【Daily Question】Fundamentals of Chemical Engineering 070: Differences between Pumps (June 4)
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This post was last edited by *lihuagong on 2015-6-5 at 11:57. The Chemical Engineering Theory section is now launching a \"One Question per Day\" campaign to help everyone reinforce their basic knowledge in chemical engineering. Subsequent series will include those on \"Principles of Chemical Engineering\", \"Mass Transfer and Separation\", \"Thermodynamics in Chemical Engineering\", and \"Chemical Process Engineering\". We hope for your active support! Answers can be viewed directly by replying to the \"One Question per Day\" posts, and the topic will be closed after 1 day! ! Participation earns 2 wealth points, with an additional 3 wealth points for correct answers~~~ Fill-in-the-blank question: The differences in starting and adjusting centrifugal pumps and reciprocating pumps are as follows: Centrifugal pumps ___________________. ___________________. Reciprocating pumps _____________________. ____________________. Before starting, the pump must be filled with liquid; the outlet valve should be closed, and the flow rate should be adjusted using a control valve ； A reciprocating pump does not require priming before starting; a bypass valve is used to open and to regulate the flow rate.
Most centrifugal pumps require priming, and they must be run idle before the outlet is opened; this is not the case with reciprocating pumps
The difference in starting and adjusting centrifugal pumps and reciprocating pumps is as follows: when starting a centrifugal pump, the outlet valve must be closed; flow rate is regulated through this outlet valve. When starting a reciprocating pump, the outlet valve must be open; flow rate is adjusted by controlling the stroke.
Centrifugal pump: Start with the outlet closed; the flow rate can be adjusted by changing the opening degree of the outlet valve. Reciprocating pump: The outlet must be fully open at the time of startup, and the flow rate cannot be adjusted by changing the opening degree of the outlet valve
The difference in starting and adjusting centrifugal pumps and reciprocating pumps is as follows: For centrifugal pumps, the tank must be filled with liquid before starting; the outlet valve should be closed, and the flow rate is adjusted using a control valve. Reciprocating pumps, on the other hand, do not require filling with liquid before starting; a bypass valve is opened, and the flow rate is adjusted using a flow control valve
The difference in starting and adjusting centrifugal pumps versus reciprocating pumps is as follows: for centrifugal pumps, the tank must be filled with liquid before starting; the outlet valve should be closed, and the flow rate is adjusted using a control valve； Reciprocating pumps ___ do not require priming before starting; the bypass valve is used to open, and it is also utilized to regulate flow rate_.
The difference in starting and adjusting centrifugal pumps and reciprocating pumps is as follows: For centrifugal pumps, the __inlet is fully open__, while the __exit is closed__. For reciprocating pumps, the __inlet is closed__, and the __exit is fully open__. In centrifugal pumps, the exit is adjusted, whereas in reciprocating pumps, the inlet is adjusted
The last edit to this post was made by Siji on 2015-6-4 at 09:05. The difference in starting and adjusting centrifugal pumps and reciprocating pumps is as follows: before starting a centrifugal pump, the outlet valve of the liquid tank must be closed; whereas for reciprocating pumps, no such tank is needed, and a bypass is used instead
When starting a centrifugal pump, the outlet valve must be closed, whereas for a reciprocating pump, the outlet valve must be opened before starting； Centrifugal pumps generally regulate flow by using an outlet valve, while reciprocating pumps regulate flow by adjusting the stroke.
"Before starting, the pump should be primed; the outlet valve should be closed, and the flow rate should be adjusted using the control valve. There is no need to prime the pump before starting – instead, the bypass valve should be opened, and the flow rate adjusted through that valve“
Start by closing the outlet valve and regulate flow through the outlet valve; start by opening the outlet valve and regulate flow by adjusting the stroke