What are the functions and characteristics of water filter ...

Features of water filter pipe

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The use of multi-layer sand control filter sleeves has high-efficiency sand control effect, which can well block formation sand and meet the needs of underground sand control. The filter water pipe has uniform filter holes, high resistance to clogging and permeability, large filtering area, low flow resistance, and high oil production. Stainless steel materials have excellent corrosion resistance, alkali resistance, acid and alkali resistance, and corrosion resistance, which can effectively meet the special requirements of oil wells and will not become larger due to corrosion. The multi-layer structure can be welded into a whole to make the filter hole more stable and more resistant to deformation.

What is the function of the water filter

In addition to water inflow, it can prevent particles of soil or rock around the well wall from flowing into the well and silting up the well pipe. At the same time, it also supports and protects the well wall, so that the pumping hole can be used normally. For some hard fissures and dissolution aquifers, the well wall is stable and has no loose fillings. It is not necessary to install water filter pipes when pumping water. For loose pore aquifers or broken bedrock aquifers, suitable water filter pipes must be installed. Cement gravel water filter pipes are also commonly used in agricultural water supply wells, and the brick-wood well walls of civilian wells are actually used to filter water and purify water resources. At the same time, in large-scale national projects, such as the South-to-North Water Diversion Project, the Olympic diving site-Water Cube, East-West transmission projects, etc., high-quality Lida water filters are used.

Four basic types of water filter pipes

1. Mesh filter pipe

If it contains ferrous oxide and calcium carbonate and other salts in the precipitated water, the porosity will be drastically reduced; at the same time, it can be corroded in corrosive water. According to survey data, tube wells with mesh filter tubes rarely have a service life of more than 10 years, and the water production is decreasing year by year.

2. Perforated water filter pipe

The perforated water filter pipe is formed by forming a certain geometric shape and a certain regular arrangement of water inlet holes on the well pipe. This kind of hanging water pipe can only be used directly in the aquifer above the coarse sand. Because of the different geometric shapes of the water inlet holes, they can be roughly divided into two types:

The round hole filter pipe is the oldest and simplest type in history. The perforations can be made in different ways according to different pipe materials. Generally, metal pipes and asbestos-cement pipes are mostly made by drilling or punching, while for concrete pipes, round holes can only be reserved during pouring. The size of the holes is mainly determined by the grain size of the aquifer. The arrangement of the water inlet holes on the pipe wall usually adopts a staggered plum shape. The mutual position of the water inlet holes can also be divided into two types: equirectangular triangle and equilateral triangle. After preliminarily selecting the horizontal and vertical hole spacing for the water inlet and outlet hole arrangement, the hole should be adjusted according to the required hole rate for different pipes, and finally adjusted so that the hole spacing is basically an integer to facilitate processing.

3. Gravel water filter pipe

Although gravel water filter pipe has many advantages over mesh type water filter pipe, it is more complicated to choose filler and its structure, requiring large-diameter holes, etc., so it is difficult to promote it in drilling engineering.

4. Bridge type water filter pipe

Bridge-type water filter pipes have been widely used in developed countries for a long time. They are engaged in hydrogeological exploration, drilling, sinking construction, reservoir dewatering, foundation deep excavation and dewatering, geothermal development and utilization, mineral water development and utilization, ground temperature air conditioning, broken well repair, underground water source Ground water and so on.

The bridge-type water filter pipe has many advantages over other types of water filter pipes due to its special perforation structure. It has the following advantages:

(1) The special structure of the bridge-shaped orifice makes the gravel not easy to block the orifice and has a high water passing capacity. According to a test conducted by the German Nord Company, the porosity of the traditional gravel-filled filter pipes should be reduced by 40%, while the bridge-type filter pipes should only be reduced by 10%;

(2) The special hole-shaped structure of the bridge water filter tube has the effect of enhancing the mechanical strength of the water filter tube, and has a high mechanical strength;

(3) The cost is low, and the cost is reduced by 20% due to the elimination of the bedding and wire winding process in the traditional water filter pipe manufacturing process. And save the time of drilling and winding;

For more information, please visit Water Well UPVC Filter Pipe.

(4) Different anti-corrosion coatings are plated according to user needs, which can increase the service life of the well;

(5) A variety of connection methods can be used, and the down tube operation is convenient;

(6) The gap of the bridge hole can be changed to be suitable for different sand and rock geology.

(7) The unique spiral structure design greatly increases the tensile strength and compressive strength of the pipe body.

Casing is the tubular structure that is placed in the drilled well to maintain the well opening. Along with grout, the casing keeps possibly contaminated surficial water from reaching the aquifer zone underground and prevents contaminants from mixing with the water. The casing also holds back unstable earth materials so that they do not collapse into the well. Some states or local governing agencies have laws that require minimum lengths for casing.

The most common materials for well casing are carbon steel, plastic (most commonly, but not exclusively, PVC), and stainless steel. Different geologic formations and groundwater quality dictate what type of casing can be used. For example, parts of the country where hard rock lies underground are known strictly as &#;steel states.&#;

Residents in some areas have a choice between steel and PVC, both of which have advantages. PVC is lightweight, resistant to corrosion, and relatively easy for contractors to install. However, it is not as strong and not as resistant to heat as steel. Steel, though, is susceptible to corrosion, can have scale build-up, and can cost more than PVC.

Some contractors also use concrete, fiberglass, and asbestos cement casing.

Well Caps

On the top of the casing should be an approved well cap. It should fit snugly so debris, insects, or small animals can&#;t find their way into the well system.

Well caps are usually aluminum or a thermoplastic, and include a vented screen so that the pressure difference between the inside and outside of the well casing may be equalized when water is pumped from the well.

The casing and cap should extend at least 12 inches above the ground. If the well is near a river or stream, it should extend at least past the flood level to prevent overflows from contaminating the groundwater.

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Well Screens

Well screens are filtering devices used to prevent excess sediment from entering the well. They attach to the bottom of the casing or in intercepted water-bearing zones, allowing water to move through the well, while keeping out most gravel and sand. The most popular screens are continuous slot, slotted pipe, and perforated pipe.

Perforated pipe is a length of casing that has holes or slots drilled into the pipe, often after the casing is installed, perforated in place. It is not efficient for aquifers that feature a lot of sand and gravel because it has wide openings.

Continuous slot screens are made of wire or plastic wrapped around a series of vertical rods. This configuration provides consistent, regular slot openings that can be engineered to the particle sizes found in the screened zone. Slotted pipe screens, which have the least amount of open area, feature machine-cut slots into steel or plastic casing at set distances. Both of these are typically installed with a filter pack (gravel pack) that assists in screening and stability of the well.

Pitless Adapters

Pitless adapters provide wells with a sanitary &#; and frost-proof &#; seal between the well casing and the water line running to the well system owner&#;s house.

After a frost line is determined for the area where the well is being installed, the adapter is connected to the well casing below the frost line. Water from the well is then diverted horizontally at the adapter to prevent it from freezing.

For more information on materials used in a water well system, contact a professional contractor in your area.

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