Bob La Londe writes:

On 4/5/2021 10:34 AM, Eli the Bearded wrote:
In rec.crafts.metalworking, Bob Engelhardt wrote:
On 4/3/2021 10:38 PM, Linda Iverson wrote:
What if I just want to use black steel pipe as a curtain rod to hang heavy
velvet drapes spanning a window greater than 12 feet long without the need
for a center support?
If you specify the weight & the maximum sag acceptable, someone here
can tell you the pipe size to use. However, heavy drapes and a 12'
span mean that the sag will probably be unacceptable for anything but
a really big pipe.

Or hide the sag with a valance box.

Elijah
------
as old fashioned as heavy velvet drapes


And trim the bottom so it looks level.

--
This email has been checked for viruses by AVG.
https://www.avg.com

With a 12ft length of "scaffold pole" (as I'd perceive it)
curtain-rail...

Maximum central load before permanent bend =
143.7kg-f
=
317lb-f

At that load, at centre
54 mm deflection
=
2~1/8th inch deflection

If two children were climbing the curtains at the middle, you'd have
higher concerns than whether the bottom of the curtains is still
exactly level with the floor for the duration of their adventure...

Rich Smith