3. 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. [Ans. (i) 43.1 cm, (ii) 7.4 cm]
Added by Juan B.
Close
Step 1
75), we can calculate the manometric head (Hm) using the formula: \[ H_m = \frac{Total\ Head}{Manometric\ Efficiency} \] \[ H_m = \frac{30}{0.75} = 40\ m \] Show more…
Show all steps
Your feedback will help us improve your experience
Lien Le and 89 other Physics 101 Mechanics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
The outer diameter of a centrifugal pump is twice its inner diameter. The pump runs at a speed of 1200 rpm and works against a head of 32 m. The velocity of flow through the impeller is constant and equals to 3 m/s. The vanes are set back at an angle of 30 degrees at the outlet. If the outer diameter of the impeller is 600 mm and the width at the outlet is 50 mm, determine: 3.1 Make a neat sketch of the velocity triangle for this pump. 3.2 Tangential velocity at the inlet. 3.3 Tangential velocity at the outlet. 3.4 The velocity flow at the outlet. 3.5 The vane angle at the inlet. 3.6 The flow rate. 3.7 Work done per second by the impeller.
Penny R.
A centrifugal pump is running at 1000 r.p.m. and working against a head of 20 m. The rate of flow through the pump is 0.2 m3/s. The outlet vane angle of impeller is 45 and velocity of flow at outlet is 2.5 m/s. If the manometric efficiency of the pump is 80 percent, calculate the diameter and width of impeller at outlet. [Ans. (i) 324 mm ; (ii) 78.6 mm]
Madhur L.
A centrifugal pump has the following characteristics: outer diameter of impeller 800 mm, width of impeller vanes at outlet 100 mm, angle of impeller vanes at outlet 40°. The impeller runs at 550 rpm and delivers 0.98 m^3/s of water under an effective head of 35 m. A 500 kW motor is used to drive the pump. Determine the manometric, mechanical, and overall efficiencies of the pump. Assume water enters the impeller vanes radially at the inlet. [ηmano = 81%, ηm = 83%, ηo = 67%].
Recommended Textbooks
University Physics with Modern Physics
Physics: Principles with Applications
Fundamentals of Physics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD