| AWWA COMMENT PERIOD ON AWWA D121, Bolted Aboveground Thermosetting Fiberglass-Reinforced Plastic Panel-Type Tanks for Water Storage
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AWWA COMMENT PERIOD ON AWWA D121, Bolted Aboveground Thermosetting Fiberglass-Reinforced Plastic Panel-Type Tanks for Water Storage

AWWA COMMENT PERIOD ON AWWA D121, Bolted Aboveground Thermosetting Fiberglass-Reinforced Plastic Panel-Type Tanks for Water Storage
April 3, 2024

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 ETS Support (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 May 20, 2024.

Send comments to:

Amanda Dail, ADail@awwa.org
303.347.6285 phone

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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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.


This standard describes the design, fabrication, construction, inspection, and testing of bolted aboveground thermosetting fiberglass-reinforced plastic (FRP) panel-type tanks for potable water, reclaimed water, and non-potable water. Requirements for the fabrication, design, construction, and testing of FRP panels, concrete and steel foundation members, steel bolts, and accessories are included. Site elevation and procurement; tank sizing; post-commissioning inspection and maintenance; and the design, operation, and control of the water distribution system that connects to the bolted aboveground thermosetting FRP panel-type (BATFRPP) tank are beyond the scope of this standard.


Major revisions made to the standard in this edition include the following:
1. A section on chlorine and chloramine degradation of elastomers was added to the Foreword (Sec. II.H).
2. Reclaimed water and non-potable water were added to the Scope (Sec. 1.1) and definitions were added for potable water, reclaimed water, and wastewater (Sec. 3).
3. NSF/ANSI/CAN 61 requirements were updated to include all tank parts in contact with potable water, rather than call out specific parts (Sec. 4.1).
4. The bolts ASTM references were updated to remove withdrawn standards (Sec. 4.2.1, Sec. 4.9.1).
5. The minimum compressive strength of FRP panels was updated under Sec.
6. Bolts sections were updated to clarify the intended location of use and a grade restriction was added for foundation anchor bolts (Sec. 4.9.1 and 4.9.2).
7. PVC materials were added as acceptable roof gaskets under Sec. 4.11.1.
8. EPDM gasket materials were added for wall and floor gasket materials (Sec. 4.11.2). Both Tables 1 and 2 have updated properties.
9. Tank design shall consider the interaction of the tank with the building or support structure (Sec. 5.1).
10. Roof live load was revised in accordance with ASCE/SEI 7-22 (Sec. 5.2.4).
11. Rain load was added to Sec. 5.2.8 and relevant equations updated.
12. Design notation was clarified, and relevant equations updated (Sec. 5.3.2).
13. Added Seismic Risk Categories (Sec. and renumbered Sec. 5.3.3 accordingly.
14. Equations were updated, including some factors, and renumbered throughout. The examples in the Appendix were updated accordingly.
15. Sec. 5.4.7 was deleted.
16. Figure 5 was removed and figures renumbered accordingly.
17. The terminology regarding foundation design was revised (Sec. 5.8 and Figure 6).
18. Requirements for OSHA compliance were added (Sec. 7.5).
19. Language regarding screening of vents was added (Sec. 7.6.2).
20. Cold exposure conditioning was reduced from 16 hr to 4 hr. (Sec 8.7.4).
21. Verification and delivery sections were added (Sec. 11 and 12).