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Re: Sewer Aerial Crossing

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>I recently designed a natural gas pipeline crossing over a canal. The pipe was large enough that it was supported every 35'by pipe bents. I think the free-board issue is quite critical and shouldn't be ignored unless your beam can take a big strike (from floating debris) in a flood. Else you can consider having your pipe completely submerged at all time and designed for uplift.
A side question.. (my pipeline is yet to be laid)on designing with stainless steel elements,
Where can I get the properties of different types of SS specially 304.
Are there standard sections of SS? Or can we use AISC section table?

S A Masroor
Consulting Structural Engineer
Karachi, Pakistan.

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