Cured-In-Place Lining (CIPP) — Ferro Monk Systems Limited
Cured-in-Place Lining
With the cured-in-place lining method, a new liner is introduced into the pipe or sewer, to help create a ‘pipe within a pipe’. The pipe is then ‘cured’, or finished, ready for use.
The methods for curing include a ‘hot cure’ method, using hot water or steam, and an ‘ambient’ technique, in which the lining cures at the local temperature. Ferro Monk Systems Limited have rehabilitated hundreds of kilometers of pipes and culverts using the cured-in-place lining method.
We take an independent approach and do not automatically favour one particular curing technique. The vast majority of our liners are installed using the ‘hot cure’ method, which has been proven over many years of use to produce a quality product. However, there are also occasions when an ambient cure method is appropriate, and we advise our clients accordingly.
Most of our liners are designed, manufactured and installed to WIS 04-34-04. Cured-in-Place linings are regarded as being a Type II system as defined by the Sewer Rehabilitation Manual.
Our experience includes installations in some very unusual, awkward and remote situations, so we are very confident that we can meet your requirements. Please contact us to discuss your needs.
We maintain close links with our resin manufacturers and can offer solutions to cope with aggressive effluents that may be found on food, drink and chemical process plants. So, whatever the circumstances, we are confident that we can help.
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How is Cured-in-Place Lining carried out?
The sequence of operations is typically:-
Assessment of Initial Information.
We will look at the characteristics of the site and of the existing pipe – often known as the host pipe. These factors will impact upon the design of the liner that we use, and will determine the approach to installation.
In every situation, we help clients to consider a range of options. We do not install just Cured in Place Liners, so we can look at a whole range of possible alternative methods which may include isolated patching or other insitu systems.
Pre Lining CCTV Survey.
We survey the host pipe using specialist remotely controlled CCTV equipment. This thorough survey includes an examination of the condition of the pipe. We carefully note any unusual observations or characteristics, and record the size and position of any incoming lateral connections. Clients tell us that they value this survey as it helps provide a complete picture of their pipe assets.
Pre Cleaning.
Pre cleaning is often undertaken in conjunction with CCTV monitoring. The host pipe is cleaned of silt and debris using high pressure water jetting, and the waste is removed by an integral vacuum tanker. We are registered Waste Carriers with the Environment Agency and we ensure that any sub-contactors are similarly accredited.
Sometimes pipes will require the use of more specialised equipment, for the removal of hard encrustation and roots. We have a number of techniques available to us, including the use of ultra high pressure water jetting, winching, chain flailing and remote mechanical apparatus.
Liner Manufacture
A new liner effectively creates a new pipe inside an old pipe. Our clients need to be confident about the quality of our liners, and they are manufactured to exacting standards.
We work closely with one of the worlds leading manufacturers of felt liners, known as socks. These are made-to-measure for each length of pipe that requires renovation. The socks are manufactured and tested in accordance with the exacting standards of ISO 9002.
Socks are delivered to our main operations centre where resins and other ingredients are mixed and impregnated into the felt. This process is carried out under monitored factory conditions, to further ensure the quality of our product.
Installation
We deliver the liners to our clients’ sites using our own fleet of vehicles and trailers.
A temporary working platform is set up, together with pumping equipment. The liner is turned inside out, or inverted, and introduced into the pipe, by using water (or air in some cases), which ensures that the liner fits closely against the shape of the existing pipe and maintains its designed thickness.
Our installation process means that we can successfully line various shaped pipes, including circular, oval, egg and square profiles.
Normal circular, ovals or egg shapes are easily accommodated and we can offer advice on the use of this technique in other shapes, such as ‘U’ shaped, triangular or square.
For ‘hot cure’ installations, we then need to use heat to make the liner an effective pipe. Following inversion, the water inside the liner is heated and circulated using one or more of our mobile boiler units. The increase in temperature causes a heat producing - or exothermic - reaction within the resin mix, which results in the curing of the liner. Sometimes we use steam instead of hot water to achieve the same result.
Following curing, the water is allowed to cool and the curing water is then either released into the sewer (where this is permitted) or removed, in complete compliance with licensed disposal regulations.
The ends of the liner are then cut neatly at each end of the pipe usingspecialist cutting equipment.
Lateral Re-opening
During the CCTV inspection we agree with clients which lateral connections will be required after the re-line. We use a remotely controlled robotic cutter, monitored by CCTV, to achieve the lateral re-openings.
Post Lining CCTV Survey
The completed installation is then re-surveyed by remote CCTV. The Pre and Post Lining surveys are then made available to the client for their records, in a choice of formats – CD, DVD or Video.
All our processes are carried out in accordance with our documented and audited Quality Assurance System to 9001 standard.
