lng monitoring

Intelligent Solutions

• Pipeline leakage detection

•Regasificationandliquefactionmonitoring

•Tankannulusandbaseslabmonitoring

•Spillcontainmentcontrol

LNG MonitoringFiber-Optic Leakage Detection System

APSensingisyourglobalsolution

providerfortheDTS(distributed

temperaturesensing)market.Theheart

ofoursolution–basedon25yearsof

experienceastheleaderinopticaltest–

isauniqueandprovensolutionfor

precise,aroundtheclocktemperature

monitoring.

Apassiveopticalfiberisthetemperature

sensor,andletsyoumonitorprecise

temperatureprofilesalongthefiber–in

environmentswhereothersolutionsare

unabletodelivertheperformanceyou

need.

Imagineatemperaturemonitoringsolution

severalkilometerslongwiththousandsof

measurementpointsthatprovidecontinu-

ousmonitoringalongthelengthofthe

sensorcable.Imaginemeasurements

downtoone-halfmeterspatialresolution

Throughclosecooperationwithour

worldwidecustomerbase,wecontinuously

optimizeoursolution.Theresultisnot

justrobustandreliablesolutions,buta

relationbuiltontrustandanexpertwhois

thereforyouwithpost-salestrainingand

support.

Weworkwithestablishedregional

partnersaroundtheglobe–theirlocal

competenceensuresthatalldetails

ofacomplexprojectareplannedfor

inadvanceandexecutedontimeand

withinbudget.Takeadvantageofa

broadnetworkofopticalandsystem

managementexpertise,andenjoythe

peaceofmindthatcomeswithreliable

assetprotection.

withhighlyaccuratesensitivity–within

temperaturerangesthatareperfectly

suitedforpipelineenvironments.

Oursolutionisbasedonthequantum

mechanicalRAMANeffectcombinedwith

ourpatentedcode-correlationmeasure-

ments.Alaserpulsepropagatingthrough

thefiberresultsinback-scatteredlight

returningtothetransmissionend,where

itcanbeanalyzedandthetemperature

measured.

Thepurelypassiveopticalfiberisinstalled

inareasthatareusuallydifficulttoaccess,

andprovidesmaintenance-freeoperation

fordecades.

Itisthesumtotalofourtechnology–

sensorcables,assetvisualizationsoftware,

easeofintegrationintoyourownsitemoni-

toringsystem--thatultimatelyensures

worry-freepermanentmonitoring.

AP Sensing: Your trusted partner for LNG monitoring

DTS: A word about the technology

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APSENSINGadvanced photonic

DTS

Temperature

Asset Visualization

Fiber is the distributed sensor

Backscattered LightLaser Pulse

DetectorLaser

Glass molecules

Incident light

return signal wavelength

Brillouinscattering

Ramananti-Stokes signalStrong temperaturedependence

Raman Stokes signalWeak temperaturedependence

Brillouinscattering

retu

rn s

igna

l int

ensi

ty

T+

T−

T+T−

Fiber-opticDTStechnologyisuniquely

suitedtoavarietyofmonitoring

taskswithinanLNGterminalandis

recommendedforspillagedetectionin

section13.4ofEN1473:2007-06.By

makinguseofopticalsensingprobes,our

systemisnon-corrosiveandintrinsically

safe.Itaccuratelymeasurestemperature

overlargedistancesandissuitable

TheDTSsystemlocatesleaksinthe

internaltank.Thesensorfiberisdeployed

intheannulusbetweenthetwotankwalls

duringtankconstruction.Ifaleakoccurs,

cryogenicfluidcomesincontactwiththe

foroperationincryogenicconditions.

Becauseofthelongmeasurementreach,

theoptoelectronicDTSinstrument,with

itselectricalhardware,canbelocated

inaremotecontrolroom.Thissimplifies

compliancewithsafetyrequirementsand

ensuresefficientcommunicationlinkswith

otherterminaldatasystems.

sensingfiberlyingintheannulusspace.

Duetothelowtemperatureofthefluid,

theDTSsystemrapidlyidentifieseven

verysmallleaks.

AP Sensing’s DTS and LNG infrastructure

Tank leak detection

• ATEXcertificationdown

to Zone 0

• SIL-2 assessed by TÜV-

recognized consultants

• Provenfieldreliability

with industry’s lowest

maintenance and warranty

costs.

• Asset visualization software

for complete plant overview

24/7

• Ease of integration with

existing site monitoring

solutions

• Highest reliability

throughout the entire

operating temperature

range

• Extreme operating

temperature ranges

• Lowest laser output power

– inherently safe in case of

fiberbreaks


Alarm

Outer TankAssetVisualization

Inner Tank

Tank AnnulusMonitoring

Remotely-LocatedControl Room

DTS

Sensing Fiber

TheDTSmonitorstheentirepadareaand

heatingsysteminreal-timedowntoone-

halfmeterspatialresolution.Thesensor

cableisdeployedintheheatingelement

conduitwithinthepad,andprovides

temperaturedataeveryhalfmeteralong

itspath.

Inadditiontothemonitoringfunctionality,

thetemperaturedataalsominimizesthe

powerconsumption.Byidentifyinghotand

coldspots,heatingefficiencyisimproved.

Alarmsandsystemwarningsaretypically

setforbothabnormallyhighandlow

temperatures.

Base slab monitoring

Cryogenicfluidisquicklydetectedby

routingDTSsensorcablearoundthe

perimeterofthespillcontainmentareas.

Whenleakingmaterialreachesthe

containmentareas,thetemperature

decreases,triggeringanalarm.Thesystem

reportstheprecisealarmlocation.

