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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 Water is withdrawn in emergency situations through piping connected to a suction pump

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DESIGN CODES & STANDARDS

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NFPA 22--, ‘‘Standard for Water Tanks for Private Fire Protection’’

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FM Approval” Standard for Steel Tanks for Fire Protection’

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STORAGE TANK ENGINEERING FOR

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WELDED STORAGE TANKS

BOLTED STORAGE TANKS

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American Water Works Association (AWWA)

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AWWA D 100 -, ‘‘AWWA Standard for Welded Carbon Steel Tanks for Water Storage’’

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AWWA D 102- , ‘‘AWWA Standard for Coating Steel Water Storage Tanks’’

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AWWA D-103-, ‘‘AWWA Standard for Factory Coated Bolted Steel Tanks for Water Storage’’

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DESIGN CALCULATION LOADS 

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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.

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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.

žFM Approvals recognizes five (5) earthquake zones: 50-year; 100-year; 250-year; 500-year; and >500-year

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Materials Selection

Material selection according to

 AWWA D103 (for bolted tanks)

 AWWA D100 (welded and elevated tanks)

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