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the only thing i find in drip legs is oil and maybe a little metal from cutting threads
Thats why I call them dirt legs, most of the time. Around here, they want dirt (drip) legs on furnaces and water heaters, but rarely do I see them on stoves or dryers, can't explain it. But they don't want the drip legs exposed to freezing weather, even though I never seen condensation in one ever, & I installed many on roof top furnaces, & never got a violation, or had any problem with freezing. Didn't even think about it, until about 5 or 6yrs ago, when an inspector made me remove the drip leg on a nat gas backup generator. Reason why I probobly never thought about it,......BECAUSE I HAVE NEVER EVER SEEN WATER IN ONE.
Well a lot of times manufacturers specs. requires therm on certain appliances.Got failed once for not having one on a furnace. Then was told we don't need to install them becuase the gas was cleaner and had less condensation . I still install them at the appliances.Not in the middle of a run where you have to drop down /jump up though. As far as the drip legs on generators etc. , most inspectors do not like them because they make it easy for you or someone else to add on after the fact..
''Beer is proof that God loves us and wants us to be happy" Benjamin Franklin
2009 UPC Section 1211.8.1 For other than dry conditions, a drip shall be provided at any point in the line of pipe where condensate could collect. One of the towns I work in requires them. I think it's a pet peeve of the inspector (Authority Having Jurisdiction).
Drip legs are intended for unoccupied gas appliances. That would be any appliance such as a furnace, boiler, or water heater that is capable of turning on by itself. Stoves, dryers, gas logs, and fire places generally require someone present to monitor the start up.
Working in SF was the worst. You would have to have a valve and a cap to clean them out. By code they are supposed to be after the shutoff valve to the appliance. I think most inspectors there are not professionals, just appointed by a family member in city hall.