ANSI/AWWA D100-11 (Revision of ANSI/AWWA D100-05)
AW A W WA Standard Standa rd
Welded Carbon Steel Welded Steel Tan Tanks ks for Water Storage SECTION 1: Sec. 1. 1.1 1
GENER AL
Scope Te purpose of this standard is to provide minimum requirements for the design, construction, construction, inspection, and testing of new welded carbon steel tanks ta nks for the storage of water at atmospheric pressure. 1.1.1 Tank roofs. All tanks storing storing potable water shall have have roofs. anks storing nonpotable water may be constructed without roofs. 1.1.2 Items not covered. Tis standard standard does not cover all details of design and construction because of the large variety of sizes and shapes of tanks. Details that are not addressed shall sha ll be designed and constructed to be adequate and as safe as those that would otherwise be provided provided under this standard. sta ndard. Tis standard does not cover concrete–steel composite tank construction.* With the exception of aluminum dome roofs, roofs, this standard does not cover tanks constructed with materials other than carbon ca rbon steel. Tis standard does not cover painting and disinfecting of tanks (see ANSI/AWWA D102, Coating Steel Water-Storage anks, and ANSI/ AWWA A WWA C652, C652, Disinfection Disinfection of Water Water-Storage -Storage Facilities Facilities). ). 1.1.3 Design method. With the exception of reinforced concrete foundations, this standard is based on the allowable-stress design method.
* Refer to ANSI/A ANSI/AWWA WWA D107, D107, Composite Elevated anks for Water Storage. 1 Copyright © 2011 American Water Works Association. All Rights Reserved.
2
AWWA D100-11
Sec. 1.2
Definitions Te following definitions shall apply in this standard: Capacity: Te net volume, in gallons (liters), that may be removed from a tank filled to top capacity level (CL) and emptied to the bottom capacity level 1.
(BCL). 2.
Constructor:
Te party that furnishes the work and materials for place-
ment and installation. 3.
Elevated tank:
4.
Head range:
5.
Potable water:
A container or storage tank supported on a tower. Te vertical distance between the CL and BCL. Water that is safe and satisfactory for drinking and
cooking. 6.
Purchaser: Te person, company, or organization that purchases any
materials or work to be performed. Reservoir: A ground-supported, flat-bottom, cylindrical tank having a shell height equal to or smaller than its diameter. 7.
8.
Standpipe:
A ground-supported, flat-bottom, cylindrical tank having a
shell height greater than its diameter. 9. Tank: An elevated tank, a standpipe, or a reservoir. 10.
Water levels:
Te following water levels are used in this standard:
Bottom capacity level (BCL): Te water level above which the specified capacity is provided. In a ground-supported tank (reservoir or standpipe), the 10.1
BCL shall be the water level in the tank shell when the tank is emptied through the specified discharge fittings, unless otherwise specified. 10.2 Maximum operating level (MOL):
Te specified maximum water
level under normal operating conditions. Te MOL shall be taken as the CL, unless otherwise specified. 10.3 op capacity level (CL):
Te water level defined by the lip of the
overflow.
Sec. 1.3
Drawings to Be Provided Construction drawings for the foundation, tank, and accessories shall be provided. Where foundation and tank design are performed by separate parties, each party shall provide construction drawings. If anchorage is required, anchorage details, including required embedment, local reinforcement, and minimum required concrete strength, shall be provided as part of the tank design. Details of all welded joints shall be provided when specified. Standard weld symbols as listed in ANSI/AWS A2.4, Standard Symbols for Welding, Brazing,
Copyright © 2011 American Water Works Association. All Rights Reserved.
