露天开采中，穿爆作业安全的基本条件之一是爆破网路的传导和药包不发生拒爆。在使用微差延发爆破工艺时，多采用标准延洲和隔为20和25ms的РП－8型火工继爆管作爆破网路的延期装置。在起爆过程中，延期间隔时间是火工继爆管的决定性工艺参数。敷设爆破网路时，РП－8型继爆 In open-pit mining, one of the basic conditions for wearing blasting operation safety is that the transmission of the burst network and the kits do not occur. In the use of differential delay explosion blasting process, the use of more than the standard extension of the continents and separated by 20 and 25ms РП-8 type of explosion-proof pipe after blasting network delay device. In the detonation process, the delaying interval is the decisive process parameter of fireman and squib. When laying burst network, РП-8 type following the burst