Numerical (Water)

A single-acting reciprocating pump has a cylinder of a diameter 150 mm and of stroke length 300 mm. The centre of the pump is 4 m above the water surface in the sump. The atmospheric pressure head is 10.3 m of water and pump is running at 40 r.p.m. If the length and diameter of the suction pipe are 5 m and 10 cm respectively, determine the pressure head due to acceleration in the cylinder : (i) At the beginning of the suction stroke, and (ii) In the middle of suction stroke.

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Reciprocating Pump Acceleration Head Calculation Problem Statement A single-acting reciprocating pump has a cylinder of a diameter 150 mm and […]

A single-acting reciprocating pump has a cylinder of a diameter 150 mm and of stroke length 300 mm. The centre of the pump is 4 m above the water surface in the sump. The atmospheric pressure head is 10.3 m of water and pump is running at 40 r.p.m. If the length and diameter of the suction pipe are 5 m and 10 cm respectively, determine the pressure head due to acceleration in the cylinder : (i) At the beginning of the suction stroke, and (ii) In the middle of suction stroke. Read More »

A double-acting reciprocating pump, running at 50 r.p.m. is discharging 900 litres of water per minute. The pump has stroke of 400 mm. The diameter of piston is 250 mm. The delivery and suction heads are 25 m and 4 m respectively. Find the slip of the pump and power required to drive the pump.

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Double-Acting Reciprocating Pump Analysis Problem Statement A double-acting reciprocating pump, running at 50 r.p.m. is discharging 900 litres of water

A double-acting reciprocating pump, running at 50 r.p.m. is discharging 900 litres of water per minute. The pump has stroke of 400 mm. The diameter of piston is 250 mm. The delivery and suction heads are 25 m and 4 m respectively. Find the slip of the pump and power required to drive the pump. Read More »

A single-acting reciprocating pump running at 30 r.p.m., delivers 0.012 m³/s of water. The diameter of the piston is 25 cm and stroke length is 50 cm. Determine : (i) The theoretical discharge of the pump, (ii) Co-efficient of discharge, and (iii) Slip and percentage slip of the pump.

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Reciprocating Pump Performance Analysis Problem Statement A single-acting reciprocating pump running at 30 r.p.m., delivers 0.012 m³/s of water. The

A single-acting reciprocating pump running at 30 r.p.m., delivers 0.012 m³/s of water. The diameter of the piston is 25 cm and stroke length is 50 cm. Determine : (i) The theoretical discharge of the pump, (ii) Co-efficient of discharge, and (iii) Slip and percentage slip of the pump. Read More »

A centrifugal pump is to discharge 0.12 m³/s at a speed of 1400 r.p.m. against a head of 30 m. The diameter and width of the impeller at outlet are 25 cm and 5 cm respectively. If the manometric efficiency is 75%, determine the vane angle at outlet.

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Pump Outlet Vane Angle Calculation Problem Statement A centrifugal pump is to discharge 0.12 m³/s at a speed of 1400

A centrifugal pump is to discharge 0.12 m³/s at a speed of 1400 r.p.m. against a head of 30 m. The diameter and width of the impeller at outlet are 25 cm and 5 cm respectively. If the manometric efficiency is 75%, determine the vane angle at outlet. Read More »

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 »

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