AFT Application Topics

Centrifugal pumps are the most common type of pump used in piping systems. Basically, anything that is modeled with a pump curve is centrifugal. These pumps use an impeller to impart pressure on fluid flowing through them. 

AFT software allows users to model centrifugal pumps, fans, and compressors by inputting the respective curve. Based on the system hydraulics, the location of the curve on which the pump, fan, or compressor will operate is determined.

These calculations allow engineers to assess the suitability of a centrifugal pump, fan, or compressor by reporting a wide range of parameters including head rise, flow rate, NPSHA (for pumps), and speed, as well as efficiency, BEP, and NPSHR (for pumps) with additional input.

• AFT Arrow used centrifugal fans and compressors
• AFT Fathom & AFT Impulse use centrifugal pumps

In AFT Fathom, The Pump Properties window provides clear distinction between rotodynamic (or centrifugal) and positive displacement pumps. Note that PD pump models can calculate acceleration head in the suction line and AFT can also model multistage pumps with interstage takeoff flows.

The Hydraulic Institute wrote an article highlighting centrifugal pumps: https://www.pumpsandsystems.com/how-centrifugal-pumps-work