What is Np3 and Np4 rcc hume pipe?

Np3 and Np4 refer to different classes of Reinforced Cement Concrete (RCC) hume pipes, which are commonly used for drainage and sewage applications. The classification is based on the pipe's load-bearing capacity, with Np3 being suitable for lighter loads and Np4 for heavier loads. These pipes are designed to withstand various environmental conditions and are manufactured to specific standards for durability and strength. The choice between Np3 and Np4 depends on the intended application and the expected load conditions.