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:
Read More “Update to NFPA Standards for Water Storage”
|Criteria||2013 NFPA 22||2018 NFPA 22|
|In tank electric immersion heaters allowed||No||Yes|
|Bolted tank floor sheets placed directly on 4 mill polyethylene base||Yes||No|
|Minimum tank ringwall foundation embedment||2’-6” or below frost depth||1’-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 thickness||3/16” or use reduced tensile capacity equation||Standard AWWA D103 requirements|