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RELIABILITY
WIRE by www.reliabilitydirect.com
"Your
One Stop Shop for Condition Monitoring"
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Vibration,
Balancing, Alignment, Ultrasound, Oil Analysis & more...
Volume
5, Issue # 3 - March, 2004
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In
this Issue:
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New
Products: The
latest additions to the largest e-catalog for Condition Monitoring
Ask The Expert:
Mounting Bearings using Heat
What's
Hot: Seriously
Cool tools for Less than $500.00!
Recommended Book: Machinery
Process Equipment Maintenance and Repair (Practical Machinery Management
for Process Plants, Vol. 4)
by
Heinz P. Bloch, Fred
K. Geitner
New Websites: Our
latest eStores and Reference centers www.hazardousareadirect.com ,
www.maintenanceproductsdirect.com
Contest
Winner: Tom
Davidson, P.E. - BOC Gases |
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New
Products: What's
new at the Largest e-commerce site for Condition Monitoring
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www.hazardousareadirect.com - Our new resource and product
site devoted to Intrinsically Safe products certified for use in
hazardous areas.
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www.maintenanceproducts.com - A new one stop source for SKF
Maintenance Products such as bearing installation and removal tools,
instruments, lubricators, grease, and lot's of good technical
information - site is under construction and will be completed in the
near future.
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The
EX-TP20 is a reliable, robust temperature measuring device for use in
Ex-hazardous areas. Meeting the needs and requirements that are
demanded for optimum use, the device is capable of precise measuring
up to +200C and is certified for use in any classified Ex-zone.
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The Intrinsically Safe digital multi-meter
EX-DM1000 comes with the Ex-classification Ex ll 2G EEx ia llCT4
according to ATEX (Technical Monitoring Association approval TÜV 01
ATEX 1658 X) FM-Indicator: I.S. Class I Div. 1 Group C, D, T4, I.S.
Class I Div. 2 Group AD T4 (Approval Report) satisfies a large number
of applications both within and outside Ex-areas.
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The
TMBH1 "SCORPIO" is a portable bearing
heater for heating bearings with an inner diameter of 20 to100 mm (0.8
to 4.0 in), and a maximum corresponding weight up to 5 kg (11 lb). It
can also be used for heating metal components gears, pulleys,
bushings, and shrink rings. The unit is supplied with a heating clamp,
temperature probe, power cable (without plug), heat resistant gloves
and a carrying case.
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Ask The Expert: |
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Mounting bearings using heat
The force
needed to mount a bearing increases rapidly with bearing size. Because
of the mounting force required, larger bearings cannot easily be pressed
onto a shaft or into a housing. Therefore the bearing or the housing is
heated before mounting.
Hot Mounting
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The temperature difference between
the bearing and seating depends on the magnitude of the interference
fit and the bearing size. Normally a bearing temperature of 80 to 90
°C (144 to 162 °F) above that of the shaft is sufficient for
mounting. Never heat a bearing to a temperature greater than 125 °C
(257 °F), because the material may change metallurgically and
produce alterations in diameter or hardness. Local overheating must
be avoided and in particular never heat a bearing using an open
flame. Wear clean protective gloves when mounting a hot bearing.
Lifting (hoisting) gear can facilitate mounting. Push the bearing
along the shaft as far as the abutment and hold the bearing in
position, pressing until a tight fit is obtained. |
Principle of Induction Heating
An induction heater can be compared to a transformer
using the principle of a primary coil with a large number of windings,
and a secondary coil with a few windings, on a mutual iron core. The
input/output voltage ratio is equal to the ratio of the windings,
while the energy remains the same. Consequently, the secondary coil
will provide a low voltage at a high amperage. In the case of the SKF
induction heater, the bearing is a short circuited, single turn,
secondary coil through which a low A.C. voltage flows at high
amperage, thus generating high heat. The heater itself, as well as the
yoke, remains at ambient temperature. As this type of heating induces
an electric current, the bearing will become magnetized. It is
important to ensure that the bearing is then demagnetized so that it
will not attract metal particles during operation. All SKF induction
heaters have automatic demagnetizing cycles.
Link to our
Bearing Heater Product Index:
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What's
Hot: Seriously Cool
Tools for Less than $500.00
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auto-ranging multi-meters
include Infra Red temperature measurements - an
important innovation as the demand for non-contact temperature
measurements is increasing for diagnosis and troubleshooting. No
matter which model, all of the multi-meters 400 series provide very
high resolution backlit display and are CAT III-600V rated - from
$99.00.
The
Model
381275 Handheld MultiScope is a Graphical
Storage Oscilloscope and True RMS Multi-Meter Includes RS-232
Interface and PC Software - only $329.00.
The
AccuTrak VPE represents state of the
art technology for pinpointing leaks in air conditioning and
refrigeration systems. Additional applications include the detection
of bearing wear, leaks in ductwork, leaking steam traps, as well as
valves, vacuum leaks and electrical arcing. Complete Kit just
$239.00.
The
Model EXT-42530 Infra Red Thermometer provides Wide Range
temperature measurements from -58 to 1,000 Deg. F - yours for
$99.00.
The
Model EXT-461825
is a combination meter that performs
Tachometer RPM Measurement and Stroboscopic Speed and Motion
with course and fine flash rate adjustments to analyze rotating
machinery - just $329.00.
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Recommended Book:
This month's 5 Star Recommendation
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Machinery Process Equipment Maintenance and Repair (Practical Machinery
Management for Process Plants, Vol. 4) by
Heinz P.
Bloch, Fred K. Geitner
This updated edition is an invaluable
source of practical cost-effective maintenance, repair, installation,
and field verification procedures for machinery engineers. It is
filled with step-by-step instructions and quick-reference checklists
that describe preventive and predictive maintenance for major process
units such as vertical, horizontal, reciprocating, and liquid ring
vacuum pumps, fans and blowers, compressors, turboexpanders, turbines,
and more.
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Contest
Winner: Vern Maddox, P.E. - Equistar
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February Question:
The
Model 256 instrument provides
two simultaneous
inputs
for two-pane balancing, it includes a built-in
laser device
for speed measurement and phase
reference.
Prize:
Raytek MT4 MiniTemp Infrared Thermometer AND the new
Reliability Direct Ball Cap! |
March Question:
The
SG-2 Sound generator may be used in continuous or burst mode at ______
up to ______ at 30 cm.
This highly recommended accessory provides tones for trouble
shooting pressure vessels and air tight applications.
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