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https://www.examveda.com/centrifugal-pump-is-started-with-its-delivery-valve-57707/
Centrifugal pump is started with its delivery valve a) Kept fully closed b) Kept fully open c) Irrespective of any position d) Kept 50% open. Centrifugal pump is started with its delivery valve a) Kept fully closed b) Kept fully open c) Irrespective of any position d) Kept 50% open. Login . …
https://www.quora.com/What-happens-when-the-delivery-valve-of-a-centrifugal-pump-is-kept-closed-during-the-pump%E2%80%99s-operation
Feb 01, 2019 · While in the operation of centrifugal pump if discharge side valve is kept close and system is not incorporated with safety valve then there will be sudden increase in amount of fluid in the casing of pump and there will be rushing of fluid and there will be heavy movement of fluid particles which is supported by...
https://www.marinesite.info/2017/01/why-discharge-valve-closed-during-starting-of-centrifugal-pump.html
If you start the pump with discharge valve open, the discharge head will act on the pump ie, more resistance, so the motor has to give more starting torque to the pump which means more current is drawn by the motor. >If you start the pump discharge valve closed, it means no discharge head minimum resistance to the pump and minimum current drawn.Author: Bijoy Chandrasekhar
https://www.quora.com/Why-is-it-that-you-need-to-close-the-delivery-valve-of-a-centrifugal-pump-during-starting
May 01, 2016 · Originally Answered: why is it that you need to close the delivery valve of a centrifugal pump during starting? The motor for a centrifugal pump is normally not sized to run out to end of the curve. When the pump is started with no discharge pressure, the flow will go to maximum and power required will go to maximum and the motor will trip on over load.
https://answers.yahoo.com/question/index?qid=20080819053743AAgK1ER
Aug 19, 2008 · In the case of no pressure, you need to have the discharge valve closed otherwise you may overload the driver. If there is existing pressure in the discharge line, there is no concern with over loading either the pump or driver on start up since the pump develops no …
https://www.enggcyclopedia.com/2011/10/centrifugal-pump-start-up-procedure/
Circulate a small amount of fluid through the pump until the casing temperature is within 100°F (38°C) of the fluid temperature prior to pump start-up to avoid thermal shock to the liner and impeller and prevent damage of mechanical seal. Centrifugal pump start up procedure. Before pump start-up you must perform these tasks:-1. Open the suction valve. 2. Open any recirculation or cooling lines. 3.
https://www.pumpfundamentals.com/centrifugal-pump-tips.htm
If you need to control the flow, use a valve on the discharge side of the pump, never use a valve on the suction side for this purpose. This is an excellent treatment of the types of control systems for a centrifugal pump by Walter Driedger. And also this article by the same author on how to control positive displacement pumps. 9.
https://learnmechanical.com/centrifugal-pump/
This means that a centrifugal pump must be put underwater, or primed before it will move water. Priming and why it is necessary. Priming can be defined as the process in which the suction pipe, casing, delivery pipe up to the delivery valve, which is filled completely with liquid to be raised from an outside source before starting the motor.
http://www.sujalpumps.com/step-step-guide-centrifugal-pump-industrial-plant/
9. Starting The Centrifugal Pump: In order to start the centrifugal pump, the gate valve in the discharge line should be closed and opened gradually so that the motor approaches full speed. 10. Servicing: Periodical maintenance of the centrifugal pump is important to keep it problem free and in good condition. Operation: Open the suction valve of a centrifugal pump which will cause the liquid to flow into the …
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