Bridge Slotted Screen for Water Wells

Bridge slotted screen are high-performance screen pipes specifically designed for filtration applications in water wells, oil wells, and geothermal wells. It features a bridge-shaped slot design that effectively prevents gravel and debris from entering the well pipe while ensuring smooth fluid flow. The bridge slotted structure not only enhances strength and compressive capacity but also improves the durability and applicability of the screen pipe, making it particularly suitable for use in high-pressure and high-corrosion environments.

Two bridge slot screens with different welding methods

Specifications

Material: Stainless steel, steel - mild steel, steel - galvanized, steel - coated plastic
Inner diameter: 130–502 mm
Outer diameter: 146–531 mm
Drill pipe screen thickness: 3 mm, 5 mm, 7 mm
Wall thickness: 5 mm, 6 mm, 7 mm, 8 mm
Tensile strength: 230–1296 kN
Critical compressive stress: 90–520 N/cm²
Welding method: Straight weld, Spiral weld

Straight weld

Spiral weld

Bridge slot
Interfaces: ZSM connection with restraining rod, Round thread connection, Flange connection, Screwing bar connection, API thread connection, Restraining bar connection, Welding bridge connection

ZSM connection with restraining rod

Round thread connection

Flange connection

Screwing bar connection

Screwing bar connection

Restraining bar connection

Welding bridge connection

Table 1: Specifications of Bridge Slotted Screens
Item	Nominal specification (mm)	Inner diameter (mm)	Wall thickness (mm)	Coupling outer diameter (mm)	Tensile strength (KN)	Critical compressive stress (N/cm²)
BDBSS-1	146	130	5	146	/	/
BDBSS-2	159	140	5	160	230	520
BDBSS-3	159	138	6	162	270	690
BDBSS-4	219	200	5	220	320	340
BDBSS-5	219	198	6	226	390	450
BDBSS-6	273	254	5	274	400	170
BDBSS-7		250	6	278	490	230
BDBSS-8		246	8	278	653	306
BDBSS-9	325	305	5	325	480	136
BDBSS-10		300	6	328	570	203
BDBSS-11		297	8	329	760	270
BDBSS-12	377	357	5	377	560	128
BDBSS-13		350	6	378	670	183
BDBSS-14		346	8	379	893	244
BDBSS-15	426	406	5	426	630	92
BDBSS-16		400	6	428	760	135
BDBSS-17		398	8	432	1048	203
BDBSS-18	529	502	6	529	782	90
BDBSS-19		500	7	530	944	136
BDBSS-20		498	8	531	1296	186

Table 2: Specifications of Bridge Slotted Screens Selection
Aquifer classification	Gravel	Coarse sand	Medium sand	Fine sand	Silt
Screening results (mm)	1-2.5	0.5-1	0.25-0.5	0.1-0.25	0.1-0.25
Bridge slot gap (mm)	3	1.5-2	1	1	0.75
Gravel Specification (mm)	4-20	2-8	2-3	2-3	2-3
Gravel Thickness (mm)	75-100	100	100-200	100-200	100-200

Table 3: Specifications of Bridge Slotted Screens and Open Area
Wall thickness	5					6					8
Gap	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 Transverse Spacing	1275					15					16
Bridge Longitudinal Spacing	4550					52					62
Void Ratio (%)	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

Features

High Filtration Precision. Precise control of gap width provides uniform filtration effects, preventing fine particles from entering.
Unobstructed Water Flow Section. The bridge-type structure design provides an unobstructed water flow section, allowing sand particles to be retained directly on the outer side of the pipe diameter, thereby changing the direction of water flow and significantly reducing flow resistance.
High Strength and Good Compression Resistance. The bridge-type design enhances the overall rigidity of the structure, making it suitable for complex geology and deep well applications.
Various materials are available. Stainless steel or carbon steel can be selected, providing excellent corrosion resistance, suitable for different water qualities and underground environments.
Optimal extraction flow rate. Filters designed with the same slot width, diameter, and length can increase flow rates by 3 to 9 times.
Enhancing water extraction efficiency. Reducing water flow velocity and pressure drop, minimizing head loss, achieving high flow rates with no sand content, and extending the lifespan of the water pump.
Customized services. Supports customization of slot dimensions and lengths according to customer requirements to meet different filtration needs.

Application

Groundwater Extraction and Treatment
Oil and Gas Development
Geothermal Wells and Environmental Engineering