Motus Group gets their down pipes relined

Edited by Benjamin Brits

As a result of leaking downpipes, the building structure was experiencing continual water damage that needed urgent attention.

CCTV inspection equipment is vital for the pipe relining process and is the team’s ‘eyes’ in the pipe, ensuring that the correct decisions are made. CCTV inspection equipment is vital for the pipe relining process and is the team’s ‘eyes’ in the pipe, ensuring that the correct decisions are made.

CCTV inspection equipment is vital for the pipe relining process and is the team’s ‘eyes’ in the pipe, ensuring that the correct decisions are made. CCTV inspection equipment is vital for the pipe relining process and is the team’s ‘eyes’ in the pipe, ensuring that the correct decisions are made.

Initially, a CCTV camera inspection was requested on all the building’s downpipes, as the customer was continuously experiencing costly damage every time it rained. Typically, as with many other circumstances, it is often not possible to replace pipes, and retrofit installation may not be practical or is a costly solution.Initially, a CCTV camera inspection was requested on all the building’s downpipes, as the customer was continuously experiencing costly damage every time it rained. Typically, as with many other circumstances, it is often not possible to replace pipes, and retrofit installation may not be practical or is a costly solution.

The inspection revealed that the downpipes, which are built into the walls, were dilapidated and that one downpipe was completely blocked. Water could not possibly drain from the pipe at all. 

Another downpipe had a displaced joint with a large gap the entire way around the pipe. The stormwater was essentially running into the brick wall and had already eroded a significant cavity, so, every time it rained, water would enter through the brick wall below the downpipe outlet.

The blocked pipe had a piece of wood lodged in it as well as a two-metre length of conduit. How these got there, no one can say, but it would be a good choice for our Wall of Shame. No one should underestimate the unintentional damage that can occur with situations such as these. A two-metre piece of anything doesn’t land up in a downpipe by accident, nor a piece of wood that can block an entire pipe.

Using a Renssi RCM cleaning machine with a cutting head, Nu Flow technicians cut through the piece of wood and accumulated blockage, working from the bottom of the downpipe upwards. Once the main blockage was opened and the conduit loosened, they then hooked the conduit pipe from the top with a drain machine and pulled it out, discovering that it was two metres long.

They relined the pipe with the shifted joint with a Nu Flow structural liner to create a new seamless pipe within the leaking host pipe. The pipe was a 75mm galvanised pipe with two 90-degree bends at the top of the pipe and one at the bottom.

 The technician pressure testing the liner prior to wet-out.

The technician pressure testing the liner prior to wet-out.

The process of pipe relining

Step One: CCTV pipe inspection

CCTV pipe inspection cameras are used throughout the entire pipe relining process. The camera is a lining technician’s eyes in the pipe and without it, the process could not be done properly. Nu Flow installers use a pipe inspection camera for the initial survey of the pipeline to determine the full scope of works required. A camera is used before and after cleaning the pipe in preparation for relining to ensure the pipe is thoroughly cleaned.

Other reasons for using a camera during the process, are to measure the pipe length, pipe diameter, and the exact position of junctions and bends, and to ensure that while liners are being inserted into the pipe and pulled into the correct position, that they are placed correctly, especially when the pipe line has junctions and tees. Finally, the camera is used for the post-lining survey to check that the liner has successfully been installed prior to the job been signed off.

Building a structural liner according to the pipe.

Building a structural liner according to the pipe.

Step Two: Pipe cleaning

It is imperative that pipes are thoroughly cleaned beyond normal cleaning standards, prior to pipe relining. If a pipe is not properly cleaned, the liner will not bond to the host pipe and it could allow fluid between the liner and the host pipe, through the dirt not having been removed, and it could then still leak.

Pipe relining also takes the shape of the host pipe, so scale build-up, dirt in the belly of the pipe, or bumps not removed will be lined over, leaving those bumps and abnormalities in the pipe’s profile forever. It is for this reason that Nu Flow installers prefer to do their own pipe cleaning, as opposed to allowing the client to have the pipes cleaned themselves prior to lining.

Nu Flow teams also have pipe cleaning equipment that cleans pipes to a far higher standard than what the average contractor does. This is especially true on cast iron pipes with scale build-up, where traditional cleaning methods unblock the pipe, but it does not return the pipe’s inner surface to bare metal again.

Step Three: Pipe reliningOnce the pipe has been camera-inspected, cleaned, and camera-inspected again, the technicians are ready to reline! The roll of liner is cut to the correct length, prepared for installation, impregnated with Nu Flow’s two-part 100% solid epoxy resin, and pushed (or pushed and pulled) into the pipe, carefully positioned to cover the problem area.

Once in position, the bladder inside the liner is inflated to push the epoxy-saturated liner against the interior walls of the pipe. The bladder is left inflated until the epoxy has cured, after which the bladder is removed, leaving behind a ‘nu pipe’ within the old deteriorated pipe. 

 


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