Construction World October 2016

PROJECTS AND CONTRACTS

Scope for application of MULTIDISCIPLINARY CAPABILITIES By Chrissi Maria As a multidisciplinary construction partner to the oil & gas sector, Stefanutti Stocks offers a full-range of construction services including geotechnical, earthworks, civils, building, mechanical, process piping systems, electrical and instrumentation installations, as well as structural rehabilitation and concrete repair.

below eight metres deep required proper planning for drilling, pile-base cleaning and concrete pouring. In some of the piles, mainly in the backfilled areas, severe water ingress and associated side-wall collapses required the utilisation of temporary casings. This project had very tight milestones and required sections to be handed over in early January 2016, with heavy penalties as a result of not completing on time. “Our planning in terms of material procurement, mobilising to site and the execution of the works had to be very precise,” says project manager Teboho Motaung. “We put a sound strategy in place and completed the overall works and sectional hand overs two weeks ahead of schedule.” The specification required pile compres- sion load tests be done on three 750 mm- diameter piles carrying a working load of 2 765 kN. The piles were loaded to 1,5 x working load as per the testing specifica- tions. “The main purpose for conducting the pile compression load testing is to validate and to check compliance with the design specifications,” explains Motaung. “In order to allow the application of a load to the test pile for an extended period of time this method of testing involved the use of a reac- tion system, using a 500 ton jack to apply the required test load of 4 147 kN.” As pile-compression load testing is regarded as temporary works, the method and assembly of the tests were carried out in accordance with the require- ments of SANS1200F, British Standard and the South African Occupational Health and Safety (OHS) Act. Structural, mechanical, electrical, instrumentation and piping (SMEIP) Stefanutti Stocks Oil & Gas division is undertaking the Chlorotrifluoroethylene (CTFE) SMEIP contract for Sasol in Secunda. The contract for the fabrication of the piping spools, using free issue material, was also undertaken by the division. This was under- taken at the division’s pipe spool fabrica- tion facility in Elandsfontein (that includes a furnace for heat treatment). Once the blasting and painting completed delivered to site in Secunda. Process plant maintenance and construction E&I has been undertaking the electrical and

“We are able to put a compre- hensive skills-set to play for clients such as Sasol, for which the group’s divisions undertake

• Preliminary designs at the tender stage and further auger trial holes to verify the founding conditions. • Final construction design with piles carrying loads in side-shear only, including client’s minimum require- ments based on the auger trial holes information. • Installation of 516 temporary cased and uncased Auger-Cased In Situ (ACIS) structural piles, with diameters ranging between 450 mm to 750 mm. • Installation of three 750 mm-diameter compression-load test piles, with four anchor piles for each test. The production schedule was impacted by the discovery of an unforeseen hard rock layer of dolerite beneath 83% of the site footprint, which needed to be drilled through in order to achieve the minimum required rock sockets. Also, unexpected water seepage

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a broad spectrum of projects,” says Geoff Thompson, business development director for the Stefanutti Stocks Structures business unit. “These capabilities, coupled with our uncompromising policies on quality and safety, and solid client relationships, have made Stefanutti Stocks one of the preferred contractors within this industry.” Piling capabilities After successfully completing the piling for the Oxygen Train 16 th project in 2009, Stefanutti Stocks Geotechnical was awarded the piling works contract for what will be the worlds’ largest Oxygen production facility, the new Oxygen Train 17 th Plant. The scope of works on this contract included:

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Stefanutti Stocks Geotechnical's piling rigs that were used at the Sasol Train 17th Plant site.

CONSTRUCTION WORLD OCTOBER 2016