English to Japanese Tech/Engineering Construction / Civil Engineering 配管工事

The final test, with fixtures in place, can be made with either smoke or peppermint. To make the peppermint test, seal all traps with water and all openings with caps or plugs. All windows and doors should be closed tightly in order to aid in the detection of leaks. The system is partly filled through its highest point with a solution of hot water and oil of peppermint. The tester should avoid getting oil of peppermint on his hands or clothes.

To detect the leaks, he will have to be entirely free of its odor. After solution is added, the system is capped and allowed to stand for a short time. Then the tester goes over every joint, fixture connection, and trap. Wherever he detects the odor of peppermint, there is a leak. Note that the system needs to be only partially filled with the oil and hot water mixture as it vaporizes and so reaches all points.
http://www.plumbing-basics.com/water-supply/testing.htm