 | More open area. Compared to alternative designs
such as slotted pipe, louvered screen or perforated pipe, Johnson
screens have from 3 to 15 times as much open area for a given
diameter and slot opening size.
This means more water can enter the well more easily. Pumping costs
are lower. Water enters at lower velocity, reducing erosion of the
screen surfaces. The water also undergoes less pressure drop,
reducing mineral precipitation which can cause encrustation on the
screen surface. It also means wells can be successfully installed
even in very thin aquifers.
| Close-tolerance, precise slot openings. Slots as
narrow as 0.002" and up in 0.001" increments allow precise
matching of the screen to the aquifer materials. Combined with the
high percentage of open area in the screen, this allows excellent
access to the formation for better well development - a process of
pumping the finest formation particles through the screens and out
of the well. Once completed, this process creates a more permeable
zone of coarser materials around the screen which permits easier
water flow into the well. The size of the slot openings is
controlled to within 0.001" to prevent sand from entering the
well where it can cause pump wear and even eventual well failure.
| Non-plugging slot design. Every Johnson well
screen is made with a single continuous slot spiraling around the
complete screen length. This slot is inwardly enlarging, allowing
only two-point particle contact which substantially reduces the
chance of plugging.
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