Guide Pulley Set Mean?
a guide pulley set is a set of pulleys that are positioned so as to enable proper insertion of a liner into the pipe to be rehabilitated. Trenchless rehabilitation techniques are done through manholes or entry and exit excavations.
It is necessary to ensure that the liner that is inserted is accurately inserted to prevent uneven installation or excess liner within the host pipe, creating air pockets or uneven surfaces in the final installation.
Trenchlesspedia Explains Guide Pulley Set
The cured-in-place pipe (CIPP) and thermoformed pipe methods of installation require the insertion of a resin-soaked liner within the damaged pipe section. In order to ensure proper insertion, the liner is drawn from a supply reel onto an inlet pulley into the host pipe. The liner runs over a guide pulley in the reel supply truck under which is a container containing the adhesive resin. In the midst of the container is an applicator device with two applicator rollers between which the liner is made to pass. The coated liner passes over two guide pulleys set at the edge of the host pipe ensuring that the liner is flat. The first guide pulley is then pulled through from the other end till the required section is correctly placed.