Update to NFPA Standards for Water Storage

The NFPA 22 2018 edition was recently released with some changes that will impact the design of bolted steel tanks for fire protection. These revisions will reduce the costs of bolted steel tanks without compromising quality or performance. Below is a comparison of the latest changes to the NFPA 22:  
Criteria2013 NFPA 222018 NFPA 22
In tank electric immersion heaters allowedNoYes
Bolted tank floor sheets placed directly on 4 mill polyethylene baseYesNo
Minimum tank ringwall foundation embedment2’-6” or below frost depth1’-0” or below frost depth
Minimum discharge pipe size< 25,000 gallons = 6” dia. <100,000 gallons = 10” dia. >100,000 gallons = 10” dia.6” dia. and based on hydraulic demand
Minimum bottom ring thickness3/16” or use reduced tensile capacity equationStandard AWWA D103 requirements
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