Control Valve Technical Specification - ICEWeb

1 Control Valve Technical SpecificationControl ValveTechnical Specification Control valves Practical Guides for Measurementand Control edited by Guy Borden, Jr. and Paul , 1998 edition published by : Control Valve Technical Specification 2000 by CCI. All Rights Reserved. This document has been produced by Control ComponentsIncorporated, Rancho Santa Margarita, California based on subjects presented in the ISA Guide "ControlValves - Practical Guides for Measurement and Control " edited by Guy Borden, Jr. and Paul G. Friedmann,1998 edition published by ISA and other published sources.

2 The use of the letters ISA in thisspecification does not constitute an endorsement of this Specification by the InstrumentSociety of Valve Technical Specification5 Throughout this Specification , where the word shall is used to define a requirement,Seller must comply with the requirements. Where the word should is used todefine a requirement, Seller may select an alternative and advise Buyer ScopeThis Specification prescribes the minimum mandatory requirements governing thedesign, sizing, and selection of Control Equipment and services furnished by the Seller shall Design, fabrication, testing and delivery of all valves , complete withactuators and accessories to meet the requirements of this Specification andthe Control Valve data All interconnecting instrument tubing and fittings between the valveactuator.

3 Positioner, and filter Any special tools required for assembly, disassembly Valve drawings and calculations, including outline dimensions, weights,circuit diagrams, section drawings, part lists and Installation, operation, and maintenance manuals, including instructionsfor any Recommended spare parts Equipment and services furnished by the Buyer shall Receiving, unloading, storage, and installation of all equipment suppliedby Electrical wiring for power and signals for position indicating lights,solenoids, and/or Control All external piping, tubing, valves , and fittings, except as specified tobe furnished by the Conflicts and Any conflicts between this Specification and other applicable industrystandards, codes, and forms shall be resolved in writing by the Seller shall direct all requests to deviate from this Specification in writing tothe Buyer, who shall follow internal company procedure and forward such requestto the Engineering Manager.

4 Instrumentation and ValveTechnical Specification63 ReferencesThe selection of material and equipment, and the design and construction of theequipment covered by this Specification shall comply with the applicable edition ofthe references in effect at the time of the Purchase Order and as notedthroughout this The International Society for Measurement and ControlISA GuideControl valves , Practical Guides for Measurement and ControlISA Forms for Process Measurement and ControlInstruments, Primary Elements and Control ValvesISA Equations for Sizing Control ValvesISA Valve TerminologyISA Flow Characteristic and Rangeability of Control ValvesISA Valve Aerodynamic Noise PredictionISA for Evaluating Control Valve American Society of Mechanical EngineersASME Threads, General Purpose (inch)

5 ASME Pipe Flanges and Flanged FittingsASME and End-to-End Dimensions of ValvesASME Gaskets and Grooves for Steel Pipe FlangesASME Flanged, Threaded, and Welding EndASME PipingASME Plant and Petroleum Refinery PipingASME VIIIR ules for Construction of Pressure Vessels Division Fluid Control InstituteFCI 70-2 Control Valve Seat National Association for Corrosion Control (where applicable)NACE MR0175 Sulfide Stress Cracking Resistant Metallic Materials forOil Field International Electrotechnical CommissionIEC 534-8-3 Control Valve Aerodynamic Noise Prediction Manufacturer s Standardization SocietyMSS-SP-61 Pressure Testing of Steel TerminologyThe terminology and nomenclature used in ISA , Control ValveTerminology , and other ISA standards apply to this Valve Technical Specification74 Control Valve ApplicationsSeller shall select Control Valve design based on the requirements of theapplication.

6 Process operating conditions, and this ApplicationsApplications, common names and uses, and their key attributes covered underthis Specification are defined in Chapter 12 of the ISA Guide, Control valves ,Practical Guides for Measurement and Control and are summarized Process Control /Feed RegulationApplicationCommon Names and UsesFlow ControlFCV, ThrottlingLevel ControlLCV, Deareator, Heater DrainPressure ControlPCV, InjectionPressure ReductionPRVFlow RegulationFeed Regulator, Gas RegulatorKey attributes for process Control /feed regulation applications are accuracy ofcontrol resulting from small signal changes, and high rangeability resultingfrom increased pressure differentials that exist across the Control valveduring start-up, shutdown, and low-load process conditions.

7 Seller shallselect Control valves that meet these Continuous LetdownApplicationCommon Names and UsesAttemperationSprayBlowdownBDVFlow ControlFCV, Mixing, Steam SupplyChokeInjection, Withdrawal, Re-InjectionLetdownRich Amine, Drum, DrainLevel ControlLCV, Flash Tank, Separator LCVP ressure ControlPCV, Sootblower, Steam, ReducingPressure RegulationPRV, Steam SupplyThe key attribute for continuous letdown applications is accuracy of shall select Control valves that meet this Intermittent LetdownApplicationCommon Names and UsesAnti SurgeLoad RejectDumpAtmospheric Dump, Condenser Dump,Overboard DumpAuxiliaryAux.

8 SteamExtractionGas Withdrawal, Cavern WithdrawalReliefPRVB lowdownBDV, Steam Vent, Gas VentFlareGas to FlareStart-UpBypassTurbine BypassPRDSI njectionGas Injection, Steam InjectionLetdownDepressurizingpp. 417-419pp. 416-417pp. 412-415 Control ValveTechnical Specification8 Key attributes for intermittent letdown applications are tight shut-off and faststroke speeds. Seller shall select Control valves that meet these RecirculationApplicationCommon Names and UsesAnti SurgeCompressor Recycle, Spillback, Kickback, Surge ControlBypassStart-up, Vent, Turbine BypassRecirculationMini-flow, Leak-off, BFP RecirculationDumpOverboard DumpReturnLetdownKey attributes for recirculation applications are tight shut-off, anti-cavitationand/or low noise trim, and pipe vibration elimination.

9 Seller shall select controlvalves that meet these Process Operating Process DataFor each Control Valve , Buyer shall specify the process data for the followingthree flow conditions as a minimum: Normal Flow Rate, Maximum Flow Rate,and Minimum Flow Normal Flow RateThis flow condition is generally referred to as the design flow or materialbalance Maximum Flow RateThis flow condition shall be consistent with the plant or equipmentoperational maximum flow condition. The maximum flow condition isgenerally the governing case for required maximum Cv Minimum Flow RateThis flow condition shall be consistent with the plant turndownrequirement or equipment turndown capability.

10 The minimum flowcondition generally subjects the Control Valve to the highest differentialpressure condition. The minimum flow conditions are generally thegoverning case for the required trim shall also specify the minimum and normal flow conditions for controlvalve services identified with normally no flow as well as the required flowconditions during non-normal plant operating conditions such as start-up,venting, depressurizing, shall provide sizing calculations for all specified flow Data SheetsIndividual Control Valve Specification requirements shall be specified by Buyerand/or Seller on ISA Form data sheet (see Appendix A)