Centrifugal pump having highest specific speed

Q.  Which of the following centrifugal pumps has higher specific speed than the others?
- Published on 16 Sep 15

a. Axial flow
b. Radial flow
c. Mixed flow
d. All have same specific speed

ANSWER: Axial flow

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    Discussion

  • Katey kano   -Posted on 05 May 17
    i am preparing for an interview for Mechanical Technician (Rotating Equipment) in a company that process and deliver natural Gas. i want to be helped with interview tips and answers.
  • Pankaj   -Posted on 14 Oct 15
    The centrifugal pumps classified on the basis of their specific speed are as follows:

    1. Radial flow pump

    2. Axial flow pump

    3. Mixed flow pump

    The specific speed (Ns) can be defined as the speed of geometrically symmetrical pump in all respect of actual pump which delivers 1 m3/s of discharge under a head of 1 m.

    Ns = (N √Q) / H3/4

    Where,

    N = speed, rpm

    Q = Discharge, m3/s

    H = Head, m

    Specific speeds of pumps

    - Radial flow pump: Specific speed = 10-80

    - Mixed flow pump: Specific speed = 80-160

    - Axial flow pump: Specific speed = 160-450

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