What causes this?

[Rick Maday]

Got corrosion?

[Chris D. Duphily]

Got High Humidity?

[Rick Maday]

Originally Posted by cduphily

Got High Humidity?

Thanks.

I guess a better question is do you see anything in the pictures that would be a contributing (and correctable) factor.

No, the condensate line didn't appear to be leaking.

[Jeffrey R. Jonas]

Originally Posted by rmaday

Thanks.

I guess a better question is do you see anything in the pictures that would be a contributing (and correctable) factor.

No, the condensate line didn't appear to be leaking.

Nope... looks like everyday excessive moisture to me.

Guess my question would be why?

[Chris D. Duphily]

Originally Posted by rmaday

Thanks.

I guess a better question is do you see anything in the pictures that would be a contributing (and correctable) factor.

No, the condensate line didn't appear to be leaking.

I assume the humidifier (above the BIP in photo #2) is NOT leaking ... bad float/small crack in the jacket, did you check the feed for the humidifier? Be it a flare, commpression fitting possible small leak you may have overlooked? is this space conditioned? dehumidifier installed? Tough to tell without being there. (overstating the obvious)

[Gary Reecher]

Could have been the piping was sprayed with a gas leak detection solution and was not cleaned off.

[David A. Andersen]

Don't I see a drip on the bottom left of the union? both pic# 1 & 3.

Induced draft leak? Or other leak from above.

[Brian E. Kelly]

Chemical storage (chlorine) nearby?

Old piping used for drip leg and short leg?


Wire brush the rust off and paint it.

[Blaine Wiley]

That looks like standard galvanized pipe. Anywhere that I have worked that gas has been common, only black iron pipe or copper were allowed. Is that standard galvanized?

[Greg Veal]

I'm going to guess higher humidity than recommended (why?), and/or possible stored corrosive agent, and/or possibly leaking corrosive condensate (past or present) leaking onto the piping. I don't see combustion design provisions in the pics. This could be a contributing/possible culprit.
Let us know what you finally determine, after further inspection by a Prof. HVAC Contr.

[sparksnmore]

Looks like black pipe and someone didn't clean off the leak detector solution.

[sparksnmore]

Originally Posted by sparksnmore

Looks like black pipe and someone didn't clean off the leak detector solution.

Oops, sorry, I see Gary already said that.
It IS black pipe.

[Bruce M. Graham, III]

not a problem with the gas pipe, but is the condensate line traped?