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Dresser-Rand has continued to maintain a focus
on technology throughout the course of its 100+ year history. The company has made
substantial investments over the last several years to support this position. Some of the
key areas the company has made investments in include:
Dynamic Simulation Analysis
Dresser-Rand has invested in technology to perform dynamic
simulations on power recovery trains, using proprietary software. These studies predict
the system response to a variety of upsets such as trips, valve failures, coupling
breakage, etc. Parametric studies of items such as valve sizes, stroke times, controller
gains. Configurations can be evaluated without physically building the system. Controller
stability can be demonstrated over extended time periods.
Blade Stress and Frequency Analysis
Dresser-Rand has sophisticated blade stress and frequency analysis capabilities. Steady
state stresses of the blade airfoil, attachment and disk may be calculated for any
operating point of interest. The same finite element model is then used to calculate
natural frequencies and mode shapes, including the influence of the disk on
resonances. An
interference diagram may be created to determine potential interferences. These
frequencies are then utilized to calculate the associated dynamic stress, which determines
the severity of each interference.
Post processing routines allow plotting of stresses of any or all of the blade/disk
combination. Traditional Campbell, Goodman and Blade Life curves may also be prepared to
evaluate mechanical designs.
Using parametric modeling, UG solid models can be
updated more quickly and accurately.
CFD Analysis
Dresser-Rand has in-house Computational Fluid Dynamics (CFD) capabilities. This allows the
design engineer to optimize a flow path design for a given set of customer requirements.
In addition, secondary flows and particle paths can be visualized, which can provide
insight into the causes of secondary erosion. The influence of cooling steam entering the
flow path can be demonstrated. Proposed design enhancements can be quickly evaluated
without need for prototype testing. The increased primary /secondary erosion potential
associated with a revamp can be predicted, and recommendations made to maximize blade
life.
You can contact your Dresser-Rand representative or the service organization for
assistance with your erosion problems.
 Unigraphics
The sophisticated Unigraphics CAD/ CAM software is the standard design platform for
Dresser-Rand designers. With its advanced solid modeling capability and capacity to
deliver art-to-part products, the UG system enables Dresser-Rand to offer competitive
solutions for its customers to exact customer requirements.
The Unigraphics CAD/CAM system further enhances the company's ability to design and
manufacture products of the highest quality. Unigraphics is being used in the design of
the company's DATUM centrifugal compressor product line, its VECTRA power turbine product
line, as well as its power recovery machinery. Unigraphics enables concurrent engineering,
an environment in which engineers work concurrently with one another across the spectrum
of design, analysis and manufacturing. Unigraphics, and its 3-D solid modeling
capabilities, allows engineering to handle more projects with substantially reduced cycle
times.
Rotor Dynamics
Dresser-Rand utilizes two rotor dynamic programs, lateral and torsional. The lateral
programs permit the calculation of rotor-bearing-support undamped natural frequencies,
fluid film bearing and seal characteristics, synchronous response to unbalance,
rotor-bearing-support damped natural frequencies, and labyrinth seal characteristics. The
torsional programs permit the calculation of train lateral steady state frequencies and
response to accels of synchronous and variable speed electric motors. They represent
current state-of-the-art application in rotor dynamics analysis.
Control Systems
Dresser-Rand supplies control systems for compressor, generator, and related
turbomachinery applications. The DI-Tronics IV control system is PLC (programmable logic
controller) based and features a Windows based color graphics Operator Interface. The
system can be configured to control, monitor and protect a variety of machinery types
including gas turbine, steam turbine, motor and expander driven trains as well as
associated turbomachinery applications.
The PLC based control system provides gas turbine fuel control, steam turbine governor
control, compressor surge control, machine vibration and temperature monitoring, train
sequencing and machinery protection, all integrated into the PLC. The user-friendly
Operator Interface system features graphic and text based screens, real time and
historical trending, report generation, as well as alarm, shutdown and event logging
capabilities. The PLC and Operator Interface systems can be field modified by the operator
if required.
Testing Capabilities
Testing is the final quality check on all manufactured equipment. The Dresser-Rand test
facility in Olean, NY, one of the most comprehensive in the world, offers a significant
advantage for customers. Within 58,000 sq. ft. (5,400 sq. m.), the area provides enhanced
capability to undertake full load compressor testing. ASME PTC 10 Class I hydrocarbon
tests can be conducted up to 108,000 horsepower (80+ MW). Dresser-Rand has 23 steam
turbines (up to 30,000 hp /22 MW) available to conduct various tests. The company also has
two dual rotation, variable speed electric motors operating to 2,500 hp (1,9 MW). The
facility has 20 test stands allowing maximum flexibility in meeting customer requirements.
As would be expected, modern data acquisition systems are incorporated to meet strict API
and customer specifications including state-of-the-art computing capability.
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