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管径|DN、De、Φ分别表示什么?有什么区别?

返回列表 来源:本站 发布日期: 2021-11-01 12:52:24

管径|DN、De、Φ分别表示什么?有什么区别?一文搞懂!

DN 、De、Φ都表示什么?
 01  DN是指管道的公称直径  
通常用来描述:镀锌钢管
公称直径可用公制mm表示,也可用英制in表示。管路附件也用公称直径表示,意义同有缝管。它与英制单位的对应关系如下: 

公称通径(nominal diameter),又称平均外径(meanoutside diameter)。这是缘自金属管的管璧很薄,管外径与管内径相差无几,所以取管的外径与管的内径之平均值当作管径称呼。
DN是公称通径,公称通径(或叫公称直径),就是各种管子与管路附件的通用口径。公称通径是供参考用的一个方便的圆整数,与加工尺寸仅呈不严格的关系。同一公称直径的管子与管路附件均能相互连接,具有互换性。它不是实际意义上的管道外径或内径,虽然其数值跟管道内径较为接近或相等。
例如:焊接钢管按厚度可分为薄壁钢管、普通钢管和加厚钢管。其公称直径不是外径,也不是内径,而是近似普通钢管内径的一个名义尺寸。每一公称直径,对应一个外径,其内径数值随厚度不同而不同。
 02   De主要是指管道外径  
主要用于描述:无缝钢管、PVC等塑料管道、和其它需要明确壁厚的管材
一般采用De标注的,均需要标注成外径X壁厚的形式。
拿镀锌焊接钢管为例,用DN、De两种标注方法如下: 
DN20 De25X2.5mm
DN25 De32X3mm
DN32 De40X4mm
DN40 De50X4mm
我们习惯于使用DN来标注焊接钢管,在不涉及到壁厚的情况下很少使用De来标注管道;但是标注塑料管就又是另外一回事了;还是跟行业习惯有关,实际施工过程中我们简略称呼的20、25、32等管道均是指De,而不是指DN。
另外据在现场的实践经验:
a、两种管道材料的连接方式不外乎:丝扣连接及法兰连接。 
b、镀锌钢管、PPR管均能采用以上两种连接,只是小于50的管道用丝扣较方便,大于50的用法兰比较可靠。


ps:如果是两种不同材质的金属管道相连,要考虑是否会产生原电池反应,否则会加速活跃金属材料管道的腐蚀速度,最好要用法兰连接,并用橡胶垫片类的绝缘材质将两种金属分隔开,包括螺栓都要用垫片分隔,避免接触。
Φ还能表示管材的外径,但是此时应该在其后面乘以壁厚。
 03   Φ表示普通圆的直径
当然了,Φ还能表示管材的外径,但是此时应该在其后面乘以壁厚。如:Φ25×3,表示外径为25mm,壁厚为3mm的管材。
对无缝钢管或者有色金属管道,应标注“外径×壁厚”。如:Φ107×4,其中Φ可省略。
中国、ISO和日本的部分钢管标注采用壁厚尺寸表示钢管壁厚系列。对于这类钢管,表示方法为管外径×壁厚。如:Φ60.5×3.8
各管材公称直径和外径对照表


DN 、De、Dg、Φ 的区别
DN Nominal diameter
De external diameter
Dg diameter gong(汉语拼音“公”的声母) 这下你就明白了,Dg 是国产货, 有中国特色的国产货,现在都不用了。
  DN 、De、Dg 、Φ的关系  
De 量的是管道外壁的直径
DN 是 De 减一半管壁的厚度得的数 
Dg 一般没人用

Φ表示普通圆的直径
管径应以 mm 为单位,管径的表达方式应符合下列规定:
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DN表示;
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×壁厚Φ表示;
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 d 表示;
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 DN 表示管径时,应有公称直径 DN 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 de(公称外径)×e(公称壁厚)表示(GB 5836.1-92),给水用聚丙烯(PP)管材规格用 de×e 表示(公称外径×壁厚) 塑料管在工程图上的标示。
公制标示 ( metric dimension size )
以DN表示 一般称为“公称尺寸”,它不是管外径、也不是管内径。是外径与内径的平均值,我们称平均内径。
例如:外径 63mm 的塑料管之公制标示 ( mm dimension size ) DN50
ISO 公制标示 ( ISO metric dimension size )
以 Da 表示 PVC 管,ABS 管之管外径
以 De 表示 PP 管,PE 管之管外径
例如:外径 63mm 的塑料管之公制标示 ( mm dimension size ) 
Da63 对 PVC 管,ABS 管而言。
总结:De、DN、d、ф的各自表示范围!
De-- PPR、PE管、聚丙烯管 外径 
DN-- 聚乙烯(PVC)管、铸铁管、钢塑复合管、镀锌钢管公称直径 
d -- 混凝土管公称直径 
ф-- 无缝钢管或者有色金属管道应标注“外径×壁厚”

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