Diaphragm closure

Diaphragms closures

Why use a diaphragm closure?

Diaphragms closures are the accepted method of efficiently sealing platform legs and skirt sleeves to provide buoyancy.
We manufacture diaphragms closures from reinforced rubber that allow quickly and easily pierced by the pile.
To ensure quality and reliability, we test each diaphragm to 1,5 times hydrostatic pressure.

Sealing top and bottom of skirt sleeves
Jacket skirt sleeves become buoyant when sealed with diaphragms.
These diaphragms are easily pierced with the skirt pile during driving operations.

Sealing piles and conductors
Pre-stabbed piles and conductors become buoyancy chambers when sealed with diaphragms.
A 5 psi vacuum is sufficient to hold the seal in place against the end of the pile or conductor until the jacket is launched into the water.
After launch, the seal is held in place by hydrostatic pressure.
Sizes : width from 40 mm to 3000 mm, length from 40 mm to 7000 mm.
Sealing J-Tubes and buoyancy tanks and conductors
Sealed eyebolts can be installed through the diaphragms for attaching pull-in cables and diaphragm cutters.

Case of use of diaphragms closures

Maintain buoyancy of the offshore jacket


The diaphragms closures consists of two parts:

  • Two steel flanges
  • One reinforced rubber plate

Rubber compounds for the rubber products are able to withstand the extreme marine environment. We manufacture diaphragm closures with reinforced rubber and we test them to a pressure equal to 1.5 times hydrostatic pressure due to Water Depth.

We choice our components accordingly your requirements


  • Easy and quick set up
  • High resistant materials
  • Custom made
  • No maintenance


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