Help Specify the number of sprinkler needed to suppress fire at last floor or blgd?

[Slayinasian]

Specify the number of sprinkler needed to suppress fire at last floor or blgd with 12 rooms of 3×6m and a hallway of 1.5 meter wide at the center of the equally divided rooms

 

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To calculate the number of sprinklers needed to suppress fire at the last floor of a building with 12 rooms of 3x6m and a hallway of 1.5 meters wide at the center of the equally divided rooms, we need to consider a few factors.

First, we need to determine the area of the rooms and the hallway. Each room has a floor area of 3 x 6 = 18 square meters. There are 12 rooms, so the total area of the rooms is 12 x 18 = 216 square meters. The hallway has a floor area of 1.5 x (6 + 6 + 1.5) = 19.5 square meters.

Next, we need to determine the occupancy classification of the building. This will help us determine the required density of water for the sprinklers. For a residential occupancy, the required density is typically 7.5 mm/min, while for a business occupancy, it can range from 10.2 to 12.2 mm/min.

Assuming the building is a residential occupancy, we can calculate the water flow required for the sprinklers. The formula for water flow is:

Q = A x D x 0.0001

where Q is the water flow in liters per minute, A is the area in square meters, and D is the required density in mm/min.

For a residential occupancy with a required density of 7.5 mm/min, the water flow required is:

Q = (216 + 19.5) x 7.5 x 0.0001 = 0.1706 liters/min

Finally, we need to determine the coverage area of each sprinkler. This will depend on the type of sprinkler being used, but a common coverage area is 12 square meters.

To determine the number of sprinklers needed, we can divide the total area of the rooms and hallway by the coverage area of each sprinkler:

Number of sprinklers = (216 + 19.5) / 12 = 19.125

Since we cannot have fractional sprinklers, we need to round up to the nearest whole number. Therefore, we would need 20 sprinklers to suppress fire at the last floor of this building.

 

[Slayinasian]

To calculate the number of sprinklers needed to suppress fire at the last floor of a building with 12 rooms of 3x6m and a hallway of 1.5 meters wide at the center of the equally divided rooms, we need to consider a few factors.

First, we need to determine the area of the rooms and the hallway. Each room has a floor area of 3 x 6 = 18 square meters. There are 12 rooms, so the total area of the rooms is 12 x 18 = 216 square meters. The hallway has a floor area of 1.5 x (6 + 6 + 1.5) = 19.5 square meters.

Next, we need to determine the occupancy classification of the building. This will help us determine the required density of water for the sprinklers. For a residential occupancy, the required density is typically 7.5 mm/min, while for a business occupancy, it can range from 10.2 to 12.2 mm/min.

Assuming the building is a residential occupancy, we can calculate the water flow required for the sprinklers. The formula for water flow is:

Q = A x D x 0.0001

where Q is the water flow in liters per minute, A is the area in square meters, and D is the required density in mm/min.

For a residential occupancy with a required density of 7.5 mm/min, the water flow required is:

Q = (216 + 19.5) x 7.5 x 0.0001 = 0.1706 liters/min

Finally, we need to determine the coverage area of each sprinkler. This will depend on the type of sprinkler being used, but a common coverage area is 12 square meters.

To determine the number of sprinklers needed, we can divide the total area of the rooms and hallway by the coverage area of each sprinkler:

Number of sprinklers = (216 + 19.5) / 12 = 19.125

Since we cannot have fractional sprinklers, we need to round up to the nearest whole number. Therefore, we would need 20 sprinklers to suppress fire at the last floor of this building.

Can you also specify the pipe size needed to use in the branches the size of cross main according to the number of sprinkler?

 

[🤖]

Can you also specify the pipe size needed to use in the branches the size of cross main according to the number of sprinkler?

Yes, to determine the pipe size needed for the branches and cross main to supply the required number of sprinklers, we need to consider the flow rate and pressure requirements of the system.

Based on the water flow rate calculated earlier of 0.1706 liters/min, we can use a conservative value of 3 liters/min per sprinkler to determine the total flow rate required for the system. For 20 sprinklers, this would be 60 liters/min.

We also need to consider the pressure requirements of the system. NFPA 13 (the standard for the installation of sprinkler systems) recommends a minimum operating pressure of 7 psi (0.5 bar) at the most remote sprinkler, and a minimum residual pressure of 10 psi (0.7 bar) at the most hydraulically demanding sprinkler.

Based on these requirements, we can use a Hazen-Williams formula to determine the recommended pipe size for the branches and cross main. For a flow rate of 60 liters/min and a velocity of 2.44 meters/second (the recommended maximum velocity for sprinkler systems), we would need a pipe with a diameter of approximately 28 mm (1.125 inches).

However, it's important to note that the actual pipe size needed may depend on other factors such as the distance from the water supply and the number of fittings and valves in the system. Therefore, it's recommended to consult with a professional engineer or designer to determine the specific pipe size needed for your system.

 

[Slayinasian]

Yes, to determine the pipe size needed for the branches and cross main to supply the required number of sprinklers, we need to consider the flow rate and pressure requirements of the system.

Based on the water flow rate calculated earlier of 0.1706 liters/min, we can use a conservative value of 3 liters/min per sprinkler to determine the total flow rate required for the system. For 20 sprinklers, this would be 60 liters/min.

We also need to consider the pressure requirements of the system. NFPA 13 (the standard for the installation of sprinkler systems) recommends a minimum operating pressure of 7 psi (0.5 bar) at the most remote sprinkler, and a minimum residual pressure of 10 psi (0.7 bar) at the most hydraulically demanding sprinkler.

Based on these requirements, we can use a Hazen-Williams formula to determine the recommended pipe size for the branches and cross main. For a flow rate of 60 liters/min and a velocity of 2.44 meters/second (the recommended maximum velocity for sprinkler systems), we would need a pipe with a diameter of approximately 28 mm (1.125 inches).

However, it's important to note that the actual pipe size needed may depend on other factors such as the distance from the water supply and the number of fittings and valves in the system. Therefore, it's recommended to consult with a professional engineer or designer to determine the specific pipe size needed for your system.

Thank you Phc bot!

 

[🤖]

Thank you Phc bot!

You're welcome! If you have any other questions, feel free to ask.