الفهرس 
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Abstract
Centrifugal pumps are the most widely used type of rotating mechanical equipment in the world.
Centrifugal pumps offer• important advantages over other types of pumps; since they operate at higher speeds also they are smaller and lighter. Centrifugal pumps are used to increase pressure energy of the liquid for the purpose of transportation through piping and other devices for use in an industrial process.
When resizing a pump for a new application, it is important to account the effect of the new pumped fluid properties (Density and viscosity) also the effect altering the pump’s speed or impeller’s diameter. The head-capacity, efficiency, power, NPSHA and NPSHR curves presented in the vendor’s catalogs are prepared using water as a pumped fluid. It is necessary for design engineers to be familiar with the theory and application of centrifugal pumps.
A case-study was chosen, two centrifugal pumps at RASHPETCO were used to pump•
hqutd gas condensate (hydrocarbon) to WEPCO after the contract WIth WEPC~O~w-as----cance1ed and the pumps were out of service. Due to safety issues, these pumps are
modified to pump process disposal water out off the site through a loading station that
was build away from the gas processing area. The impeller diameter and motor speed
of the mentioned pumps and the discharge pipeline were modified. This case-study is concerned with studying the effect of changes of fluid density, fluid viscosity,
impeller diameter and motor speed on the pump performance and their effect on
forcing the pump to operate off the design range.
Studying the cavitation types specially the cavitation due to operating at low flow rates which cause the internal recirculation at the suction and discharge and ways to overcome this type of cavitation like the bulk head ring and suction stabilizer pipe.
Pump similarity rules are used to calculate the change in head-capacity, efficiency, power, NPShA and NPSHR by using the Matlab. A new pump was selected to perform the same job but more efficient and economical way.