Industrial sewers are often connected to the liquid-tight pavement and often consists of different components such as piping system, receiver points (whirl or gatters), separator installations and sewerpits.
It is recorded in laws and regulations that industrial sewers must be designed based on impermeability. Drainage of waste water via an industrial sewer includes a high risk of the formation of soil contamination with it, since the industrial sewer is often a collection point for materials contaminating the soil, and the process takes place outside your field of vision. In practice, proven by many checks sewer systems show defects and could thus be a major cause of soil contamination. Testing now can prevent huge costs in the future.
The parts to be inspected first need to be emptied and cleaned, before starting the inspection activities. Then, the parts of the system are pressurised with water, if possible in sections to increase accuracy. So possible defects may be indicated specific to the location. A small leakage loss is permitted depending on the size of the pipeline system.
The results are reported in an inspection report. If no defects are observed, a Impermeable Facility Certificate will be issued. If defects are observed, they need to be repaired or further investigated in order to determine at what point the defects are located in the system.
There are still other methods to assess industrial sewers, camera inspection is one of them.
SFA-Testsystemen carries out inspections using a mobile camera for delivering new building projects or a closer investigation. A camera inspection literally gives you an image of the sewer as recorded using robotic cameras. Sewer inspections are carried out in this regard by certified inspectors in compliance with NEN 3399. Such a camera inspection can however not result in a Impermeable Facility Certificate; the method described for inspecting industrial sewers for impermeability is required for this purpose.
Besides images, even technical aspects such as the angle of the tubes (gradient) can also be measured. The measurement results are converted into a length profile using specially developed software. Tube connections can also be represented in these length profiles, so that any vertical angular displacements are also clearly viewed.
Inspection and maintenance
So as to prevent componanies spending much time in regularly assessing the facilities in your company, the possibility of establishing a practically organised inspection and maintenance programme immediately improves efficiency. You thus dispense with discussions with authorities about:
– Frequencies of inspection and maintenance
– Which facilities need to be assessed
– The manner in which they are assessed