Centrifugal blower manufacturers should provide curves which show a collection of surge points for varying speeds and pressures. This line is called the surge line. This is the point where the blower will start to experience surge and should not be a point in your design.

Nov 8, 2016 · Surge Terminology in Centrifugal Compressors: •Throttle Surge – When flow across the compressor drops till the surge line while maintaining constant pressure. • To prevent such occurrence, the bypass valve is open before reaching the surge point.

Compressor surge is a form of aerodynamic instability in axial compressors or centrifugal compressors. The term describes violent air flow oscillating in the axial direction of a compressor, which indicates the axial component of fluid velocity …

Surge in a centrifugal blower or exhauster is similar to “pump cavitation” in a liquid pump. There are actually two types of surge, volumetric surge and pressure surge. While they are in most ways similar, their cause in a system can differ. The design of the first impeller in the blower really determines the surge point.

Centrifugal Blower Turndown • Surge is a pulsating air flow and pressure that occurs in centrifugal blowers at low air flow rate or high pressure • The occurrence of surge greatly increases blower temperature • Surge pulsations can also cause vibration and mechanical damage to the blower • High impeller speed increases sensitivity to ...

May 15, 2019 · Centrifugal and axial compressors can experience a potentially destructive condition known as surge. Emerson’s Mikhail Ilchenko describes it for me.

Jun 2, 2022 · You may ruin your fan/blower if you operate within the surge zone. For an operating point of 5% of rated flow, if the blower/ fan is still within the surge zone, install a min flow recycle line. If this is in air service, the min flow could direct excess air to open air.

Jul 27, 2021 · Providing effective surge control is a concern for all centrifugal blowers. Surge is a pulsating flow condition occurring at low flow and high pressure. It can cause blower failure in a short time. Surge control consists of monitoring flow and taking corrective action.

Anti-surge control keeps the flow through the compressor above the surge point by adjusting a blow off vent (for air blowers) or recycle control valve. The surge point is obtained from the compressor performance curves or from compressor surge testing.

Nov 2, 2010 · This is about a multistage centrifugal blower that is to be used for WWTP applications. It is a fixed speed unit, no VFD and we use an inlet throttle valve. Blower is controlled by the pressure in the header going to the basins.