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The diameter of a centrifugal pump, which is discharging 0.035 m³/s of water against a total head of 25 m is 0.5 m. The pump is running at 1200 r.p.m. Find the head, discharge and ratio of powers of a geometrically similar pump of diameter 0.3 m when it is running at 2000 r.p.m.

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Pump Affinity Law Calculation Problem Statement The diameter of a centrifugal pump, which is discharging 0.035 m³/s of water against […]

The diameter of a centrifugal pump, which is discharging 0.035 m³/s of water against a total head of 25 m is 0.5 m. The pump is running at 1200 r.p.m. Find the head, discharge and ratio of powers of a geometrically similar pump of diameter 0.3 m when it is running at 2000 r.p.m. Read More »

Find the number of pumps required to take water from a deep well under a total head of 156 m. Also the pumps are identical and are running at 1000 r.p.m. The specific speed of each pump is given as 20 while the rated capacity of each pump is 150 litre/s.

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Pump Staging Calculation Problem Statement Find the number of pumps required to take water from a deep well under a

Find the number of pumps required to take water from a deep well under a total head of 156 m. Also the pumps are identical and are running at 1000 r.p.m. The specific speed of each pump is given as 20 while the rated capacity of each pump is 150 litre/s. Read More »

A three-stage centrifugal pump has impeller 40 cm in diameter and 2.5 cm wide at outlet. The vanes are curved back at the outlet at 30° and reduce the circumferential area by 15%. The manometric efficiency is 85% and overall efficiency is 75%. Determine the head generated by the pump when running at 1200 r.p.m. and discharge is 0.06 m³/s. Find the shaft power also.

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Three-Stage Centrifugal Pump Analysis Problem Statement A three-stage centrifugal pump has impeller 40 cm in diameter and 2.5 cm wide

A three-stage centrifugal pump has impeller 40 cm in diameter and 2.5 cm wide at outlet. The vanes are curved back at the outlet at 30° and reduce the circumferential area by 15%. The manometric efficiency is 85% and overall efficiency is 75%. Determine the head generated by the pump when running at 1200 r.p.m. and discharge is 0.06 m³/s. Find the shaft power also. Read More »

The diameter of an impeller of a centrifugal pump at inlet and outlet are 300 mm and 600 mm respectively. The velocity of flow at outlet is 2.5 m/s and vanes are set back at an angle of 45° at outlet. Determine the minimum starting speed of the pump if the manometric efficiency is 75%.

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Pump Minimum Starting Speed Calculation (with Efficiency) Problem Statement The diameter of an impeller of a centrifugal pump at inlet

The diameter of an impeller of a centrifugal pump at inlet and outlet are 300 mm and 600 mm respectively. The velocity of flow at outlet is 2.5 m/s and vanes are set back at an angle of 45° at outlet. Determine the minimum starting speed of the pump if the manometric efficiency is 75%. Read More »

The diameters of an impeller of a centrifugal pump at inlet and outlet are 20 cm and 40 cm respectively. Determine the minimum speed for starting the pump if it works against a head of 25 m.

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Pump Minimum Starting Speed Calculation Problem Statement The diameters of an impeller of a centrifugal pump at inlet and outlet

The diameters of an impeller of a centrifugal pump at inlet and outlet are 20 cm and 40 cm respectively. Determine the minimum speed for starting the pump if it works against a head of 25 m. Read More »

Find the rise in pressure in the impeller of a centrifugal pump through which water is flowing at the rate of 15 litres/s. The internal and external diameters of the impeller are 20 cm and 40 cm respectively. The widths of impeller at inlet and outlet are 1.6 cm and 0.8 cm. The pump is running at 1200 r.p.m. The water enters the impeller radially at inlet and impeller vane angle at outlet is 30°. Neglect losses through the impeller.

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Impeller Pressure Rise Calculation Problem Statement Find the rise in pressure in the impeller of a centrifugal pump through which

Find the rise in pressure in the impeller of a centrifugal pump through which water is flowing at the rate of 15 litres/s. The internal and external diameters of the impeller are 20 cm and 40 cm respectively. The widths of impeller at inlet and outlet are 1.6 cm and 0.8 cm. The pump is running at 1200 r.p.m. The water enters the impeller radially at inlet and impeller vane angle at outlet is 30°. Neglect losses through the impeller. Read More »

Find the power required to drive a centrifugal pump which delivers 0.02 m³/s of water to a height of 30 m through a 10 cm diameter pipe and 90 m long. The overall efficiency of the pump is 70% and f = 0.009 in the formula of head loss.

