diaphragm closurediaphragm closure

Diaphragm closure

Pronal diaphragms closure are flexible inflatable jacks. These jacks are installed in the legs of offshore platforms and assist the buoyancy of the fixed platform, while also maintaining its center of gravity when it is installed at sea.

In addition, they are used in many applications such as : 

  • jacket buoyancy 
  • mud barrier 
  • pile floating 

Made from high resistance rubber coated fabric and assembled by hot vulcanisation, our diaphragms closure are designed to take into account : 

  • leg ID 
  • Thickness of the leg 
  • Water depth

Finally, a steel insert is vulcanized into the rubber diaphragm creating a perfect tightness to the Leg. there is no risk for the rubber diaphragm separating from the flanges. 

Our teams can travel on-site to install your offshore buoyancy kits no matter where you are located.



  • Tightness testing can be implemented before installation
  • Penetration testing can also be performed
  • Simulation & calculation of the force required to puncture the diaphragm


  • Air and watertight
  • Insert integrated into the rubber
  • Selection of suitable materials


  • Locking fixation system
  • Suitable for applications at depth
  • Ease of installation

Detailed information

  • Material: Synthétic rubber
  • Technique: hot vulcanization in a vacuum autoclave
  • Dimensions: min. 6″ (152.4 mm) / 118″ (max. 2997.2 mm)
  • Form: cylindrical
  • Temperature resistance: +0 / +60°C
  • Max. thickness: defined by the clients’ specifications
  • Grade of steel: defined by the clients’ specifications

You can not find your dimensions

Our design department employs the best project leaders and designers and will be pleased to develop and create a tailor-made product specially for your unique project.


Composition / Advice

Storage advice
Store in its original case away from light, damp, and temperature variations.

Standards / regulations

Please contact uc
In accordance with the conditions of the Pronal guarantee.


Fact Sheets / Business Guides
  • This field is for validation purposes and should be left unchanged.


Metal flange, screws, and gussets
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