Choosing the Right Aluminum Tube Diameter for Marquee ...

https://www.nfpa.org/codes-and-standards/all-codes-and-standards/list-of-codes-and-standards/detail?code=102 said:

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NFPA 102

Standard for Grandstands, Folding and Telescopic Seating, Tents, and Membrane Structures
NFPA 102 provides requirements extracted from NFPA and NFPA 101 for life safety in relation to fire, storm, collapse, and crowd behavior in tents, membrane structures, and assembly seating.

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I would first determine the required pole properties from the safety codes, then contact aluminum tube manufacturers and ask which products meet those requirements. Tubes not only come in different sizes and thicknesses, but also different alloys and shapes. Indeed, the manufacturer may already be familiar with tent applications like yours and have a standard recommendation. The manufacturer may also be able to advise on restrictions on drilling holes in the tube to mount stuff and advise on suitable butt plates.

A possible vulnerability of aluminum is that the soft metal could be easily dented during transport or erection. How big a dent is allowed while still meeting the codes? If you had to discard a dented pole, that might wipe out your savings.

I think yours is definitely a case where licensed professional engineers might save you money and liability.

Be careful, you may not have as much freedom of choice as you think. In the USA, if people get hurt and if the NPFA codes are not followed, it could result in criminal charges. I'm not familiar with the corresponding code in the UK or EU.I would first determine the required pole properties from the safety codes, then contact aluminum tube manufacturers and ask which products meet those requirements. Tubes not only come in different sizes and thicknesses, but also different alloys and shapes. Indeed, the manufacturer may already be familiar with tent applications like yours and have a standard recommendation. The manufacturer may also be able to advise on restrictions on drilling holes in the tube to mount stuff and advise on suitable butt plates.A possible vulnerability of aluminum is that the soft metal could be easily dented during transport or erection. How big a dent is allowed while still meeting the codes? If you had to discard a dented pole, that might wipe out your savings.I think yours is definitely a case where licensed professional engineers might save you money and liability.

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