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Bridge Slotted Screen Pipe

Bridge Slotted Screen Pipe

Bridge slot screen have bridge opening arranged in rows and are staggered to reduce the negative effect on the screen's strength. Typically the slots are punched in a flat sheet that is subsequently rolled into a tube and welded. Regarded as the best choice of well tube filter, they are widely applied in a variety of fields in the developed countries. According to our after-sale services and the application experience at home and abroad, the advantages of bridge slot screens. When compared with other kinds of screens, can be listed as follows:

Open Area of LongZhongLong Screens

Open Area of LongZhongLong Screens

The main specification

Nominal diameter (mm) 146 159 219 273 325 377 426 529
ID 130 140 138 200 198 254 250 246 305 300 297 357 350 346 406 400 398 502 500 498
Wall thickness 5 5 6 5 6 5 6 8 5 6 8 5 6 8 5 6 8 6 7 8
Coupling outside diameter 146 160 162 220 226 274 278 278 325 328 329 377 378 379 426 428 432 529 530 531

Selection of slot size

Aquifer classification gravel Rough sand Medium sand Fine sand Mealy sand
Screening results (mm) 1-2.5 0.5-1 0.25-0.5 0.1-0.25 0.1-0.25
Bridge slots (mm) 3 1.5-2 1 1 0.75
Filling gravel spec (mm) 4-20 2-8 2-3 2-3 2-3
Filling gravel thickness (mm) 75-100 100 100-200 100-200 100-200

Mechanical property

Nominal diameter (mm) 159 219 273 325 377 426 529
Wall thickness 5 6 5 6 5 6 8 5 6 8 5 6 8 5 6 8 6 7 8
Tensile strength (KN) 230 270 320 390 400 490 653 480 570 760 560 670 893 630 760 1048 782 944 1296
Critical Collapse Strength (N/cm2) 520 690 340 450 170 230 306 136 203 270 128 183 244 92 135 203 90 136 186

Slot sizes and open area

Wall thickness 5 6 8
slot 0.75 1 1.5 2 2.5 0.75 1 1.5 2 2.5 0.75 1 1.5 2 2.5
Bridge lateral spacing 12.75 15 16
Bridge longitudinal spacing 45.50 52 62
Porosity 15.5% 17% 21% 24% 26.5% 14.5% 15.7% 18.9% 22.2% 25.7% 13.5% 14.5% 17.9% 21.2% 24.1%

Choice Of Material and Anticorrosive Coating Of Bridge Slot Screens

Choice Of Material and Anticorrosive Coating Of Bridge Slot Screens

Precautions When Laying the Screens

Suspensory Screen-laying Methods

Suspensory Screen-laying Methods

Optimum Exploitation Flow

Lower Water Price

Water wells, when using bridge slot screens, can easily adjust themselves to aquifer and are regarded as a profitable mode of obtaining water:

Adopt the suspensory screen-laying method.

No clogging Water-carrying Section

Special construction of bridge slot screens make it possible to keep grains of sand it or screens, thus changing the direction of water flow and lessen its resistance.

Bridge Slotted Screen Pipe
Bridge Slotted Screen Pipe

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