No single screen type is appropriate for all wells. Roscoe Moss Company is the only manufacturer in the world producing shutter screen, continuous slot screen, bridge slot screen, and slotted pipe. This ensures that Roscoe Moss Company's customers receive unbiased technical assistance directed toward solving their specific problems.

MossWell™ Shutter Screens

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Shutter screen, also known as louver screen, is manufactured by forming downward facing louver shaped openings into pipe up to 40 feet long. The process incorporates use of an internal mandrel which perforates the shutter against external blocks. Shutter screen is commonly produced from a variety of steel types including carbon, copper-bearing, high-strength low-alloy, and stainless.

This type of screen is particularly suited for use in large diameter, deep, gravel envelope wells. In many parts of the world, wells of this type pump ground water from thick formations consisting of sands and gravels. Shutter screen is the product of choice for these wells because it is hydraulically efficient, strong and durable. The smooth, unobstructed interior of shutter screen allows the efficient use of highly effective development techniques such as swabbing and also facilitates employment of efficient maintenance and repair methods.

Disadvantages of shutter screen include unavailability of slot size smaller than 0.040"; its limited open area also restricts its use in thin highly prolific aquifers. Development techniques such as jetting (highly effective in naturally developed wells but ineffective in gravel envelope wells) may not be be used as efficiently through shutter screen.

MossWell™ Continuous Slot Screens

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Continuous slot screen is manufactured by wrapping a shaped wire around an internal array of longitudinal rods. The wire and rod, generally made from carbon or stainless steel are joined by resistance welding. Screen sections are usually twenty feet long.

Commonly referred to as continuous slot or wire wrap screen, this product was originally developed to overcome problems associated with cable tool wells drilled in fine grained,uniform sands in the North Central United States. These wells were typically completed in relatively shallow, thin aquifers that were very prolific in terms of water production. Continuous slot screens are very effective in wells of this type since they can be manufactured with very small slot size and yet still maintain the necessary open area to minimize frictional head loss.

Most continuous wire wrap screen is manufactured from stainless steel rather than carbon steel in order to avoid problems which often leads to accelerated corrosion.

Disadvantages of continuous slot screen are associated with its relatively low strength which necessitates special handling during installation and development and also restricts the extent of future well maintenance and repair efforts. Since the interior is obstructed by rods, the use of highly effective well development techniques such as swabbing is precluded. Should the screen be damaged, repair by swedging is impractical.

Users of continuous slot screen are cautioned against using this product for purposes other than which it was originally designed.