In appropriate ground conditions a wellpoint system can be installed speedily and made operational rapidly.
Well point dewatering system procedure.
Out of them dewatering by well point system is one of the best logical and economical method.
By creating deep wells around the vicinity the groundwater is made to fall into them under the influence of gravity.
The following procedure is adopted in the well point.
This method uses the venturi principle where high pressure water is circulated through eductors in the base of each well to create a vacuum that helps promote drainage.
Wellpoint dewatering is widely used for excavations of shallow depths especially for pipeline trench excavations.
In well point system the water is generally lifted by difference between ambient air pressure and the lowered pressure created by the pump.
Water is released at the rate of 20 to 25 liters per second at these well points which causes the soil to be dug and the well point to sink deeper into the ground.
Operate the dewatering system continuously 24 hours a day until drain and structures have been constructed to fill material and until written by authorization to.
Well points are prepared at a distance of about 1m around the area to be excavated.
The eductor well method is a dewatering process used to control pore water pressures in materials with low permeability characteristics such as fissured clays or silts.
Deep well method of dewatering excavations just like the wellpoint method wells are drilled around the excavated area but the diameter of wells in this case varies between 150 200mm.
Npe stock a large range of wellpoint pumps designed and proven to be the most effective for wellpoint dewatering activities.
Generally well point system is used to lower the ground water table up to 6 m or less.
The main header pipe is connected to a wellpoint dewatering pump and then discharged either to a designated point or through a water treatment system depending on water quality.
Well point systems a well point system consists of a number of well points spaced along a trench or around an excavation site all connected to a common header which is attached to one or more well point pumps.
Wellpoint dewatering is a simple yet efficient method of lowering the water table in excavations.
Procedure of well point system.
Well point assemblies made up of a well point screen riser pipe and swing joint with tuning are generally installed by jetting.
A wellpoint dewatering system consists of a series of shallow wells known as wellpoints which are installed at a pre determined depth and appropriate spacing around an excavation.
Npe are the wellpoint dewatering professionals.
