Continuous-slot Johnson Screen
The continuous-slot Johnson screen is widely used throughout the world for water,oil,and gas wells,and is the dominant screen type used in the water well industry.
The continuous-slot Johnson screen is widely used throughout the world for water,oil,and gas wells,and is the dominant screen type used in the water well industry.
Continuous-slot screen is made by winding cold-rolled wire,approximately triangular in cross section,around a circular array of the longitudinal rods. The wire is attached to the rods by welding, producing rigid one-piece units having high strength characteristics at minimum weights.
Slot opening for continuous screens are manufactured by spacing successive turns of the outer wire to produce the desired slot size. All slots should be clean and free of burns and cuttings.
Continuous-slot screens provide more intake area per unit area of screen surface than any other type. For any given slot size, this type of screen has maximum open area.
Advantage
1.A continuous slot opening which significantly increases the available open area, thus providing greater access to the water bearing zone.
2.A V-shaped profile wire which avoids clogging and ensures an uninterrupted flow.
3.A uniform and efficient well development due to the continuous slot opening. 4.Ladder-like wire welded screens have a strong structure and high open area, as well as accurate slot dimension.
5.Ladder-like wire welded screens have the features of easy backwashing, last long, safety and reliability as well as low comprehensive cost.
|
SIZE
(inch) |
O.D
(mm) |
SLOT
(inch) |
LENGTH
(m) |
COLLAPSE
STRENGTH (psi) |
TENSILE
WEIGHT (ton) |
WRAP thick*deep
(mm) |
RODS
(mm) |
|
4
|
117
|
0.040
|
3
|
395
|
6
|
2.2*3.0
|
3.8mm/22
|
|
4
|
114.3
|
0.040
|
3
|
395
|
6
|
2.3*3.0
|
3.8mm/22
|
|
6
|
168.3
|
0.040
|
3
|
252
|
8
|
2.3*3.5
|
3.8mm/32
|
|
8
|
219.1
|
0.010
|
3
|
399
|
10.5
|
3.0*5.0
|
3.8mm/48
|
|
8
|
219.1
|
0.020
|
3
|
370
|
10.5
|
3.0*5.0
|
3.8mm/48
|
|
8
|
219.1
|
0.040
|
3
|
323
|
10.5
|
3.0*5.0
|
3.8mm/48
|
|
10
|
273.1
|
0.010
|
3
|
206
|
11
|
3.0*5.0
|
3.8mm/50
|
|
10
|
273.1
|
0.020
|
3
|
191
|
11
|
3.0*5.0
|
3.8mm/50
|
|
10
|
273.1
|
0.040
|
3
|
167
|
11
|
3.0*5.0
|
3.8mm/50
|
Continuous-slot screens provide more intake area per unit area of screen surface than any other type. For any given slot size, this type of screen has maximum open area.
Packing details:
Single with bubble bag and then in wooden case.. Each case is clearly marked with:
Name & identification mark of manufacturer-HuaDong Brand
Batch number
Date of manufacture
Material
Safe heating & application temperature