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Saudi ArabiaEconomical solutions for mid to long-term dewatering schemes
Deep Well Dewatering
The Andrews Sykes Hire Saudi Deep Well dewatering system is recognised as a cost effective and efficient way for medium to long term dewatering of large projects, where the excavation is greater than 4 metres or when wellpoint dewatering is deemed inefficient.
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Wellpoint dewatering is one of the most efficient, adaptable and consistent methods of ground water control available. Wellpoint Dewatering systems enable the lowering of the groundwater table, which allows safe excavation below the normal water table. This method has been used for many years for a wide range of applications from small excavations through to major construction projects. This method of dewatering is easy to install, cost effective and reliable. We supply the complete groundwater control service: from site survey design and calculations (using our extensive knowledge of existing subsoil conditions), to recommending and installing the best possible ground water dewatering system.
The principle of Wellpointing is simple. Individual small wells, called Wellpoints, which are generally 40 to 50mm in diameter and either 6 or 7 metres in length, are inserted into the soil using either a drill or high-pressure water depending on the ground conditions. The wellpoints are installed around the proposed excavations and connected via a suction header pipe to a surface mounted centrifugal pump. This unit has a built-in high-capacity vacuum pump, which evacuates the suction pipework automatically priming the pump. Pumping from the Wellpoint installation allows lowering of the ground water within the area adjacent to, or enclosed by, the installation, and excavation can take place in safe, workable conditions.
Wellpoint Dewatering is one of the most economical, flexible and stable methods of dewatering available. Our site investigations and calculations together with our knowledge of previous subsoil conditions, enables us to recommend and install the appropriate equipment. Once the system is up and running, we continue to support the project with our 24/7 service either on site or via our local depots.
Andrews Sykes Hire Saudi offer a full installation service for deep well applications, our highly experienced engineers will visit your site and by using soil analysis will advise you on the best solution for your dewatering requirement. We will advise on the depth of each well and also the quantity and positioning, to ensure that the excavation remains dry through the project cycle. Once the system design has been approved our specialist drilling rigs will bore the holes in readiness for the well screen to be installed. The well screens are typically 200mm or 300mm in diameter and are joined together to provide the required length.
The wells are often surrounded with additional filter media, to aid drainage and prevent debris from entering the system. Once the well has been flushed it is ready to have the borehole installed. The type and size of pump used will match each application. The pump is carefully lowered into the well where it is safely installed. The depth at which the pump is installed will depend on the final depth of excavation, although the pump will always be installed away from the base of the well. The electric cable that is fitted into the pump motor is taken up the well where it is connected to a power supply via one of our control panels.
Each control panel is normally fed from a mains distribution unit, which is supplied from a mains supply or generator. Andrews Sykes Hire Saudi can also provide the distribution unit generator, fuel tank, and even provide a fuel management service throughout the project cycle. Each pump discharge is connected to a common discharge main by means of individual flexible hoses, non-return, and isolating valves. When the system is commissioned, an Andrews Sykes Hire Saudi technician will balance each well to ensure optimum performance.
Once the system is up and running our service continues, some of the larger sites will have a permanent Andrews Sykes Hire Saudi Operator on site 24/7, to ensure that the system is well maintained and operating at peak efficiency. Others may prefer periodic visits. Either way, our emergency service is available 24/7 to provide an instant response to any unforeseen problems.
The Andrews Sykes Hire Saudi Deep Well dewatering system is recognised as a cost effective and efficient way for medium to long term dewatering of large projects where the excavation is greater than 6 metres or when wellpoint dewatering is deemed inefficient. Our deep well dewatering system offers many advantages including:
- Cost-effective dewatering
- Low noise
- Problem free pumping
- Easy to install
- Does not rely on vacuum systems, typically associated with wellpoint dewatering
- Relatively maintenance free
- Ability to penetrate strata impervious to the jetting method of wellpoint systems
- Installation of up to 40 metres deep or more in a single stage
- Capable of pumping high volumes of water from each well
In addition to groundwater lowering for construction site excavations, Andrews Sykes Hire Saudi are often called upon to devise many other types of deep well schemes for a variety of applications. Such applications include the use of deep wells as bore holes where water abstracted from the water table is used for industrial or commercial requirements. We can also use wells to help drain water in low lying areas or areas where drainage is a problem. Whatever the application, Andrews Sykes Hire Saudi can provide the specialist skills and equipment for the installation of deep bored pumping wells. Our specialists will happily carry out a free site survey before offering you a detailed quotation.
