Libya is one of the driest countries in the world. There are places where decades may pass without any rain, and even in the highlands rainfall seldom happens. Less than 5% of the country receives enough water for settled agriculture.
The Hasouna-Jeffara System is designed to supply 2.5 million cubic meters of water per day from well-fields at Jabal Hasouna to the Jeffara Plain and to Tripoli at the coast. This water flows through pre-stressed concrete cylinder pipe of 4 meters in diameter as well. The overall length of the conveyance pipelines is approximately 1,275 km.
Trelleborg supplied specially engineered O-ring profile to form a permanent flexible sealing system between the pipes. Due to the size of the concrete pipes, the sealing rubber needed to withstand enormous forces. That is why our seals are made of high tensile strength rubber. In total, we delivered 1,250 tons of sealing material.
The F-117 O-ring is a tailor-made ring, developed and produced on request. F-117 O-ring profile used for the GMMR application requires a special rubber compound as high tensile strength is required.The joint design is based on an accurately formed groove on the spigot end of the pipe into which the O-ring is stretched.
High accuracy and consistency of the seal cross section is essential as the seal’s volume is measured in a displacement tank to ensure the exact amount of rubber is used. The bulk modulus of the seal in the captive groove is used to generate a high interface pressure resulting is a high performance joint.
The joint uses an O-ring – it’s a pressure joint which requires very high accuracy of the O-ring extrusion. The O-ring is measured by 'volume' and then quality controlled using linear dimensions.
Whatever your demand is, sealing systems for pipes, manholes and connectors or rehabilitation solutions for existing infrastructure, Trelleborg can help you to make leak-free hassle-free across the whole pipe cycle.
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