Smoke testing is a proven method of effectively identifying inflow (storm/ground water into sanitary sewers), connected roof and basement drains, yard drains, illegal taps, and storm sewer
cross connection. Reducing inflow and infiltration saves the costs of tereating ground water at wastewater treatment plants.
The environmental Protection Agency has advised municipalities to eliminate inflow and infiltration systems. Smoke testing sewer systems is an effective way to accomplish this goal.
Smoke testing is accomplished by isolating a section of sewer link, and introducing smoke into the line, vitalizing a smoke blower and a smoke generating device. Lines are first isolated using plugs, then smoke is introduced into the sewer system. The test crew then inspects the buildings, roof vents, street, and other potential sources of extraneous water.
The information is then recorded by location for corrective follow up.
Dye Testing is a safe and non-invasive way of testing sewers for leaks, illegal connections and cross-connections as well as for conducting small-scale flow studies in manholes, mains and laterals. When these powerful, brightly-coloured, non-toxic dyes are introduced into the sewer system they act as a strong indicator of flow source and can be used to determine where connections tie-in to existing systems and also how great the inflow from the source. Dye Testing is most often done in conjunction with other CCTV works such as mainline and lateral surveys or manhole inspections. Dye Testing is a cost-effective and efficient way to determine service status as well as to locate sources of I&I where they enter the system. The next time you are planning a CCTV project, consider how dye testing might be of use to you!