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Pump Power Requirement Calculation Problem Statement Find the power required to drive a centrifugal pump which delivers 0.02 m³/s of

Find the power required to drive a centrifugal pump which delivers 0.02 m³/s of water to a height of 30 m through a 10 cm diameter pipe and 90 m long. The overall efficiency of the pump is 70% and f = 0.009 in the formula of head loss. Read More »

A centrifugal pump is running at 1000 r.p.m. The outlet vane angle of the impeller is 30° and velocity of flow at outlet is 3 m/s. The pump is working against a total head of 30 m and the discharge through the pump is 0.3 m³/s. If the manometric efficiency of the pump is 75%, determine: (i) the diameter of the impeller, and (ii) the width of the impeller at outlet.

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Centrifugal Pump Design Calculation Problem Statement A centrifugal pump is running at 1000 r.p.m. The outlet vane angle of the

A centrifugal pump is running at 1000 r.p.m. The outlet vane angle of the impeller is 30° and velocity of flow at outlet is 3 m/s. The pump is working against a total head of 30 m and the discharge through the pump is 0.3 m³/s. If the manometric efficiency of the pump is 75%, determine: (i) the diameter of the impeller, and (ii) the width of the impeller at outlet. Read More »

A centrifugal pump having outer diameter equal to two times the inner diameter and running at 1200 r.p.m. works against a total head of 75 m. The velocity of flow through the impeller is constant and equal to 3 m/s. The vanes are set back at an angle of 30° at outlet. If the outer diameter of the impeller is 600 mm and width at outlet is 50 mm, determine : (a) vane angle at inlet, (b) work done per second by impeller, (c) manometric efficiency.

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Centrifugal Pump Performance Analysis Problem Statement A centrifugal pump having outer diameter equal to two times the inner diameter and

A centrifugal pump having outer diameter equal to two times the inner diameter and running at 1200 r.p.m. works against a total head of 75 m. The velocity of flow through the impeller is constant and equal to 3 m/s. The vanes are set back at an angle of 30° at outlet. If the outer diameter of the impeller is 600 mm and width at outlet is 50 mm, determine : (a) vane angle at inlet, (b) work done per second by impeller, (c) manometric efficiency. Read More »

The internal and external diameters of the impeller of a centrifugal pump are 300 mm and 600 mm respectively. The pump is running at 1000 r.p.m. The vane angles at inlet and outlet are 20° and 30° respectively. The water enters the impeller radially and velocity of flow is constant. Determine the work done by the impeller per unit weight of water.

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Centrifugal Pump Work Done Calculation Problem Statement The internal and external diameters of the impeller of a centrifugal pump are

The internal and external diameters of the impeller of a centrifugal pump are 300 mm and 600 mm respectively. The pump is running at 1000 r.p.m. The vane angles at inlet and outlet are 20° and 30° respectively. The water enters the impeller radially and velocity of flow is constant. Determine the work done by the impeller per unit weight of water. Read More »

Calculate the pressure at a height of 8000 m above sea-level if the atmospheric pressure is 101.3 kN/m² and temperature is 15°C at the sea-level assuming (i) air is incompressible, (ii) pressure variation follows adiabatic law, and (iii) pressure variation follows isothermal law. Take the density of air at the sea-level as equal to 1.285 kg/m³. Neglect variation of g with altitude.

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Atmospheric Pressure at Altitude (3 Models) Problem Statement Calculate the pressure at a height of 8000 m above sea-level if

Calculate the pressure at a height of 8000 m above sea-level if the atmospheric pressure is 101.3 kN/m² and temperature is 15°C at the sea-level assuming (i) air is incompressible, (ii) pressure variation follows adiabatic law, and (iii) pressure variation follows isothermal law. Take the density of air at the sea-level as equal to 1.285 kg/m³. Neglect variation of g with altitude. Read More »

If the atmospheric pressure at sea-level is 10.143 N/cm², determine the pressure at a height of 2000 m assuming that the pressure variation follows: (i) Hydrostatic law, and (ii) Isothermal law. The density of air is given as 1.208 kg/m³.

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Atmospheric Pressure Calculation at Altitude Problem Statement If the atmospheric pressure at sea-level is 10.143 N/cm², determine the pressure at

If the atmospheric pressure at sea-level is 10.143 N/cm², determine the pressure at a height of 2000 m assuming that the pressure variation follows: (i) Hydrostatic law, and (ii) Isothermal law. The density of air is given as 1.208 kg/m³. Read More »

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