Water wells, when using bridge slot screens , can easily adjust themselves
to aquifer and are regarded as a profitable mode of obtaining water.
------reducing the water velocity(V1>V2)
------reduction of pressure fall
------Reduction of the head loss(R1>R2)
------higher flow rate(HMT1>HMT2)
------no sand in water
------prolonging the life span pumps
1.The screen shall be of 304 ANSI stainless steel bridge slotted screens furnished
threaded and coupled to the same standard as the casing.
2.The Contractor shall provide for the Engineer’s approval details of the physical
and mechanical characteristics of the screens as well as mill certificate(s).
3.Screens may be bridge slotted, louver form or wire wound on perforated pipe.
4.Screen openings shall be 1.0 mm opening in sandstone aquifers and 1.5 mm
in the fissured volcanic with a minimum open area of 10%.
5.Fittings are to be of the same material as the screen.
6.The exact location of screen joints will be directed by the Engineer
on the basis of the nature of the cuttings and the electrical logging results.
7.The collapse and tensile strengths of the screen and casings shall be
commensurate with their location.
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