The CuraFlo Spincast System uses specialized equipment and processes to dry, clean and then line large diameter pipes.
Step 1: Access the pipe.
The first step in the pipe rehabilitation process is to locate the pipes that need repair. These pipes are often underground, but may be located by using a combination of the following:
- Underground locating equipment
- Above ground fittings (e.g. valves, fire hydrants)
- Building drawings
Step 2: Isolate the pipe.
Water to the pipes must be shut off in order to start the rehabilitation process. This is done by closing the appropriate isolating valves within the pipe system. This will only affect the pipes in the system identified for rehabilitation, while maintaining the water supply to other, non-affected piping systems. Some pipe rehabilitation projects require the use of an above ground bypass system to supply potable water to each consumer. If this is required, the team will work to secure the approval of the local fire department to ensure adequate fire protection.
Step 3: Clean the pipe.
Pipe sections or fittings are removed from each access point to allow the equipment into the pipe. The pipe can then be cleaned in preparation for the epoxy lining. The most common methods of cleaning in-place pipes are power boring, and drag scraping. There are several other methods of cleaning a pipe's interior surface, including sand blasting, pigging, high pressure jetting, pressure scraping, wire brushing and chemical cleaning. Depending on circumstances, many different techniques may be required to attain sound clean surfaces sufficient to promote long term bonding to the epoxy.
Step 4: Pre-lining inspection.
Closed circuit television (CCTV) inspection is conducted to verify cleanliness and identify any potential problems remaining in the pipe. If the CCTV inspection does not indicate any problems, the lining process can begin.
Step 5: Spincast lining.
A specialized rig is used to apply the epoxy pipe lining. A plural-component hose is pulled from the rig through the pipe to be lined. Once the hose reaches the end of the pipe, the epoxy application spray head is attached. The rig is then turned on and the epoxy is centrifugally cast through the spray head as the hose is winched back through the pipe. Computerized metering and mixing equipment on the rig allow for precise control of the thickness of the epoxy pipe lining. The pipe is inspected at both ends and then sealed to allow the lining to cure.
Step 6: Post-lining inspection
Following the required cure time for the applied lining, the coating must again be inspected using the CCTV system. This step ensures that the epoxy has been completely and consistently applied, and that the pipe is fully lined and protected.
Step 7: Disinfect the pipe
As a final safety step, the pipe is chlorinated to remove any possible impurities.
Step 8: Reconnect the pipe
The pipe work is now flushed, reconnected and returned to service.