This complete guide introduces pump casing as a key component in industrial pumps. It explains the definition, main functions including fluid containment, flow direction, pressure conversion and internal parts protection. It also covers working principles, common types such as volute and diffuser casings, material options like cast iron and stainless steel, and practical selection steps based on fluid properties and working conditions. In addition, it provides installation and maintenance tips and modern design innovations to help engineers choose and manage pump casings efficiently.

This article provides a complete technical guide to pump impellers, covering their definition, working principle based on centrifugal force, structural classifications including open, closed, semi-closed and channel impellers, and flow direction types such as radial, axial and mixed flow. It also introduces common impeller materials like stainless steel, cast iron, plastic and brass, along with their applications in water supply, HVAC, sewage treatment and industrial systems. Key selection factors and maintenance tips are included to help engineers and users choose the right impeller for flow rate, head, fluid condition and operating environment, improving pump efficiency and service life.