why do man holes always have steam coming out of them

TechBoyJK

Lifer
Oct 17, 2002
16,699
60
91
I work in a big city and the manholes are always steaming like there is a big ass fire. Why?
 

AvesPKS

Diamond Member
Apr 21, 2000
4,729
0
0
I don't know, but in DC there were exploding manhole covers last summer. Maybe they need to let off steam or they explode...:confused:
 

Bulk Beef

Diamond Member
Aug 14, 2001
5,466
0
76
Originally posted by: AvesPKS
I don't know, but in DC there were exploding manhole covers last summer. Maybe they need to let off steam or they explode...:confused:
I actually saw one blow in Bethesda. Prompted me to say the F word in front of my parents for second time in my life.
 

New York city manhole covers steam because of the many small leaks in the steam pipes that heat the builings, some of these pipes are well over one hundred years old.
 

dman

Diamond Member
Nov 2, 1999
9,110
0
76
But do you know why the are round instead of other shapes?








It's rather obvious if you do. But then I wonder why sewer grates aren't round as well... I guess because they generally don't go down them.





The answer, is because it's round it can't fall in the hole based on the cover being larger than the opening. If it was a different shape (square), it could fall in if you turned it a certain way.




 

dman

Diamond Member
Nov 2, 1999
9,110
0
76
Sewer grates aren't hinged around here. I've seen a few that feel down from kids f-in with them.
 

dr150

Diamond Member
Sep 18, 2003
6,570
24
81
Steam from the rats taking showers and steam baths down there.