Spray lining techniques are primarily employed in the rehabilitation of large-diameter pipes and other man-entry size assets in wastewater management, stormwater collection and potable water conveyance systems. However, we sometimes get questions about using Sprayroq spray-applied lining systems for small diameter (non-man-entry) pressure pipelines.
Often with these types of pipeline rehabilitation projects, the principal objective is to remove scale and corrosion, followed by application of a coating intended to inhibit further deterioration. This coating may also seal very minor leaks, but that is a secondary characteristic and not the main purpose of such linings. The most common materials used for this purpose are cement mortar or epoxy resin, which are applied using a robotic spraying machine that is winched through the pipe at a constant, predetermined rate.
The formulation of Sprayroq protective and structural spray-applied lining products currently requires their application using our larger heating, mixing and pressurized spraying equipment that won’t fit inside non-man-entry assets. We’re always engaged in research and development on additional applications for our products, including spray-lining techniques for non-man-entry sewers, but so far no such method has been perfected to our standards. We have yet to create a system of mixing, heating and application of a formula that will not only successfully accommodate the smaller work area, but will also achieve the performance characteristics demanded by the industry, and which we demand of our own products.
As with all businesses, we at Sprayroq must allocate the majority of our resources to the development of products requested by the bulk of our customers. There has been far less demand for spray-lining products for smaller diameter pressure pipes, partly because of the different requirements of sewer renovation, where the aim is usually to increase the pipe’s resistance to external loading (structural strength) in addition to preventing corrosion. However, as the markets and their attendant technologies evolve and we explore new products and applications, rest assured that Sprayroq’s attention and efforts will continue to lead, and not follow, the market.