[PA Engineer]

Wonder if the constant vibration from the interstate above got to it?

Interstate highway pipeline crossings are usually cased in a larger heavy wall pipe.



You will normally see the vent pipes on each side of the road.



The problem is many of the original crossings had problems with shorted casings which prevented the corrosions systems from protecting the internal pipe when the casings flooded. It usually takes a fairly qualified engineer to interpret the data to find the problem.

There are remediation methods, however it is a problem that is regularly missed. Just a preliminary interpretation of the possible issue involved.

[The Cajun]

Thanks for the info, didn't know that's how they do it.
Have seen those vent pipes before and didn't give it a second thought.

[presently no screen name]

I always enjoy your posts when your engineer hat is on. I remember what you said about Sandy and how NYC will have problems in the future on how they tackled the problem and it wasn’t good!

Thanks for the pictures, if that pipe was ever on any road I traveled - I never noticed them but now I will and know what they are for.

Does a state have engineers inspecting the crossings and is the only way to do this is rip up the road? Do they have ‘ex rays’ to do this?

[21twelve]

“There are remediation methods, however it is a problem that is regularly missed.”

I wonder how much could have been done with the hundreds of millions of dollars that Obama flushed down the hole with those solar energy firms if that had been directed to firming up some of our critical existing infrastructure?