Client: BONATTI J&P AVAX S.r.l.
Project: Trans Adriatic Pipeline (Shareholders: BP 20%, SOCAR 20%, Snam S.p.A. 20%, Fluxys 19%, Enagás 16% and Axpo 5%).
Date: November 2017 – April 2018
Location: TAP consists of a pipeline running through Greece (550 km), Albania (215 km), Adriatic Sea (105 km), Italy (8 km) – TDCI worked on a segment of the pipeline in Greece near the border to Albania
Transported Medium: Natural gas pipeline
Pipe size: DN 1200
Total length coated: 1.1 km
Total number of pipes coated: 64 pipes
Total number of welding seams: 65 welding seams
TDCI was hired by BONATTI J&P AVAX S.r.l. (a joint venture between the pipeline contractor Bonatti and the Greek construction company J&P Avax that was appointed for the Greek segment of the TAP project) as a subcontractor for the application of 7mm pau wrap® on 3LPE coated steel pipes 48” (DN1200) for sections 2 and 3, including the Aliakmonas river crossing.
Difficulties with the terrain while on-site lead to the selection of pau wrap® GRP. Originally a normal HDD process was planned for the 2 crossings of the Aliakmonas River although the inability of the terrain to keep the pilot borehole open resulted in the process changing to a Direct Pipe® system. This installation also implied further abrasion stresses with the terrain and thus the requirement for GRP.
To avoid damages during drilling operations, both pipes and field joints were coated with TDCI’s 7mm GRP, forming an integrated pau wrap® system for the whole segment of the pipeline for the two crossings. Pipe coatings were done in TDCI’s factory in Trollenhagen, Germany and then were transported to Greece via rail. TDCI had a total turnaround time of 2.5 weeks from the initial arrival of the pipes at the factory’s nearby rail station to the departure of the unit train to Greece. The field joint coating was applied on-site by TDCI’s experienced team at the same thickness as the pipe coating and on a Protegol polyurethane-based corrosion protection.
Environmental temperature conditions ranged from -8°C to 20°C throughout the duration of TDCI’s participation in the project. A fluctuation of 15°C on certain days was not unusual. TDCI’s experienced jobsite team dealt with the weather conditions without causing any delays or quality issues during the application. pau wrap® curing process doesn’t require any kind of UV source during field joint operations. Hence, homogeneity and quality of the final product applied at site were equivalent to the factory applied coating.
The project was completed successfully with the TDCI coating in April 2018 and passed all technical tests – the pipes evidenced no damages from the hard rock environment.