Permiline

Protective Mechanism

The protective mechanism of cement lining stems from passivation at the steel-cement contact area due to increased pH, and the long-term reaction between cement and pozzolanic materials which results in self-healing of small cracks in the lining.

Laying

Pipelines are customarily deflected to follow terrain contours. No damage will occur to the lining provided the yield point of the steel is not exceeded. Because the cement lining has a coefficient of thermal expansion virtually identical to the steel tube, no consideration needs to be given to temperature changes.

Joints may be coupled by (1) welding – using a special gasket (2) the conventional T&C joint with PERMITEK joint compound (3) or the seal grooved type coupling. Field cuts can be made with either saws or cutting torches; rough lining ends should be repaired with our easily applied patching compound.

Handling

Care should be taken to prevent either denting or permanent distortion of the steel tube. Such damage can result from throwing lined pipe from trucks, allowing it to strike a hard object, or exceeding the legal overhang during transport. Hooks or other objects should not be inserted into the pipe ends.