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Submarine pipe line (Hong Kong Special Administrative Region)

Top) Concrete weight coating work at site
Bottom) Pipe jointing and launching barge bottom pull laying works
[Location]
Hong Kong Special Administrative Region

Submarine pipeline project for Water Supplies Department, Hong Kong Special Administrative Region

This project is the construction of the water supply main pipeline (42-inch diameter) from the Kowloon Peninsula to Hong Kong Island. It consists of 2.1 km of submarine piping and 1.7 km and 0.4km on-land piping for Kowloon and the Hong Kong Island shore side, respectively.
JFE Engineering was involved in the concrete weight coating with a thickness of 8 inches on the external surface of the 48-inch steel pipe joints and in the laying of the submarine pipeline.
The pipeline on the seabed was laid by the bottom pulling method as follows:


(1) Moor the work barge equipped with the pipe line-up, welding, inspection facilities and launching platform on the Kowloon side;
(2) Install the pulling winch (linear type winch with a capacity of 150 M tons) on the Hong Kong Island side;
(3) Lay the pulling wire for towing the pipeline on the seabed along the designated route;
(4) Weld each 12-meter-long pipe joint on the work barge and inspect them using radiography;
(5) Apply anti-corrosion coating at the welding joints;
(5) Launch and tow the welded pipes from the work barge to the seabed by winching of pulling wire; and
(6) Repeat operations (4) and (5) above in intervals of 12 meters until the top of the pipeline reaches the Hong Kong Island side.