# Pump head and flow rate relation

• eaaaazizo
In summary, the conversation discusses the relationship between flow rate, head, and RPM in a pump. It is possible to increase the flow rate by decreasing the head, which can be done by changing the pump capacity with a constant RPM. This can be calculated using the pump affinity laws.
eaaaazizo
i need some help becoase i become confused
according to pump characteristic curve if the flow rate increased the head will decreased
the question is how i can increase the flow rate and what is the relation of RPM with head and flow rate

russ_watters said:
Have a look at the pump affinity laws: http://www.engineeringtoolbox.com/affinity-laws-d_408.html
thank u for ur answer but this link is speake about changing rpms it is available to change the pump head by change pump capacity with constant RPM and how ?

By combining the first and second equations, you get an equation that tells you that by lowering the pressure resistance in the system, you'll get an increase in flow.

## What is pump head and how is it related to flow rate?

Pump head is the measure of the energy required to move a fluid through a pump system. It is directly related to flow rate, as the higher the pump head, the higher the flow rate will be.

## What factors affect the pump head and flow rate relationship?

The pump head and flow rate relationship is affected by factors such as the type of pump, the speed of the pump, the fluid viscosity, and the size and length of the pipes.

## How can the pump head and flow rate be calculated?

The pump head can be calculated using the Bernoulli's equation, which takes into account the fluid's density, velocity, and elevation. The flow rate can be calculated using the equation Q = VA, where Q is the flow rate, V is the velocity of the fluid, and A is the cross-sectional area of the pipe.

## What is the optimal pump head and flow rate for a given system?

The optimal pump head and flow rate for a given system will depend on the specific needs and requirements of the system. Factors such as the desired flow rate, the pressure requirements, and the type of fluid being pumped should be considered when determining the optimal values.

## What are the consequences of a mismatch between the pump head and flow rate?

If the pump head and flow rate are not properly matched, it can result in inefficiency and damage to the pump system. If the pump head is too high, it can lead to excessive energy consumption and wear on the pump. If the flow rate is too high, it can cause cavitation, which can damage the pump and reduce its efficiency.

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