What is a ductile iron pipe fitting, I believe that many people do not know it very well. Simply put, this is actually a metal pipe produced by centrifugal processing of casting molten iron above No. 18. Because the metal pipe itself According to yo, there are many advantages, so now whether it is in the construction of tap water pipe network, sewage treatment or in the process of chemical medium transportation, the use of this kind of cast iron pipe fittings is very common. But how to ensure the use effect, Many people don't know it very well. In order to ensure the reliability of use, when laying this kind of ductile iron pipe fittings, relevant personnel should pay attention to determine the pipeline according to the degree of freezing, external load conditions, pipeline crossing and other factors. Burial depth. Generally speaking, the burial depth of this kind of nodular pipeline should be about 0.2 meters below the local freezing line. If the burial depth is too shallow, the service life and use effect of the pipeline will not be guaranteed. But if the If the spheroidal ink pipeline is buried too deep, the cost of pipeline laying will also be significantly increased.