Pressure Drop in a fire fighting network with loops

In summary, the conversation discussed verifying the External Static Pressure of a pump that feeds a pressurized fire fighting network with loops. The concept of pressure drop in a pressurized loop and the role of flow in determining pressure were also mentioned. The key factor in pressure variation was identified as the presence or absence of flow, with elevation changes also having an impact.
  • #1
tj00343
63
0
Hello Everyone,

Can someone please explain to me how I would go about verifying the External Static Pressure of a pump that feeds a pressurized fire fighting network with loops in it. An image of the network is attached. I'm not being able to grasp the concept of pressure drop in a pressurized loop and to imagine the hydraulics involved.

Thank you for your response

c4423b92-e09e-4eda-8ef9-e06aebb844cf
 

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  • #2
The key is flow. If there is no flow, the only variation in pressure will be the result of elevation changes.
If there is flow, then you basically have a resistor network. So the changes in pressure will be elevation plus the affects from flow.
 

1. What is pressure drop in a fire fighting network with loops?

Pressure drop is the decrease in pressure that occurs as water flows through a fire fighting network with loops. This can be caused by factors such as friction, changes in elevation, and fittings in the network.

2. How does pressure drop affect fire fighting network performance?

Pressure drop can significantly impact the performance of a fire fighting network. A high pressure drop can result in reduced flow rate and pressure at the end of the network, making it difficult to effectively fight fires. It can also cause delays in water reaching the desired location, potentially leading to further damage.

3. How is pressure drop calculated in a fire fighting network with loops?

Pressure drop can be calculated using the Hazen-Williams equation, which takes into account factors such as pipe diameter, length, and roughness, as well as the flow rate and water temperature. There are also computer programs available that can calculate pressure drop in a fire fighting network with loops.

4. What are some ways to reduce pressure drop in a fire fighting network with loops?

There are a few ways to reduce pressure drop in a fire fighting network with loops. One way is to increase the pipe diameter, which can reduce friction and therefore lower pressure drop. Another way is to minimize the number of fittings and changes in elevation in the network, as these can also contribute to pressure drop.

5. Are there any standards or regulations for pressure drop in fire fighting networks with loops?

Yes, there are standards and regulations that dictate the acceptable pressure drop in fire fighting networks with loops. For example, the National Fire Protection Association (NFPA) has guidelines for minimum water flow and pressure in fire protection systems, which can help determine the maximum allowable pressure drop in a network.

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