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Trelleborg specializes in high quality polymer
solutions for the infrastructure, construction and offshore oil & gas markets. We design and manufacture an extensive range of engineered rubber products and solutions that meet your needs. For these range of offshore products, the Trelleborg group of companies have technical design.

Diaphragm closures seal the platform legs and skirt sleeves to provide buoyancy during the installation of substructures. These closures are attached to the legs and skirt sleeves by means of fastening ring / flanges that also hold the rubber diaphragms. They are made from highly reinforced rubber and are designed to with stand the hydrostatic pressure during jacket flooding operations.

They are pierced by a pile or sometimes by a cutting device. Diaphragms are somtimes used together with inflatable grout packers and mud wipers/ grout seal in a legcan. Please refer to our diagram. Attached is also a chart of the normal sizes of our diaphragm closures & retaining rings / flanges. These dimension can be varied to match specific leg / skirt sizes.

All diaphragms are usually tested up to 1.5 times the operating pressure. We normally use ASTM A36 or equivalent material for the retaining rings / flanges. Our team can design diaphragm closures to your specification and to suit special operating conditions. We offer cost effective solution with superior performance.

Inflatable grouting packers provide a reliable and robust seal between the ID of the jacket / skirt and the OD of the driven pile. When fully inflated by gas or liquid, it seals the annulus and grout is injected between the pile & leg.

Our grout packers are made from reinforced rubber and comes with complete quality controlin terms of pressure testing and weld inspection. Clamping plates hold the grout packers securely inside the legcan. This stringent design and manufacturing process ensure successful sealing performace and proper grout setting.

Grout seals / wipers assist grout packers in ensuring that the jacket pile annulus is clean by proventing mud contamination. Sometimes, it can also be used alone without grout packers - especially at shallow water depths. When the pile is driven through, the tension on the rubber as it slides along the pile seals the annulus and ensures proper grouting. Our grout seals / wipers can toleerate reverse movement in the pile.

We us ASTM A36 or equivalent steel with our grout packers & seals / wipers unless otherwise specified. We can design grout-sealing solutions to your specifications.