Pipe contracts have been awarded to four companies for a 341 km stretch, GAIL said in a statement.
"The Line Pipes for which the orders have been placed will be used in the Phulpur-Dobhi (Bihar) section of the pipeline," it said.
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The 1,681 km Phulpur-Haldia/Dhamra pipeline will be completed in three phases at a cost of Rs 12,000 crore and cover eastern UP, Bihar, Jharkhand, Odisha and WB.
The first phase at a project cost of Rs 3,200 crore will cover 755 km and include Phulpur-Mani, Mani-Gorakhpur, Mani-Varanasi, Mani-Dobhi, Dobhi-Silao, Silao-Patna and Silao- Barauni sections.
Pipeline laying works for spurlines from Gaya-Barauni- Patna in Bihar are already in progress.
Subsequent phases of the 16 million standard cubic meters a day pipeline will cover major cities including Gorakhpur, Varanasi, Patna, Barauni, Bokaro, Ranchi, Rourkela, Paradip, Bhubaneshwar, Cuttack, Durgapur, Kolkata, Jamshedpur and nearby areas through 30-inch/24-inch mainline and spurlines.
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