THE MAGAZINE FOR THE DRAINAGE, WATER & WASTEWATER INDUSTRIES
CASE STUDIES
water drain pipes of 375 mm i.d. were rehabilitated. Two pipes were 42 m long, and the third was 72 m long. Each was lined with 270 mm o.d. Flexi-Sliplining pipe which was supplied in in 6 m long sticks.
In this instance the pipe for the lining work was supplied by RSM. In a display of customer service, when a tool broke late on the first afternoon, RSM had a replacement tool on site with the installation crew by 7 a.m. the following morning. According to Dawn Greig, Senior Director with Picote: “This was really was exceptional service and allowed the site crew to continue the works uninterrupted. The Picote Technical Team stayed on site with PSS to complete the job. Whilst there were several unexpected challenges on the project, the combined team used their expertise to overcome the difficulties to succeed in a job which was originally considered to be potentially unviable.”
The start date for the works was 18 September, with the final installation being completed and the site cleared by 20 September, a total of just 3 days on site. Production, once the liner pipes were welded to the required lengths and moved into the towing position, was impressive with each of the 42 m pulls taking approximately 25 minutes to complete and the 72 m pull took just 40 minutes.
PSS, utilising a design consultant, selected a specialist flowable mortar with appropriate strength to grout the annulus between the Picote pipe and the host pipe to ensure long term structural stability.
For PSS, Steve Tierney, Delivery Manager stated: “This has been a challenging job from the very outset including the pipe layout, site conditions and the number of stakeholders involved. We worked hard to source a suitable ‘best for task’ method and worked closely with Picote to complete an innovative No-Dig project using new technology.”
The liner pipe laid out ready for installation
Commenting on the project Dawn Greig, Senior Director with Picote said: “Public Sewer Services was one of Picote’s first customers when the company started in the UK back in 2012. We were therefore delighted that the company chose to utilise our Flexi-Sliplining system for this challenging project, which was not only one of our first in the UK but also the largest diameter here to date. We truly appreciate their continued support. We would like to thank their excellent team for this opportunity and hope to work with them on future trenchless projects.”
Preparing the liner pipe
Positioning the the liner pipe ready to install
FOLLOW US December 2023 | 25
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