Trenchless Sewer Repair Methods
Over the past few years, trenchless pipe-lining has become a preferred method used to rehabilitate damaged pipelines. This trenchless technology is not only one of the most efficient methods but it is also versatile and can be used for various types of pipeline systems. There are multiple ways to repair pipes using a trenchless method. Some of these include CIPP, spray lining and brush coating, pipe bursting, and slip lining.
CIPP - Cured in Place Pipe Lining
CIPP lining, or cured in place pipe lining, is a method of pipe restoration used in existing pipe repair. This process is done to preserve current pipes that have been damaged by leaks, cracks, intruding roots, and rust. It increases the lifespan of a pipe system while also possibly preserving building structures and causing little to no damage to property.
Spray Lining and Brush Coating
Workers coat the structure of the pipe with either an epoxy, flexible polymer, or other resin. The resin can either be sprayed on or brushed on. The result is similar to CIPP. Spray lining or brush coating is great for stopping corrosion in cast iron pipes or getting rid of sewer gas from leaky joints. These two methods can also be used on pipes with a small diameter.
Pipe bursting is another trenchless method for fixing damaged sewer pipes. It involves pulling a high-density polyethylene replacement pipe into the old pipe with a winch. A bursting head leads the way and breaks up the damaged pipe so the replacement pipe can take its place.
Slip lining involves pulling a smaller diameter pipe into an existing pipe and then filling the space between them with grout. This can reduce the flow capacity of the pipe system. Slip lining is more invasive than other trenchless techniques and requires digging a larger pit for lowering the replacement pipe pieces. The grouting of space must be done properly or the new pipe could break.