How Does Water Well UPVC Filter Pipe Work?

Casing

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.

For more information, please visit SINCO.

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.

For information on well caps, click here.

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.

If you want to learn more, please visit our website Water Well UPVC Filter Pipe.

When drill a groundwater monitoring well into an aquifer to take water, some water fills the bottom of the pipe, but not enough to make it work properly. In addition, the water will be filled with sediment and other particles. Well screen will solve these problems.

Water Well Screen is a filter that allows water to enter a pipe from multiple entry points. It can be made of a variety of materials (especially UPVC, HDPE and stainless steel). Water well screen has a large surface area through which water can penetrate. 

It is resistant to corrosion because it will come into contact with water. Besides, It has a high strength to keep the surrounding structure intact. The openings of the well screen can be small enough to block the large number of formations around them. The flow of water through the screen would be consistent.

It is recommended to install water well screen for all environmental drilling operations. It helps extend the life of the well and keeps the flow of water unrestricted. Sand and fine powder sand, these fine particles can be filtered out before water is available. Water well screen help to exclude most of this fine material from well water. 

Different type of Water Well Screen

• Wedge wire well screen

The well screen is made of a variety of SS 304 or 316 and other weldable metals, ranging in slot size from 0.2 mm to 4 mm. The screen and housing are manufactured according to customer requirements with threaded or flange connectors. 

• Bridge type well screen

It has high-strength by resisting twisting, compression and tensile forces.

-Slot sizes: 1.0 mm to 4 mm

-Wall thickness: 6mm or 10mm 

-Diameter from 150mm to mm (can be customized)

-Open area: 6% to 23%

• Simple well screen

They are made of rolled and welded perforated plates. The holes are rectangular, arranged in rows, and the long edges of the grooves are aligned with the tube shafts. Slots range in size from 3 mm to 6 mm with wall thicknesses of 3mm to 10mm. And open areas ranging from 14% to 23%.

If you are looking for more details, kindly visit HDPE Dredging Pipes for Philippines.