Based on the plant fuild properties and the job site weather condition, tracing is not required for instrument and measuring piping.
根据本装置仪表所测物料的特点及当地气候条件，仪表及测量管路不需伴热。
Needle valve: it is an important instrument measuring piping system components, mainly cut-off valve and ball valve, its purpose is to open or cut off access by pipeline.
针型阀：是仪表测量管路系统中重要组成部分，主要有截止阀和球阀，其功用是作开启或切断管道通路用。
A measuring and locating system using microcontroller for cleaning piping is introduced in the paper.
介绍了一种用单片机控制的管道清洁检测及定位系统。
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