Constraint Tightness and Looseness versus Local and Global ...
MCM Case Studies - Ascenixascenix.com/images/4.2_Case_studies.pdf•MCM first gave a warning of a...
Transcript of MCM Case Studies - Ascenixascenix.com/images/4.2_Case_studies.pdf•MCM first gave a warning of a...
![Page 1: MCM Case Studies - Ascenixascenix.com/images/4.2_Case_studies.pdf•MCM first gave a warning of a problem on 16th October 2005, and diagnosed a looseness problem. The decision was](https://reader033.fdocuments.in/reader033/viewer/2022041922/5e6c3a62ed8ad133ff1681e9/html5/thumbnails/1.jpg)
March 2011
Artesis MCM Case Studies
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Segment: Automotive
Company: Automobile Manufacturer A
Equipment: Pump
Fault: Stator Isolation Breakdown
Case 1
Decreasing current unbalance level
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MCM gave alarm indicating a developing electrical fault. Thermal camera results verified MCM’s warnings. The pump motor was replaced.
Segment: Automotive
Company: Automobile Manufacturer A
Equipment: Pump
Fault: Stator Isolation Breakdown
Case 1
Hot Spot on stator winding
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• MCM first gave a warning of a problem on 16th October 2005, and diagnosed a looseness problem. The decision was to wait for further indications.
• Renewed alert on 19th November 2005 initiated an inspection and a loose attachment bolt was found on 14th February 2006.
Segment: Automotive
Company: Automobile Manufacturer A
Equipment: Tower Fan
Fault: Imbalance & Misalignment
Case 2
Increasing unbalance parameter level
Oct 16 2005
Oct 24 2005
Nov 19 2005
Feb 14 2006
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Segment: Automotive
Company: Automobile Manufacturer A
Equipment: Tower Fan
Fault: Imbalance & Misalignment
Case 2
Oct 05 Nov 05 Dec 05 Jan 06 Feb 06 Mar 06
Looseness
indicated briefly,
but then
problem
disappeared
Consistent
alarm on
foundations,
imbalance and
misalignment
Continued
monitoring of
foundation
problem
Continued
monitoring of
imbalance and
misalignment
problem
Fixed
foundation
problem
Loose bolt correctly identified
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Segment: Automotive
Company: Rubber & Tire Manufacturer
• MCM identified existing transmission and unbalance faults
• Later, MCM began giving “Rotor Fault” warning also
Equipment: Rubber Mixing Mill
Fault: Rotor Bar Crack
Case 3
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• The “Rotor Fault” trend showed development of the rotor fault
• Vibration measurement also verified existence of broken rotor bars, confirming the MCM predictions
Increasing Trend
Segment: Automotive
Company: Rubber & Tire Manufacturer
Equipment: Rubber Mixing Mill
Fault: Rotor Bar Crack
Case 3
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This case shows that MCM can be a very useful tool for quality assurance of maintenance work, showing whether alignment has been correctly completed following a maintenance task.
Segment: Oil & Gas
Company: Oil & Gas Company A
Equipment: Diesel Fuel Pump
Fault: Misalignment
Case 4
Diesel Fuel Pump
Trials of Axle adjustments
3th July; Change of Oil Felt
4th July; axle adjustment done
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Segment: Aerospace
Company: NATO Radar Base
Equipment: Radar Antenna
Fault: Gear Box Defect
Case 5
January 24 2003, the problem starts
February 4 2003, the gear box changed
A gear box defect is detected at a NATO radar base. Early detection of this fault helped uninterrupted operation of the radar.
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Segment: Water
Company: Water Distribution Co. A
Equipment: Pump
Fault: Loose Foundation & Unbalance
Case 6
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Segment: Water
Company: Water Distribution Co. A
Equipment: Pump
Fault: Loose Foundation & Unbalance
Case 6
April 29, 2008 February 19, 2009
Before Maintenance
Unbalance Problem
April 29, 2008 February 19, 2009
After Maintenance
Loose Foundation Problem
Before Maintenance After Maintenance
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Segment: Metals
Company: Iron & Steel Company A
Equipment: Reversing Cold Rolling Mill Fume Fan
Fault: Dirty Filter
Case 7
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Segment: Metals
Company: Iron & Steel Company A
Equipment: Reversing Cold Rolling Mill Fume Fan
Fault: Dirty Filter
Case 7
• This fan discharges dust-laden air out of the factory via a filter.
