To main content

Installation gas pipeline, Gelugor Mainline

The Gelugor transportation system is a 24'' gas pipeline from the Tenaga Nasional Berhad (TNB) Prai Power Station, Mainland Peninsular Malaysia across the Strait of Pinang to the TNB Gelugor Meter Station on Pinang island. The pipeline has a length of 6.4 km and was put into use in the beginning of 2000. Boskalis Offshore has constructed the protection of the pipeline with rock material. The function of the protection differs along the chainage of the pipeline. A shipping channel is situated between the island and the peninsular. The pipeline in the shipping channel has been covered for to protect against ship anchors (drop and drag).

Outside the shipping channel, the pipeline is partially protected to secure the stability of the pipeline. Furthermore, the protection serves to limit the length of the possible freespan to an acceptable length. Spanning of a pipe can be caused by morphological changes of the seabed. The preparations of constructing the protection started in the beginning of January 2001; the rock dumping started in the beginning of February. The environmental conditions, limited time span and life pipeline made the project more complicated.

Caused by tidal variations, the occurring current velocities reached levels of upto 2.0m/s. The water depth along the chainages varied from 0 to 16 meters. A high voltage cable (132kV) was already constructed along the gas pipeline and in use. Precautions were required that the anchors did not damage the high voltage cable. The limited time span of the project was set by the Client to diminish the risk of damaging the pipe. Furthermore, damage of the life pipeline would have heavy impact on the ecological environment. These conditions required accurate rock dumping and tailored working methods.

Related projects

Selected filters
Large-12_overige_financiele_ontwikkelingen.jpg

Cieg GJ1 Cable repair

Channel Islands Electricity Grid, a joint venture between Jersey Electricity and Guernsey Electricity operate several interconnecting power cable systems (power and telecom) between Jersey, Guernsey and France. Both Jersey and Guernsey rely upon the services of these interconnecting power cables and as a consequence there is a demand to reduce the possible effects and impact of failure to these interconnecting power cables. Boskalis were contracted to conduct a preemptive repair replacing a section of cable including the installation two subsea joints on the Guernsey Jersey circuit, close to Havelet bay.

hires-6917.jpg

Construction motorway, A4 Delft-Schiedam

Boskalis Nederland was involved in the construction of the A4 motorway from Delft to Schiedam. The client is Rijkswaterstaat. After 40 years, the construction of this final section will bring to an end the public debate about whether this new road was needed.

Boskalis_Suezkanaal_cutter_suction_dredgers_4153_header.jpg

Channel expansion, Suez

The Suez Canal is one of the world’s main shipping links and thus of major importance to world trade. The canal extends from Suez on the Red Sea to Port Said on the Mediterranean. Egypt’s Suez Canal Authority awarded the contract to double the canal’s capacity to a consortium, which was aptly named the Challenge Consortium by the Chairman of the Suez Canal Authority, Admiral Mohab Mamish.

DSC_0008_header.jpg

Onshore co-mining project, Lelydorp

Suralco L.L.C., an indirect joint subsidiary of Alcoa Inc. and Alumina Ltd., has awarded Boskalis a contract for the mining of bauxite in Lelydorp, Suriname. Boskalis is responsible for the entire mining process, from engineering and overburden removal to bauxite mining and ore delivery.

Picture_6_header.jpg

Port development, Cherbourg

To accommodate an assembly plant for wind turbines, a 220 m quay wall had to be added to the existing quay and two hectares of land behind the new quay had to be reclaimed.

P1030713_header.jpg

Dredging and reclamation, Songdo International City

Boskalis has been awarded a contract by Daewoo E&C for the dredging and reclamation of new land for Songdo International City on the waterfront of Incheon, South Korea. The total value of the contract amounts to approximately EUR 80 million.