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What is the reason for negative slip?

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What is the reason for negative slip?

Negative slip occurs when delivery pipe is short, suction pipe is long and pump is running at high speed.

Why priming is not done in reciprocating pump?

Why Priming is required? Pressure developed by the impeller of centrifugal pump, is proportional to the density of the fluid in the impeller. If the impeller is running in air, it will produce only a negligible pressure. This pressure will not suck water from its source through the suction pipe.

What is percentage slip in reciprocating pump?

The percentage slip in a reciprocating pump set is given by the \% of (where, Q₁ = actual discharge Q₂ = theoretical discharge) A. Q₁/Q₂ Q₂/Q₁ C. (

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What are the advantages and disadvantages of a reciprocating pump?

Advantages and Disadvantages of Reciprocating Pump

  • This pump is self-priming – Not require filling the cylinders by starting.
  • This pump can work in wide pressure range.
  • Priming is not necessary in pump.
  • Provide high pressure at outlet.
  • Provide elevated suction lift.
  • They are use for air also.

Why is reciprocating pump more efficient?

Reciprocating pumps run at a much lower speed than centrifugal pumps. By increasing speed, the packing and sealing life of the machine can be compromised. Balancing speed and plunger size can improve reliability and increase plunger and sealing life.

Why does cavitation occur in the centrifugal pumps?

Cavitation occurs when the liquid in a pump turns to a vapor at low pressure. It occurs because there is not enough pressure at the suction end of the pump, or insufficient Net Positive Suction Head available (NPSHa). As the liquid passes from the suction side of the impeller to the delivery side, the bubbles implode.

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Can slip be negative in reciprocating pump?

If actual discharge is more than the theoretical discharge, slip of the reciprocating pump will be negative and it could be concluded by considering the equation of slip of reciprocating pump. Negative slip will occur when suction pipe is long, delivery pipe is short and pump is running at high speed.