Rigid pipelines are laid using conventional S-Lay method employing the PLB Hafar Neptune equipped with 2x30T tensioners and 60T A/R winches.
Hafar have also undertaken installation of a piggyback system, whereby a smaller pipeline is attached to the larger pipeline and simultaneously laid.
Pipeline fabricated on lay barge at nearshore is towed/pulled to shore using a specially designed 300T linear winch along the designed route and then connecting it to an existing shore pipeline. Preparation for beach pull operation usually includes pre-trenching, temporary cofferdam and backfilling.
In preparation for the beach-pull, Pre-Trenching is performed along the nearshore pipeline route to meet burial depth requirement. Where necessary, temporary sheetpiles are placed to prevent untimely backfilling. After the pipeline is laid, sheetpiles are removed and deliberate backfilling is done to bury the pipelines for safeguarding.
Post-Trenching
In shallow waters where burial depth requirements still apply, Post-Trenching is done by using high pressure jet sled to remove the seabed beneath the pipeline.