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    Beaulieu, United Kingdom

    Picote Flexi-Sliplining System

    Trenchless Repair
    Location:
    Beaulieu, UK
    Date:

    April 2024

    Time frame:
    3 days
    Pipe:

    2x 80m severely corroded pipes running under a river

    Work:

    Picote Flexi-Sliplining System

    Pipe:

    DN140 (4") 2 lengths totalling 160m

    Background

    An urgent pipe repair was needed! The pipes run under the Beaulieu River and were severely corroded. There was also a major issue with tidal ingress. 

    The works involved full length Flexi-Sliplining of two DN225 CI pipes, side by side, that run underneath the river. The total length of the works was 160 metres over two separate lengths.
    The original pipe had multiple infiltration locations, was badly corroded and was in a fragile condition along most of its length. The river at the site location is also tidal.
    The chambers are over 4m in depth on either side of the river with narrow access on the downstream side. The upstream side had plenty of space to set up the site for welding.

    Various methods of repair were considered, including:
    •Full length CIPP using Ultra Violet light cure
    •Hot cure lining using either hot water or steam
    •LED light curing liner methods
    •Spray coating
    •Ambient curing liner
    All were considered but discounted due to the risk of contamination to the river.
    Spray lining methods were discounted due to the difficulty of getting the pipe dry before coating.

    Project Details

    Traditional sliplining requires access pits, large winching or pushing equipment, expensive pipe welding equipment, and additional labour and plant on site. Picote Solutions UK Ltd have previously carried out Flexi-Sliplining on various projects so this alternative was presented. After discussing the works with Clean Island and Cappagh Browne Utilities Ltd the consensus was to use the Picote Flexi-Sliplining method. The Picote Flexi-Sliplining method does not require any excavation. Having a small portable Welding Rig, lightweight materials and being very flexible, meant that all the works could be carried out from the existing chambers and utilising the ground space on site.

    The host pipe was inspected and various dollies pulled through to determine the most suitable size of pipe for installation. The largest dolly pulled through the pipe was DN160. It was determined that the 140 mm (outside diameter) and 123 mm (inside diameter) would be the best fit.
    Pipes were supplied in 6 metre lengths, a total of 30 lengths were welded on site.

    The small welding equipment with pipe clamps, joining frame and cutting tool were all aluminium, so made it extremely easy to use.
    Both lengths of pipe were welded on site, with each weld taking approximately 10 minutes to complete, in total the welding of both full lengths took around 9 hours to complete including set up, cutting, cleaning, and welding.

    Once the front of the pipe reached the downstream chamber, the pipe was allowed to rest for 20 minutes allowing any tension in the pipe to naturally reduce.

    The second downstream section was pulled into place in the same manner as the first.
    All the pipes were secured into the existing chambers using a patch liner and all works were completed within 2 days on site.

    BEAULIEU PICOTE FLEXI SLIPLINING CASE STUDY

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    The Picote Flexi-Sliplining Method

    The Picote Flexi-Sliplining method does not require any excavation. It uses a small portable welding rig, lightweight materials and the pipe is very flexible so that all works could be carried out from the existing chambers and ground space on site. 

    This is a stand-alone pipe SN4 or SN8 - a new pipe for 50 years.

    - HPWJ tested to 180 bar by WRc (In accordance with WIS 4-35-01 2008 appendix B)

    This particular repair would not have otherwise been possible without very expensive excavations because the pipe runs under a river. 

     

    TRIM
    WhatsApp Image 2024-04-24 at 16.08.35_446e9568

    The area of grass alongside the river was ideal for assembling the pipe. The local donkeys were curious but fortunately were not affected by the work. The welding rig was set up and powered by a small generator, rollers were placed at various locations to aid the process of pulling the pipe as it grew. The small welding equipment with pipe clamps, joining frame and cutting tool were all lightweight and extremely easy to use. Both lengths of pipe were welded in a single shift with each weld taking approx. 10 minutes to complete. In total the welding of both full lengths took just one day. 

    The pulling head was secured into the start of the pipe and the winch rope attached. The pipe was guided over the frame and through the pipe guide in the base of the chamber. A small battery-powered capstan winch was used to pull the pipe into place. The pulling process was carried out at a rate of approx. 8m per minute. Once the pipe was on its way there were no other additional works 
    required as the pipe fed itself over the rollers and into the host pipe. 

    WhatsApp Image 2024-04-24 at 16.08.35_615eee82
    If you would like to book a call with one of our team to discuss you own project, please use the contact form below and we will be in touch with you as soon as possible!
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    BEAULIEU PICOTE FLEXI SLIPLINING UK 2024

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