Wellscreen/Well Liners

Wellscreen, Well Liners Sizes

Well materials are available in uPVC, HDPE and Steel.

PVC liners are available from a nominal diameter of 25mm up to 200mm, well liners are WRAS approved products under the water regulations advisory scheme BS6920. They are therefore suitable for use in water abstraction projects. Various machined slot sizes to allow for ground conditions are available. The pipe is stocked in lengths of one and three metres, with each length being male/female threaded so that installations can be suited to specific site conditions, in 40mm 60mm & 63mm we also stock 2mtr sections of slotted and plain pipes.

For specification of these materials the following criteria should be stated:

"uPVC casing and wellscreens shall be supplied by an ISO9001 approved manufacturing company, the pipe shall be male/female threaded with machined slots on the wellscreen.

The slots shall be horizontal to the pipe length to prevent slot compressions. The pipe shall be an approved product under the Water Regulations advisory scheme."

*Not water byelaws approved product

Key
ND = Nominal Diameter (mm)
MOD = Maximum Outside Diameter (mm)
MID = Minimum Inside Diameter (mm)
MOSD = Maximum Over Socket Diameter (mm)
MWT = Minimum Wall Thickness (mm)
W = Weight (kg/m)
CCS = Casing Collapse Strength (Bar)

High Density Polyethylene Liners

Stuart Well Services supply a range of well-linings for site investigations, dewatering wells, leachate abstraction wells, water abstraction wells, soakaways and gas abstraction wells.

These are manufactured to meet the requirements of ISO9001: 1994. Pipes are male-female threaded in lengths of 1 and 3 metres.

Specifications are as follows:

• Manufactured from High Density Polyethylene (HDPE)
• High temperature resistance
• Vicat softening point 125º ISO R 306 (B)
• Resistant to aggressive chemical found in landfill sites
• High strength, tough and durable
• Threaded, giving maximum strength of joint with rapid assembly - flush joints
• Metric sizes to suit all horizontal pipework
• Manufactured to DIN 8074
• Landfill site proven for over 10 years

Other dimensions and wall thickness are available on request up to 630mm diameter.

Slot sizes are 1mm standard, other sizes available on request .

Wire Wrapped Wellscreen

Using a wire wedge wellscreen has specific advantages over other steel screens and allow high flows of sand free water into the well because of:

• A large open area
• Close slot tolerance to control fines
• Efficient well yielding
• No plugging

Wellscreens are made in a range of stainless steels 304 or 316 and other weldable metals in a wide range of diameters and slot sizes from 0.25mm to 4mm.

Screens and casings are manufactured to customer requirements with threaded or flange connectors, lead time is upto 10 weeks, so please enquire early.

Bridge Slotted Wellscreen

Bridge slot screens are formed by punching openings into a flat sheet that is subsequently rolled into a tube and welded.

The openings are arranged in staggered rows to maintain the screen's strength.

Advantages of this screen are high strength through resistance to twisting, compressive and tensile forces.

• Slot sizes from 1.0mm to 4mm
• Wall thickness 6mm or 10mm
• Diameters from 150mm to 1000mm
• Open area 6% to 23%

Simple Slotted Screen

These are formed from perforated plate that is rolled and welded. The holes are rectangular in shape and arranged in rows with the longer side of the slot in alignment with the pipe axis.

• Slot sizes from 3mm to 6mm
• Wall thickness 3mm to 10mm
• Open area 14% to 23%