The problem was that some 5 years ago pipeline survey works highlighted that ground movement has caused deterioration and cracking in sewers the vicinity of the cathedral, with the situation being carefully monitored by DALROD since. A more recent survey indicated that the sewers were now in need of relining, which is normally a straightforward procedure for the DALROD team. However, in this instance, one particular 225 mm (9 in) diameter sewer system, which was approximately 2.8 to 3.0 metres deep, had particularly difficult access problems. The access was tricky for various reasons including that the pipeline runs below a terrace of pre-war-built houses with no rodable access points from most of the lateral connections as well as poor access to most of the gardens of each individual property which made it difficult to reopen the lateral connections subsequent to the main line lining work. In addition to the access difficulties, most of the properties comprised 3-storey buildings that had live systems which could not be shut down adding to the general operational difficulties. All of this meant that Dal Rod had to reline the sewers whilst the system was live and over-pump where flows required it to make sure that no flooding occurred in the basements of any of the 3-storey buildings during the works. This was clearly a case for a trenchless lining or 'no-dig' solution. Having examined the options it was decided that Brawoliner was best suited to the work, a system which the DALROD team had previously utilised on similar jobs.
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The smallest BRAWOLINER® to date. For in-house rehabilitation In the past, defective flush-mounted small diameter pipes had to be repaired in open cut replacement. BRAWOLINER® is proud to announce a special liner for the rehabilitation of DN 50 sanitary pipes; for example from the shower to the wash basin, drain pipelines in the kitchen or industrial areas can now be rehabilitated easily with BRAWOLINER® DN 50. The seamless liner has the same product characteristics as the proven BRAWOLINER. It can be installed with a minimum pressure and up to 90 ° bends. As usual, the installation takes place with the inversion drum and an additional reduction nozzle.
Since 2004 Bell Services Ltd, the Dyno Rod franchise holder for the Channel Island of Jersey, has been using the German-manufactured Brawoliner® system, from KOB (Karl Otto Braun KG) of Wolfstein, for the lining of deteriorated pitch fibre and vitrified clayware foul and surface water pipes across the island. Some 2,000 m of Brawoliner® has been installed over the last 3 years in either 100 mm (4”) diameter, 150 mm (6”) diameter, with some 200 mm (9”) diameter installations. Clients have included The States of Jersey Public Services, Education Sport & Culture (local schools), Health & Social Services (General Hospital) and Housing Departments as well as Public Houses and Residential Homes and numerous properties across the island. The work has been undertaken in close association with CJ Kelly Associated Ltd, an independent specialist sewer renovation consultant and KOB’s technical representative the UK and Éire.