Pressure testing of lateral connections
1. Visual inspection by CCTV
After cleaning the inspection is performed with a push- or satellite swivel camera. These cameras have a moveable head, which holds a light-sensitive object.
This technology allows to enter the lateral connection up to 50 m (165 ft.) deep. The camera is controlled by an operated in an inspection van.
The whole camera tour is digitally recorded and stored on DVD for the client.
2. Pressure testing with air or water
In case the CCTV inspection does not give reliable information of the tightness, the pipe is tested additionally with water or air in accordance with DIN 1610. Air or water is pumped into a blocked of part of the pipe.
Then the water or air loss is measured.
If the loss is within a prescribed value, no rehabilitation is necessary and the client will receive a certificate of tightness.. If there is a need for repair we can give you a quote - depending on the damaged part – for the trenchless repair.
3. Documented evidence
Independent from whether the tightness has been proven visually or technically. You’ll receive a certificate of all measures conducted in your lateral connection, which is accepted by the respective authorities.
In case that more than one lateral connection in a given street can be inspected from the main sewer the cost per lateral is less. So ask your neighbor, if a joint order should e performed.
5. Paragraph 61 State Water Law NRW
The legislator in NRW determines how main line and lateral connections are to be tested for tightness. The decisive law is § 61 State Water Law. The State Ministry for the Environment has published a brochure, which shows the most important information.
Excerpt from the revised State Water Law of December 6th, 2007; § 61 a: Private Waste Water Installations
1. Private waste water installations are to be located, installed and maintained in such a way, that they are operationally safe (…). Sewer lines must be closed, tight and (…) able to be cleaned.
3. The owner of a property must have sewer pipes laid in the soil or otherwise non-accessible inspected for tightness by a certified expert (…). The results of such inspection must be certified (…). The inspection must be repeated in intervals of 20 years.
For existing sewer lines the municipality must issue a directive for shorter time spans for the first time inspection according to passage 4, sentence 1, if such sewer lines are located on a property within a groundwater protection zone and 1. serve for the discharge of industrial or commercial waste water and have been built prior to January 1st, 1990 or, 2. serve for the discharge of private waste water and were built prior to January 1st, 1965.