High quality polyethylene resins are used for HDPE pipe lining as a cost effective solution for a broad range of piping issues in agricultural, industrial, marine, mining and municipal applications. Marine applications also use it below the surface, on the surface, floating on water and above ground.
Pipe that has an hdpe pipe lining can carry a multitude of products, ranging from hazardous waste and chemicals to potable water and gases. It serves the gas, oil and mining industries, among others. It has the lowest frequency of repair per mile every year as compared with other pressure pipe materials used for urban gas distribution.
Lining Installation
High density polyethylene lining begins as a liner for pipe with an outside diameter that is larger than the inside diameter of the steel pipe it is protecting. It is installed in sections, with the maximum length of a section being one mile.
A wire line cable is sent through a section of pipeline and is then attached to the liner pipe. The internal liner is pulled by the wire line through the roller reduction box which is located where the liner is inserted for the pipeline section. As it passes through this box, the liner is under tension and is compressed radially, keeping it at a reduced diameter. Once the tension is released, a tight fit is created as the liner pipe expands against the inside of the steel pipe.
Benefits of Using HDPE Pipe Lining
Physical abrasion as well as biological and chemical processes cause pipeline to degrade over time. The use of a high density polyethylene lining is a cost effective way to prevent corrosion of a pipeline and rehabilitate it.
This type of lining does not rot, rust or corrode and is resistant to biological growth. This means that it extends the service life of pipe and thereby provides long term cost savings.
It can also reduce the amount of slow crack growth fractures which are the result of steady growth of a crack with little deformation in the plastic material and rapid crack propagation where cracks travel at long distance very quickly.
As a solution that uses trenchless technology, it can be used to rehabilitate underground pipes with little disruption to surface traffic, business, and other activities, keeping the community safe and secure during installation.