“a project fore the revamping of a major oil facility in Thailand”

Design of bridges for exceptional loads within the Sriracha Refinery (Thailand)


Sriracha (Thailand)



Amount of works

> 50.000 €



Service provided

Detailed design of two bridges for exceptional loads


The Sriracha refinery in Chonburi is located on Thailand’s south-east coast. It is undergoing a revamping and upgrading process as part of the “Clean Fuel” project, which features the collaboration among Petrofac, SAIPEM, Samsung Engineering and Thai Oil (Thailand’s state-owned oil refining company) funded with $4 billion. At the end of the upgrade and improvement process currently ongoing (to be completed at the end of 2022), the existing refinery will be upgraded in all environmental aspects to produce sustainable and high quality oil products.

Within this context, NET’s client (SAIPEM) provides engineering, procurement, construction and start-up services for the new production units. On behalf of SAIPEM, NET Engineering took care of the detailed design of two single-span bridges intended for the transport of exceptional loads resulting from the handling of large prefabricated steel structures (KO Drum) during the construction phase of the refinery. In particular, the two crossing structures are the Temporary bridge along the Fire Break Route and the Culvert box crossing located inside the WBS/C area.

The vehicles used to move the structures under construction belong to the SPMT (Self-Propelled Modular Transporter) class, as they are composed of a long series of axles able to reduce the specific pressure on the ground under heavy loads (pressure that reaches 100 KN/m² in any case, with consequent high stresses on the approach embankments and especially on the crossing structures). The design included the study of the approach and manoeuvring paths required by multi-wheel vehicles to cross the bridges.

Within its scope of work, NET Engineering dealt with project management, concept design (only for the culvert box crossing), design of the abutments (geotechnical and structural) and of the approach embankments, including the retaining walls (Fire Break Route only), the study of the supports in resilient material, as well as the steel span structure prefabricated in modules, with final anti-wear and anti-slip coating.

Once the temporary function related to the site activities is over, the two bridges designed by NET will be used for the internal road network of the refinery under significantly lower loads.

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