STRUCTURAL HEALTHMONITORING

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LIFETIME EXTENSION ANDCOST-EFFECTIVE INSPECTIONPLANNINGSTRUCTURAL HEALTH MONITORING

Ramboll possesses decades ofexperience in developing andoperating custom-made structuralhealth monitoring systems (SHMSs)for new and existing complexstructures. Our services cover theentire SHMS project life cycle fromconcept and detailed design, overprocurement and installation tooperation and inspection planning.SHMS services are a way tooptimise and secure your long-terminvestments.

Structural health monitoring

The purpose of a SHMS is toprovide real time information aboutall relevant structural changeswhich occur in the structure. ASHMS consists of a set of sensorsand a communication unit, whichtransfers collected data to a remotePC and a smart-unit whichprocesses measured data in real-time and transmits alerts if changesoccur.

Ramboll expertise

Ramboll is an internationalengineering consultancy, and weare a full service provider to the oiland gas industry. Our SHMSexperience covers offshoreplatforms, wind turbines, buildingsand bridges, and includes:

• Planning and detailed design ofcustom-made SHMSs

• ‘One stop shop’ from SHMS designto inspection planning

• Certification and authorityapproval

• Technical specification of SHMSs• Root cause analysis• Advanced data processing• Linear and nonlinear system

identification• Operational modal analysis• Modal expansion• FE modelling analysis• FEM updating and Lifetime

prediction• Wave load calibration• Fatigue reassessment• Damage detection (warning

systems)• Automated SHMS reporting• Cloud computing• Reliability and Risk based

inspection planning• Offshore platforms, wind turbines,

buildings and bridges

Technical specification anddetailed design of SHMS [1]:

In close cooperation with clients,our engineers determine thepurpose of the SHMS, requirements,installation limitations and expectedoutcomes. Finally, we deliverdetailed technical specifications,

an optimal sensor layout, sensorsspecifications and theirrecommended locations.

Troubleshooting [2]:

In a case where insufficientlyunderstood responses are detectedon the structures, it is important toidentify the sources which causedthem. Ramboll experts performtime limited or automatedmeasurement campaigns todetermine the root causes.

Procurement and installation [3]:

Ramboll is in contact with the worldleaders for SHM measurementsequipment. We can managecertification and authority approval,fabrication, FAT, installation, SAT,commissioning and startup,maintenance, remote access anddata storage.

Design verification [4]:

The most relevant parameters forvalidation of design assumptionsare modal parameters and loadings.Ramboll engineers identify modalparameters from measurementsand we use them for FEMverification. We perform monitoringof stochastic environmental loading,thus facilitating load verificationand calibration. More accurate

information about structural modeland loading is important input forbetter planning of inspections and,often, longer operational lifetimeprediction.

Structural re-assessment [5]:

In order to facilitate prediction ofthe remaining lifetime of thestructure, Ramboll engineers willperform FEM updating againstmeasured data. The overallbenefits are extension of theoriginal lifetime and possiblereduction in inspection plannings.Post-processing includes modalparameter identification, FE modelupdating, assessment of localfatigue issues, modal expansion,wave load calibration and facilitiesfor accumulated fatigue monitoring(fatigue counter).

Damage detection [6]:

Ramboll can develop and supplyonline damage detection tools forthe detection of structural changesin real time. An example of adetection output could be a SHMSindicator. In case the indicatorexceeds pre-defined thresholdvalues, an event warning will besent to the operator.

Reliability and risk-basedinspection planning [7]:

Managing the integrity of thecomplex structures, while at thesame time achieving their maximumlifetime, highest safety and minimalcosts, is a challenging task.Reliability and risk-based inspectionplanning is an acknowledged toolfor efficient structural maintenance.Ramboll’s team can develop cost-effective management solutions byintegrating data from SHMS into thereliability and risk-based inspectionplanning assuring optimalinspection intervals, and potentialfor large cost savings.

Selected references

[1] 'Nini/Cecilie platforms-Structural monitoring system'.Client: DONG Energy A/S[2] 'Root cause analysis for crackson the Siri Helideck'. Client: DONGEnergy A/S[3] 'Gorm D flare platforms-Structural monitoring system'.Client: Maersk Oil A/S[4] 'South Arne platform -Structural monitoring system'.Client: HESS Denmark[5] 'Valdemar BA jacket - Waveload calibration'. Client: Maersk OilA/S[6] 'SHMS for the Siri platform'.

Client: DONG Energy A/S.[7] 'Valdemar BA jacket - Wave loadcalibration'. Client: Maersk Oil A/S

About us

Ramboll Oil & Gas is a business unitwithin the Ramboll Group. Withmore than 35 years of experienceand over 1000 specialists, we arewell-established, independent andhighly regarded provider of offshoreand onshore engineeringconsultancy services for the oil andgas industry. We have offices inDenmark, Norway, Qatar, Russia,Abu Dhabi (U.A.E), US, UK andIndia.

Ramboll is certificated according toISO 9001, ISO 14001 and OHSAS18001.

More information and contacts:

Bjørn V. JønssonDirector of Department, MarineStructuresbvj@ramboll.com+45 5161 5321

Ulf T. TygesenTeam Leader, Marine Structuresutt@ramboll.com+45 5161 7398

RAMBOLL OIL &GASPhone: +45 5161 1000oil-gas@ramboll.com

www.ramboll.com/oil-gas

YOUR SUCCESSBEST REFERENCE

IS OUR

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• Accumulated fatigue monitoring (fatigue counter)

• Environmental load monitoring in real-time

• Damage detection and warning system

Lifetime extension beyond original design lifetime

Reduction of costs for in-service inspection planning

Our SHMS team of experts is looking forward to supporting you and providing high-quality consultancy services in all phases of your project.