What happened when Delivery valve closed and Suction valve open in centrifugal pump.(in running conditions)
- 3 Answers
- 7698 Views
- KFCL, I also Faced
- E-Mail Answers
Answer Posted / phani
After some period, churning effect will takes place, which means dry run. This is due to continuous water circulation within the casing. After some period, due to friction between pump casing and flowing water, heat will be generated, slowly water getting heated up and further evaporation takes place, then pump will be under dry run condition.
Internal circulation means, discharged water can't escape from casing, so only the way to escape is passes through wear ring clearance and came to suction, again from suction to discharge water will flow.
Due to this dry run, shaft and casing will be over heated and thermal expansion takes place, shaft may brake at time.
If bluish or burning marks are found on shaft/impeller, it means that "pump runs on shut off head or Churning effect", it is confirm.
| Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
Hi i am having 5 yrs of exp in Proe wildfire,Anybody have the jobs related to Aerospace
what is the difference between En19 and En24
Interview question paper
What will be the cause of high temperature in one cylinder of D/E?
Proximity analysis of coal provides data for a first, general assessment of a coal’s quality and type. What elements it reports ?
What is galvanic corrosion?
Sir Plz Send me the questions of interview of Mechanical stream for ONGC
Where can you find thermometers in diesel engines?
hi please send the exam modle paper for mechanical engineering. Iam attending for vizag steel plant MT
What will cause if you run your engine in critical RPM continuously?
engine so2 farmula
What is stellite ?
How many years did it take for you to complete school?
how can you describe yourself
how many types of jacks
