Smoke tests for sewage and drainage intersections

During rain storms, sewage systems are often flooded and overflows, the manholes covers rise up, inspection manholes in road open up and endanger the surroundings. The reason for these problems is the existence of prohibited connections (according to the water law and its regulations) between sewage to drainage systems.

Such intersections can be tested by performing smoke tests.

Further advantages of the test:

• Rain water flow prevention to waste-water treatment plants (savings in treatment costs);
• Prevention of sewage flow to rivers and to the ocean;
• Prevention of sewage smells from drainage receptors.

The test is performed by insertion of harmless smoke into the sewage system by bellows. The smoke is dispersed in the system to a distance of a few hundred meters and leaves the system from every opening of the line, including drainpipes, drainage receptors and breaks in the pipeline and manhole connections to the surface.