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浏览：49次 | 提问时间： 08-04 11:58

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3个答案

衬人心欢L 08-04 11:59

屋面有组织排水规定，每50m㎡应设置直径100mm的排水管。

我想剪短发不再爱人渣 08-04 12:07

1. 先看暖气管道的材质，暖气管道材质一般有PPR管、铝塑管、和PB管。(1)PPR管耐腐蚀、耐热性好、质量轻、机械强度高、不易结垢，使用寿命长。并且现在市场上有PPR铝塑管，同时结合了PPR管和铝塑管的优点。(2)铝塑管保温性好、外壁不易被腐蚀，内壁光滑，从而对水流阻力小，并且可以随意弯曲，故方便施工，同时性价比也比较高。(3)PB管是一种高分子惰性聚合物，具有耐高温性、持久性、化学稳定性、可塑性、无味、无臭、无毒，不结垢、寿命长等特性，但是PB管的氧气渗透率比较高，需要阻氧。目前市场上都是阻氧PB管。2. 暖气管道的长度和管径的选择就要根据实际情况来选择了，一般管径越细、管道越长、阻力就越大，流速也就越低。

倾听心跳的旋律dfり 08-04 12:15

阀门一般都是用公称直径（DN***)标注的，比如DN150、DN100等。而管道有很多种标注方法，以外径、英制寸、公称直径等。只有把其他标注的尺寸转换成公称直径，那么阀门与管道就是一一对应了。常用的标注与公称直径的转换关系：1、塑料管类（U-PVC给水管、PPR管）：φ20-DNl5, φ25-DN20, φ32-DN25, φ40-DN32, φ50-DN40, φ63-DN50, φ75-DN65, φ90-DN80, φ11O-DNl00, φ160-DNl1502、无缝管：DN15-ф22mm，DN20-ф27mm DN25-ф34mm，DN32-ф42mm DN40-ф48mm，DN50-ф60mm DN65-ф76(73)mm，DN80-ф89mm，DN100-ф108mm DN125-ф133mm，DN150-ф159mm、DN200-ф219mm，DN250-ф273mm3、DN15---1/2---四分；DN 20---3/4---六分；DN 25---1 ----一寸；DN 32--1 1/4 ----一寸二；DN 40---1 1/2 ---一寸半；DN 50--- 2 ---二寸；DN 65--- 2 1/2 ---二寸半；DN 80--- 3 ----三寸二；DN 100--- 4 ----四寸；DN 125-- 5 ---五寸；DN 150--- 6 ----六寸；DN 200--- 8----八寸

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