The technology of trenchless sewer pipe repair
This technology is used for many applications that include manhole repairs, sewer line spot repairs, rehabilitation of sewer lining and the rehabilitation of water mains. Before fixing the problem with the sewer lines, it is important to undertake an inspection to determine the actual extent of the damage and to pinpoint the areas where the pipes have to repaired or replaced. Some contractors may use camera inspection but others have the CCTV cameras that monitor the condition of the sewer system. The video is run through the pipe to see the extent of repairs and to determine the length of the liner if it is the option that will be used that will cover the incoming pipe connections. Different technologies are available in the trenchless sewer pipe repair and it is important to be properly informed to determine the best and most cost effective process to rehabilitate the sewer lines.
The CIPP technology
CIPP or cured-in-place pipe is one of the most widely used technologies for trenchless sewer pipe repair for pipes that measure from 3” to 110”. In the CIPP process, a non-woven polyester tube that is made from felt is impregnated with a thermosetting resin with a catalyst. The pipe lining material is cut to correct length with a precise amount of self hardening resin throughout the inside of the fabric lining until it has been fully saturated. The liner is pulled inside the pipe using a cable up to the precise location so that the pre-cut connections can line up to where the incoming pipes are. Once the liner is inside in the pipes, a balloon will be inflated using either water or air pressure for about 2 to 3 hours while the resin heats up and the liner hardens. The resin mix will form a tight fit against the existing sewer walls. However, this technique cannot be used if the sewer pipe has collapsed.
Technology for spot repairs
Special sleeves or short sections of CIPP can be used to repair pipes in specific areas where there are damages. Pipe rehabilitation through special sleeves is a more cost effective option because only the damaged part is repaired and not the whole sewer line. Through the help of video inspection, the broken or cracked pipe’s location can be ascertained and a special sleeve can be installed in the most efficient manner through grout or epoxy. However, it is important for this repair method to be provided by experienced and skilled plumbers in order to achieve the long lasting benefits.