How many rotors rotating devices does a reciprocating compressor have?
The spiral-lobe version is limited to 10,000 cfm flow and about 15 psi discharge pressure. The straight-lobe compressor is similar to the helical-lobe machine but is much less sophisticated. As the name implies, it has two untwisted or straight-lobe rotors that intermesh as they rotate.
How do Surging take place in centrifugal compressor stages suggest methods to minimize or prevent it what is its effect on the performance?
► Turbocharger Surge results in a “fluttering” as gas flow reverses momentarily through the compressor. ► Usually prevented by opening the “blow off valve”, bypassing exhaust gases around the turbocharger reducing speed and mass flow through the compressor.
What is the difference between a centrifugal compressor and reciprocating compressor?
Reciprocating compressors have a multistage operation. Centrifugal compressors are much better for low pressure and high discharge operations because they work at a constant rate. The pressure ratio is also much lower at around one and four, while reciprocating compressors are around five and eight.
Which pump is suitable for high head?
If the mechanical energy is converted into pressure energy by means of the centrifugal force acting on the fluid, the hydraulic machine is called a centrifugal pump….Explanation:
| Centrifugal pumps | Reciprocating pumps |
|---|---|
| It is used for large discharge through smaller heads | It is meant for a small discharge and high heads |
Which pump is preferred for small discharge at high pressure?
Solution:
| Centrifugal pumps | Reciprocating pumps |
|---|---|
| It is used for large discharge through smaller heads | It is meant for a small discharge and high heads |
| The cost of a centrifugal pump is less as compared to a reciprocating pump | The cost of a reciprocating pump is approximately four times the cost of a centrifugal pump |
What type of blade gives maximum efficiency?
A centrifugal pump gives maximum efficiency when its blades are. bent forward. bent backward. straight.
What is the major disadvantage of centrifugal pump?
The main disadvantage is that they use rotation instead of suction to move water, and therefore have almost no suction power. This means that a centrifugal pump must be put under water, or primed, before it will move water. Centrifugal pumps can also develop a phenomenon called “cavitation”.
What is the difference between a centrifugal pump and a positive displacement pump?
The obvious difference between the two is in the way they operate. As displayed above, centrifugal pumps impart velocity to the liquid, resulting in pressure at the outlet. Positive displacement pumps capture confined amounts of liquid and transfers it from the suction to the discharge port.