AWWA Articles

AWWA Comment Period on ANSI/AWWA D120 – Thermosetting Fiberglass-Reinforced Plastic Tanks

April 12, 2019 

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 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 closed on 5/27/19. 

Send comments to:
Emily Meek
303.347.6192 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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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. 

This standard describes the composition, performance requirements, construction practices and workmanship, design, and methods of testing thermosetting fiberglass-reinforced plastic (FRP) tanks for the storage of water or other liquids used in water supply service. 
1.1.1 Limit of standard. This standard is limited to atmospheric pressure, vented, cylindrical, and spherical tanks, installed either aboveground or underground.
1.1.2 Temperature limits. This standard is limited to tanks whose service temperature does not exceed 180°F (82°C) for aboveground tanks and 150°F (66°C) for underground tanks. Consult the tank manufacturer for recommended temperature limits (both minimum and maximum) for specific equipment and service requirements.
1.1.3 Service limits. The service limits for environmental exposure and structural loads shall be determined based on tests of laminates that are determined by the engineer to be representative of the materials and methods of fabrication used in the tank. 

Major revisions made to the standard in this edition include the following: 

  1. An advisory statement was added in the Foreword (Sec. II.A) regarding chlorine and chloramine degradation of elastomers. 
  2. Classification terminology has been updated from Type I and II, to Class I and Class II. 
  3. Clarify requirements for venting in 4.4.5. 
  4. Clarify wall thickness requirement as applicable to single wall and primary wall of double-wall tank in 4.6.1. 
  5. Hydrostatic production tests have been separated for aboveground and underground tanks in and 
  6. Update reference to current ASTM standard for light and water exposure in 5.5.3. 
  7. Limit strength and bending tests to threaded steel pipe fittings in 5.6.1 and 5.6.2. 
  8. Remove reference to FRP straps in appendix B.2. 
  9. Clarify requirements for Manway Enclosures in appendix C.3. 
  10. Delete appendix C.7 on Turbine Enclosures, incorporating applicable requirements in appendix C.3. 
  11. Add requirement for flexible coupling or fitting at flanged tank nozzles in appendix D.3.