It can be utilized on cast iron, steel, concrete, brick, asbestos-cement, corrugated metal and even wood stave pipe, in diameters from 4 inches to more than 22 feet. The process is accomplished with equipment specially designed and manufactured by Spiniello.

In addition to lining of pipe that is being rehabilitated, the SpinCo. CML Lining Process can also be used on new steel pipe, after installation. This process is widely used by the waterworks, electric power, oil, and gas industries, and in manufacturing facilities. The process provides a continuous, smooth, dense lining after all pipe handling and construction is complete. There's no damage to the lining, less weight to handle during installation and no costly repair or makeup work. Of course, pipe can also be lined before it is installed, if that is your preference.

Also available is the Reinforced SpinCo. CML Lining Process, in which the cement-mortar lining encases a helically applied steel reinforcing rod. Rod size can range from 3/16 to 3/8 inches, spaced from 1/2 to 6 inches apart. This process has been used in deteriorated cast iron, steel, corrugated metal, and concrete pipelines, as well as brick conduit.

Structural rehabilitation for pressure pipe for pipe sizes 30 inch in diameter and larger can be accomplished by the construction of a Reinforced Cement Mortar Lining.  This type of rehabilitation has been successfully used in pressure systems with test pressures as high as 400 psi.  Reinforced cement mortar lining is typically used on deteriorated large diameter water mains, however, it has been used on large diameter sewer force mains with a modification in the cement to type five – sulfate resistant cement.

Reinforced Cement Mortar Lining consists of a built up “reinforced concrete liner” that acts as a new pipe within the existing pipe, that is structurally capable of withstanding  compressive design loads as well as internal pipe pressures.  The liner pipe is sized to withstand external loads based on AASHTO’s (American Association of State Highway and Transportation Officials) two passing truck design criteria.  Internal pressures are analyzed with the Barlow formula in order to determine the cross sectional area of steel reinforcement necessary to meet the design criteria.  Reinforcement is typically selected at diameters less than one half inch and spaced two inches on center circumferentially with longitudinal bars to support the circumferential “hoop” reinforcement typically at 6 to 8 inches on center.  Additional courses of cement mortar and reinforcement are added when pressures require larger cross sectional areas of reinforcement.  The final reinforced cement mortar lining is comprised of several layers of cement mortar lining and reinforcement based on design requirements.  The cement mortar is centrifugally applied by machine to the inside of the pipe in layers up to 5/8 inches in thickness.  The mortar is fed to the lining machine spray head at a controlled rate determined by the required lining thickness.  The rearwards movement of the machine is powered by an integral power unit and controlled by an operator within the main.  The lining machine is equipped with a series of tensioned rotating trowels to finish the lining.  Sandwiched between the layers of cement mortar are the layers of steel reinforcement.  The reinforcement is sized outside of the main, and custom rolled in seven foot lengths to fit the inside diameter of the pipeline.  These rolls, typically called cages, are then placed on buggies and slid into place inside the water main and secured in place. Reinforcement is then followed by a minimum of two additional passes of 5/8 inch troweled cement mortar lining to complete a reinforced liner capable of conveying fluids with minimal head losses due to the very high C-factor that is achieved in this process.    

The product can be tested above ground, when specified, using a test steel pipe section of a similar diameter, rehabilitated with the design reinforcement and cement mortar lining.  The test is typically performed on a bulk-headed steel pipe section with a removable half cap section at the mid point.  The half cap section is removed after the liner has properly cured, and before the liner is pressurized through a tap in one of the bulkheads. 

This reinforced cement mortar lining rehabilitation process has proven to be a reliable, cost effective alternative to replacement, and a solution to the on going maintenance of our aging pipeline infrastructure.