Chemical Engineering - Fluid Mechanics - Discussion
Discussion Forum : Fluid Mechanics - Section 1 (Q.No. 19)
19.
If the discharge of a centrifugal pump is throttled, then its suction lift
Discussion:
16 comments Page 1 of 2.
Hemant kadian said:
1 decade ago
Please explain the effect of discharge head on the suction lift?
Dollar hunter said:
1 decade ago
If the discharge is throttled, the flow decreasing causes the decreasing NPSH require.
So the suction lift should be decreased right ?
So the suction lift should be decreased right ?
Sonam M Arora said:
1 decade ago
How?
Nadeem said:
10 years ago
It's is because manometric head required for pump decreases when discharge end is throttle.
SAURABH RAI said:
9 years ago
I think that no any effect of throttling of discharge on the suction lift. Because according to suction life formula no any term exist related to this. But yes output head i.e. manometric head will increase.
Prashant said:
9 years ago
P = head * density * specific gravity.
If discharge throttle, pressure will increase, so the head will increase.
So total head suction + discharge will increase.
If discharge throttle, pressure will increase, so the head will increase.
So total head suction + discharge will increase.
(1)
Rupesh Tiwari said:
9 years ago
If the discharge of a centrifugal pump is throttled, then its suction lift will increase (by considering liquid level in suction pond/sump is same as before). When I say suction lift, I am directly pointing out the Static Suction Pressure of the pump.
Surendra said:
7 years ago
I think remains unchanged because if we throttle the pump delivery flow pump load will reduce but speed of the impeller and flow coming to impeller eye will be the same. Again if we increase the pump delivery valve to get more flow without doing anything flow will come that means suction static pressure will be the same.
Ashim said:
7 years ago
Yes, I think it remain unchanged.
Abhi said:
6 years ago
Suction lift means I really not get but if we check the hydraulic calculation it remains unchanged.
(1)
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers