Wort in Sight Glass... Does it get hot enough?

I have never used a sight glass for my wort tun, but was think about installing one. Then I got to thinking (dangerous, hey??)... When boiling the wort does the small amount of wort in the tube get hot enough to kill any microorganisms? Does this wort get some how pulled into the main kettle and get replaced by boiled wort??
thanks

 

Nothing to worry about.

 

You're definitely safe. Even if you can't see it, wort is being exchanged and moving in and out of the sight glass. Remember, pasteurization happens at 180F, not boiling.

 

I don't worry about it but I was curious one day and measured temps in there. Was consistently around 120-130, lower than I expected but I trust that wort gets moved around enough to kill anything off. I'm running electric fwiw. If your direct firing im sure temps gets higher in the sigh glass

 

Thank you all for putting my worries to rest. I will be using electric heating elements in the keggles.

 

FWIW, I don't believe you have to go to all the way to 180F. My understanding is it is a function of time and temperature. At 180F it takes less than half a second, but you can pasteurize at lower temps like 160F for about 30 seconds. Regardless, I don't think a sight glass is anything to worry about.

 

If you gently blow into the sight tube at the top right after the boil, you'd flush the cooler wort into the boil.