#Pump #centrifugal pump, #suction #Discharge #refinary #NPSH #Cavitation #Pump layout #Pump piping.

#Pump #centrifugal pump, #suction #Discharge #refinary #NPSH #Cavitation #Pump layout #Pump piping. #ActivePipingKnowledge Follow me On Instagram Instagram https://instagram.com/afzaldanish2011... www.linkedin.com/in/afzaldanish2011 #pump #refinary #oil #pump #suction #discharge #vertical line #sump For any Query, please contact [email protected] https://joinpipingknowledge.blogspot.... https://joinpipingknowledge.blogspot.... https://joinpipingknowledge.blogspot.... For any Query, please contact [email protected] https://joinpipingknowledge.blogspot.... https://joinpipingknowledge.blogspot.... https://joinpipingknowledge.blogspot.... A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic energy. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps a device that raises, transfers, delivers, or compresses fluids or that attenuates gases especially by suction or pressure or both. Pumps work by creating a vacuum in which ambient air pressure forces the liquid. All pumps work by creating areas of low pressure. In a centrifugal pump, centrifugal force accelerates the water to the outside of the impeller creating a low pressure at the eye or centre of the impeller. The Centripetal Pump (also called an impeller) is a cylindrical disk with multiple channels. These channels follow a curved path from the outer rim of the disk to a central drain pipe. The Centripetal Pump's outer rim dips into the rotating liquid. Useful information on NPSH What is NPSH? NPSH stands for Net Positive Suction Head and is a measure of the pressure experienced by a fluid on the suction side of a centrifugal pump. It is quoted as a Head (in feet or metres) rather than as an actual pressure (lb/in2 , psi or Pa) because ‘head’ is a fluid-independent property: a pump will lift different fluids to the same height irrespective of their densities. NPSH is defined as the total head of fluid at the centre line of the impeller less the fluid’s vapour pressure. The purpose of NPSH is to identify and avoid the operating conditions which lead to vaporisation of the fluid as it enters the pump – a condition known as flashing. In a centrifugal pump, the fluid’s pressure is at a minimum at the eye of the impeller. If the pressure here is below the vapour pressure of the fluid, bubbles are formed which pass on through the impeller vanes towards the discharge port. As the bubbles of vapour are transported into this higher pressure region, they can spontaneously collapse in a damaging process called cavitation . The repeated shock waves produced by this process can be a significant cause of wear and metal fatigue on impellers and pump cases. Cavitation also results in vibration and noise in the pump, placing greater strain on the drive shaft and other components, and lso in downstream pipework. This can lead to greater maintenance costs and a higher incidence of pump failures. Pumps shall generally be located in a row or in more than one row under / adjacent to the pipe racks. Pump handling non-flammable product can be placed directly under the pipe rack where as the pumps handling flammable product to be avoided directly under pipe racks carrying major product lines, air coolers or vessels. The Available NPSH (NPSHA): a measure of how close the fluid at a given point is to flashing, and so to cavitation. Technically it is the absolute pressure head minus the vapour pressure of the liquid. The Required NPSH (NPSHR): the head value at the suction side (e.g. the inlet of a pump) required to keep the fluid away from cavitating (provided by the manufacturer). Pls like Shear and Subscribe Piping Knowledge youtube channel Afzal Danish Welcome to my Youtube channel Piping Knowledge. I am Afzal an experienced piping engineer from the last 7 years. Through this platform, I will share my experiences and knowledge with you in an innovative way. So be with me for the next couple of years! For any Query [email protected] #Pump #centrifugal