Download - Stringent Insurer Safety Requirements met with …...level within their two steam drums. However, after a recent review, the plant’s insurers were concerned that if the DCS was to

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

[email protected]

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