Re: Firewall Capacity VolumeFrom: DavidR@Fast.net 
Date: Wednesday, February 22, 2012
Time: 12:00:39 AM
Remote Name: 18.104.22.168
CommentsReading NFPA 30 again, I find that it does not really define capacity. However, 22.214.171.124.2 says The volumetric capacity of the diked area shall not be
less than the greatest amount of liquid that can be released from the largest tank within the diked area, assuming a full tank. and 126.96.36.199.1 refers to Tank Capacity while table 188.8.131.52 refers to Operating Liquid Capacity and Appendix A contains this: An aboveground storage tank dike is normally sized to contain the entire contents of the largest single tank within it. Some designs incorporate sufficient freeboard additional capacity to accommodate precipitation or fire-fighting water. The amount of this freeboard is usually governed by local conditions. I have seen this specified as an additional percentage or a set dimension. Good luck with your quest, I suggest that the local regulations be found and the owners insurance and risk team be consulted.