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1. A pump receives water from an open tank whose minimum water level is 1.5 m below the centerline of the pump. The water is at 16°C and the friction loss in the pipe is 1.2 m. For a water velocity of 1.02 m/s, what is the NPSHA?

1. A pump receives water from an open tank whose minimum water level is 1.5 m below the centerline of the pump. The water is at 16°C and the friction loss in the pipe is 1.2 m. For a water velocity of 1.02 m/s, what is the NPSHA?

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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1. A pump receives water from an open tank whose minimum water level is 1.5 m below the centerline of the pump. The water is at 16°C and the friction loss in the pipe is 1.2 m. For a water velocity of 1.02 m/s, what is the NPSHA? 2. Water is supplied to a pump from an overhead tank whose pressure is 34.5 Kpag. The water level in the tank is 5.2 m above the floor, and the water is saturated. The pump centerline is 76 cm above the floor. If the suction pipe carries 8 Ips and is a standard 101.6-mm pipe, calculate the NPSHA when the friction loss is 13.5 kPa. 3. Calculate the NPSHA for a pump that receives 150°C water at the rate of 79 Ips through a pipe whose ID is 25.4 cm. A suction gauge located 6 m below the pump centerline indicates a pressure of 530 kPag, and the barometer indicates a pressure of 716 mm Hg. 4. A pump receives water from a tank. If the pump needs 24 m of NPSHA, how high must the water level be above the pump centerline if the water is saturated at 1 724 kPag? The friction loss in the pipe averages 0.3 m for each 6 m of height and the flow is 23 Ips in a 15.24 cm ID pipe. 5. If a pipe requires a minimum of 2.75 m of NPSHA, how high can the centerline of the pump be located above the top of an open tank that supplies 27°C water to the pump? The barometer varies from 686 mm Hg to 732 mm Hg throughout the year. The tank is 1.82 m high, the pipe friction is 0.7 m, and the velocity is 1.22 m/s. 6. Determine the available suction head of a pump which is taking gas oil at a temperature of 204°C from a closed tank in which the pressure is 60 kPag. The specific gravity of the oil is 0.78 and its vapor pressure is 63.25 kPaa. The loss in the suction pipe is 0,61 m and the pump is located 3.65 m above the oil level in a plant at sea level. 7. A centrifugal pump receives 9.5 kg/s of water when the pump centerline is 2.75 m above the water level that has a pressure of 31 kPaa. Calculate the water horsepower, neglecting friction and velocity heads, if the discharge pressure gauge reads 38 m.
Transcribed Image Text:1. A pump receives water from an open tank whose minimum water level is 1.5 m below the centerline of the pump. The water is at 16°C and the friction loss in the pipe is 1.2 m. For a water velocity of 1.02 m/s, what is the NPSHA? 2. Water is supplied to a pump from an overhead tank whose pressure is 34.5 Kpag. The water level in the tank is 5.2 m above the floor, and the water is saturated. The pump centerline is 76 cm above the floor. If the suction pipe carries 8 Ips and is a standard 101.6-mm pipe, calculate the NPSHA when the friction loss is 13.5 kPa. 3. Calculate the NPSHA for a pump that receives 150°C water at the rate of 79 Ips through a pipe whose ID is 25.4 cm. A suction gauge located 6 m below the pump centerline indicates a pressure of 530 kPag, and the barometer indicates a pressure of 716 mm Hg. 4. A pump receives water from a tank. If the pump needs 24 m of NPSHA, how high must the water level be above the pump centerline if the water is saturated at 1 724 kPag? The friction loss in the pipe averages 0.3 m for each 6 m of height and the flow is 23 Ips in a 15.24 cm ID pipe. 5. If a pipe requires a minimum of 2.75 m of NPSHA, how high can the centerline of the pump be located above the top of an open tank that supplies 27°C water to the pump? The barometer varies from 686 mm Hg to 732 mm Hg throughout the year. The tank is 1.82 m high, the pipe friction is 0.7 m, and the velocity is 1.22 m/s. 6. Determine the available suction head of a pump which is taking gas oil at a temperature of 204°C from a closed tank in which the pressure is 60 kPag. The specific gravity of the oil is 0.78 and its vapor pressure is 63.25 kPaa. The loss in the suction pipe is 0,61 m and the pump is located 3.65 m above the oil level in a plant at sea level. 7. A centrifugal pump receives 9.5 kg/s of water when the pump centerline is 2.75 m above the water level that has a pressure of 31 kPaa. Calculate the water horsepower, neglecting friction and velocity heads, if the discharge pressure gauge reads 38 m.
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