ASTM F2304-22

Overview

ASTM F2304-22: Standard Practice for Sealing of Sewers Using Chemical Grouting establishes comprehensive procedures for the inspection, testing, and sealing of sewer pipe joints through the application of chemical grouting, specifically using the packer method. Developed by ASTM International, this standard guides utilities, contractors, and municipal engineers in reducing infiltration and exfiltration in sanitary, storm, and combined sewer systems, thereby improving system integrity and environmental compliance.

Key Topics

• Inspection and Testing: The standard details the use of closed-circuit television (CCTV) for identifying defective pipe joints and documenting repair needs. It includes guidelines for pressure testing sewer joints to detect infiltration or exfiltration.
• Chemical Grouting Methods: Instructions are provided for the use of a packer device to inject chemical grout around pipe joints. The standard covers various grout types, such as acrylamide, acrylic, and urethane-based grouts, and sets out their performance expectations.
• Grout Selection and Handling:
  • Grout must be environmentally safe and compatible with pipeline conditions.
  • Procedures to ensure proper mixing, handling, and field application are outlined.
  • Use of additives to strengthen the cured grout, increase viscosity, or inhibit root growth if required.
• Limitations: This practice is not to be applied on pipes with longitudinal cracks, structural deficiencies, severe corrosion, or out-of-round deformations. High groundwater pressure applications may require consulting equipment manufacturers.
• Safety Considerations: Emphasis is placed on proper training in handling equipment (hoses, pumps, compressors, etc.) and chemical grouts. Recommendations for personal protective equipment (PPE), storage, and disposal are included to promote worker health and environmental protection.

Applications

• Optimizing Sewer Performance: By effectively sealing leaking joints, utilities can minimize groundwater or surface water intrusion, reducing treatment costs and preventing sanitary sewer overflows.
• Non-Structural Rehabilitation: Chemical grouting is a trenchless method for sealing leaks without replacing pipe sections, minimizing public disruption and protecting existing infrastructure.
• Compliance and Documentation: The practice supports regulatory compliance by documenting inspection, testing, and repair, which is essential for reporting to municipal or environmental authorities.
• Broad Utility: Applicable to pipe diameters from 6 to 42 inches, with adaptations possible for larger diameters. Suitable for use in sanitary, storm, and combined sewer systems.
• Flow Control: Instructions on managing sewer flow, using bypass pumping or plugging, ensure safe and effective joint testing and sealing operations.
• Quality Assurance: The standard incorporates field procedures for checking equipment calibration, verifying grout gel times, and post-sealing testing for each joint.

Related Standards

• ASTM C1920 - Practice for Cleaning of Vitrified Clay Sanitary Sewer Pipelines: Guidance on necessary cleaning before grouting.
• NASSCO Specifications Guidelines:
  • Wastewater Collection Systems Maintenance and Rehabilitation
  • Sewer Line Cleaning
  • Television Inspection of Main Sewers
• Other Sewer Rehabilitation Standards: Refer to ASTM and NASSCO resources for compatible practices on inspection, cleaning, and rehabilitation of underground utility infrastructure.

Keywords: ASTM F2304-22, sewer joint sealing, chemical grouting, packer method, sewer rehabilitation, infiltration reduction, exfiltration control, trenchless technology, CCTV sewer inspection, grout selection, sewer maintenance standards, pipeline leak sealing, environmental compliance.