The sewer line of 700 mm dia. Using RCC NP3 was laid in Rampur city, which was connected to the sump well in the treatment plant. For some reasons the sewer line could not be commissioned for about 7/8 years and by the time the infrastructure was ready for the sewer to be commissioned, sewer line started settling, due to heavy ground water infiltration. This infiltration caused the send to flow in with the water causing the ground above the sewerline to settle posing the danger to nearby residential houses and buildings. Also the road had to be closed for traffic due to frequent settlements.

Onsite India, being the expert in such emergency services was approached by U. P. Jal Nigam to study the problem and rectify the same immediately, as the monsoon was approaching soon and the department had the pressure to commission the line urgently so that the entire sewage could be treated to reduce the pollution in the river.

An expert team of engineers was deputed on site to start the work the same day upon getting the confirmation from the department. The strategy, in consultation with the department engineers, was made so that the job could be completed within the specified time. The part of the strategy was to do the conditional assessment of the affected sewer line first using CCTV camera. Upon the condition assessment it was found that the pipeline had very wide open joints giving the free passage to the ground water to flow inside carrying the sand along.

After finishing the condition assessment, it was decided by the department to rehabilitate the sewer line using CIPP technology. Now the next challenge was to install the CIPP liner inside the pipeline as the infiltration was continuous. And if there was a time gap between cleaning and liner installation the pipeline will be filled back again with sand which will find free space to flow in with the water. Therefore, it was decided to install the liner immediately after cleaning. The size of the host pipe was measured at the mouth of the manhole to design the liner. The liner was kept ready at site by the time the cleaning was supposed to be complete for the particular stretch between two successive manholes. The process of liner installation was immediately started as soon as the cleaning was complete. However, the infiltration was so heavy that cleaning by high pressure water jetting machine and installation of the liner was done parallelly.

The next challenge was the preparation of the CIPP Liner, as we had all the machinery and plants in Delhi, and there was hardly any time to shift the entire setup to Rampur, which was not only time taking but costly also. Therefore, it was decided to transport the impregnated liner from Delhi to Rampur. The liner temperature has to be maintained below 30oC till the liner is installed and maintaining that in the month of June was very challenging. Finally this was made possible by a hardworking, very well experienced and dedicated team of engineers and other team members.

Finally the project was completed successfully before the targeted date
Diameter: 700mm
Depth of sewer:4/5 meters