The limiting conditions of tank construction like safety regulations, lo-gistical challenges and an ongoing pro-duction require individual foundation and remediation solutions and an ex-pert knowledge for the design and exe-cution of construction works.

Highly sensitive technology of tanks,

strict Health & Safety regulations and limited space conditions require an excellent H&S-standard and best-trained staff.

Special conditions

The Keller Group has supported tanks on improved ground and repaired foundation of tanks built on unsuitable ground conditi-ons for decades. Foundation Whether the challenge at a site is soft clay resulting in unaccep-table settlement, clay or mixed soils with insufficient bearing capacity, liquefiable soils requiring improvement, or , we provi-de on-time design-build foundation solutions with long-term performance of any demanding tank project. We provide a complete range of geotechnical construction de-sign-build services for planned or existing tanks. If the exisiting ground conditions at your tank site require more than a grade-supported tank, we have options to efficiently match the geotechnical construction technology with the soils to provide a long term foundation performance. Remediation Settlement and misalignment of existing tanks can be remedia-ted economically with specialty grouting techniques that offer limited access constructability, pinpoint treatment, void filling and floor lifting, and re-leveling. Our experienced crews can mobilize fast and work quickly and safely, helping minimize the owners economic and technical losses. To design and execute a safe, effective and sustainable remedia-tionan an exact monitoring during the whole process is absolu-tely essential. We can provide you with a complete monitoring solution which includes control, execution, development and evaluation. We are committed to providing the most economical solution that produces the needed long-term support of your tank.

Foundation and Remediation of all kinds of tank farms We have a worldwide competence for foun-dation techniques in the field of new construction and in remediation of existing tanks.

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Keller Grundbau GmbH Hauptverwaltung Offenbach Kaiserleistrae 8 63067 Offenbach Tel. +49 69 8051-0 - Fax +49 69 8051 278 E-Mail: info@KellerGrundbau.com www.KellerGrundbau.de1000-17Ei

Expertise in tank farms

2. Deep-Soil-Mixing Typically used in soft soils, the soil mixing technique relies on the introduction of an engineered grout material to either create a soil-cement matrix for soil stabilization, or to form subsurface structural elements to support earth or building loads. Soil mixing can be accomplished by many methods, with a wide range of mixing tools and tool configurations available.

3. Vibro Concrete Columns

Very weak, cohesive and organic soils that are not suitable for standard Vibro techniques can be im-proved by the installation of Vibro Concrete Co-lumns. Beneath large area loads, Vibro Concrete Columns reduce settlement, increase bearing capa-city, and increase slope stability.

4. Soilcrete Process

In contrast with the conventional ground stabilisati-on methods Soilcrete may be used for stabilization and sealing of all kind of soil ranging from loose se-diments to clay. This applies also for non homo-geneous soil formations and changing soil layers, including organic material. Soft rock formations ha-ve also been treated by Keller for example sands-tone with weak grain texture.

5. Compaction Grouting When low-slump compaction grout is injected into granular soils, grout bulbs are formed that displace and densify the surrounding loose soils. The techni-que is ideal for side improvement of loose soil stra-ta and remediating or preventing structural settle-ments.

6. Piling Piling involves the installation of structural elements to transfer foundation loads through weak soils to stronger underlying ground. We offer a wide range of piling systems. They may be preformed and dri-ven into the ground or cast in situ.

Safe foundation of tanks - our services at a glance We can offer a complete range of foundation techniques combined with a global service and excellent support for the most economic and sustainable foundation solution.

The most imporant techniques for the foundation of tanks:

1. Deep Vibro Techniques Deep vibro techniques are mainly used under foundations of structures that are to be construc-ted on soils of low bearing capacity. The Vibro Compaction technique compacts granular soils with negligible fines content by rearrangement of the soil particles into a denser state. The Vibro Replace-ment technique builds load bearing columns made from gravel or crushed stones in cohesive soils and granular soils with high fines content.

Foundation and remediation of tanks

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Remeditation of exisiting tanks With the Soilfrac Process fractures are created in the soil which are filled with hardening grout. Every soil for-mation can be improved by multiple rounds of grouting and controlled lifting can be induced.

1. Sleeve pipe installation Sleeve pipes are installed in the soil formation to be treated and the annular space between the borehole and the sleeve pipe is sealed with a stiff cement-bentonite mixture. 2. Soil fracturing For the injection of the Soilfrac-material a grout hose with a double packer at its tip is in-serted into the sleeve pipe. The double packer closes the sleeve pipe on either side of the slee-ve, thus allowing the grouting of individual slee-ves in the area to be treated. 3. Multiple grouting The sleeves along the grout pipe may be used only once or several times according to the technical requirements. The grout quantity, the max. grout pressure and in case of repeated grouting the setting time are strictly met ac-cording to the given specifications. Sleeve pipes can be kept operational for a long period.

Oil Tank, Kloubouky (Czech Republic) New constructed oil tank (diameter 38m, height 16m, capacity 12.000 m) with differential settlements when 60% of the volume was filled with water. With Soilfrac Process Keller stopped the differential settlements remediated the oil tank limited the future settlements under full load to

max. 20 mm.

Oil Tanks, Trieste (Italy) Two crude oil tanks (diameter 40m and 80m) with diffe-rential settlements. The larger tank had a local depression in the bottom plate and a settlement along the shell. With Soilfrac Process the differential settlements were stopped and the tanks were remediated.

Europe Germany: Ludwigshafen: chemical tanks France: Grand Quevilly: tank farm Italy: Trieste: tank farm Portugal: Gafanha de Nazar: liquid tanks Sweden: Helsingborg: sulphuric tanks Serbia: Pancevo: oil refinery Czech Republic: Kloubouky: oil tank farm Bulgaria: Burgas: petrolium terminal Austria: Pischelsdorf bioethanol plant USA Houston area: liquid tank Southern California: fuel storage tanks Southern Florida: fuel storage tanks Chicago: petroleum refinery Canada Edmonton: tank farm Saudi Arabia Saudi Kayan: petrochemical complex India Pardip: oil tank farm New Delhi: tank farm Pakistan Nawabshah: reactor tanks and many more ask us for more information!

Hundreds of References worldwide