Indradhanush Gas Grid Limited’s (IGGL) has completed the construction of Asia’s largest underwater hydro-carbon pipeline, connecting Jorhat and Majuli in Assam running below the Brahmaputra river, according to IGGL CEO, Mr. Ajit Kumar Thakur. The total length of HDD crossing across the Brahmaputra river is 5,780 metres.

Indradhanush Gas Grid Limited’s (IGGL) CEO, Mr. Ajit Kumar Thakur recently shared that IGGL has completed the construction of Asia’s largest underwater hydro-carbon pipeline, connecting Jorhat and Majuli in Assam running below the Brahmaputra river. Mr. Thakur shared that this is the longest river crossing by any hydrocarbon pipeline of size 24-inch diameter and above in Asia and the second longest in the world. The unique HDD river crossing was executed by intersection method, where two HDD rigs simultaneously started drilling from the two sides of Brahmaputra with intersection of the two drilling heads in the middle at 30 metres beneath the river bed. 

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The project involved the challenging task of laying a 24-inch diameter hydrocarbon pipeline beneath the mighty Brahmaputra river by Horizontal Directional Drilling (HDD) method. The total length of HDD crossing across the Brahmaputra river is 5,780 metres. The pipeline was laid in three separate HDD sections of length 1000 m, 4080 m and 700 m. The next step involves the tie-in of the three sections at two points, located at 15 m and 8 m below Natural Ground Level (NGL). “With the completion of the Brahmaputra HDD, IGGL has achieved more than 71 percent physical progress of the NEGG Project and will be able to complete the Guwahati-Numaligarh section of the project by February 2024”, Thakur said.