JB 2598-1979 直流避雷器技术条件
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来源:标准资料网
基本信息
标准名称: | 直流避雷器技术条件 |
中标分类: |
电工 >>
输变电设备 >>
避雷器 |
发布日期: | |
实施日期: | 1992-07-01 |
首发日期: | |
作废日期: | |
出版日期: | |
页数: | 7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: 电工 输变电设备 避雷器
MIL-P-26366A, MILITARY SPECIFICATION, PROPELLER SYSTEMS, AIRCRAFT, GENERAL SPECIFICATION FOR (15 NOV 1962)., This specification covers standard requirements and test for aircraft propeller systems.【英文标准名称】:StandardTestMethodforOpenChannelFlowMeasurementofWaterIndirectlybyUsingWidthContractions
【原文标准名称】:使用收缩宽度法迂回测量明渠水流流量的标准试验方法
【标准号】:ASTMD5129-1995(2003)
【标准状态】:现行
【国别】:
【发布日期】:1995
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:D19.07
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:喷管流量;测量
【英文主题词】:flood;openchannelflow;waterdischarge
【摘要】:Thistestmethodisparticularlyusefultodeterminethedischargewhenitcannotbemeasureddirectlybysometypeofcurrentmetertoobtainvelocitiesandwithsoundingweightstodeterminethecrosssection.Evenunderthebestconditions,thepersonnelavailablecannotcoverallpointsofinterestduringamajorflood.Theengineerortechniciancannotalwaysobtainreliableresultsbydirectmethodsifthestageisrisingorfallingveryrapidly,ifflowingiceordebrisinterfereswithdepthorvelocitymeasurements,orifthecrosssectionofanalluvialchannelisscouringorfillingsignificantly.Undertheworstconditions,accessroadsareblocked,cablewaysandbridgesmaybewashedout,andknowledgeofthefloodfrequentlycomestoolate.Therefore,sometypeofindirectmeasurementisnecessary.Thecontracted-openingmethodiscommonlyusedonvalley-floorstreams.1.1Thistestmethodcoversthecomputationofdischarge(thevolumerateofflow)ofwaterinopenchannelsorstreamsusingbridgesthatcausewidthcontractionsasmeteringdevices.1.2Thistestmethodproducesthemaximumdischargeforoneflowevent,usuallyaspecificflood.Thecomputeddischargemaybeusedtohelpdefinethehigh-waterportionofastage-dischargerelation.1.3Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.TheSIunitsgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A52
【国际标准分类号】:
【页数】:42P.;A4
【正文语种】: