A unique project with the iMPREGLiner

Rehabilitation by CIPP liners of a sewer line through the Liseberg amusement park

iMPREG GmbH and their client Avloppsrallarna worked together to deliver this very technical and challenging project on the Sustainable Waste and Water department of the City of Gothenburg. Together we lined 1,120 metres of a DN 1500 mm combination sewer line stretching partly through Liseberg amusement park. Project engineer Antje Koppen from Gothenburg Sustainable Waste and Water commented ‘It was a difficult and unique project for both of us, we learned a great deal during the procurement process and implementation of the project.’ iMPREG Projekt Freizeitpark Liseberg Avloppsrallarna

The history behind the project is that Gothenburg have been experiencing high volumes of groundwater ingress in its sewer lines, so consequently is actively working to remove the leakage problem. The ten-year mean value for groundwater ingress in Gothenburg is 57 % and the current mean value in the action plan is 50 %.

The current section of the project is within the Kodammarna pump station drainage basin where roughly one-fourth of the waste water from Gothenburg is pumped to the Ryaverket purification plant. The main flow is approximately one cubic metre per second. The combination sewer line stretches along and below the level of Mölndalsån. When flow measurements were taken in 2014 it was determined that there is a great deal of infiltration leakage in this area. The stretch of sewer line along Nellickevägen was chosen for close examination because its proven that infiltration leakage was at its worst along this section of sewer. The current sewer lines were installed during the 1940s, after cctv examination it shows the concrete sewers to be partially deteriorated. The estimated leakage into the sewer line was around 120 litres per second.

During the project iMPREG and Avloppsrallarna installed 1,120 metres of DN 1500mm iMPREG fibreglass-reinforced liners that was cured with UV light. The wall thickness was 17.6mm to 18.5mm and it weighed approximately 15 tons per 100 metres. At the same time, 15 manholes were flushed and sealed by injection.

Trenchless technology

The project was carried out by Avloppsrallarna from April to mid-June. The project was implemented as a second competition based on the framework agreement called Flexibelt Foder [Flexible Lining]. iMPREG Projekt Göteborg Avloppsrallarna

‘We chose the no-dig solution because it meant limited interference in the area. The contractor only needed to dig up two manholes. Ten excavations were done in our project and at that point the contractor was already battling inward leakage from the nearby river.’

In order to have full flexibility during the implementation, it was also necessary that the uncured liner material could remain intact for at least a month before it was installed and cured.

‘Part of the sewer line went through Liseberg amusement park and it was important that the contractor was there as little as possible. It was also a requirement that the work was carried out when the park was closed, and no events or renovation were in progress.’

Four procurement processes

At the start of the project, part of the section of sewer line was selected for cleaning and film application during the autumn of 2015. The project planning and procurement processes took place from 2016 to 2018 and four procurement processes were required in order to implement the overall project. As a result, the project was postponed a year due to budget and re-prioritisation. The last procurement process concluded with the signing of a contract at the beginning of December 2018 by Avloppsrallarna.

‘The contractor planned and organised implementation in the beginning of 2019. The plugging of the sewer line and pump installation took place in the beginning of April with the final inspection was carried out on 17th June.’

The total contract amount was 13.9 million kronor (1,32 Mio. €).

West Link added

‘We ordered an additional 95-metre section during the period, which is part of the 1,120 metres. This took place in connection with the renovation of the sewer line before the West Link at Örgrytemotet for 1.7 million kronor (162 Tsd. €). The flushing and cleaning of the line was much more complicated than we anticipated and it was merely an item listed in the tender. There was also considerably more inward leakage in the line and manholes than we had measured and estimated in 2015.’ iMPREG Projekt Liseberg Avloppsrallarna sewer

The project total to date is 16.7 million kronor (1,59 Mio. €), but that figure is likely to rise nearer the end of the project.

Antje Koppen commented ‘It was a difficult and unique project for both us and a great deal was learnt during the procurement process and implementation of the project. We are very pleased with outcome and how the project was ultimately executed.’

Good collaboration

‘The project required a great deal of coordination and good collaboration between our operations unit. Liseberg and the contractor considers it as a great success. The contractor also had to factor in a construction site for Peab’s new offices. The site was in operation during the project period and additional coordination was necessary to gain access to their work area. We tried to involve all parties at an early stage in the project planning in order to be able to execute the project as smoothly as possible.’

Test samples have been taken and sent to RISE for examination of three-point flexural bending, short time testing and residual styrene content.

‘We have not received all of the results yet, but the results for two sections have been approved.’

Text and photos: with permission of Avloppsrallarna AB
Read the original text here: www.sstt.se

Extension of DIBt approval for our iMRPEGLiner

iMPREG GmbH DIBt Z-42.3-365 extensionDeutsches Institut für Bautechnik (DIBt) ensures with its approvals and assessments the safety of construction works while fostering the development of innovative construction products and techniques. We are very happy that the DIBt approval for our iMPREGLiner has been extended.
This confirms the quality of our product and our work.
The extension of the DIBt is available for download on our homepage: /downloads/

iMPREG makes history

iMPREG U.S. Makes History with the First 72” Liner!

impreg usa liner dn 1800 pipe impreg usa liner dn 1800 construction

iMPREG Group is proud to announce that iMPREG LLC made history on November 2nd ,  as the first company in the world to install a 72” UV CIPP liner!
Arold Construction out of Kingston, NY installed the 72” liner.  The weather was very unpredictable, having to schedule around Hurricane Florence and the liners arriving late, but iMPREG and Arold were able to get the liners in the ground when there was a break in the rain, with absolutely no problems! The liner cured in a little under 3 hours!

Congratulations to iMPREG U.S. and Arold Construction!

impreg usa liner dn 1800impreg usa liner dn 1800 result

Helfpul donation

iMPREG spendet an Förderverein für krebskranke Kinder Tübingen e.V.

iMPREG GmbH donates to the Förderverein für krebskranke Kinder Tübingen e.V.

Right on ones doorstep there is a great aid association, the Förderverein für krebskranke Kinder Tübingen e.V.
We supported Förderverein für krebskranke Kinder Tübingen e.V. at the campaign „Donate instead of gifts – get involved, where help arrives directly!!“ and donated 4.000 EUR!
Katrin (middle, Head of sales) and Nicole (right, Marketing) visited the institution in Tübingen and handed over a donation check to Merle Klose (left, executive assistant) from the Förderverein.
Thanks for the nice conversation and the insights into your association. Further informations: www.krebskranke-kinder-tuebingen.de

Prism AutumnFest 2018

Successful demonstration of a UV Curing Demo

Our North American Office, iMPREG LLC recently had the chance to perform a UV Curing Demo at AutumnFest, hosted yearly by Prism Contractors and Engineers in Williamsburg, Virginia on September 19th, to over 200 people.

Prism focuses on civil engineering, contracting, training, inspection services, trenchless rehabilitation in the construction industry. Our North American lead Application Engineer; Patrick performed a demo curing in the yard and our Lead Civil Engineer & Vice President Christoph Lindner shared about GRP UV CIPP technology and the benefits of this technology for local Contractors and Municipalities. Christoph had the opportunity to answer many questions for the conference attendees, as well as serve on the CIPP panel discussion during the conference.

Blogbeitrag_impreg-llc_Christoph is speaking Prism Autumn Fest Blogbeitrag_impreg-llc_Christoph Speaking Prism Autumn Fest

This was an exciting opportunity for iMPREG LLC, as it begins to open itself to the U.S. market, and specifically the mid-Atlantic region, where the AutumnFest conference was held.

iMPREG LLC will be holding the Grand Opening of their North American Headquarters in the beginning of 2019, of a 40,000 square foot facility, where they will be producing 6”-72” liners”!

Successful IFAT 2018 in Munich

IFAT 2018: Great Booth. Happy visitors. Amazing iMPREG-Team.


With these words we can summarise IFAT 2018 in Munich. More than 141,000 trade visitors from over 160 countries attended IFAT, the world’s largest environmental technology trade fair (source: www. ifat. de). And we were there! International was not only the audience but also our team. All our iMPREG locations were represented by our colleagues from China, the USA, England and Australia.

Our booth 226 in hall C3 was an eye-catcher. The exhibits of our long-standing partners IMS Robotics, Streicher, ProKasro, IBG HydroTech und I.S.T. gave our stand that special touch. In particular, the luminous core of the Streicher company was a magnet for visitors.
The highlight was the presentation of our iMPREGLiner GL16 DN 1800, which was integrated into a wall and illuminated. There was also a lottery: Post & win. The winners were drawn.

With snacks and drinks, our visitors enjoyed their time at our large stand. Sufficient seating and an integrated lounge offered space for interesting discussions. Our many give-aways such as the iMPREG truck with Mentos filling, ballpoint pens, lighters and much more were also in demand. All in all it was a successful and amazing fair, with great teamwork.

The next IFAT will take place from 4 to 8 May 2020 at the Munich Exhibition Centre.
We are already looking forward to it.

New DiBT approval for iMPREG-Liner GL16

Constant development pays off: we are proud to announce that the new DiBT approval (National technical approval for construction products and construction types) has certified a long-term E-module E50 of 13,000 N/mm² (before: 12,630 N/mm²) and a long-term flexural strength σ50 of 204 N/mm² (before: 200 N/mm²) for our iMPREG Liner GL16. Further, the reduction factor A1 is now 1.2.
Please access this link to download our latest DiBT (German version): www.impreg.de/de/downloads

Officially approved by the WRc

WRc_ApprovalWe are proud to announce that our new UV liner, the iMPREG liner GL16, has been officially approved by the WRc!
Further, the existing approval of our iMPREG liners GL01 and GL13 has been extended!
You can find the certificate www.impreg.com/downloads.

Rehabilitation of a canal with UV Lining means the least impact on the infrastructure

“Holidays with the iMPREG Liner”
Our customer Hidrotec proofs this where other people went on holiday: 70 meters of canal were renovated in a Spanish holiday resort in Calafell on the Mediterranean, without having to carry out major construction work on site. The plant operators and their guests benefited from the UV-based rehabilitation process through our iMPREG liner: the action was carried out quickly and cleanly.
After all, who wants to be bothered on vacation with construction noise and pollution?

Good work, Hidrotec!

The iMPREG -liner in Andalusia

The iMPREG -liner in Andalusia

In front of the historical scenery of Córdoba and Cáceres we have installed the first iMPREG liner with our new customer Magtel.

In spite of three inaccessible intermediate manholes and tight installation spaces, Magtel has successfully installed an iMPREG liner GL01, DN 300, WD 5 mm, 44 m in Córdoba. Subsequently, he installed a GL01, DN 500, WD 4 mm, 65 m in a rainwater pipe in Cáceres.

Since these were the first installations of UV liners in Andalusia, they were closely followed by numerous engineering firms from Córdoba and the region as well as representatives from regional water authorities.

Congratulation to José María Gil Montaño and his team from Magtel!