QJ 2586.1-1993 立方氮化硼/硬质合金焊接式外圆车刀
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来源:标准资料网
基本信息
标准名称: | 立方氮化硼/硬质合金焊接式外圆车刀 |
中标分类: |
机械 >>
工艺装备 >>
刀具 |
ICS分类: |
机械制造 >>
切削工具 >>
车刀
|
发布日期: | 1993-03-20 |
实施日期: | 1993-11-01 |
首发日期: | |
作废日期: | |
出版日期: | |
页数: | 11页 |
适用范围
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前言
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目录
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引用标准
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所属分类: 机械 工艺装备 刀具 机械制造 切削工具 车刀
【英文标准名称】:StandardPracticesforSamplingWaterfromClosedConduits
【原文标准名称】:从关闭水管中的抽取水样的标准实施规程
【标准号】:ASTMD3370-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D19.03
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:backpressureregulator;pressurereducer;samplecooler;sampling;samplingequipment;variablerod-in-tubeorifice;water;Backpressureregulator;Chelation;Closedconduits;Equipment(forsamplingwater);Fieldtesting--water;Graphitefurnacea
【摘要】:Thegoalofsamplingistoobtainforanalysisaportionofthemainbodyofwaterthatisrepresentative.Themostcriticalfactorsnecessarytoachievethisarepointsofsampling,andmaterialsselection,systemdesign,timeofsampling,frequencyofsampling,andproperprocedurestomaintaintheintegrityofthesamplepriortoanalysis.Homogeneityoftheprocesstobesampledisfrequentlylacking,necessitatingmultiple-pointsampling.Ifitisimpracticaltoutilizeamost-representativesamplingpoint,itmaybepracticaltodetermineandunderstandinterrelationshipssothatresultsobtainedataminimumnumberofpointsmaybeusedtocharacterizethesystem.Samplescollectedfromasinglepointinasystemarealwaysrecognizedasbeingnon-representativetosomedegree.Forthisreason,totalrepresentativenessofsamplescannotbeaprerequisitetotheselectionofasamplingpoint.Thedegreeofrepresentativenessofthesampleshallbeassessedandtheassessmentmadeapartofthepermanentrecord.Thiswillpreventanartificialdegreeofaccuracyfrombeingassignedtothedataderivedfromtestsonthesample.Thesamplesshallbeofsufficientvolumeandshallbetakenfrequentlyenoughtopermitreproducibilityoftestingrequisiteforthedesiredobjective,asrequiredbythemethodofanalysistobeused.LaboratoriesorfacilitiesconductingwatersamplingshouldbeincompliancewithGuideD3856.1.1Thesepracticescovertheequipmentandmethodsforsamplingwaterfromclosedconduitssuchasprocessstreamsatpowerstationsforchemical,physical,microbiological,andradiologicalanalyses.Itdoesnotcoverspecializedequipmentrequiredforanduniquetoaspecifictestormethodofanalysis.Thefollowingareincluded:
Sections
PracticeAx2014;GrabSamples
9to17
PracticeBx2014;CompositeSamples
18to23
PracticeCx2014;ContinualSampling
24to29