The needs of the power generation industry
include year-in and year-out reliability, optimum performance
for maximum efficiency, and absolute on-time delivery
to meet plant outage schedules.
Yuba has been meeting the needs to the power generation industry for
more than six decades.
Yuba's quality makes
the company the most respected supplier of heat transfer
equipment in the world and the dominant supplier of
feedwater heaters. More than 5,000 feedwater heaters
bearing the Yuba name have been installed in electric
power plants worldwide. Yuba also produces exhaust steam
and dump condensers, moisture separator reheaters, header-type
high pressure feedwater heaters, shell-and-tube heat
exchangers, deaerators, flue gas reheaters and combustion
air preheaters.
Yuba is one of the few companies
capable of supplying the total range of heat transfer
equipment needs to the power generation industry.
• Feedwater heaters for every application
Yuba is the dominant supplier of feedwater heaters
to the power generation industry. Special design features
of Yuba feedwater heaters include venting systems with
positive control of vent flows, pass partitions with
multiple designs for access, large corner radii on high
pressure tubesheet-to-channel junctions, thick drain
cooler end plates, single and double desuperheating
section zones for moderate and extreme steam temperatures,
and U-tube bend supports of larger radius bends.
The reason is simple: Yuba understands power generation
and its special problems. Yuba's engineering and
manufacturing personnel are dedicated to supplying feedwater
heaters that exceed the requirements of its customers.
Yuba feedwater heaters are precisely optimized for each
installation. Yuba employs sophisticated computer design
and engineering programs to evaluate pressure drop,
study velocities throughout the feedwater heater, analyze
to eliminate tube vibration and examine performance
at overload conditions. In-depth experience and technical
expertise provide an extra measure of assurance that
Yuba feedwater heaters will meet varying load conditions,
thermal cycles and requirements imposed by forced
outages.
• Yuba's patented Hemilok®
head closure
High pressure feedwater heaters are
subject to thermal shock in cyclical service. Any high
pressure feedwater heater in cyclical use is subject
to thermal and pressure loads of a magnitude not encountered
during base loaded continuous service. Therefore, high
pressure feedwater heaters mandate special designs to
prevent the high stresses prevalent in cylindrical channels
in cyclical service. The design of the juncture between
the tubesheet and a cylindrical barrel is especially
critical since the tubesheet changes temperature at
a much greater rate than the cylindrical barrel.
Recognizing the need for a full access head capable
of withstanding the demands of high cyclical use, Yuba
engineers created the Hemilok® head, an innovation
so unique it was granted a United States patent in 1989.
This is one of the few patents granted in feedwater
heater technology in recent years.
The Yuba
design employs an internal spherical shape which is
stronger than a cylinder and has lower mass to minimize
the temperature difference that causes high stresses
between the tubesheet and the cylindrical barrel. The
Yuba design provides a large radius at this junction
to prevent stress magnification without a corresponding
increase in the outside diameter and the mass of the
barrel. Hemilok® technology will prevent the large
stresses inherent in the previous designs for base loaded
units and will provide the fatigue life required for
cycling and load-following units.
The Hemilok®
design provides full access for maintenance and employs
shear keys to take the large hydraulic end load. The
shear keys, which are also specially shaped to prevent
fatigue cracks, minimize bolting in the gasketed design
and reduce component weights for ease in opening and
closing.
The Hemilok® design assures fatigue
free operation in difficult service. It provides additional
space for ease of full access maintenance which is especially
applicable in channel sizes below 48" inside diameter.
Hemilok® designs are available in all sizes and
all high pressure applications, including supercritical
applications with design pressures over 5000 psi.
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Bethlehem, PA office of Yuba Heat Transfer is a global supplier of Heat Transfer Equipment and related technology for the power generation industry. Our products include steam surface condensers, direct contact condensers, turbine isolation dampers, steam jet air ejectors, heat exchangers, feedwater heaters, and vacuum deaerators. Condensers in operation have surfaces up to 1,400,000 sq. ft. and serve plants up to 1300MW.
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