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lng moniroting
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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
1 2 3 4
Zones
5 6 ...
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
APSENSINGadvanced photonic
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
APSENSINGadvanced photonic
Alarm
EmbeddedHeater ElementsAsset
Visualization
Sensing Fiber
Heater Controller Cold Spot
Base SlabMonitoring
Remotely-LocatedControl Room
DTS
APSENSINGadvanced photonic
Alarm
AssetVisualization
Spill Containment AreaMonitoring
Remotely-LocatedControl Room
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
1 2 3 4
Zones
5 6 ...
APSENSINGadvanced photonic
DTS
Temperature
Asset Visualization
Fiber is the distributed sensor
Backscattered LightLaser Pulse
DetectorLaser
Glass molecules
APSENSINGadvanced photonic
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.
1 2 3 4
Zones
5 6 ...
APSENSINGadvanced photonic
DTS
Temperature
Asset Visualization
Fiber is the distributed sensor
Backscattered LightLaser Pulse
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
www.apsensing.com