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AWWA C621-25 Internal Pipe Joint Seal Assemblies for Water Service, 2025
- Foreword [Go to Page]
- I. Introduction. [Go to Page]
- I.A. Background. Internal joint pipe repair or sealing is a method for no-dig rehabilitation of leaky joints in water transmission mains. This method of joint repair can be used to correct leaking pipe joints, strengthen weak joints, seal leaks at cracks, [Go to Page]
- I.B. History. The AWWA Standards Committee for Pipe Rehabilitation was formed in 1998 to develop standards on the topic. Development of this standard was authorized and initiated in 2009 in response to the water industry’s request for a standard on intern [Go to Page]
- I.C. Acceptance. In May 1985, the US Environmental Protection Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF*) to develop voluntary third-party consensus standards and a certification program for direct
- II. Special Issues. [Go to Page]
- II.A. Chlorine and Chloramine Degradation of Elastomers. The selection of materials is critical for water service and distribution piping in locations where there is a possibility that elastomers will be in contact with chlorine or chloramines. Documented [Go to Page]
- II.B. Advisory Information on Material Application. This standard defines the materials and methods for installation of flexible internal joint seals used in water transmission mains. Though some details may vary, all of the joint seals available on the m
- III. Use of This Standard. It is the responsibility of the user of an AWWA standard to determine that the products described in that standard are suitable for use in the particular application being considered. [Go to Page]
- III.B. Modification to Standard. Any modification of the provisions, definitions, or terminology in this standard must be provided by the purchaser.
- IV. Major Revisions. Major revisions made to the standard in this edition include the following:
- V. Comments. If you have any comments or questions about this standard, please call AWWA Engineering and Technical Services at 303.794.7711; write to the department at 6666 West Quincy Avenue, Denver, CO 80235-3098; or e-mail at standards@awwa.org.
- AWWA Standard
- SECTION 1: GENERAL
- Sec. 1.1 Scope
- Sec. 1.2 Purpose
- Sec. 1.3 Application
- SECTION 2: REFERENCES
- SECTION 3: DEFINITIONS [Go to Page]
- Figure 1 A sample internal joint seal assembly (component terminology may differ by manufacturer)
- Figure 3 Seal gasket contact area
- Table 2 Joint deflection and misalignment (offset) tolerances* [Go to Page]
