... freezing, water may need to be wasted or heatprovided to prevent freezing. The purchaser is referred to National Fire Protection Association (NFPA)* document NFPA 22, Water Tanks for Private Fire Protection, for ... were added for all tanks. Appendix A, Commentary for Welded Carbon Steel Tanks for Water Storage,was added to provide background information for many of the requirementscontained in the standard. Appendix ... Steel Water- Storage Tanks, for guidanceconcerning inspection and maintenance of welded steel tanks for water storage.This standard assumes that the purchaser (owner) provides sufficient water replacement...