Seals & Diaphragms

We offer big solutions for big challenges in the oil, gas and renewable energy industries; grout seals, tongue seals and diaphragms in moulded polymers. Engineered to meet unique requirements in different applications, our seals and diaphragms are expertly manufactured for maximum resilience in harsh environments and under the most testing conditions.

Grout Seals

Fabric reinforced rubber seals, manufactured as a concrete-filled ‘passive’ solution with none of the reliability issues surrounding inflatable …

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Tongue Seals

Our tongue seals are manufactured with a fabric reinforced polymer and customised for the off-shore wind energy sector. …

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Grout Seals

Fabric reinforced rubber seals, manufactured as a concrete-filled ‘passive’ solution with none of the reliability issues surrounding inflatable options.

Grout Seals, as a passive system (opposed to alternative inflatable active system) have become the product of choice due to their clear operational and cost advantage for the following reasons:

✔ A special Grout Seal is available for structures with pre-installed piles. Pile verticality and positioning tolerance dictates that greater eccentricity may occur between pile and sleeves. The special Grout Seal is designed to accept the increased annular dimension with provision of shape allowing for extension
✔ No hoses, valves or other hardware to purchase, fit or test. This results in clear cost savings and eliminates the dominant cause of frequent grout support system failure
✔ No site testing or commissioning required
✔ The Grout Seal also functions as a wiper, preventing seabed material from entering the annulus to the detriment of grout connection strength
✔ No offshore operation is required
✔ No residual activation hardware remains to cause cathodic protection drain or diver hazard

By combining purity of design and quality of polymer engineering, we provide long-lasting, low maintenance protection.

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Tongue Seals

Our tongue seals are manufactured with a fabric reinforced polymer and customised for the off-shore wind energy sector.

Specifically designed to support the grout between a pile and sleeve on structures where the piles are installed by drilling, our tongue seals can be produced in sizes ranging from 1 to 5 metres in diameter. With a proven track record of reliability, they are designed to ‘self-activate’ as grout is injected – reinforcing overall installation strength and resistance in extremely harsh conditions.

The working principle behind tongue seals for offshore wind turbine structures is:

  • Tongue Seals are fitted prior to the pile or transition piece placed in position
  • The seal can be used where the transition piece is inside or outside the pile
  • The seal works by self-activating as grout pressure is applied
  • The Tongue Seal supports grout between a pile and a pile sleeve on structures where the piles are installed by drilling
  • The seal is fitted on the pile prior to the pile being lowered into pre-drilled hole and ‘self activates’ as grout is injected (Two seals can be used for greater pressure head)
  • Tongue Seals can also be fitted to offshore wind farm structures
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Diaphragms

Fenner Precision offers two types of reliable diaphragm closures for marine platforms; one provides protection for auxiliary buoyancy; …

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Tongue Seals

Our tongue seals are manufactured with a fabric reinforced polymer and customised for the off-shore wind energy sector.

Specifically designed to support the grout between a pile and sleeve on structures where the piles are installed by drilling, our tongue seals can be produced in sizes ranging from 1 to 5 metres in diameter. With a proven track record of reliability, they are designed to ‘self-activate’ as grout is injected – reinforcing overall installation strength and resistance in extremely harsh conditions.

The working principle behind tongue seals for offshore wind turbine structures is:

  • Tongue Seals are fitted prior to the pile or transition piece placed in position
  • The seal can be used where the transition piece is inside or outside the pile
  • The seal works by self-activating as grout pressure is applied
  • The Tongue Seal supports grout between a pile and a pile sleeve on structures where the piles are installed by drilling
  • The seal is fitted on the pile prior to the pile being lowered into pre-drilled hole and ‘self activates’ as grout is injected (Two seals can be used for greater pressure head)
  • Tongue Seals can also be fitted to offshore wind farm structures
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Diaphragms

Fenner Precision offers two types of reliable diaphragm closures for marine platforms; one provides protection for auxiliary buoyancy; the other prevents the seabed material from leaking into the structure.

Buoyancy Diaphragms

This type of diaphragm closure is made from rubber reinforced with polyester fabric, and is flat on one side to achieve a robust seal and eliminate the distortion that would occur with welding.

Mud-Exclusion Diaphragms

These ‘leak eliminators’ are used to prevent seabed material from entering the area between the pile and pile sleeve or structure leg. Used in conjunction with grout seals where seabeds are soft, these diaphragms are manufactured without any tooling requirement – minimising the amount of machining and cost required.

With a rich heritage in rubber moulding and fabrication, together with advanced modelling technology, we offer precise solutions for a diverse range of industries and heavy duty applications. Our rubber mouldings are specially engineered to perform to exacting demands day in day out – protecting equipment, taking the strain, bearing the load, and coming back for more.

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