BUCHAREST, Nov 13 (Reuters) - Romanian state-owned gas pipeline operator Transgaz ROTGN.BX posted a net profit of 159.5 million lei ($48.11 million) in the first nine months, slightly below analysts' forecasts. The profit was reported under international financial reporting standards (IFRS) and unaudited. Transgaz was expected to report a profit of 163.3 million lei, based on an average of estimates from 6 banks and brokerages. The firm said its net profit in January-September of last year was 254.2 million lei.($1 = 3.3153 Romanian lei) (Reporting by Ioana Patran; Editing by Radu Marinas) ((ioana.patran@thomsonreuters.com)(+40 21 305 52 65)(Reuters Messaging: ioana.patran.thomsonreuters.com@reuters.net)) Keywords: TRANSGAZ/