DeDNdф的各自表示范围.doc

httpzhuzi2012taobaocom的各自表示范围httpzhuzi2012taobaocomhttpzhuzi2012taobaocom管聚丙烯管httpzhuzi2012taobaocom外径聚乙烯httpzhuzi2012taobaocom管铸铁管钢塑复合管镀锌httpzhuzi2012taobaocom钢管公称直径httpzhuzi2012taobaocom混凝土管公称直径无缝钢管公称直径其规格为如httpzhuzi2012taobaocom管径与httpzhuzi2012taobaocom区别是指管道的公称直径httpzhuzi2012taobaocom这既不是外径也不是httpzhuzi2012taobaocom内径应该与管道工程发展初期与英制单位有关通httpzhuzi2012taobaocom常用来描述镀锌钢管它与英制单位的对应关系如httpzhuzi2012taobaocom下分管英寸httpzhuzi2012taobaocom分管英寸httpzhuzi2012taobaocom寸管英寸httpzhuzi2012taobaocom寸二管又英寸httpzhuzi2012taobaocom寸半管又英寸httpzhuzi2012taobaocom两寸管英寸httpzhuzi2012taobaocom三寸管英寸很多地方也标为httpzhuzi2012taobaocom四寸管英寸加httpzhuzi2012taobaocom空间更多建筑精品日志httpzhuzi2012taobaocom主要是指管道外径一般采用httpzhuzi2012taobaocom标注的均需要标注成外径httpzhuzi2012taobaocom壁厚的形式主要用于描述无缝钢管httpzhuzi2012taobaocom等塑料管道和httpzhuzi2012taobaocom其他需要明确壁厚的管材拿镀锌焊接钢管为例用httpzhuzi2012taobaocom两种标注方法如httpzhuzi2012taobaocom下httpzhuzi2012taobaocomhttpzhuzi2012taobaocomhttpzhuzi2012taobaocomhttpzhuzi2012taobaocom我们习惯于使用httpzhuzi2012taobaocom来标注焊接钢管在不涉及到壁厚的情况下很少使用httpzhuzi2012taobaocom来标注管道但是标注塑httpzhuzi2012taobaocom料管就又是另外一回事了httpzhuzi2012taobaocom还是跟行业习惯有关实际施工过程中我们简略称呼的等管道均是指而不是指httpzhuzi2012taobaocomhttpzhuzi2012taobaocom别外据在现场的实践经验httpzhuzi2012taobaocom两种管道材料的连接方式不外乎丝扣连接及httpzhuzi2012taobaocom法兰连接镀锌钢管httpzhuzi2012taobaocom管均能采用以上两种连接只是小于的管道用丝扣较方便大于httpzhuzi2012taobaocom的用法兰比httpzhuzi2012taobaocom较可靠httpzhuzi2012taobaocom如果是两种不同材质的金属管道相连要考虑httpzhuzi2012taobaocom是否会产生原电池反应否则会加速活跃金属材料管httpzhuzi2012taobaocom道的腐蚀速度最好要用法兰连接并用橡胶垫片类httpzhuzi2012taobaocom的绝缘材质将两种金属分隔开包括螺栓都要用垫片httpzhuzi2012taobaocom分隔避免接触httpzhuzi2012taobaocom的区别httpzhuzi2012taobaocomhttpzhuzi2012taobaocom汉语拼音公的声母httpzhuzi2012taobaocom这下你就明白了httpzhuzi2012taobaocom是国产货有中国特色的国产货现httpzhuzi2012taobaocom在都不用了httpzhuzi2012taobaocom各种管子的不同标注方法httpzhuzi2012taobaocom水煤气输送钢管镀锌或非镀锌铸铁管等管材管径宜以公称直径表示如httpzhuzi2012taobaocomhttpzhuzi2012taobaocom无缝钢管焊接钢管直缝或螺旋缝铜管不锈钢管等管材管径宜以外径httpzhuzi2012taobaocom壁厚表示如httpzhuzi2012taobaocom等httpzhuzi2012taobaocom钢筋混凝土或混凝土管陶土管耐酸陶瓷管缸瓦管等管材管径宜以内径表示如httpzhuzi2012taobaocomhttpzhuzi2012taobaocom等httpzhuzi2012taobaocom塑料管材管径宜按产品标准的方法表示当设计均用公称直径httpzhuzi2012taobaocom表示管径时应有公称直径httpzhuzi2012taobaocom与相应产品规格对照表httpzhuzi2012taobaocom的关系httpzhuzi2012taobaocom量的是管道外壁的直径是httpzhuzi2012taobaocom减一半管壁的厚度得的数httpzhuzi2012taobaocom一般没人用管径应以httpzhuzi2012taobaocom为单位httpzhuzi2012taobaocom管径的表达方式应符合下列规定httpzhuzi2012taobaocom水煤气输送钢管镀锌或非镀锌铸铁管等管材管径宜以公称直径httpzhuzi2012taobaocom表示httpzhuzi2012taobaocom无缝钢管焊接钢管直缝或螺旋缝铜管不锈钢管等管材管径宜以外径httpzhuzi2012taobaocom壁厚表示httpzhuzi2012taobaocom钢筋混凝土或混凝土管陶土管耐酸陶瓷管缸瓦管等管材管径宜以内径httpzhuzi2012taobaocom表示httpzhuzi2012taobaocom塑料管材管径宜按产品标准的方法表示当设计均用公称直径httpzhuzi2012taobaocom表示管径时应有公称直径httpzhuzi2012taobaocom与相应产品规格对照表建筑排水用硬聚氯乙烯管材规格用httpzhuzi2012taobaocom公称外径公称壁厚表示httpzhuzi2012taobaocom给水用聚丙烯管材规格用httpzhuzi2012taobaocom表示公称外径httpzhuzi2012taobaocom壁厚httpzhuzi2012taobaocom塑料管在工程图上的标示公制标示httpzhuzi2012taobaocom以httpzhuzi2012taobaocom表示一般称为公称尺寸httpzhuzi2012taobaocom它不是管外径也不是httpzhuzi2012taobaocom管内径是外径与内径的平均值我们称平均内径例如外径的塑料管之公制标示httpzhuzi2012taobaocomhttpzhuzi2012taobaocom公制标示httpzhuzi2012taobaocom以表示管httpzhuzi2012taobaocom管之管外径以表示管httpzhuzi2012taobaocom管之管外径例如外径的塑料管之公制标示httpzhuzi2012taobaocomhttpzhuzi2012taobaocom对管httpzhuzi2012taobaocom管而言