• MCM started to warn the user by giving a “Watch Load” alarm on 15th April 2009.
• Examination of the motor current trend shows that the motor current had been gradually decreasing since 17th November 2008. This indicates that the filter blockage started on that date and had been gradually deteriorating to the point where it exceeded the MCM alarm level on 15th April.
• This drop off in current shows that the fan had not been extracting the desired volume of air, and hence the ventilation in the plant would be below design levels.
Motor Current
Motor Status 2 Parameter
Watch Load Level
11.17.2008 04.15.2009
05.25.2009
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Segment: Metals
Company: Iron & Steel Company A
Equipment: Reversing Cold Rolling Mill Fume Fan
Fault: Dirty Filter
Case 7
• The maintenance team attempted to clean the filter with compressed air on 25th April 2009, but it was not fully successful. MCM started giving a “Watch Load” alert again after just 1 month of operation.
• The team changed the filter completely on 20th August 2009. After this MCM stopped giving alert signals and the motor current reverted to its nominal value.
• This sort of fault would not have
been possible to detect by
Vibration analysis.
Motor Current Maintenance 08.20.2009
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Segment: Food
Company: Sugar Refinery
Equipment: Deep Well Pump
Fault: Cavitation
Case 8
• Just after MCM’s LEARN period was completed, the MCM warned about a fault in a frequency band associated with Cavitation.
• The maintenance team dismantled the pump and checked for cavitation. The photos show the damage of cavitation which can be observed as small pits on pump blade, hence confirming the diagnosis.
Increasing failure level
• After maintenance, MCM stopped warning.
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Segment: Automotive
Company: Automobile Manufacturer B
Equipment: Exhaust Fan
Fault: Belt Looseness
Case 9
• MCM indicated a transmission fault, so the engineers looked at the trending data, which pointed to a loose belt.
• The maintenance team confirmed belt looseness.
• Belt looseness would tend to result in slippage, which in turn would mean that the motor could not transmit all the power to the fan. This was consistent with the decrease in the three phase currents.
Increasing failure level
Decreasing current level
Belt tension starts to loose
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Segment: Power Generation
Company: Power Generation Company A
Equipment: Feed Water Pump
Fault: Bearing Fault
Case 10
One month after the MCM installation, MCM indicated a developing “Bearing” fault. Maintenance team verified the bearing fault and replaced the bearing of the motor. After the maintenance action MCM stopped giving alarm verifying the effectiveness of the maintenance action.
03.26.2009 03.30.2009
Developing bearing failure
03.26.2009 03.30.2009
MCM Alarm history Examine 1 Level
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Segment: Water
Company: Saline Water Conversion
Equipment: Pump
Fault: Stator Failure
Case 11
• The frequency spectrum indicates stator winding problem in both pumps at 120 Hz as shown in the figure below.
• Both pumps are stopped and then restarted in the same day on May 14, 2007. MCMScada long term trending data shows an increase in current balance parameters and amplitude variations in currents before and after May 14, 2007.
Current Balance
May 14, 2007
S and T phase currents before May 14, 2007
Swapped S and T phase currents
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Segment: Manufacturing
Company: Battery Manufacturer
Equipment: Compressor
Fault: Bearing Fault
Case 13
• MCM started giving intermittent warnings on September 2005, and a bearing problem was diagnosed by MCM. Deterioration was kept under review until January 2006. When carried out, maintenance and repair actions verified the diagnostic assessment of MCM.
• On later examination of the MCM trends, it was found that the bearing problem was detected even earlier that 13th September2005, but the severity was not sufficient to give rise to an alert. This demonstrates the capability of MCM to indicate developing faults at a very early stage.
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Segment: Manufacturing
Company: Battery Manufacturer
Equipment: Compressor
Fault: Bearing Fault
Case 13
Aug 05 Sept 05 Oct 05 Nov 05 Dec 05 Jan 06
No problem,
other than minor
supply issue Bearing problem
indicated, with 3
month warning
Progress of
bearing problem
monitored –
early indication
in August
Problem fixed,
having had 3
months to
prepare
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Segment: Metals
Company: Iron & Steel Company B
Equipment: Pump
Fault: Coupling
Case 14
Coupling fault detected and remedied.
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Segment: Manufacturing
Company: Home Appliance Man.
Equipment: Phosphate Pump
Fault: Bearing Defect & Bent Shaft
Case 15
Change of bearings and shaft
Change of bearings
Increase in the 10th and 12th
mechanical parameters.
