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| FAQ's -Frequently Asked Questions |
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Cement Mortar Lining FAQ's
Cured In Place Piping FAQ's Cement Mortar Lining FAQ's / Answers Is there a CML process that is structural? CML itself is structural to a point. This was demonstrated in the Detroit Test which proved that CML can stop leaks ... lead into your video description of the Detroit test. For a fully structural replacement that can withstand load forces and internal pressures Reinforced CML can be used on water mains 30" diameter and larger. What are the economics of CML? CML typically costs less than 50% of replacement costs, and has a life span in access of 75 years. (as the diameter increases, the proportion of savings also increases dramatically) Yes, in-place CML has been performed since the early 1940's and all new ductile iron pipe comes with a CML from the factory. What is the difference between In-Place CML and Factory CML by way of quality? In place CML is superior to factory CML because it is made typically with a one to one ration of silica sand to cement which provides a very durable lining with compressive strengths in access of 7,500 psi. while factory linings are typically a 3 to one ratio. Further, in-place linings are under optimum curing conditions since water is typically introduced into the main about one day after the lining is applied. Further still, the in-place lining is applied centrifugally as opposed to the factory lining in which the pipe is spun so the factory process allows segregation of the cement mortar materials. Will the cement mortar lining have to be replaced after a period of time? The cement mortar lining should last for over 75 years without being replaced, and typically outlasts the life of the water main. The exception to this is large diameter lines that carry raw water at high velocities containing sand that may scower the invert lining. This is a rare case, but studies show that it is still dramatically more economical to repair the linings every 25 years in these cases then to replace the pipelines. Is CML a barrier to corrosion or is it a positive way to prevent corrosion? CML is a positive way to prevent corrosion on the interior surface of cast iron pipe once and for all. The CML maintains an alkali surface on the cast iron (or ductile iron) pipe that effectively prevents corrosion for as long as the lining remains in the pipeline. This is much better than "barrier to corrosion" or a coating system that works as a barrier and tries to prevent corrosion by keeping moisture from coming into contact with the pipe.
CIPP FAQ's / Answers Cured-In-Place-Pipe. CIPP liner is designed to be as strong as necessary. Each liner can be designed as a “stand alone pipe” to support the entire live load, dead load, and ground water pressure. What diameters has Spiniello lined? Spiniello has lined pipes ranging in size from 8” to 108”. What is done with the flow while lining the pipe? The flow must be removed from the line by diverting to another system or installing an above ground bypass pumping system. How long does it take to line a pipe? The duration of an installation varies by diameter, length, and thickness. Durations will range from 1 to 5 days. The liner is comprised of a non-woven needled felt saturated with a thermo setting resin. The resin is hardened by heating the water inside the liner. Is digging involved with CIPP? The only excavation that may be required is the opening of manholes to allow the insertion of a liner, larger than the existing manhole opening. Can CIPP be designed for corrosion resistance only? Liners can be designed for a “non-deteriorated condition”, i.e. non structural, which will provide corrosion resistance only. How is CIPP inserted into a line? The CIPP liners are inserted into the line through an existing manhole or access opening, turned inside out or “inverted” with water pressure developed by use of a water column in the downtube, extended to the termination manhole or opening, heated until the liner has cured, cooled, and the ends opened for the return of the flow. The CIPP liners are inserted into the line through an existing manhole or access opening, turned inside out or “inverted” with water pressure developed by use of a water column in the downtube, extended to the termination manhole or opening, heated until the liner has cured, cooled, and the ends opened for the return of the flow.
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