目前,美国自来水厂协会AWWA颁布有四种混凝土压力管标准——C300;C301;C302;C303。按照这四种标准生产的管子主要是用来输水的,也可以输送其它介质。下面分别介绍这四种标准: 一、有钢筒钢筋混凝土压力管(C300) 这是一种普通钢筋混凝土压力管,管壁内带一钢筒,如图1所示。 At present, the American Water Works Association AWWA has issued four standards for concrete pressure pipes: C300, C301, C302, and C303. Pipes produced in accordance with these four standards are mainly used to transport water, but can also transport other media. The following describes the four standards: First, there is a steel reinforced concrete pressure pipe (C300) This is an ordinary reinforced concrete pressure pipe, with a steel tube in the wall, as shown in Figure 1.