School boiler repair. Pipe is lifted above floor in gym. Found steam traps are leaking. Shut down heaters in gym to change both traps on the end of the main to get steam up and going will have to return tomorrow to check any other traps in this area. Steam traps are a type of automatic valve that filters out condensate (ie condensed steam) and non-condensable gases such as air without letting steam escape. Replace 3- bucket traps 2 are on the main line 1 on a unit heater Also replace 2- radiator angle steam traps. Material used in notes.