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SimsiteŽ
Composites Bearings
SimsiteŽ Guide Bearings Lead the Way...
Ask any engineer
to describe the ideal material for bearings used in problem
environments. What would he say? Most likely, he would tell
you that the ideal material would have these characteristics:
- be self-lubricating to
prevent seizing or galling.
- a composite that
resists corrosion, erosion, and doesn't support
electrolysis.
- have a highly polished
surface finish to reduce wear on the shaft and on
the bearing itself.
- it should be able to
withstand high continuous running temperatures and
extremely high flash temperatures.
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- have excellent
mechanical strength to withstand loading and torque.
- it should have
rigidity to reduce redial movement, vibration, and
noise.
- accommodate precision
machining for tight clearances and correct
alignment.
- lend itself easily to
custom modification.
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Then hand and engineer a piece
of Simsite or, better still, show him a Simsite Bearing that has been
functioning flawlessly for more than seven years in saltwater service.
You can achieve the ideal!
Simsite's Unique Qualities Work
for You:
Machines are not always perfect. And when a lubricating system
fails, damage to a rotating element can be extensive. That means lost time
and money. But having Simsite Bearing working for you can save your
equipment from significant damage. Simsite Bearings' have self-lubricating
characteristics which prevent the bearings from galling or seizing on the
shaft even when lubrication fails. This has saved the life of many rotating
elements. Simsite Bearings are significantly superior
to other guide bearings because they offer rigidity to the rotating element as well as an
unusually low coefficient of friction. The superior lubricating qualities of graphite are
imbedded throughout the Simsite Composite.
Simsite Bearings can take the heat...
Simsite Bearings can withstand extremely high
flash temperatures up to 1000 degrees F., and continuous running temperatures from
300 degrees F. with standard Simsite and up to 400 degrees F. with a
high-temperature grade of Simsite. Unlike plastic, elastomer, or rubber bearings, Simsite
Bearings will not melt, get spongy or soft, or seize when exposed to high temperatures.
Most bearing materials will not tolerate flash temperatures and will literally melt on the
shaft in the event of any dry running.
Simsite Bearings have a remarkably
low
coefficient of friction...
Simsite Bearings have an extremely low
coefficient of friction, because they have graphite embedded throughout the composite
which acts as a lubricant. When lubricated by water, oil or grease, Simsite is ideal as a
guide bearing, rudder, stern tube, stabilizing or oil-seal bearing. The
chart at right compares the low friction characteristics
of Simsite with other leading bearing material:
The Strength of Simsite
Protects your Equipment
 The unusually high mechanical strength
of
Simsite offers many advantages over conventional bearings. They are precision machined
from a solid block of Simsite rather than poured or molded. Because its fibers are never
chopped, cut or ground, the Simsite Bearings has greater shear, bound, flexural and tensile
strength than other materials. Simsite's outstanding mechanical properties enable the
bearing to withstand higher loads and torque requirement. Unlike bearings of carbon or
pressed graphite, the Simsite Bearing will not crack or break under load. Compare
Simsite's superior tensile strength with other bearing materials shown in the chart
at left:
Electrolysis is Substantially
Reduced with Simsite
Because Simsite is basically an inert composite,
electrolysis is greatly reduced. Simsite Bearings seal against the casing or the housing
preventing leakage and eliminating the damage of corrosion and erosion. This is critical
because it insures that the bearings will be secured properly reducing the risk of damage
to the entire rotating element.
 Longer Life for the Complete Rotating
Element
Because Simsite Bearings hold the shaft more
securely than conventional bearings, radial movement in the shaft is reduced. This
increase the life span of the entire rotating element. When you combine a Simsite Impeller
and casing rings with a Simsite Guide Bearing the length-to-diameter (L/D) of the rotating
element is reduced. The stability of the rotating element is therefore
improved because of the lower mass. This lower mass (approximately 1/5 the weight of
bronze) accounts for its excellent PV characteristics as is illustrated by the chart
at left:
Cutting
Nightmares down to size
Our chart and figures present a
convincing case for Simsite Bearings, but reality presents an
even better one. When a leading power utility lost cooling to
the bearings on two cooling pumps because of a clogged line,
the stage was set for an engineer's nightmare.
One of the pump had bronze guide bearings and a bronze
impeller which failed totally. The bearings housings were
severely damaged as well as the impeller and pump casing.
Downtime For Repair With
Bronze: Several Month.
The other pump was identical in all respects but two: the
SimsiteŽ components and the result. The pump continued to do
its job of cooling the plant equipment without the benefit of
cooling to its own Simsite Guide Bearing.
Did the SimsiteŽ Bearings emerge unscathed? No, the
clearances were opened up a bit - but the impeller, the
housings and the pump casing were in perfect condition.
Downtime For Repair With
SimsiteŽ: One Day ( On-Site).
Analysis: the qualities of SimsiteŽ Bearing can make the
difference between disaster and business as usual.
A Tradition
Of Innovation Continues
Sims has been delivering new ideas in pump and bearing
technology for more than 80 years. From the invention of the
original Sims Pump Valve in 1919 through the development of
totally non0metallic SimsiteŽ Pump today, Sims has been an
innovator in marine and industrial pump applications. The
Sims' guarantee of customer satisfaction stands firmly behind
each of its products and services.
Other outstanding SimsiteŽ products include impellers, casing
rings, complete pumps, and various structural and decorative
applications. We are ready to help you save time, money and
valuable equipment with SimsiteŽ Product. Contact our engineering
department for full details...because you can achieve the
ideal!
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