45. Pres_Tom Murphy

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.

Documents

45. Pres_Tom Murphy