Peppermint test: 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.
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.
Our specs call for the Contractor or someone to prepare the test and revome all prep materials from the area, including the peppermint. Then, after airing out the building, then the Inspector enters and noses around.
Steve
We have used the peppermint test to check for small leaks in low pressure steam systems in buildings in New York City. However it is difficult to get access to all apartments to 'smell' the leak, so we give notices to the tenants to notify us if they smell peppermint and they do the work for us.
The peppermint oil is REALLY strong!!