TEHRAN July 26 (Shana)--National Iranian Gas Company (NIGC) is to invest 8.5 billion dollars in Iran Gas Trunkline-9 (IGAT-9) to feed western provinces, an NIGC official said. Asghar Soheilipour said the IGAT-9 designing is expected to be completed in two months. With the construction of this pipeline, in addition to increasing gas supply to western ...