AWWA Comment Period on ANSI/AWWA D100-20 – Welded Carbon Steel Tanks for Water Storage

AWWA Comment Period on ANSI/AWWA D100-20 – Welded Carbon Steel Tanks for Water Storage
November 27, 2020

AWWA solicits public comments on all proposed new AWWA Standards, and on all proposed revisions, reaffirmations, or withdrawals of existing AWWA Standards. The referenced standards project is being considered for approval and the publication of this notice begins the 45-day public comment period for AWWA and ANSI. An electronic public review copy of the proposed standard can be obtained for review during the comment period by emailing etssupport@awwa.org. Comments must be submitted in writing to the AWWA contact listed below no later than the last day of the comment period specified herein. Such comments shall be specific to the section(s) of the standard under review and include sufficient detail so as to enable the reader to understand the commenter's position, concerns and suggested alternative language, if appropriate.

AWWA Comment Period closes on January 11, 2021.

Send comments to:
Frank Kurtz
303.347.6221 phone
303.795.7603 fax

The review copy will be edited for publication and may also be revised as appropriate based on any comments received during the public comment period. Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.

Final publication of the standard may take several months. When it is available, a notice will be published in the official notice section of Journal - American Water Works Association. The standard becomes an effective AWWA standard on the first day of the month following such publication in Journal - American Water Works Association. 

SCOPE
The purpose of this standard is to provide minimum requirements for the design, construction, inspection, and testing of new welded carbon steel tanks for the storage of water at atmospheric pressure.

MAJOR REVISIONS
Major changes made to the standard in this edition include the following:
1.Section 1 was revised to show the latest edition of references.
2.Section 2 was revised to eliminate obsolete material references (i.e., ASTM A283/A283M, grades A and B).
3.Section 3 was revised to include risk category definitions from ASCE 7-16. Snow and wind loads were revised to comply with ASCE 7-16. The basic wind speed map was deleted and a reference to the basic wind speed map in ASCE 7-16 was added. Material class 0 and related unit
stresses were deleted. Method 1 for determining the allowable local buckling compressive stress F1 for shells was revised to use the requirements of reference 11 in Sec. A.1.4, Method 2 was deleted, and Method 3 was renamed Method 2. Ladder, handrail and guardrail loads were removed and
references to OSHA and ASCE 7 were added. Additional rules for shell girders and roof knuckles were added. Design requirements for anchorages were clarified. 
4. Section 12 was revised to update the safety factors for deep and shallow foundations based on the level of testing employed.
5. Section 13 was revised so that seismic load complies with ASCE 7-16. The site classification procedure was deleted and a reference to the procedure in ASCE 7-16 was added. Spectral response acceleration maps and the long-period transition period map were deleted and references to the maps in ASCE 7-16 were added. The vertical design acceleration was revised to include values for
respsonses limited by buckling and responses not limited by buckling. Minimum freeboard requirements were made mandatory of all styles of tanks. The sloshing wave height equation was revised to match ASCE 7-16. The equation for allowable lateral shear for flat-bottom tanks was
revised to show a service-level allowable similar to API 650 and ASCE 7-16.
6. Section 14 was revised to eliminate references to withdrawn material specifications (i.e., ASTM A442 and A678).