【英文标准名称】:Audiovisualsystems-InteractiveTextTransmissionSystem(ITTS)(IEC61866:1997);GermanversionEN61866:1997
【原文标准名称】:视听系统.交互式电文传输系统(ITTS)
【标准号】:EN61866-1997
【标准状态】:现行
【国别】:
【发布日期】:1998-04
【实施或试行日期】:
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:数据传送;传输技术;字符集;编码;娱乐电子学;接口(数据加工);数据表示;文件交换;层;数据结构;视听设备;定义
【英文主题词】:Audiovisual;Audiovisualequipment;Charactersets;Datarepresentation;Datastructures;Datatransfer;Definition;Definitions;Encoding;Entertainmentelectronics;Interactive;Interactivetexttransmissionsystem;Interfaces(dataprocessing);ITTS;Layers;Textformats;Textinterchange;Textprocessings;Transmissiontechnique
【摘要】:
【中国标准分类号】:M11
【国际标准分类号】:33_160_99
【页数】:39P.;A4
【正文语种】:英语


【英文标准名称】:TestMethodforPerformanceTestingofExcessFlowValves
【原文标准名称】:溢流阀性能试验的试验方法
【标准号】:ANSI/ASTMF1802-2004
【标准状态】:现行
【国别】:美国
【发布日期】:2004-05-27
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:溢流阀;试验方法;阀门
【英文主题词】:Overflowvalves;Testmethods;Valves
【摘要】:Thistestmethodcoversastandardizedmethodtodeterminetheperformanceofexcessflowvalves(EFVs)designedtolimitfloworstopflowinthermoplasticnaturalgasservicelines.Alltestsareintendedtobeperformedusingairasthetestfluid.Unlessotherwisestated,allflowratesarereportedinstandardcubicfeetperhourof0.6relativedensitynaturalgas.ThetestmethodrecognizestwotypesofEFV.Onetype,anexcessflowvalve-bypass(EFVB),allowsasmallamountofgastobleedthrough(bypass)afterithastripped,usuallyasameansofautomaticallyresettingthedevice.Thesecondtype,anexcessflowvalve-nonbypass(EFVNB),isintendedtotripshutforminganessentiallygastightseal.Theperformancecharacteristicscoveredinthistestmethodincludeflowattrippoint,pressuredropacrosstheEFV,bypassflowrateoftheEFVBorleakratethroughtheEFVNBaftertrip,andverificationthattheEFVcanbereset.Gasdistributionsystemsmaycontaincondensatesandparticulatessuchasorganicmatter,sand,dirt,andironcompounds.FieldexperiencehasshownthattheoperatingcharacteristicsofsomeEFVsmaybeaffectedbyaccumulationsofthesematerials.ThetestsofSectionweredevelopedtoprovideasimple,inexpensive,reproducibletestthatquantifiestheeffect,ifany,ofauniformcoatingofkeroseneandofkerosenecontaminatedwithaspecifiedamountofferricoxidepowderonanEFV'soperatingcharacteristics.Excessflowvalvescoveredbythistestmethodwillnormallyhavethefollowingcharacteristics:apressureratingofupto125psig(0.86MPa);atripflowofbetween200and2500ft/h(5.66and70.8m/h)at10psig(0.07MPa);aminimumtemperatureratingof0F(-18C),andamaximumtemperatureratingof100F(38C).TheEFVscoveredbythistestmethodshallbeconstructedtofitpipingsystemsnosmallerthan1/2CTSandnolargerthan11/4IPS,includingbothpipeandtubingsizes.Testswillbeperformedat6710F(19.45.5C).Alternativeoptionaltesttemperaturesare10010F(37.75.5C)and010F(-185.5C).Allflowratesmustbecorrectedtostandardconditions.ThistestmethodwaswrittenforEFVsinstalledinthermoplasticpipingsystems.However,itisexpectedthatthetestmethodmayalsobeusedforsimilardevicesinotherpipingsystems.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificprecautions,seeSection.
【中国标准分类号】:J16
【国际标准分类号】:23_060_10
【页数】:
【正文语种】:英语