Trelleborg’s Engineered Products operation has supplied a profile from its range of tunnel segment gaskets for the ‘extension line 5’ project of the Metro system in St. Petersburg, Russia. The challenge was to create a gasket that could operate at greater depths and higher pressures than a standard bored tunnel but still meeting a guaranteed life of 100 years. Working closely with the engineers for the Metrostroy St. Petersburg, Trelleborg

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