Clay pipes

Application:
Main applications for STÜWA clay pipes are deep observation wells. Suitable screens are gravel-pack screens and wrapped screens without gravel-filling.

Advantages

• Large depths (e.g. 180 m) can be safely sealed.
• Fixed insertion of sealing
• Kf-value < 1 x 10-⁹ m/s (coefficient of permeability)
• No suspension e.g. on centering devices as used with clay pellets
• No disintegration of the clay body during sinking in the borehole
• The compact clay body prevents losses of the swelling volume by internal caverns.
• High swelling volume up to 240 %
• Exact localisation of the clay body horizon guaranteed by geophysics

Form of delivery:

• As a standard feature, clay pipes are available for 2” and 4” PVC-U-pipes.
• 4” only available in thick-walled version with profile sealing ring in pipe connection