American Water Works Association AWWA C521-18 Plastic Ball Valves

This standard describes the selection and installation requirements for field-applied, mechanical, internal pipe joint seal assemblies for water service. Internal joint sealing is a method of in situ pipe joint rehabilitation that is used to correct leaking pipe joints; to strengthen weak joints or localized wall pitting and other structural defects at joints; to seal leaks at cracks; to prevent exfiltration or infiltration; or used in concert with other non-joint specific methods of pipe rehabilitation (cement–mortar lining, cured-in-place pipe lining, etc.).This standard can be referenced in specifications for selecting or installing internal pipe joint seal assemblies for water piping. The stipulations of this standard apply when this document has been referenced and then only to field-applied internal joint and wall seal assemblies for drinking water piping.