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Ground supported, flat bottom steel tanks consist of a bottom plate, cylindrical shell and a roof fabricated from steel plates joined together, all of which rest upon a foundation. Tanks are filled with water from an outside source. Water is withdrawn in emergency situations through piping connected to a suction pump
DESIGN CODES & STANDARDS
NFPA 22--, ‘‘Standard for Water Tanks for Private Fire Protection’’
FM Approval” Standard for Steel Tanks for Fire Protection’
STORAGE TANK ENGINEERING FOR
WELDED STORAGE TANKS
BOLTED STORAGE TANKS
American Water Works Association (AWWA)
AWWA D 100 -, ‘‘AWWA Standard for Welded Carbon Steel Tanks for Water Storage’’
AWWA D 102- , ‘‘AWWA Standard for Coating Steel Water Storage Tanks’’
AWWA D-103-, ‘‘AWWA Standard for Factory Coated Bolted Steel Tanks for Water Storage’’
DESIGN CALCULATION LOADS
Design Loads
Tanks are designed to withstand the dead load of all permanent construction, a water load filled to just overflowing, a roof live (snow) load and a wind load. In addition, tanks that are located inareas in which a seismic event is likely to occur are also designed to withstand the anticipated earthquake loads.
A wind loads with peak speeds
An earthquake load shall be considered for all tanks located in FM Global Earthquake Zones 50-year through 500-year.
FM Approvals recognizes five (5) earthquake zones: 50-year; 100-year; 250-year; 500-year; and >500-year
Materials Selection
Material selection according to
AWWA D103 (for bolted tanks)
AWWA D100 (welded and elevated tanks)
