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Structural Pipe strength Question
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Posted by: Rick Zytaruk

03/31/2010, 16:38:54

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I need to hang a solar panel about 9 ft off the ground, and plan to attach it to a steel pipe which will be anchored to a rock base. I am using Schedule 80 steel pipe. The pipe will need to handle wind pressure of up to 19 Kilonewtons. Can anyone advise me how to decide if I can do this with a 4" diameter Schedule 80 steel pipe, or if I need to go with 6" diameter...?







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: Structural Pipe strength
: Structural Pipe strength -- Rick Zytaruk Post Reply Top of thread Engineering Forum
Posted by: RWOLFEJR

04/01/2010, 10:13:43

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There are calculators on this site you can plug your information into to see what will work for you.

Without any calculations... If you have figured this out this far with your weight of this kite and wind effects at ??? KiloNewtons... Why not go 6"?

For 9 foot plus whatever you're going to poke into your rock... say 12 foot total... you'll be looking at about $80.oo Max. additional cost over the 4" to go stouter.








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: : Structural Pipe strength
: : Structural Pipe strength -- RWOLFEJR Post Reply Top of thread Engineering Forum
Posted by: Pinkerton

04/01/2010, 11:56:43

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Rick,

Is that the gust load or load for the prevailing winds? Out here in the boonies we get gusts up to 55 mph. Your local County will have "Code" for max wind loading for structures and I would go with that if that is not what you are already using.

We have a lot of solar out here and it is not uncommon to see them facing in funny directions after a particularly blustery day. I have made many repairs for neighbors.

A 9-foot pole is a lot of unsupported pipe and I would strongly suggest you re-think just a single pipe. I would be building a structure to reduce that 9'. Gust loading and harmonics can provide some surprising, but unhappy results.

How many axis are you tracking? If only one axis then maybe consider an A-frame approach. Or something called a "Hinge" mount.

Dave








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