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7/29/2019 45. Pres_Tom Murphy
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USING ULTRASOUND FOR CLASS TYPE APPROVEDUSING ULTRASOUND FOR CLASS TYPE APPROVED
TIGHTNESS TESTING OF HATCH COVERS ANDTIGHTNESS TESTING OF HATCH COVERS AND
PREDICTIVE MAINTENANCE OF SHIPBORNEPREDICTIVE MAINTENANCE OF SHIPBORNEMACHINERY.MACHINERY.
Presentation atPresentation at
ACI 4th Optimising Ship Management Conference
Rotterdam (The Netherlands)Rotterdam (The Netherlands)
2626--27/01/201127/01/2011
ByByWalter Vervloesem & Tom MurphyWalter Vervloesem & Tom Murphy
SDT Inetrnational (Belgium)SDT Inetrnational (Belgium)
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What is ultrasound?What is ultrasound?
Sound at any frequency above 20kHz
Typical operating range is 36-40kHz Use heterodyning to produce an audible signal from the
ultrasound which I can not only listen to but analyse
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How do I apply PdM?How do I apply PdM?
Few people do more than pay lip service to their PdM
programmes
What percentage of your maintenance is driven by
predictive data?
When PdM conflicts with CMMS, who wins?
Planned maintenance in this application is expensive,
but PdM is cheap. Who wins?
Predictive data, health data should be initiating andclosing your maintenance activities the measurement
cycle.
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The measurement cycleThe measurement cycle
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What can IWhat can I findfind with ultrasound?with ultrasound?
Friction
Turbulence Impacts
IF you have performed an FMEA and that shows up
friction, turbulence or impacting as a potential defectcharacteristics, ultrasound should be the most important
tool in your toolbox.
Works in contact mode and airborne mode
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ApplicationsApplications
Steam systems leaks and traps
Compressed air leaks Electrical systems defects that dont generate heat
Hydraulic systems valve inspection, cylinder inspection
On-condition lubrication Rotating and linear motion especially good for slow-
speed bearings
Many applications but always using the same tool
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Provide an ultrasonic solution for problems which can
not be identified with existing techniques
Enhance
failure finding
defining rectifying action of existing problems with
ultrasound.
Policy of SDT InternationalPolicy of SDT International
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Using the best stethoscope does not make you the best doctor
Correct diagnose of a problem requires:
Right tool
Training (advantages, testing techniques limitations and drawbacks
should be fully understood, evaluation of results) Knowledge about the item to be tested (see IACS UR Z17 for
service suppliers)
Ultrasonic tightness testing toolsUltrasonic tightness testing tools
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Tightness testing of vehicles (1980-1990)
Trials on board ships & learning by trial and error (1990 2001)
Class Type Approved equipment (2001)
Requirements for service suppliers (IACS UR Z17)
Preferred tightness testing technique by cargo interests and P&I
clubs
History of ultrasonic tightness testingHistory of ultrasonic tightness testing
on board shipson board ships
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OHV = reference value
Importance of leaks evaluated against OHV
Readouts > 10% OHV indicate that too much compression is lostand will not allow the packing rubber to compensate for movements
of the ship when in a seaway.
Basic principles of ultrasonic testingBasic principles of ultrasonic testing
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Hose tests give an indication of physical contact between rubber
and compression bar/mating surface
Ultrasonic tests give indication about the compression status of thesealing system
Loss of contact loss of compression
DEMO video/live demo
Difference between ultrasonic testing andDifference between ultrasonic testing and
hose testinghose testing
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US testing = indication of compression
Reduced compression = indication of problem
Lack of compression root cause
Root cause = more structurally related (resting pads,
compression/coaming defects)
If not picked up in an early stage, situation will aggravate quickly andbecome unacceptable, leading to serious problems with hinged
systems, panel positioning, excessive loads on wheels,
overcompression of rubbers, jacks,..)
US tightness testing of hatch covers andUS tightness testing of hatch covers and
predictive maintenancepredictive maintenance
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Thanks to the repeatability feature of class type approved equipment,
you are able to monitor and evaluate deterioration of the compression
which allows you to:
Focus on root cause
Plan repairs well in time
Carry out repairs in an early stage (and check efficiency of repairsmade)
Use resources where (and when) they are most needed
Increases flexibility
Reduce costs
Perform to a higher standard
Avoid unpleasant surprises when a vessel fails a test just prior to
loading. Improve safety of the ship (DRI, loadline,)
US tightness testing of hatch covers andUS tightness testing of hatch covers and
predictive maintenancepredictive maintenance
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US testing gives you an indication of the tightness and compression
status of the sealing system and does not reflect the overall fitness
of the hatch cover system. Tightness testing does not replace a visual inspection
Regular monitoring of the hatch cover tightness will reveal defects in
an early stage and reflects good practice and due diligence which is
important from a commercial point of view (charterers/shippers,
P&I,).
RememberRemember
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For questions and assistance with training, planning and setting up
systems, pls contact SDT international.
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Biography Walter VervloesemBiography Walter Vervloesem
W. Vervloesem (FNI )Chairman of IMCS Group of Companies L td (UK) 17 off ices.Manager of the IMCS Training Academy. Ex Chief Off icer (reefer,
gen. cargo, container & LPG) and shore based since 1989. Workingas marine consultant and surveyor for several Antwerp based andinternational companies. Fel low of the Nautical I nsti tute and founderof the Nautical I nstitute Belgian Branch.
Author of " Ship Survey and Audit Companion" (published byNautical I nsti tute 04/2000)) Author of Hatch Cover I nspections(published by the Nautical I nstitute - 08/2003) - Author ofMooring and Anchor ing Ships(published by the Nautical I nsti tute- 10/2009) - Co-author of " The Nautical I nstitute on Command"
(published by the Nautical I nsti tute" )
I nstructor for the SDT-I MCS hatch cover training course since 2001and working under a consul tancy contract wi th SDT on developmentof ul trasound applications in the marine industry for SDT since 2003
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Biography Tom MurphyBiography Tom Murphy
Thomas J. Murphy C.Eng.Managing Dir ector of Reliabil ity Team Limi ted.30 years post-graduate experience in the measurement and
application of vibration, inf rared and ul trasound.Consultant in predictive maintenance, FMEA and Root CauseAnalysis.
Co-Author of Hear More - a guide to using ul trasound for leakdetection and condition moni toring
Trainer of ultrasound courses to ASNT Level 1, Level 2 andimplementation courses to maximise the benef it of ul trasound.
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