Pakistan and Iran will sign Operational Agreement on the multi-billion gas pipeline in Tehran on March 16, after which work on the project could be initiated, a high level meeting was told on Friday, the Prime Minister’s office said. Prime Minister Syed Yusuf Raza Gilani who presided over the meeting on energy situation in the country and discussed host of options including Iran-Pakistan-India (IPI) gas pipeline to deal with the energy shortage, a statement said.