HONG KONG (AFX-ASIA) – Hong Kong and China Gas Company (3.HK) said it has received formal approval from the Chinese Government to establish a 1.2 billion yuan 50-50 piped gas joint venture with Nanjing Gas General Company. (US$1=8.28 yuan). The company said in a statement the Nanjing-based joint-venture has a registered capital of 600 million….