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(borehole) SCREEN thr. MxF, PVC, 3", 90x81mm, NP12.5, 3m

https://unicat.msf.org/cat/product/72907
NST CWATBOREO3S3

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(borehole) SCREEN thr. MxF, PVC, 3", 90x81mm, NP12.5, 3m

Form

PVC screened casing for water drilling, Nominal diameter 3", with a threaded male connections on one end and a female threaded connection on the other. Should be drinking water quality.

  • Length: 3m
  • Inner diameter: 81mm
  • Outer diameter: 90mm
  • Nominal pressure: NP12.5
  • Screened tube

Usually blue.

Several opening size of the strainers are available.

Per piece.

Fit

To be screwed onto 3" threaded coupling male on one end, female on the other. Several types of thread are available. (Gas thread ‘withworth', Trapezoidal thread)

The thread does not require the use of sealants (mastic, glue, tow, etc.)

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Function

Casings having spaces allowing the fluid to pass.

The opening of the strainers depends on the particle size of the formation captured (table 8.XIX). However, before the start of the project, it is not always easy to obtain this information, the opening of the strainers is then chosen between 0.5 mm (fine sand) and 2 mm (coarse gravel, unaltered fractures, etc.).

As the risk of collapse can be significant, the casing is put in place as quickly as possible.
The casing or catchment plan (length and position of the solid tubes and strainers) is established according to the geological section of the borehole where the different “layers” of land and the inflows of water are noted, observed visually during the drilling and through sampling.

​In order to guarantee a good positioning of the tubes in the hole and therefore a good distribution of the filter mass around the strainers, it is recommended to install centering devices around the tubes.

For more information see: "Water, Hygiene and Sanitation for populations at risk". Action against Hunger. Chapter 8 drilling.

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