Pumps

About pumps

Pumps are mechanical devices designed to move fluids, whether liquids, gases, or slurries, by converting mechanical energy into hydraulic energy. They are broadly categorized by their operational principle into positive displacement and kinetic (dynamic) types. Positive displacement pumps, such as gear, diaphragm, and peristaltic pumps, trap a fixed volume of fluid and force it into the discharge pipe. Kinetic pumps, including centrifugal and axial-flow pumps, impart velocity to the fluid through an impeller, then convert that velocity into pressure. Key selection parameters include flow rate (typically in GPM or m³/hr), discharge pressure (PSI or bar), NPSH requirements, and fluid viscosity. Material compatibility is critical, with common construction materials including cast iron, stainless steel (304, 316L), bronze, and various polymers like PTFE or PVDF, chosen based on fluid corrosivity, temperature, and abrasiveness. Seal types, such as mechanical seals, packing, or sealless magnetic drive designs, are specified according to leakage tolerance and fluid characteristics. Drive mechanisms range from electric motors (AC/DC, single/three-phase) to pneumatic or hydraulic power sources, with considerations for RPM and power consumption (HP or kW). Connection types often conform to NPT, BSPT, or flange standards like ANSI B16.5.