Picture a triangular wire wound around a cage of rods, the rods themselves welded to end rings. That is how a johnson screens stainless steel barrel comes together. The slot gap is set by shims as the wire goes on, and stays the same along the whole tube. Because the wire is wedge shaped, the gap widens on the inside - so a sand grain that slips through does not wedge once the pump starts. The barrel stays pressure tight and will not collapse under well pressure. We ship tubes in 6 m joints, with smooth, burr-free welds that do not catch debris over a long well life.
Product Parameters
|
Item |
Value |
|
Material |
304 / 316L stainless steel |
|
Slot width |
0.05–30 mm, custom |
|
Outer diameter |
Up to 219 mm standard, larger by order |
|
Length |
Up to 6 m per joint |
|
Welding |
Full resistance weld at each contact |
|
End fittings |
Threaded, flanged or welded coupling |
Components
V-shaped outer wire (the slot surface)
Longitudinal support rods welded under the wire
End coupling rings or threaded ends
Optional centralizers and flush couplings
Spacer shims that fix the slot gap during winding
Lifting lugs for long vertical joints
Our Services
Send us your slot, diameter and length drawing and we cut, wind and weld the johnson screens stainless steel to it. We send samples before a batch order, and each joint is tagged with its material and slot size. Spare centralizers ride along with the shipment.
FAQ
Q: Which slot do I choose for a sand well?
A: Pick it from a sieve analysis of your aquifer sand. As a rough start, we match the 10-percent retaining line of the grain curve.
Q: How do you join two screen joints?
A: Threaded couplings are standard above 168 mm outer diameter. For high-pressure lines we can do flanged or welded ends.
Q: Can the barrel take well pressure?
A: Yes. The rod cage and the welded johnson screens stainless steel barrel are sized for the static and collapse pressure your borehole depth calls for.
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