Roscoe Moss Company designs and manufactures specially entry ports to the casing. These entry ports are specific to the design of each well.
In many arid and semi-arid regions of the world, a cause of well failure is buckling of casing from ground subsidence due to over pumping. Use of compression sections can solve this problem.
Fabricated from 3 sections of casing, two of which are the same diameter and wall thickness as the casing. Joints are furnished with beveled steel rings. One ring is welded to the bottom of the upper section and one ring to the top of the lower section. Thus, the joints are free to telescope within the outer section which is equipped with rings at each end.
When casing and screen are installed in an open hole to be gravel packed, they should be suspended from the surface by a heavy duty clamp. This clamp may be supported at the ground surface by beams, or it may rest on or be notched into the surface protective casing. Surface protective casing, in turn, must be supported by beams or grouted in place. The purpose of suspending the casing and screen is to ensure the screen is held in tension during weld construction.
Electro-galvonic corrosion can occur between dissimilar metals (i.e. carbon steel to stainless steel). When joined together, an electronic reaction occurs between the two, corroding the less noble metal at an accelerated rate. This coupling is used to connect dissimilar metals, thereby mitigating the risk of electro-galvonic corrosion.
Double spline lock fittings were developed for fast installation of casing and screen with no field welding required. The double grooves and spline locking mechanism allow for quick connection and separation. This coupling is available in a variety of steel types and diameters.
These connectors are required when connecting a larger diameter casing to a smaller diameter casing.
A bull nose or bottom plate should always be attached to the bottom of the casing or screen installed in gravel envelope wells. Semi-elliptical tank ends, readily available and inexpensive, provide a convenient fulfillment of this requirement.
The Rossum Sand Tester is used to measure sand content of pumped water. This device is reliable, easy to use and relatively inexpensive. American Water Works Association Standard for Water Wells (AWWA A 100) Appendix E, Section E.4.6 "Measurement of Sand Content" states "Measurement of sand content may be accomplished by the installation of the Rossum centrifugal sand sampler..." This device has been manufactured by Roscoe Moss Company for over 40 years.
Measurement of sand content is often required of new water wells to determine if specified operating parameters have been achieved. However, well owners should include regularly scheduled sand tests in operation and maintenance programs.
Measurement of sand production on a regular basis may provide a timely indication of well problems. Should structural defects be detected early enough they may be repaired. If not abated, some conditions could lead to complete well failure resulting in decommissioning and replacement; a costly alternative that may have been avoided.
Please contact us for additional information regarding this product.
The Rossum Sand Tester is used to measure sand content of pumped water. These directions will allow the user to calculate this measurement in units represented as parts per million by volume.
The Rossum Sand Tester can be used to measure sand content in any water system. However, the water sample for sand determination must be carefully obtained. A sample collected from a horizontal pipe at low flow is unacceptable. The sample should be obtained from a vertical or horizontal pipe with highly turbulent flow. Samples taken immediately downstream from elbows, tees, and other fittings that create turbulence are generally satisfactory.
The sand content is determined from the following formula:
|incremental accumulation (ml) / incremental time (mins)|
|ml sand per ml water||=||
| .5 gpm x 231 in3/gal x 16.387 ml/in3
Sand content (ppm) = ml sand per ml water x 1,000,000
|incremental sand accumulation (ml) x 528.3|
|sand content (ppm)||=||
|incremental time interval (mins)|
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