Bearing fault
detected. The same
fault indication
repeated again later.
Further analysis
indicated to an bent
shaft which was
causing the fault.
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Segment: Automotive
Company: Automobile Manufacturer C
Equipment: Pump
Fault: Unbalance
Case 16
• MCM started giving ‘Unbalance’ warning and soon after it became nearly consistent, on 28 th May 2010.
• Maintenance team checked the motor and verified the imbalance.
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Segment: Automotive
Company: Automobile Manufacturer C
Equipment: Pump
Fault: Unbalance
Case 16
• ‘Unbalance’ and ‘Motor Status 2’ parameters show the development of the fault.
Increasing failure trend
05.28.2010
Motor Status
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Segment: Pharmaceutical
Company: Pharmaceutical Manufacturer
Equipment: Ventilation Fan
Fault: Turbulence
Case 17
• Discontinuous but frequent warnings regarding ‘Driven Equipment Fault’ were detected on a Ventilation Fan, that had been monitored by MCM.
• After a detailed investigation, it was realized that the warning was being given while the monitored fan was running together with the other fan supplying air to the same ventilation duct.
• It was observed that when two motors run together they will cause turbulence in air flow.
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Baseline from June 2010 showing clear, valve related sideband energy
Baseline from October 2010 following an overhaul. It can be seen that the valve sidebands are no longer present but there is broadband noise from one of the piston baffles.
Case 18
Segment: Oil & Gas
Company: Oil & Gas Company B
Equipment: Reciprocating Compressor
Fault: Valve Leaking
LNG compressors were being monitored by VA, which was not detecting problems. MCM was then fitted to the compressors. We analyzed the results and advised that there were leaking valves that should be attended to at the next overhaul. When the equipment was stripped down, the diagnosis was confirmed. Following the overhaul, the MCM was put back into learn mode to give a new PSD curve, which had a significantly different shape from the earlier one, confirming that we detected the change resulting from the overhaul. Vibration Analysis detected no change whatsoever.
October 2010
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• MCM correctly identified that the pump had no major faults
No major faults – all green
Case 19
Segment: Oil & Gas
Company: Oil & Gas Company C
Equipment: LNG Pump
Fault: Shaft Deflection
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• MCM trends revealed that the pump was experiencing increased rub energy when the load was too high
• The cause of this was slight movement in one of the shaft bearings causing wear to the shaft and shaft deflection.
• This was confirmed during strip down work on the pump and was related to a design problem that has since been eliminated.
Case 19
Segment: Oil & Gas
Company: Oil & Gas Company C
Equipment: LNG Pump
Fault: Shaft Deflection
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• MCM began giving load alarms in September 2010.
• Some inherent friction-related faults were identified in the frequency spectrum.
Segment: Water
Company: Water Distribution Co. B
Equipment: Pump
Fault: Pump Blockage
Case 20
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• MCM began giving load alarms in September 2010 and the active power of the pump dropped drastically in December.
• The cause was a piece of wood blocking the pump inlet.
Case 20
Segment: Water
Company: Water Distribution Co. B
Equipment: Pump
Fault: Pump Blockage
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• Power from waste generation station.
• Between shutdowns the ID Fan system fouls leading to reduced efficiency.
• MCM identifies this point by recognising the difference in the load conditions of the motor.
Load alarm as power drops off / increases!
Segment: Power Generation
Company: Power Generation Company B
Equipment: ID Fan
Fault: Fouling
Case 21
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• The trends highlight the gradual change in current between shutdowns, indicating that the system is fouling and that the fan is working harder to overcome this.
• Temporary, short term, changes in power can also be seen to have a large effect on the vibration response of the machine.
Case 21
Segment: Power Generation
Company: Power Generation Company B
Equipment: ID Fan
Fault: Fouling
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• Frequent alarm and trend responses indicated changes in internal motor conditions.
Green, yellow and blue lines correspond to internal electrical fault
Segment: Oil & Gas
Company:Oil & Gas Company D
Equipment: Pump
Fault: Stator Insulation Progression
Case 22
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• The trending showed that there was significant phase current disproportionality in addition to the stator-related trend increases and alarms.
Red line (Ir) and yellow line (Is)
cross over frequently, indicating
inconsistent behaviour between
the phases
Currents in the three phases vary in
shape and separation
Case 22
Segment: Oil & Gas
Company: Oil & Gas Company D
Equipment: Pump
Fault: Stator Insulation Progression