GEOFLEX® fittings

Illustration of a double-ball joint
GEOFLEX®’s movement

GEOFLEX® fittings

Fittings GEOFLEX
Int/Ext - Blue epoxy powder (PECB)
Main features

Main characteristics:

  • EPDM elastomeric gaskets
  • External and internal coating : Blue Epoxy Powder 250µm (PECB)
  • Bolts & nuts: stainless steel grade 304
  • Performances comply with ISO 16134 standard
  • Type test (in part, where relevant) compliant with EN 545 standard

Field of use:

  • Mainly water supply pipelines
  • Anti-seismic protection of pipelines
  • Protection of pipelines against landslides, subsidence of loose or unstable ground
  • Stress caused by earthquakes, seismic earth movements, tsunamis, tidal waves, etc.
  • PN16 bar

GEOFLEX® is a range of ductile iron flexible fittings, capable of sliding, extending, compressing, rotating. GEOFLEX® fittings are designed to protect water pipe works against stresses caused by occasional but major geological events (

see video


  • Landslides, subsidence of loose or unstable ground
  • Stress caused by earthquakes, seismic earth movements, tsunamis, tidal waves, etc.

Illustration of a double-ball joint GEOFLEX®’s movement possibilities

A GEOFLEX® fitting comprises:

  • a central part (sleeve), allowing an axial slide (compression & expansion), see B on above sketch
  • at each extremity, 1 flanged ball-joint, allowing a maximum angular deflection (see A)

(*) the deflection value (h) mentioned depends on the central part m (sleeve), installed between the two ball-joint flanges. For a same DN, different deflection values are obtained thanks to the installation, during production, of a longer or shorter sleeve, whereas the ball-joint flanges remain identical.

DN1100 up to DN1800 imply a specific price and lead time enquiry, as these fittings require pattern creation and testing, these operations being not necessary for smaller DN.

Informative type-installation sketch

GEOFLEX® fittings (see G on sketch) can be installed on Natural (see T on sketch), Classic or Integral pipes ranges via the use of spigot-flanged fittings and flanged socket fittings (see B on sketch).

The design of the fitting’s central part (sleeve), sliding inside the ball-joint flanges at each extremity, allows contraction and expansion movements.

The overall sliding capacity (expansion/contraction) varies from 100 mm (+/- 50mm) up to 600 mm (+ 350mm/-250mm). A table recaps all these values DN per DN.

Project design, choice criteria

GEOFLEX®: a wide choice, ranging from DN100 up to DN1800, PN16. The selection of a GEOFLEX® fitting for a given DN, depends on the expected subsidence magnitude, which it may have to withstand.

This subsidence is evaluated & assessed depending of geotechnics or seismic stresses, and on the nature of grounds met during the project design.

The selection of the right GEOFLEX® fitting is the responsibility of the consultant, once considered the geotechnics parameters of the project.

Several possible deflection values (h) , ranging from 100 mm up to 600 mm and various deviation angles from +/- 30° up to +/- 38°, address DN by DN the foreseeable stress levels.

Between the 2 flanged extremities, the sliding central part (sleeve) of a GEOFLEX® fitting allows axial compression & expansion, varying from 100 mm (+/- 50mm) up to 600 mm (+ 350mm/-250mm), depending on the DN. A table recaps all values related to each DN.

Main GEOFLEX® fittings performances

GEOFLEX®double ball-joints fittings

DNDeflection hDeflection θExtension / Contraction loResistance to dismounting
100100 → 600+/- 38°100 (+/- 50) **300
150100 → 600+/- 36°160 (+/- 80)450
200100 → 600+/- 34°160 (+/- 80)600
250100 → 600+/- 32°160 (+/- 80)750
300100 → 600+/- 30°200 (+/- 100)900
350100 → 600+/- 30°200 (+/- 100)1050
400100 → 600+/- 30°240 (+/- 100)1200
450100 → 600+/- 30°240 (+/- 100)1350
500100 → 600+/- 30°300 (+/- 150)1500
600100 → 600+/- 30°300 (+/- 150)1800
700200 → 600+/- 30°400 (+/- 200)2100
800200 → 600+/- 30°400 (+/- 200)2400
900200 → 600+/- 30°440 (+/- 220)2700
1000200 → 600+/- 30°440 (+/- 220)3000
1110400+/- 20°600 (+350/-250)3000
1200400+/- 20°600 (+350/-250)3600
1400400+/- 20°600 (+350/-250)4200
1500400+/- 20°600 (+350/-250)4500
1600400+/- 20°600 (+350/-250)4800
1800500+/- 20°600 (+350/-250)5400

(*) The overall sliding (contraction/expansion) range depends on the length of the central part (sleeve) of the GEOFLEX® fitting. The lo value mentioned is the sum of both contraction and expansion movements, expressed as +/-.

(**) DN100- Expansion / Contraction: +80 mm/ -20 mm in case of a 600 mm deflection (h).

(***) The maximum resistance to dismounting must be equal or superior to 3Xn (in mm) n expressed in kN. This resistance value is based on ISO 16134 standard: ‘’Earthquake and subsidence-resistant design of ductile iron pipelines‘’.

Example: for a DN150 GEOFLEX fitting, the maximum guaranteed value of resistance to dismounting is calculated as follows: R dismounting = 3 x 1500 = 4500 kN


GEOFLEX® fittings are individually packed on pallets, which are then shrink-wrapped (transparent plastic film).

The 2 extremities of GEOFLEX® fittings are fitted with PE protective caps. GEOFLEX® fittings feature 4 threaded retaining rods (see installation sheet), aiming:

  • To prevent any axial unexpected sliding movement during transport & handling
  • To keep the overall distance (between flanges) identical to the factory-settings, until the fitting assembly and the overall pipeline installation is hydraulically tested & approved

Each fitting is fitted with 2 PE sleeve and 2 securing wires, which will be installed on each pipeline extremity, prior to the installation of the GEOFLEX® fitting. See installation sheet.

Laying procedure