工业管道分类及等级划分要点.pdfVIP

Testpoint:Industrialpipelinee

ngineering-Classificationofindustrialpipelines

Industrialpipelinesrefertothepipelinesbelongingtoenterprisesandinstitutionsused

totransportprocessmedia.

PipelinelevelIndustrialpipelinesareclassifiedaccordingtodesignpressure,designtemperature,degreeof

mediumtoxicity,andfirerisk.1.Pipelinestransportingextremelyhazardousmedia,highlyhazardousgas

media,andhighlyhazardousliquidmediawithoperatingtemperatureshigherthantheirstandardboiling

points;GC12.PipelinestransportingfirehazardsofClassA,ClassBflammablegases,orClassAflammable

liquids(includingliquefiedhydrocarbons),andpipelineswithadesignpressureof≥4.0MPa;3.Pipesthat

transportfluidmediaotherthanthefirsttwomediaandhaveadesignpressureof≥10.0MPa,oradesign

pressureof≥4.0MPaandadesigntemperatureof≥400°C.GC2InadditiontothespecifiedGC3gradepipelines,

themediumtoxicitydegree,firerisk(flammability),designpressureanddesigntemperaturearelowerthanthe

specifiedGC1gradepipelines.GC3Pipestransportingnon-toxic,non-flammablefluidmedia,designpressure≤1.

0MPa,and-20°C＜designtemperature≤185°C

本节框架

Testpoint:Industrialpipeline

engineering-thermalpipeline

Corecontent:

1.Arrangementofthermalpipelines

2.Layingmethodofthermal

pipelines

2.Installationrequirementsfor

thermalpipelines

一、热力管道的布置形式

1）热力管道的平面布置主要有枝状和环状两类；

2）枝状管网比较简单，造价低，运行管理方便，其管径随着距热源距离的增加而减小；缺点

是没有供热的后备性能，即当管网某处发生故障时，将影响部分用户的供热；

3）环状管网的主要优点是具有供热的后备性能，但它的投资和钢材耗量比枝状管网大

得多；

一、热力管道的布置形式

4）对于不允许中断供汽的企业也可采用复线枝状管网，即用两根蒸汽管道作为主干线，

每根供汽量按最大用汽量的50%~75%来设计；一旦某根管道发生故障，可以提高蒸汽的初压

力，使