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Vibration
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Order Number
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Title
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Author
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Date
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Vibrations of Cooling Tower Fans (TP-7A)
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Michael P. Blake, Monsanto Chemical Company
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1963
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Abstract:
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Cooling Tower Fan Vibration Monitoring (TP-86-11)
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D.L. Pete Bernhard, IRD Mechanalysis, Inc.
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1986
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Abstract:
The paper presents a few basics of vibration and lists the
primary causes of cooling tower vibration based on actual case
histories. Continuous monitoring requirements are outlined.
Recent equipment developments aimed specifically at cooling
towers will be described. Recommended guidelines for effective
control of cooling tower vibration is also presented.
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Types of Cooling Tower Fan Vibration Monitoring (TP-87-09)
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Robert Alan Hund & Ivo Dabelic, Vibranalysis Engineering Corp.
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1987
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Abstract:
Presents cooling tower fan vibration monitoring techniques: A)
Trending through existing in plant p.m. program; B) Hardwired
multi-point per panel application; C) One device (switch) per
point application. Advantages and disadvantages will be
discussed and case histories cited.
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Vibration Control: New Fan Blade Tip Reduces Pulsation
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Henk van der Spek, Howden Cooling Fans
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2003
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Abstract:
This paper describes the test method and test results of a
research project into the effect of tip speed and blade angle of
the cooling tower fan on the pulsation forces exercised on the
fan stack. Pulsation on the fan ring is directly caused by the
movement of the cooling tower fan, and occurs at blade passing
frequency. The pulsation force is a combination of the
aerodynamically generated pressure difference between the
upstream and downstream side of the fan blade and the velocity
(under) pressure generated by the surface of the blade tip. The
extent of this effect has been confirmed by extensive
measurements.
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Cost Effective Cooling Tower Fan Vibration Monitoring
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Talmadge D. Ward Jr., and Mickey Talley
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2003
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Abstract:
Installation of a low cost vibration system is being deployed at
Paducah Gaseous Diffusion Plant using accelerometers on cooling
tower fan gearboxes. While this system does not have an
automatic data gathering or vibration trip capability, the
manual data is used to improve the reliability of the fans while
reducing vibration levels and maintenance cost. Accelerometers
are installed on the gearboxes perpendicular to the drive shaft
and the cable run the length of the support structure ending
outside the fan shroud at the drive motor. During route
vibration data collection, additional gearbox vibration overall
values and spectra are stored with the conventional motor data.
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Roulette and Mechanical Vibration Switches: What are Your Odds?
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Gene Ort
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2006
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Abstract:
You have a better chance winning at roulette than protecting your
cooling towers with mechanical vibration switches. What are the odds
at roulette? You put your money on the table enough times and the
casino takes 5.76% of it. The switches are not even close.
Cooling towers are no longer "balance of plant" (BoP)
equipment, and have increasing significance in facility operations.
With any reasonable definition of "protection", mechanical
vibration switches, called earthquake switches by those who know, may
offer no protection from the most likely causes of cooling tower
problems. Better alternatives (non-commercial) are presented for
consideration.
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Smart Vibration Switches
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Dr. George Zusman - PCB Piezotronics
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2007
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Abstract:
This intelligent, two-wire vibration switch is a new type of device
for machinery protection. It has been designed to be a cost effective
tool for generating an alarm or initiating shutdown of small to
medium-size machinery, such as electrical motors, pumps, cooling
towers, fans, and compressors.
The device is entirely self-contained within hermetically sealed,
stainless steel housing. The unit's appearance is very similar to
industrial accelerometer and has the same simplicity of installation.
In the same time it is based on vibration velocity RMS vibration
switch providing virtual iniversal compatibility with any type of
load, relay, monitoring system, or control device.
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Wireless Vibration Monitoring for Condition Based Maintenance Cooling Towers
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Gerry Nadley, MachineTalker, Inc
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2008
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Abstract:
An overview of peer to peer wireless ad hoc networks explaining basic characteristics, and modes of operating. This will include reliability and ease of operating and installation. The wireless network application will show the operating of the wireless network for vibration monitoring of cooling tower motors and gearboxes using an oil refinery installation as an example. The discussion will include sensor selection (IMI sensors), radio placement and connection to a remote control room. The post analysis software will be described including FFTs (Fast Fourier Tranform), trending and the computer analysis to determine vibration anomalies.
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