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conduit support truss

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I have a client who wants to install a 2" airline across a 60' outside space with vehicular traffic below so he needs some kind of structure to span the 60'.  The request came in as "design me a truss" and I thought that maybe I could just use a pair of open web steel joists spaced a couple feet apart with bracing in between to make a pipe bridge that can be used for other runs of conduit or piping in the future.  However, I can't help but wonder if there is an easier, more efficient way - like maybe just one larger diameter pipe with the airline run inside or a rectangular HSS with the airline run on top.  Any thoughts/experiences to share?
Thanks in advance
Best regards,
Kenneth S. Peoples, P. E.
Lehigh Valley Technical Associates, Inc.
1584 Weaversville Road
Northampton, PA 18067
Phone: 610-262-6345
Email: kpeoples(--nospam--at)