The Supreme Court has issued notice to Petroleum and Natural Gas Regulatory Board (PNGRB) while admitting an appeal of GAIL (India) Limited challenging the award of Rs 7,000-crore Mallavaram-Bhilwara-Vijaipur gas pipeline project to a consortium led by state-run Gujarat State Petronet Limited (GSPL). A bench headed by Justice TS Thakur on Monday, however, declined to grant stay on the work of the over 1,500 km long pipeline project.