A shield tunneling machine self-developed by China Railway Construction Heavy Industry Co. Ltd (CRCHI), a major heavy machinery producer, passed acceptance tests on Friday and will be exported to Sri Lanka soon.

It will be the country's first domestically-made shield tunneling machine to be exported to Sri Lanka, according to the company based in Changsha City, central China's Hunan Province.

The machine, with a diameter of 3.7 meters and a 120-meter-long body, is relatively small in size but its functions and digging efficiency are equal to larger machines, said Zhang Ruilin, a designer of the machine.

The machine will be used in drainage projects in Sri Lanka starting from April.