Spill containment areas


Alarm

EmbeddedHeater ElementsAsset

Visualization

Sensing Fiber

Heater Controller Cold Spot

Base SlabMonitoring


DTS


Alarm

AssetVisualization

Spill Containment AreaMonitoring


DTS

Sensing Fiber

Pipeline monitoring

Ease of integration and site overview

APSensing’sDTSsolutioncanbefully

integratedintothesitemonitoringand

controlsystem.Thisbecomesimportant

whentheDTSislocatedsomedistance

Fromthejettytotheprocessareasandon

tothetanks:theAPSensingDTSsolution

providesthermalgradientinformation

duringcooldown–ensuringthatpipe

stressiskeptwithinspecifiedoperating

limits.Also,itidentifiespipeleakpoints

andpossibleinsulationproblemsthat

cannotbeseenbyavisualexamination.

Accuratetemperatureinformationcan

begeneratedintensecondintervals

providingrapidfeedbackforthermally

inducedpipestressduringcooldown.

fromthemaincontrolroom,forexample,

anATEXwall-mounteddevicelocated

nearatank,orarack-basedsysteminthe

jettycontrolroom.

A range of industry standard

communication protocols

are available to facilitate this

integration, including:

• Modbus TCP, RTU, ASCII

• IEC 60870-5-104

• OPC

• LabView

• ASCII File

• An open and fully

documented SCPI protocol

In addition to these protocols,

we have experience

implementing many different

types of communication:

• TCP/IP/Ethernet

• Serial interfaces (RS232,

RS485, RS422)

• Relay contacts

• Analogue input/output

• Wireless modem

• Radio link

• Satellite

• GSM Modem

• USB – direct link to PC

or laptop

The AP Sensing engineering

team can also assist with

custom communications if

required.

Cool-down Monitoring

Cool-down Gradient = Upper Temperature - Lower Temperature BA

Joint BoxJoint Box

Leak Detection Fiber Leak Detection Fiber

Lower Cool-downTemperature

Upper Cool-downTemperature

A

B

Theinstrumentdesignisbasedonalow

powersemiconductorlaserwiththelowest

opticaloutputpower(LaserClass1M)

foramaximumproductlifetime.Our

proprietarycodecorrelationconcept

providesthelongestmeasurementrange

onthemarket.

Additionally,ourDTSsolutionhasa

patentedsinglereceiverdesignthat

ensureslonglastingmeasurementstability

byeliminatingdrifteffectsassociatedwith

dualreceiverconcepts.Ouruniquedesign

avoidstheneedforsystemrecalibration.

Becauseitoperateswiththelowestoptical

outputpower,ourDTSsystemiseye-safe

andcertifiedforATEXZone0.Unlike

otherDTSinstruments,itcausesnoharm

incaseofafiberbreak,anditcanbe

deployedinexplosiveatmosphericareas

withoutadditionalsafetymeasures.

AP Sensing’s leadership in quality is based on intelligent design,proven components and decades of experience

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DTS

Temperature

Asset Visualization



DetectorLaser

Glass molecules


Alarm

APSensing’sDTSsolutionfitsyourLNGmonitoringdemandsandgivesyourplant

operatorspeaceofmind–yourvaluableassetsremainprotected!

AP Sensing’s advantages at a glance

Our experienceFromprojectplanningand

management,tocommissioning

andongoingserviceandsupport:

yourcompletesolutionproviderfrom

asinglesource. Sensorcablesthatfit your needsOurportfolioisspecificallysuitedto

pipelineapplications,includingsteel

sheathingandoperatingtemperature

rangesfrom-196°Cto+300°C.

Fiber optic sensing technologyReal-time,24/7monitoringforfast

leakdetection.

Intelligent definitionof alarm and zone parametersEfficienttrackingoftemperature

gradientsanduseofheating

systems.

Certifications ideally suited to LNGPlantsafetyandsecurityareassured

andallcompliancerequirementsare

met.

Integrated software, a real-time operating system and integrated alarmingNoviruses,nobluescreens,andno

dependencyonnetworkstability.

The most qualifiedand dependable DTS solution Stringenttestinganddecades

ofexperienceensurealongand

maintenance-freeproductlife.

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DTS

Temperature

Asset Visualization



DetectorLaser

Glass molecules

An intelligent instrument

design with quality

components,configuredfor

your requirements:

• Overall system MTBF value

is 33 years

• Semiconductor laser:

60 years at used pulse

method

• Switch: tested for

1000 million cycles,

the equivalent of hundreds

of years

• Genuine dual end operating

mode – two single

measurements result in one

automatically calibrated

temperatureprofile.

• Long term measurement

stability due to our unique

single receiver design.

Contact us for more information!

APSensingEMEAAPSensingAmericasAPSensingUK

APSensingChinaAPSensingKorea

Productspecificationanddescriptionsinthisdocumentsubjectto change without notice and are not binding to AP Sensing. © AP Sensing GmbH, 2012Printed in Germany

APSensingcertificationsensureyourcomplianceandsafety!

Withtheindustry’smostcompletesetofcertifications,APSensinghelps

youcomplytoallrelevantsecuritystandards,andensuresenvironmentaland

employeesafety.

ATEXCertificationdowntoZone0Ensuresthatoursensorcableandlasercontrollercanbeusedinpotentiallyexplosive

atmospheres.

SIL-2 AssessmentSafetyIntegrityLevel2ensuresAPSensingcomplianceforoperatorenvironments.

ULCertificationTheUnderwritersLaboratoriesensuresoverallproductsafety.

Laser SafetyIEC60825-1:2001

FDA acknowledgement for Laser SourcesClass1M;FDA21CFR;1040.10+;LaserNoticeNo.50

Electro-Magnetic CompatibilityIEC61326:2002

Environmental Testing IEC600068-2-6/-64;IEC60068-2-27

ISO 9001:2000 UL

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