnel safety
Morgan Advanced Materials has announced the availability of
FireMaster FireBarrier 135 sprayed refractory cement, offering
cost-effective installation of fire protection. FireMaster
FireBarrier 135 is designed for concrete tunnel lining fire
protection and the fire protection of ventilation shafts,
escape tunnels and refuges, as well as critical systems such as
water mains and communication cables.
FireMaster FireBarrier 135 has been developed for the high
temperatures that may occur in tunnel fires. The cement can
withstand repeated and prolonged exposure to high temperatures,
and it can be installed onto concrete or metal substrates using
standard spray equipment and featuring very low spraying
wastage during installation. It is adhesive to most construction materials and can be
installed quickly, helping to reduce labor costs while
maintaining the final products quality and reliability.
FireMaster FireBarrier 135 has high adhesion
strengthtypically eight times its weightallowing
fixings to be attached directly to it. The cement can be
troweled flat to provide a high-quality surface finish that can
be used as the final tunnel lining surface (with optional
painting), avoiding the need for expensive secondary cladding.
The material can also be cast into sheet form and installed as
a dry board or shape for applications where spraying is not
Testing of FireMaster FireBarrier 135 per the
Rijkswaterstaat fire curve, and required by National Fire
Protection Association 502, has proven that the material
resists environmental conditions found in
tunnels. FireMaster FireBarrier 135 is resistant to water jet
sprays used to clean tunnel lining, and it will not spall when
subjected to water hose sprays at high temperature, increasing
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Radar tackles challenging liquids measurement
Invensys has introduced its Foxboro Eckardt LevelWave Radar
Series measurement solution for liquids, including corrosive,
sticky or difficult media. Each device has a 360° rotation,
which allows for side or top mounting as standard.
Additionally, all LevelWave instruments feature a
user-friendly external display, offering an intuitive
configuration for a new operator. An option for full digital
remote electronics, up to a distance of 100 m, is
The measurement solution can be used in a wide range of
applications, including blending, distillation tanks, process tanks
and separators, solid silos and storage tanks for most liquids,
pastes, foam and corrosive media.
Select 7 at