Water Distribution for School

[PBW2]

We are designing a water system to provide potable and fire protection for a school. We have been given the following design criteria: for potable 150 gpm @ 60 psi and for fire protection a volume of 35000 gallons will be required. The system will have to be fed from a well with a storage tank and fire pumps.

We are looking for ideas on how to set the system up and also any text books or websites to assist in the design. Initial thoughts were to use a hydropneumatic tank for potable and a separate tank for fire protection.

We appreciate any and all ideas and comments.

 

[redbridge]

I would design a tank with a portion of the volume designated for fire protection only, and a portion for potable use. In other words if the tank height is 20 feet tall, the first 10 feet would be for fire protection and last 10 for potable water. This would mean that you would never let your tank get below the half full mark since the 2nd half is designated for fire protection. You would probably want two well pumps (one for backup) sized so they would run about 8 to 12 hours a day. You will probably need two lines running into the school, one for fire and one for potable use. If it is an elevated storage tank then you wont need fire pumps or hydropneumatic tank. If it is a ground storage tank then you would need fire pumps but I would use pumps with vfds in stead of hydropneumatic pump station. Hope this helps.

 

[bimr]

You have not provided a lot of information to start. You need more definition on the fire flow scenario.

You probably need to compare the cost of a system with well, ground storage tank, and booster pumps, to a system with a well and elevated storage tank. The ground storage tank, and booster pump system is going to be more complicated since you have to supply water over a range of flow conditions from nightime to peak usage.

Include provision for standby pump and emergency power equipment in the system with storage tank and booster pumps.