Measuring pressure across a centrifugal pump

In summary, the conversation is about measuring flow rate in a pipe with an in-line centrifugal pump. It is suggested to install pressure gauges before and after the pump to determine the flow rate using a look-up table. However, it is also mentioned that an orifice plate may be needed between the gauges for a more accurate reading. Alternatively, the flow rate can be calculated using the head flow curve of the pump and the differential pressure across it.
  • #1
djohnson83
1
0
This should be an easy one but here goes...

I am trying to easily measure flow rate in a pipe which has an in line centrifugal pump (Grundfos UPS 25-60) creating the head in the system. I have been told that installing a pressure gauge before and directly after the pump will give me system flow rate from a look-up table. Is this the case?

My recolection is that you need some kind of orifice plate in the flow and between the two gauges to get a useful reading.
 
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  • #2
If you have the head flow curve for the pump you can calculate the head from the DP across the pump and from that look up the flow.
 

1. What is the purpose of measuring pressure across a centrifugal pump?

Measuring pressure across a centrifugal pump helps determine the efficiency and performance of the pump. It also provides valuable information on the flow rate and head of the pump, which are important factors in determining the overall operation of the pump.

2. How is pressure measured across a centrifugal pump?

Pressure across a centrifugal pump is typically measured using a pressure gauge or sensor. This gauge or sensor is placed at different points along the pump's discharge line to measure the pressure at different stages of the pump's operation.

3. What is the difference between suction pressure and discharge pressure in a centrifugal pump?

Suction pressure refers to the pressure at the inlet of the pump, while discharge pressure is the pressure at the outlet of the pump. The difference between these two pressures is known as the pump's head, which is a measure of the energy required to move the fluid through the pump.

4. How does measuring pressure across a centrifugal pump help with troubleshooting?

By measuring pressure across a centrifugal pump, any abnormalities or deviations from the expected pressure can be identified. This can help pinpoint any issues with the pump, such as blockages, leaks, or impeller damage, and aid in troubleshooting and maintenance.

5. Does the type of fluid being pumped affect the pressure measurement in a centrifugal pump?

Yes, the type of fluid being pumped can affect the pressure measurement in a centrifugal pump. Different fluids have different viscosities and densities, which can impact the pressure and head required to move the fluid through the pump. It is important to consider the characteristics of the fluid when measuring pressure across a centrifugal pump.

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