小口径管道的焊后热处理p.ppt

PWHTofSmallDiameterPipe小口径管道的焊后热处理INTRODUCTION简介CheckListofImportantItems检查重要项目的一览表ProblemAreaRegardingSmallDiameterPWHT关于小口径管道的焊后热处理中问题点Thefollowingslideshowpresentationshowsavailableoptionsinregardsto:以下的幻灯片介绍了有关的可选用的多种选择Inmostcases,thevalveshouldbetakenapartandthevalvefacetapedusingducttape.大多数情况下，阀门应该拆开，并且阀兰面应该用柔性带子包扎起来Theuseofpipenipplesupportforheaterpad.使用管接头支撑加热片Thiswillkeeptheheaterpadfromoverlappingitself这样可以避免使加热片的自身重叠AnotherexampleofaweldednipplespacertobeusedforPWHTofsmalldiameterpipe.另一个例子当进行小管径的焊后热处理时，使用一个焊接的管接头作为垫块AttachtheTCsonthevalvebodyoppositesideofthevalveface.AftercompletionofTCattachment,thepipespacersareinstalled.在法兰面的反面把热电偶连接到阀门本体上，安装完热电偶附件后，安装管道隔离片ThefollowingpicturesshowtheTCplacementandpipespacers.以下图片显示了热电偶的附件和管道垫块AttachthetwosetsTCsonthevalvebodyoppositesideofthevalveface.在法兰面反面的本体上连接两套热电偶Extracareinassuringproperthermocoupleattachmentisamustonsmalldiameterpiping.特别关注的是，确保合适热电偶连件必须连接到小管径管道上Anotherexampleofinstallingheatpadsupportsusingtapeandwire.另外一个例子是使用带子和铁丝安装加热垫子的支撑件OncetheTCandpipespacersareinstalled,installationoftheheatpadisnext.一旦热电偶和管子隔离片安装完成后，下一步是安装加热片Heatpadinstallationmustbe“installedandattached”withcaremakingsuretheheatpadiswrappedaroundpipefirstthenaroundthespacers.Asnugfitisamustwithnooverlapoftheheaterelements.加热片必须注意“安装并且连接上”，以确保加热片首先绑扎在管道然后是隔离块上。加热元件之间必须平滑过渡没有重叠InstalledTC,spacerandheatpad,readyforinsulation安装热电偶，隔离块和加热片后，准备保温Theheatpadiswrappedaroundthevalve,pipespacer,andpipe.Endsofheatpadarelocatedonthespacersides.加热片沿着阀门、管道垫块和管子绑扎，加热片的末端位于垫块的一侧Remembertheheatpadhasasnugfitaroundthepipeandspacer.注意加热片在管子和隔离片周围有平滑的过渡Installationoftheheatpadaroundthepipe,valve,andgussetinaverticalposition在垂直位置沿着管道，阀门和支撑件安装加热片Installationoftheheatpadaroundvalveandgusset.在阀门和支撑件周围安装加热片Installationoftheheatpadaroundthepipe,valve,andgussetinahorizontalposition.在横向位置沿着管子，阀门和支撑件周围安装加热片Afterusingglasstapetoholdtheheatpadinposition,wireisusedtosecuretheheaterends.使用玻璃纤维带子把加热片固定好位置后，用铁丝固定加热器末端Whenheatpadsareinstalledintheverticalposition,extr