www.stiweb.com vibration monitoring & machine protection systems cooling tower vibration...
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www.stiweb.com Vibration Monitoring & Machine Protection Systems
Cooling Tower Vibration Monitoring
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Closed Loop Cooling Tower System
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Types of Mechanical Draft Towers
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Typical Power Plant
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Cooling Towers At Nuclear Plants
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Cooling Tower Critical Components
•Fans
•Gear Boxes
•Motors
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Cooling Tower Failures - Blades
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Cooling Tower Failures - Gearboxes
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Cooling Tower Application Issues
– Towers are very flexible– High vibration values during startup.– Complex gearbox (1800/120 RPM)– Neighboring cells effect measurement
– Starting cell 2 can shut down cell 1– Reversing fans in cold climates– Water build up in blades– Speeds are slow and based on diameter– Distance to control room– Corrosion from bad pH
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Existing “Earthquake” Sensors
– Calibrated by dropping sledgehammer– Do not always trip– Some use Ball and Pedestal– Operators do not like climbing the tower– Alarm value usually set to high to help– No provision for Startup (Tx)– No OK Circuit
www.stiweb.com Vibration Monitoring & Machine Protection Systems
CMCP-500 Series Monitoring
– Transmitter or Monitor– 24 VDC Powered– Trip Multiply Standard– OK Circuit– ADC Option– RF Link option– Fiberglass or SS NEMA 4X Enclosures
www.stiweb.com Vibration Monitoring & Machine Protection Systems
12 Cell Cooling Tower Monitoring System
– Typical Rotating Machinery and Sensors• Circulating Water Pumps (2)
– 6 Accelerometers– 4 Eddy Probe Systems– 2 Phase
• Cooling Tower Pumps (2)– 6 Accelerometers
• Gearbox and Fan (12)– 12 Accelerometers or Velocity
• Motor and Jackshaft (12)– 12 Accelerometers (Output Shaft)
www.stiweb.com Vibration Monitoring & Machine Protection Systems
10 Cell Cooling Tower Monitoring System
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Dual Path Monitoring
Displacement (mils)
•Running speed (1X)
•Blade passing
•Blade multiples
Velocity (in/sec)
•Gear mesh
•Bearings
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Dual Path Monitoring System
– CMSS793V Transducer– CMCP-602L-32-01-01 Cable– CMCP-5302 Monitoring System w/
• CMCP-530-100V-02R-XXX-XXX– 0 to 1.0 in/sec (0 to 25 mm/sec)
• CMCP-535-100V-03-XXX-XXX– 0 to 15 mils (0 to 375 microns)
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Circulating Water Pumps
www.stiweb.com Vibration Monitoring & Machine Protection Systems
Where are the Cooling Towers ?
• Power Generation– Steam– Nuclear– Geothermal
• Hydrocarbon Processing (HPI)– Refineries– Chemical Plants
• Food Processing– Tropicana– Campbell Soup
• Large Buildings (HVAC)
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