Abstract: Under the situation that the type 3 m³B containers are used to collect enriched product from cascade at domestic uranium enrichment plants, and in the subsequent process, the product has to be distributed into several type 30B product cylinders from a type 3 m³B cylinder which is a non-standard large container. During the distribution process, the liquid dispensing link is hard to be fulfilled within a pressure tight device because there is existing of material leakage risk. In order to save such a problem, a theoretical model was established to calculate the internal pressure of a type 30B cylinder which is directly used to collect product from cascade. After different calculation of internal pressure taken for various type 30B product cylinders which are connected in parallel for collecting product，showing that it is feasible to directly use a type 30B cylinder to collect product. Taking the current cascade with a typical capacity as an example, for the leakage risk during the material is being collected by using the type 30B cylinder, a solution is proposed in addition to the accuracy of the theoretic model which is verified by experiments. As a conclusion, it is practical to directly use type 30B cylinders to collect the enriched material from cascade, and such experience could be extended in similar or subsequent plants.