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Geotechnical constraints

Special applications

The GEOFLEX® range

A fitting that can withstand unforeseen geotechnical events

GEOFLEX® is a sliding, flexible and extendible fitting made of ductile cast iron, which is available in diameters of between 100 and 1800 mm. It has been developed for the protection of pipelines against events of a seismic or geotechnical origin, such as :

  • ground movement ;
  • landslides ;
  • subsidence ;
  • earthquakes ;
  • tsunamis, tidal waves, etc.
flexible fitting GEOFLEX, seismic risk
GEOFLEX - A sliding fitting, flexible and extensible, ductile iron


These natural phenomena can affect key infrastructures, such as : power plants, nuclear reactors, dams, reservoirs and water towers, motorways, tunnels, high speed railways, penstocks, etc.
Their pipelines require a protection that is made possible by the GEOFLEX® fitting.

Unique performance

The GEOFLEX® fitting is the result of an innovative and unique design that consists of a sliding collar and two articulated flanged ball joints, assembled without bolts. The range offers excellent mechanical strength and a high resistance to displacement. It complies with the ISO 16134 standard for “Earthquake and subsidence-resistant design of ductile iron pipelines”.

The range GEOFLEX® offers very high performance against geotechnical constraints, such as:

  • Deflection and angular deflection: each of the ball joints offers a wide angular deflection of between 38° and 40°. By offering different collar lengths, GEOFLEX® resists ground subsidence up to 600 mm. Wider ranges can be obtained by putting two fittings together one after the other.
  • Expansion/contraction capacity: the sliding of the collar, in contraction or expansion, between each flanged ball joint means substantial displacement can be obtained.
  • Freedom of rotation: in addition to its capacity to absorb axial displacement and deflection, GEOFLEX® can also rotate at the ball joints, which helps prevent any damage to the flanges.
  • Simple installation: GEOFLEX® connects to ductile iron or steel pipelines through the use of socketed flanged fittings or flanged spigots.

GEOFLEX® has been the subject of a whole battery of tests to verify its perfect behaviour in the face of very severe geotechnical constraints.

instable ground pipe fitting
DN: 100 to 1800 mm
PFA: up to 16 bars
Subsidence capacity: 100 to 600 mm

e-Catalog - GEOFLEX


GEOFLEX ® - Fitting
GEOFLEX ® - Double ball joint
flexion movement double ball fitting
Very high freedom of movement with GEOFLEX ®
GEOFLEX ® - Fitting


GEOFLEX® - Visualisation du comportement dynamique sous contraintes simulées
Pamline TV
Animation GEOFLEX
Vidéo d'animation du raccords GEOFLEX ® à double rotule | Pamline FRANCE

See also

Ductile iron pipelines and unstable grounds.
Comprehensive pipeline solutions