My Exam Notes
  • Home
  • CURRENT AFFAIRS
  • GENERAL AWARENESS
    • Child Category 1
  • BIHAR PSC
  • Home
  • CURRENT AFFAIRS
  • GENERAL AWARENESS
  • BIHAR GK
  • RAJASTHAN GK
  • MECHANICAL NOTES

Tuesday, October 13, 2015

CASING OF CENTRIFUGAL PUMP, ITS TYPES AND PRIMING OF TURBINES

 My Exam Notes     1:23 AM     FLUID MECHANICS     2 comments   

MECHANICAL TIPS AND STUDY MATERIAL

CASING OF CENTRIFUGAL PUMP



As we know casing surrounds the impeller and guides the water and also raises the static head. These are designed in such a way that the kinetic energy of water at the outlet of impeller is converted into pressure energy. Mainly three types of casing are used for centrifugal pumps.

Ø  Volute casing
Ø  Vortex casing
Ø  Diffuser casing

We will discuss all the three casing in detail.

1)      VOLUTE CASING – Spiral type casing


In such casing the area of flow increases gradually from inlet (throat) to output (delivery pipe). As the area of flow increases gradually the velocity decreases and pressure energy increases.

The only demerit of such casing is formation of eddies where lot of energy is wasted. But on the whole the efficiency of pump can be increased slightly.

2)      VORTEX CASING – Circular casing

This is simple arrangement with circular chamber between the impeller and casing. The prime advantage of such construction is that there are negligible eddy losses. Hence energy loss is negligible and efficiency increases. So we can say that vortex casing is better than volute casing.

3)      DIFFUSER CASING


These types of casing consist of additional guide blades in-between casing and impeller. These guide blades are mounted on a ring type structure called diffuser. When the water from impeller enters to the guide blade and its velocity is further reduced as the water flows through increased area of flow. Due to reduced velocity of water the pressure energy is increased. It is to be noted here that the efficiency of the diffuser cased pump are greater than the volute and vortex casing pump.

PRIMING – ITS IMPORTANCE

A pump is primed properly before one starts it for operation. It is process of removing air from the suction pipe, impeller and the casing.
Now let’s see how priming is done. To remove the air present, the suction pipe, casing and the delivery pipe is completely filled with water. This removes the air out of the pump.

At this point you must ask a question that – Since head generated by the pump is independent of fluid, WHY CAN’T WE USE AIR AS WORKING FLUID AND WHY PRIMING IS NECESSARY?

The answer is very simple. If we use air as working fluid the head generated is in terms of meters of air. When we use water as working fluid the head generated is in terms of meters of water. As we know that density of air is very less as compared to water, the head produced with air as working fluid will be far negligible than water  as working fluid. Hence we remove air from the pump part as it may not be sufficient to suck the water from the sump and will reduce the efficiency of the pump. To remove such difficulty priming is done
  • Share This:  
  •  Facebook
  •  Twitter
  •  Google+
  •  Stumble
  •  Digg
Email ThisBlogThis!Share to TwitterShare to Facebook
Newer Post Older Post Home

2 comments:

  1. BobJanuary 21, 2019 at 8:12 AM

    Very Informative,Thanks for sharing
    Centrifugal Pumps

    ReplyDelete
    Replies
      Reply
  2. Joseph MikelAugust 31, 2019 at 12:58 PM

    I enjoyed reading your post. I will share it with my other friends as the information is really very useful. Keep sharing your excellent work. air motor for sale

    ReplyDelete
    Replies
      Reply
Add comment
Load more...

MY TRAVEL VLOG-Being Tourist

Popular Posts

  • Environment Current Affairs 2019 PDF download | Important Questions |
    Watch video on EXAM FOCUS YOUTUBE CHANNEL. Which city of china in only one with all electric taxis? Taiyuan Shenzhen Jingia...
  • TURBOMACHINES
                    TURBOMACHINE DEFINATIONAND  EXPLANATION A turbo-machine is a device in which energy transfer takes place between ro...
  • ENERGY LOSS IN PIPES, Darcy- weicbach formula, Chezy's formula, minor losses in pipe
    MECHANICAL TIPS AND STUDY MATERIAL When ever there is flow of fluid in pipes there will be resistance which add to energy loss. For our stud...
  • #MOST IMPORTANT AUGUST CURRENT AFFAIRS 2018 #PDF link #NOTES #अगस्त करें...
    PDF IS BELOW NOTES - Go Down Notes of August Current Affairs- Navlekha a new platform launched by Google .Google has announced pr...
  • METAL INERT GAS WELDING AND TUNGSTEN INERT GAS WELDING
            TUNGSTEN INERT GAS WELDING (TIG) CHARACTERISTICS IN  BRIEF It is known as GAS TUNGSTEN ARC WELDING (GTAW). Also called Argon arc wel...
  • MAY (1-15th) CURRENT AFFAIRS 2019 | MCQ's | EXPLAINED | FREE PDF |
    PDF WILL BE UPLOADED ON 24/05/2019 The newly elected prime minister of Israel is? Benjamin Netanyahu What is the theme of Internati...
  • #SPACE CURRENT AFFAIRS last 6 months #स्पेस/अंतरिक्ष विज्ञान करेंट अफेयर...
    Indian national committee for space research was established in the year 1962 Indian Space Research Organisation was founded in year 19...
  • BANKING CURRENT AFFAIRS | MD, CEO, CHAIRMAN Of BANKS (UPDATED 2019)| MCQ's | static gk
    This POST is on Banking Awareness 2019 with all important National Banks and its MD/CEO/CHAIRMAN with important points to remember for all...
  • SINGLE PLATE CLUTCH,CONE CLUTCH AND CENTRIFUGAL CLUTCH
                   SINGLE PLATE CLUTCH DESCRIPTION  In the general arrangement it consists of a disc which has frictional material on both its s...
  • CASING OF CENTRIFUGAL PUMP, ITS TYPES AND PRIMING OF TURBINES
    MECHANICAL TIPS AND STUDY MATERIAL CASING OF CENTRIFUGAL PUMP As we know casing surrounds the impeller and guides the water and also raises ...

Categories

AUTOMOBILE BASICS BHIHAR PSC BIHAR PSC biology quiz CURRENT AFFAIRS economics FASTEST MACHINES FLUID MECHANICS GEARS GENERAL AWARENESS HEAT AND MASS TRANSFER I C ENGINE JET ENGINES JOB OPENING IN USA MACHINING PROCESSES MANUFACTURING PROCESS MATERIAL SCIENCE mechanical engineering MECHANICAL JOB VACANCY IN INDIA MECHANICAL VIBRATION MISSILES POLITY QUIZ POWER PLANT ENGINEERING RAJASTHAN GK sports STRENGTH OF MATERIAL THERMODYNAMICS TOP COLLEGES TOP SPEED TURBINES WELDING

Pages

  • QUIZ

Featured post

SCIENCE & TECHNOLOGY CURRENT AFFAIRS 2018 (JANUARY - JUNE)विज्ञान प्रौद्...

CBSE (Central Board of indirect taxes) launched which app to check person collecting GST? GST verify National science day was celebrate...

ad code

Copyright © My Exam Notes | Powered by Blogger
Design by Hardeep Asrani | Blogger Theme by NewBloggerThemes.com | Distributed By blogger Templates