Geotechnical Materials - Well Liners

Well materials are available in uPVC, HDPE and Steel.

PVC liners are available from a nominal diameter of 25mm up to 200m, 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.

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."

Nominal Diameter (mm)
Max Outside Diameter (mm)
Min Inside Diameter (mm)
Max Over Socket Diameter (mm)
Min
Wall Thick-
ness (mm)
Weight (kg/m)
Casing Collapse Strength (Bar)
19
28
19
28
2.5
0.30
20*
24
33.5
25
33.5
3.5
0.42
32.1
35
42
34
46
3.5
0.63
46.3
50
60
50
60
4.0
1.06
22.9
80
88
78
95
4.0
1.59
6.9
100
113
101
120
5.0
2.54
6.4
115
125
113
130
5.0
2.82
4.6
125
140
125
148
6.5
4.05
7.4
150
165
152
172
5.7
4.23
2.9
150
165
147
174
7.5
5.53
6.9
200
225
207
235
7.6
7.74
2.7

*Not water byelaws approved product

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

Outside Diameter (mm)

Inside Diameter (mm)

Weight (kg/m)

40

28

1.05

63

51.4

1.05

90

73.6

2.12

110

97.4

2.08

160

141.8

4.35

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

Slot sizes 1 or 2mm standard


Steel Well Liners

Wire Wrapped Screen

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

  • Large open area

  • Close slot tolerance to control fines

  • Efficient well yield

  • 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 Screen

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 1.0 to 4mm

  • Wall thickness 6 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 3 to 6mm

  • Wall thickness 3 to 10mm

  • Open area 14 to 23%

 

Email Us or call 01953 454540 for more information

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