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Determining the Capacity of Water Tank for Fire Fighting!
- Thread starter mashaa
- Start date
TravisMack
Mechanical
Look in the IFC for site waterflow demands and durations.
Travis Mack
MFP Design, LLC
Travis Mack
MFP Design, LLC
If you are talking about a system with private hydrants in accrdance with NFPA 24 and deluge systems on oil filled transformers, then no NFPA standard is going to tell you what size the water tank should be.
If your brief is just to use NFPA, you would need to have discussions with the stakeholders (owner, AHJ, insurer, fire protection consultant if there is one) to work out what tank size you should use.
As a starting point you could use the IFC as a guide.
If your brief is just to use NFPA, you would need to have discussions with the stakeholders (owner, AHJ, insurer, fire protection consultant if there is one) to work out what tank size you should use.
As a starting point you could use the IFC as a guide.
Easy, look for NFPA 850 (recommended practice).
Basically it says:
- 500gpm for 2 hrs plus the design scenario systems demand (i.e fixed or mobile systems like sprinklers, deluge systems, foam equipment, monitors, etc. involved in a reasonable design fire scenario with simultaneous water demand with their respective design duration).
- The 850 does not tell if the mobile equipment should be included or not in the 500gpms
- This will give a design water flow and a water reserve volume. The water reserve design volume should be replenished on 8 hrs or less.
If possible consider more water for long fire combat operations, cooling or after fire washing up.
Basically it says:
- 500gpm for 2 hrs plus the design scenario systems demand (i.e fixed or mobile systems like sprinklers, deluge systems, foam equipment, monitors, etc. involved in a reasonable design fire scenario with simultaneous water demand with their respective design duration).
- The 850 does not tell if the mobile equipment should be included or not in the 500gpms
- This will give a design water flow and a water reserve volume. The water reserve design volume should be replenished on 8 hrs or less.
If possible consider more water for long fire combat operations, cooling or after fire washing up.
- Thread starter
- #5
The water tank capacity will be based on the sprinkler flow duration and no. of hose stream requirement assuming no inflow of water from the make up source. Flow duration and hose stream requirement can be obtained from your fire insurance carrier. Then from past results that I have noted, it will not be enough water as the storage tanks get filled with sediment with time. So tack on a minimum extra capacity of 50%.
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