POWER MOBREY HYDRASTEP
Stringent Insurer Safety Requirements met with Mobrey Hydrastep Steam Drum Level Monitoring
RESULTS
•Increasedsafety
•Compliancetoinsurer’srequirements
•Redundantlevelmeasurement
•Clear,continuouslevelindication
“The Hydrastep systems are reliable and the insurers are happy.”
APPLICATION
Steamdrumlevelmeasurement
CUSTOMER
Awastetreatmentspecialistcompany,France
CHALLENGE
AnewlyconstructedwastetreatmentplantwasthefirstofitskindinFrance.Theplantprocessesover400,000tonsofmunicipalwastefromtheMarseilleprovince.Thewasteissortedintoplastics,metals,organicandcombustiblematerials.Theorganicwasteisusedtoproducebio-gasandcompost,andthecombustiblewastefuelsthefurnacetocreatesupercriticalsteamwhichisusedtogeneratepower.Thispoweristhensoldontothenationalelectriccompany.
Anysteamraisingplantwillusesteamdrums,andthesesteamdrumsrequireaccurateandreliablelevelmeasurementtoensurethesafetyoftheplant.Thewastetreatmentplantwasalreadyusingdifferentialpressure(DP)transmitterstomeasureandcontrolthelevelwithintheirtwosteamdrums.However,afterarecentreview,theplant’sinsurerswereconcernedthatiftheDCSwastofail,theDPmeasurementwouldbelostandtherewouldbenowayofknowingthelevelwithinthesteamdrum.Thiscouldleadtothesteamdrumrunningdry,orrisinglevelandwaterenteringthesteamturbine,bothcriticallydangeroussituations.TheinsurersinsistedonanadditionalmeasurementonthesteamdrumwhichwouldbeindependentoftheDCS.
SOLUTION
Theplant’soperatorsapproachedEmersonTM forasolution.EmersonproposedtheMobreyHydrastep,aproductdesignedspecificallyforthisapplication.OneHydrastepsystemwastobefittedtoeachsteamdrum.Thetwo-inputboardoptionwaschosenfordualredundancy;shouldoneboardfail,theotherwouldcontinuetooperateandprovidealevelmeasurement.
Illustration showing the Hydrastep system
POWER
TheHydrastepiscapableofinterfacingwiththeDCS,butitwasdecidedtokeepitindependentincasetheDCSwastofail.Remotedisplayswerepositionedinthecontrolroomtogiveaclearandcontinuousindicationofthelevelineachdrum.
Theplant’sinsurerswerecontentthatHydrastepwouldgiveareliablelevelmeasurementandwouldenablethecustomertocontinuethesafeoperationoftheirplant.
Mobrey Hydrastep 2468 Electronic Steam and Water Gauging System
Delta Mobrey Limited
Riverside Business Park, Dogflud Way
Farnham, Surrey, GU9 7SS, UK
+44 (0)1252 729 140
+44(0)1252 729 168
Linkedin.com/company/Delta-Mobrey
Twitter.com/Delta-Mobrey
Facebook.com/Delta-Mobrey
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