Page 63 - Impiantistica industriale

Il vostro fornitore di

valvole dal 1953
Ringraziamenti
Gli autori ringraziano Trans Adriatic Pipeline AG.

Bibliografia
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Monitoring measurement system

of the TAP landing microtunnel
based on Bragg technology

This article describes the measurement system and methodology used for mo-
nitoring the structural integrity of the microtunnel (MT) that hosts the final section
of the Trans Adriatic Pipeline (TAP) on the Italian coast. TAP allows the transport
of natural gas from the Caspian Sea to South-Eastern and Western Europe. The
offshore part of the work, approximately 105 km long, plunges into the Adriatic
in Albania and lands in Italy on the coast of the Puglia region, in the municipality
of Melendugno (LE). The landing in Italy of the TAP gas pipeline is achieved
through microtunnelling technology, which allows the installation of the pipeline,
without the need to provide “open air” excavations, minimizing the impact with
the coastal territory. The MT, with a length of 1,540 m, an internal diameter of
2,400 mm and an external diameter of 3,000 mm, provided for the laying of the Oil & Gas Food & Pharma
pipeline by means of a pushing process: the excavation was carried out by me- Chemical General Industry
ans of a guided, remote-controlled milling shield, called Tunnel Boring Machine Power & Water
(TBM), which was pushed into the ground, followed by watertight segments in
prestressed concrete, subsequently joined to form a continuous tunnel, inside
which the gas pipeline was launched. The free gap between the pipeline and the
gas pipeline is flooded with sea water. In compliance with the maintenance plans
and the requirements of the Fire Brigade, the MT must be subjected to periodic
inspection to verify the structural integrity and the absence of obstructions in the
vent pipes. For this purpose, an innovative methodology was proposed, based
on monitoring the deformation measurements, obtained through the installation
of strain gauge stations along the MT of the TAP landing stage. These sensors
are written directly inside the fiber sensing cables of which the axial extension is
calculated, based on FBG (Fiber Bragg Grating) optical technology. The senso-
rized cables are suitably constrained on the internal surface of the MT, between
specific fixed points integral with the concrete segments. This article deals with AUDCO ITALIANA srl
the system architecture, the selection of materials, the installation procedure and Via Carlo dell’Acqua, 1- 20027 Rescaldina (MI) - Italy
measurement acquisition in detail. Tel. +39 0331 1561323 - Fax +39 0331 1561327 - info@audco.it - www.audco.it 59 59
Impiantistica Italiana - Luglio-Agosto 2022
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