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Johnsonslot Screen Tubes (also known as wire-wrapped screen pipes or wedge wire cylinders) are engineered for superior solid-liquid separation. Manufactured by helically wrapping a continuous V-shaped profile wire around an internal array of longitudinal support rods, each intersection is resistance fusion welded to create a high-strength, single-unit construction. The precision wedge-shaped (V-wire) section creates a tapered opening that widens inwardly, providing a non-blinding surface that ensures unimpeded flow and maximum screening efficiency. We provide fully customized slot tubes with specialized end-fittings, reinforcements, and flanges to suit your specific pressure requirements and installation environments. | |||||||||
Johnson Screen Tube are commonly used as screening components in a variety of industries to provide screening and filtration of solids or liquids. Wedge wire screen tubes are constructed of V-shaped wires and support rods. These screen tubes are used in a variety of applications including water treatment, oil and gas industry, food and beverage production, mining, and environmental protection.
Material: stainless steel SS304, SS316, SS316L SS321，S32205，S32750 Hastelloy and other metal alloy wires
Tube diameter: 1 inch to 48 inch
Surface Profile: 10-SLT，12-SLT，18-SLT，or other size
Support rods : SLT-22，SLT-25，SLT-35，or other size
Slot size: 20 micron to 3000 micron (Tolerance:±5 micron),etc.
Filtering Direction: Outside to inside and inside to outside Filtering Direction
End connections: welded end rings (plain beveled ends for butt welding), threaded male and female coupling (spiral), flanged
Packing: in wooden cases, boxes lined with waterproof material.
Note: other specifications available as per request
| Standard constructions(1) | |||
Profile | Support wires | Min. Ø(2) in mm | Min. slot width(3) in mm |
| 4-SLT | SLT-22 or SLT-25 | 20 | 0.015(4) |
| 5-SLT | SLT-22 or SLT-25 | 20 | 0.015(4) |
| 6-SLT-C | SLT-22 | 20 | 0.015(4) |
| 10-SLT | SLT-25 | 20 | 0.015(4) |
| 11-SLT | SLT-20 or SLT-25 | 20 | 0.015(4) |
| 12-SLT | SLT-25 | 21 | 0.015(4) |
| SLT-35 | 30 | 0.05 | |
| 18-SLT | 22-SLT or SLT-35 | 30 | 0.05 |
| SLT-25 | 25 | 0.03 | |
| SLT-D45 | 300 | 0.2 | |
| 10x3 | 300 | 0.2 | |
| 22-SLT | 22-SLT or SLT-35 | 45 | 0.05 |
| SLT-D45 or 10x3 or 25x3 | 300 | 0.2 | |
| 28-SLT | SLT-35 | 215 | 0.2 |
| SLT-D45 or 10x3 or 25x3 | 300 | 0.2 | |
| 34-SLT | SLT-35 | 300 | 0.2 |
| SLT-D45 | 300 | 0.2 | |
| 10x3 or 25x3 | 300 | 0.2 | |
| 42-SLT | SLT-35 or SLT-D45 | 300 | 0.2 |
| 10x3 or 25x3 | 300 | 0.2 | |
(1) Special constructions are possible on request. (2) Each diameter requires new welding equipment. Therefore the standard diameters shown in the next table, are preferred. (3) The minimum slot will increase when the diameter becomes bigger. Other diameters than these standards are available on request. (4) depending on the slot tube diameter. | |||
Products & QC Photos
Versatile Applications Across Industries
Water Treatment: Raw water abstraction, sand removal in wells, and ion exchange resin retention.
Food & Beverage: Malting floors, brewery mash tuns, and vegetable processing screens.
Petrochemical & Refining: Reactor internals, catalyst baskets, and oil well sand control.
Pulp & Paper: Fiber recovery and dewatering.
Mining & Aggregate: Coal washing and centrifugal dewatering.
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