BS 7965-2000 工业气体用对角线路径通过时间超声波流量计的选择、装配、操作和校准

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【英文标准名称】:Theselection,installation,operationandcalibrationofdiagonalpathtransittimeultrasonicflowmetersforindustrialgasapplications
【原文标准名称】:工业气体用对角线路径通过时间超声波流量计的选择、装配、操作和校准
【标准号】:BS7965-2000
【标准状态】:作废
【国别】:英国
【发布日期】:2000-04-15
【实施或试行日期】:2000-04-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:尺寸公差;工作环境;校准;性能;选择;装配;流量计;气体流动;公式;超声波装置;误差修正;验证;渡越时间器件;工业的;传感器;流量测量;流量率
【英文主题词】:Calibration;Dimensionaltolerances;Environment(working);Errorcorrection;Flowmeasurement;Flowrates;Flowmeters;Formulae(mathematics);Gasflow;Gases;Industrial;Installation;Performance;Selection;Transducers;Transit-timedevices;Ultrasonicdevices;Verification
【摘要】:ThisBritishStandardprovidesguidanceontheselection,installation,operationandcalibrationofdiagonalpathtransittimegasultrasonicflowmeters(USMs)forindustrialgasapplicationsItisapplicableonlytothosedevicesinwhichtheentiregasstreamflowsthroughthebodyoftheUSMandthetransducersareincontactwiththefluid(wettedorinvasivetype).Thisincludesbothfull-boreandinsertiontypemetersemployingdirectorreflectivepaths.Itisalsoapplicableto"dirtygases"i.e.wherethegasiscontaminatedwithsolidsand/orliquidsinsmallquantities.Itisnotapplicabletoclamp-on/externallymountedmeters.NOTEAsanaidtoselection,thisstandardincorporatesanuncertaintyclassificationforUSMs.Thistakesintoaccountthecomponentsofuncertaintyrelatingtothemeterplusthoseadditionaluncertaintiesassociatedwithinstallationandoperationeffects.Therearefourclassificationsoffered.Theserangefromhighaccuracy"fiscal"applications(class1)togeneral-purposeprocessflowindicationandcontrolapplications(class4).
【中国标准分类号】:N12
【国际标准分类号】:17_120_10
【页数】:40P;A4
【正文语种】:英语

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MIL-B-81935A (AMENDMENT 1), MILITARY SPECIFICATION: BEARINGS, PLAIN, ROD END, SELF-ALIGNING, SELF-LUBRICATING, GENERAL SPECIFICATION FOR (19 APR 1991) [S/S BY SAE-AS81935]., This amendment forms a part of MIL-B-81935A, dated 1 June 1987and is approved for use by all Departments and Agencies of the Departmentof Defense.【英文标准名称】:StandardPracticeforDosimetryinGammaIrradiationFacilitiesforFoodProcessing
【原文标准名称】:食品加工用Υ辐照设备的剂量测定的标准实施规程
【标准号】:ASTMISO/ASTM51204-2004
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E10.01
【标准类型】:(ISO/ASTM)
【标准水平】:()
【中文主题词】:
【英文主题词】:absorbeddose;cobalt-60;cesium-137;dosemapping;dosimeter;dosimetry;foodirradiation;foodprocessing;gamma;installationqualification;ionizingradiation;irradiatedfood;irradiation;operationalqualification;performancequalification;radiati
【摘要】:4.1Foodproductsmaybetreatedwithionizingradiation,suchasgamma-raysfrom60Coor137Cssources,fornumerouspurposes,includingcontrolofparasitesandpathogenicmicroorganisms,insectdisinfestation,growthandmaturationinhibition,andshelf-lifeextension.Foodirradiationspecificationsalmostalwaysincludeaminimumormaximumlimitofabsorbeddose,sometimesboth:aminimumlimitissettoensurethattheintendedbeneficialeffectisachievedandamaximumlimitissetforthepurposeofavoidingproductorpackagingdegradation.Foragivenapplication,oneorbothofthesevaluesmaybeprescribedbygovernmentregulationsthathavebeenestablishedonthebasisofscientificdata.Therefore,priortotheirradiationofthefoodproduct,itisnecessarytodeterminethecapabilityofanirradiationfacilitytodelivertheabsorbeddosewithinanyprescribedlimits.Also,itisnecessarytomonitoranddocumenttheabsorbeddoseduringeachproductionruntoverifycompliancewiththeprocessspecificationsatapredeterminedlevelofconfidence.NOTE3-TheCodexAlimentariusCommissionhasdevelopedaninternationalGeneralStandardandaCodeofPracticethataddresstheapplicationofionizingradiationtothetreatmentoffoodsandthatstronglyemphasizetheroleofdosimetryforensuringthatirradiationwillbeproperlyperformed(1).4.2Somefoodproductsareprocessedinthechilledorfrozenstate.Therefore,dosimetersusedforroutineprocessingshouldbeselectedfortheirfunctionalityunderthoseconditions.Moreover,thetemperatureofadosimeterduringirradiationshouldbesufficientlystabletoallowcorrectionfortemperatureeffectsonthedosimeterresponse.Toavoidtheinfluenceoftemperaturegradientsondosimeterresponseandthesubsequentneedtocorrectfortheseeffects,methodsthatisolatethedosimeterfromtemperaturegradientsmaybeemployed.NOTE4-Formoredetaileddiscussionsofradiationprocessingofvariousfoods,seeASTMGuidesF1355,F1356,F1736,andF1885andRefs(1-11).4.3Toensurethatproductsareirradiatedwithinaspecifiedabsorbed-doserange,routineprocesscontrolrequiresroutineproductdosimetry,documentedproducthandlingprocedures(before,during,andafterirradiation),consistentorientationoftheproductsduringirradiation,monitoringofcriticalprocessparameters,anddocumentationofallrelevantactivitiesandfunctions.1.1Thispracticeoutlinestheinstallationqualificationprogramforanirradiatorandthedosimetricprocedurestobefollowedduringoperationalqualification,performancequalification,androutineprocessinginfacilitiesthatprocessfoodwithionizingradiationfromradionuclidegammasourcestoensurethatproducthasbeentreatedwithinapredeterminedrangeofabsorbeddose.Otherproceduresrelatedtooperationalqualification,performancequalification,androutineprocessingthatmayinfluenceabsorbeddoseintheproductarealsodiscussed.Informationabouteffectiveorregulatorydoselimitsforfoodproductsisnotwithinthescopeofthispractice(seeASTMGuidesF1355,F1356,F1736,andF1885).Note18212;Dosimetryisonlyonecomponentofatotalqualityassuranceprogramforadherencetogoodmanufacturingpracticesusedintheproductionofsafeandwholesomefood.Note28212;ISO/ASTMPractice51431describesdosimetricproceduresforelectronbeamandX-ray(bremsstrahlung)irradiationfacilitiesforfoodprocessing.1.2Forguidanceintheselectionandcalibrationofdosimetrysystems,andinterpretationofmeasuredabsorbeddoseintheproduct,seeISO/ASTMGuide51261andASTMPracticeE666.Fortheuseofspecificdosimetrysystems,seeASTMPracticesE1026andE2304,andISO/ASTMPractices51205,51275,51276,51310,51401,51538,51540,51607,51650,and51956.Fordiscussionofr......
【中国标准分类号】:
【国际标准分类号】:67_020
【页数】:10P.;A4
【正文语种】:英语