Explain why it is important to consider NPSH when designing and operating a pumping system.

The net positive suction (NPSH) is an important factor because the value of the available net positive suction head should not drop below the value of the required net positive suction head. If that happens, the absolute pressure of the liquid at the inlet of the pump will be lower than the vapor pressure of the liquid at the given temperature. In that case, cavitation will occur.

Explain why it is important to consider NPSH when designing

engineering

Explain what happens to the vapor pressure of water as the temperature increases.

engineering

Distinguish between NPSH available and NPSH required.

engineering

Describe net positive suction head (NPSH).

engineering

It is expected to operate a pump at $1750\ \mathrm{rpm}$ by driving it with a four-pole electric motor. For each of the following conditions, compute the specific speed using the earlier-mentioned equation. Then, recommend whether to use an axial pump, a mixed-flow pump, a radial-flow pump, or none of these, based on the discussion related to the given figure.

a. $500 \mathrm{gal} / \mathrm{min}$ of water at $80 \mathrm{ft}$ of total head b. $500 \mathrm{gal} / \mathrm{min}$ of water at $800 \mathrm{ft}$ of head c. $3500 \mathrm{gal} / \mathrm{min}$ of water at $80 \mathrm{ft}$ of head d. $80 \mathrm{gal} / \mathrm{min}$ of water at $8000 \mathrm{ft}$ of head e. $80 \mathrm{gal} / \mathrm{min}$ of water at $800 \mathrm{ft}$ of head f. $8000 \mathrm{gal} / \mathrm{min}$ of water at $200 \mathrm{ft}$ of head g. $8000 \mathrm{gal} / \mathrm{min}$ of water at $60 \mathrm{ft}$ of head h. $8000 \mathrm{gal} / \mathrm{min}$ of water at $12 \mathrm{ft}$ of head

Explain why it is important to consider NPSH when designing and operating a pumping system.

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