如何更好学习水电安装预算

《如何更好学习水电安装预算》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、怎样学习水暖电安装预算第一章      管道施工图识读1.      设计规范要求，暖气支管不得小于DN20。2.      保温常规做法――给水：防结露保温，热水：保温，消防：不保温，冷冻水：连阀门都需保温，冷却水：按设计要求，未要求可以不作。一般吊顶里的管道均需保温。给水：暗敷防结露保温；明敷穿越门厅、卧室和客厅过门处必须做防结露保温。排水：暗敷做防结露保温；明敷公共厕所座便上反水弯必须做。管井里除消防、喷洒管道管道外均做保温。3.      镀锌钢管连接方式：《DN100丝接，>DN100可焊接（需防腐），可法兰焊接（需二次镀锌），少

2、量可丝扣法兰连接。4.      管道外皮距墙距离为25-50mm。5.      采暖干管接立管时，当立管直线管段<15m时，采用2个90。弯头，当直线管段>15m时采用3个90。弯头。6.      施工时，排水管宁高勿低，地漏宁低勿高。7.      标高规定：室内管道一般为管中，室外管道排水为管内底，给水为管顶。8.      暖气片中应与窗同轴。9.      闸阀：开关作用，阻力系数0.5；截止阀：调节开关作用，阻力系数19。10.      补偿器分为：自然补偿，方型胀力，弯头，波纹补偿器，套筒补偿器，球型胀力，角质胀力。11

3、.   edgesshouldbecleaned,aftermakingsurethatnodefectshallbemarkedwithamarkerpentowritedownweldingneartheweld,includingthesloganofwelding,welders,etc.(16)weldingQianPreheatandtheweldingHouheattreatmentpipeweldingQianPreheatandtheweldingHouheattreatmentprocessconditionsweldi

4、ngQianPreheatandtheweldingHouheattreatmenttemperaturetableprojectmaterialweldingQianpreheattemperature(℃)weldingHouheattreatmentandtheinsulationtime(℃/H)wallthick(mm)temperature(℃)wallthick(mm)temperature(℃)20≥26100~200>36600~650/1-1.515CrMo≥10150~200>10670~700/1.2-2Prehea

5、tandtheheattreatmentprocessinthe,Innerandouterwalltemperatureshallbekeptuniform,inordertoavoidinternalstresses.Preheatingbeforeweldingandpostweldheattreatment,shallmeasureandrecordthetemperature,temperaturemeasurementlocationsandnumberofpointsarereasonable.Pronetowelddelay

6、edcrackofsteel,postweldheattreatmentafterweldingshouldbecarriedoutpromptly,whennotconductingtimelypostweldheattreatment,shouldbeuniformlyheatedto200~300℃immediatelyafterweldingandinsulationandslowcooling,...26mmmorethan20steelpipeweldingpreheatingbeforeweldingshouldbecarri

7、edout,36mmtheaboveheattreatmentafterweldingshouldbedone.Beforeweldingandheattreatmentusedoxyacetyleneflameheating,heattreatmentafterweldingusingspecialheattreatmentafterweldingequipment.Hardnessafterheattreatmentofweldsneededtesting.6.5.4sidesofthedissimilarsteelweldingwhe

8、nwerenon-austeniticsteelorausteniticsteel,alloycontentaccordingtoloweronesideofthebasemet