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Usage and Installation


Casings

The standard all thickness casing has a collapse resistance rate of approximately 6 bar. The mechanical properties of this casing permit installation in wells up to approximately 100m (328 feet) depending on local installation conditions. Under special installation methods even greater depths are possible.

The thick-walled casing has a collapse resistance rate of approximately 14 bar and this casing can be installed up to depths of more than 300m (1,000 ft). The threads on both types of casing are the same depending on nominal diameter and the tensile strength of these joints permit freely suspended installation at great borehole depths.

Screens

According to DIN 4925 screens can be supplied either plain or with ribs up to ND 200/8". Screens above ND 200/8" are supplied plain only.

The thread joints of National Plastic screens are identical with casings guaranteeing the jointing of different pipe types of the same diameter.

Screens are available in a range of slot sizes and when selecting the type and dimensions of the screen to be used the following should be borne in mind:

  • the permeability of the screen has to be higher than that of the sand or gravel layer directly next to the outer layer of the screen.
  • that slot width should be selected as to permit the construction of a sand or gravel screen around the well screen during devloppement.
  • that the screen does not corrode and that it can be regenerated by mechanical or chemical means without damage.

    • More Informations:
  • Technical Data
  • Screen & Casing Assembly
  • Specifications Sizes
  • Dimensions and Arragement
  • Screw threads
  • HDPE Casing & Screens
  • Well Casing & Screen Main page
    		•