Two identical pumps having the same discharge (Q) and working against the same head (H). If they are connected in parallel, which of the following is correct?

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  1. Combined discharge = 2Q, Combined head = H
  2. Combined discharge = Q, Combined head  = 2H
  3. Combined discharge = 4Q, Combined head = H/2
  4. Combined discharge = 2Q, Combined head = 2H

Answer (Detailed Solution Below)

Option 1 : Combined discharge = 2Q, Combined head = H
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Detailed Solution

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Explanation:

According to Gorman-Rupp:

Pumps operating in parallel 

  • In parallel, two pumps can simultaneously discharge a greater amount of water than the individual one.
  • Hence boost the discharge, if two pumps are connected in parallel.
  • hnet = h1 = h2 = h3 = hn
  • Qnet = Q1 + Q2 + Q3 +..... Qn

Pumps operating in series

  • When two pumps are connected in series at the same flow rate the series pump yield high heads as compared to the individual heads produce by each pump.
  • hnet = h1 + h2 + h3 +......hn
  • Qnet = Q1 = Q2 = Q3 = Qn

 

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