Condensate Tanks Foundation

SPGFD Phase 12, Condensate Storage Tanks Foundation

The Phase 12 refinery is the largest refinery in iran and produces 12554 gas daily. The gas and condensates extracted out of 45 wells are transferred to the onshore facilities at Tumbak region.

After being sweetened in the 6 gas processing rows, the sour gas is injected into the Iran National Gas Grid for domestic consumption. The condensates separated in the refinery section are stored in 4 mega storage tanks and then exported through sub-sea pipeline and SBM.

Construction work of the foundation of these tanks is awarded to vastapad company in May 2009 as an Construction Management Project. The Project Works consisted of earthworks, protecting layers

roadworks, piling, reinforced concrete & asphalt/sand mix topping.

As part of the bulk earthworks, McIlwain had to relocate approximately 80m of protective earthen bund walls and construct gravel access roads in and around the enclosure. Due to the weight of the tanks (≈15,000tonnes)and the poor ground conditions, it was necessary to install 200 pre-cast reinforced concrete piles up to a depth of 35m. The piles were then capped off with a 700-1000mm deep fully reinforced concrete pile cap. On top of the pile cap (and beneath the steel tank shell), a 50mm Asphalt/Sand mix was laid to meet the strict tolerance requirements of Shell; +/-3mm in any 10m. This was achieved on both the concrete and the asphalt/sand layer finishing surfaces.

Methodical project planning and continual interaction between site and office ensured this project finished well ahead of schedule.