BROCHURE Pressure Relief A Proven Approach

—BROCHUREPressure reliefA proven approach

2PRESSURE RELIEF A PROVEN APPROACH—Pressure reliefPressure relief systems are a vital layer of protection for yourprocesses. To provide this protection, systems need to be welldesigned which is much more than sizing a relief valve.ABB has the capability and experience to assistyou wherever you are in your pressure relief lifecycle and whatever the size of the project.With our extensive industrial experience andunderstanding of the codes we can help you to:-- Demonstrate compliance to regulators-- Define and shape pressure relief studies-- Design new relief systems-- Review existing relief systems-- Reduce costs of modifications-- Review third party design-- Provide guidance and trainingABB understands the pressure operators areunder to ensure that their plant is safe, satisfiesregulatory requirements and the expense thatcan be incurred through plant modifications. ABBhas developed a suite of methodologies that areproven to be safe on thousands of relief streamsthroughout the world.The public and employees must be protectedfrom the hazards of high or low pressures and thepotential loss of containment of hazardousmaterial. Therefore, correctly designed andinstalled relief systems are critical to plant safety.The loss of production and damage from thefailure of pressure systems erode businessperformance.—“That disc always fails when westart up.”“That safety valve never seems toreset after it’s blown!”Above are comments you can sometimes hear onplants. Relief devices should be considered as thelast line of defense, not as a means of controllingthe process. So they should be called upon tooperate as little as possible.

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4PRESSURE RELIEF A PROVEN APPROACH—CapabilitiesABB’s complete range of pressure relief services are shown in theflowchart below.Relief philosophyIdentification ofpressure systemsIPS / HIPPS systemsContainment /inherently safe designPrioritisationData gatheringVendor dataVessel rating calculationDesignABB has the knowledge and experience to sizeand design pressure relief systems using industrycodes such as API or British European Standards.Pressure relief systems requires input frommechanical, piping, C&I and process engineers fora successful design. ABB has experiencedengineers in all of these disciplines.Retrospective reviewsUndertaking retrospective reviews of reliefdevices is different to designing them. However,many companies approach the workflow in thesame manner which can increase the durationand cost of a project. With a retrospective studythe question that needs answering is: “Is theinstalled device sufficiently sized?” rather thanthe design question: “What size should the reliefdevice be?” Using the ABB methodology whichstarts with the installed device saves time andcosts in data gathering and calculating reliefrates.Equipment thicknesschecksScenarioidentificationCalculation ofrelief ratesChemical reactionhazardsMulti-componentrelief ratesPressure drops andsystem capacityDisposal systemassessments- Ice hydrate- Vibration- KO drumMulti-scenarioidentification for flareand header systemsFlare and headersystem modellingDynamic analysisDepressurising studies

PRESSURE RELIEF A PROVEN APPROACHPrioritisationOperators review their relief stream designperiodically for a variety of reasons. There can behundreds of relief devices on an operating plant,which can be daunting to program and fund areview project. ABB has a prioritisationmethodology to rank the criticality of reliefdevices from a safety, environmental andbusiness aspects. From this programs and costscan be developed in line with available resources.AssuranceThe design of the pressure relief systems formajor modifications and greenfield new builds isnormally undertaken by the EPC contractors. ABBhas a methodology to work with the operator toreview the relief stream design and identifymistakes which can be corrected beforeconstruction. This has the potential to saveoperators significant costs from postconstruction modifications or incidents.Risk rankingThe results from a pressure relief study cangenerate a large and costly schedule ofmodifications. ABB can assist in reviewing thefindings from a study, risk rank the gap betweenthe installed system and the codes and identifyshort, medium and long term mitigationmeasures. This helps the operator identify thecritical ‘must do’ findings from a study and allowsthe site to plan and resource the correctiveactions that need to be done. Sometimes gapscan be resolved without costly modification tothe relief system such as re-rating pressureequipment or changing trip settings.5Discharge and disposalOn P&IDs relief systems are routed “To a safelocation”. This needs to be carefully consideredespecially when the material being relieved istoxic, flammable, hazardous etc. ABB uses avariety of calculation methods and softwaremodelling tools depending on the case to assistclients with this important but often forgottenaspect of pressure relief design.Vent and flare systemsPressure drops and pipework relief capacities areimportant aspects of a relief system’s design.Understanding the possible flowrates,compositions and pressures in vent and flaresystems is especially important to ensure reliefdevices are correctly specified and will performas expected. ABB has a suite of tools andmethodologies to review the design of vent andflare systems.Complex pressure reliefSome pressure relief scenarios are complex dueto issues such as high temperatures andpressures, phase changes and chemical reactionsetc. ABB has experience in determining the reliefrates for these more complex cases including:-- Exothermic and runway reaction using DIERSmethodology-- Multicomponent fire cases-- Gas filled vessels-- Dynamic simulation of relief scenariosOperational supportand troubleshootingPiping designReaction forcesPipe stressingDischarge and disposalConsequencemodelling dispersionand radiationDesign verificationRelief streaminspectionLegislation supportPER, PSSRGap risk assessmentand prioritisationPressure relieftrainingPressure reliefdesign guidesCompetencesupport

6PRESSURE RELIEF A PROVEN APPROACH—Pressure relief softwareABB licenses its PEL (Process Engineers’ Library) software to clients.This software can be used extensively in pressure relief studies.—01 CAPRE—02 ADRIAN—03 FLONET—04 PIPER—05 PROVUE DB—06 PHYSPACKCAPREdetermination of relief rates anddevice sizingADRIANupstream and downstreampressure drops and systemcapacity for compressible flowFLONETupstream and downstreampressure drops and systemcapacity for incompressible flowPIPERupstream and downstreampressure drops and systemcapacity for 2 phase flowPROVUE DBdatasheets and document controlPHYSPACKphysical properties for reliefscenarios and sizing—01—02—03—04—05—06

PRESSURE RELIEF A PROVEN APPROACH—Pressure relief servicesABB's pressure relief services include:Other ABB capabilities include:-- Pressure relief system auditing-- Pressure relief identification and calculation-- Process and mechanical design-- Vent collection system modelling and design-- DIERS methodology for two phase flow relief-- Pressure relief training (IChemE approved)-- Pressure relief design guides-- Instrument protective systems to IEC 61508,IEC 61511 and SIL determination-- Discharge and disposal systems-- Flare and vent system design-- Low pressure storage tank assessments-- Legislation support e.g. PED, PSSR-- Installation and in-service inspection-- Inspection-- Integrity management-- Operations improvement-- Process safety-- Project services-- Site and asset regeneration-- Technical engineering-- Technical software-- Technical training and competency7

—ABB Ltd.Daresbury ParkDaresburyWarringtonCheshireWA4 4BTUnited KingdomPhone: 44 (0)1925 741111E-Mail: contact@gb.abb.com Copyright 2017 ABB. All rights reserved.Projects and engineering/BRC011a/06/17abb.com/consulting

designed which is much more than sizing a relief valve. PRESSRE RELIEF A PROVEN APPROACH 3. 4 PRESSRE RELIEF A PROVEN APPROACH Design ABB has the knowledge and experience to size . Pressure relief software ABB licenses its PEL (Process