On Sun, 4 Apr 2021 21:19:14 -0500, Robert Nichols
wrote:

On 4/4/21 4:52 PM, Clare Snyder wrote:
On Sun, 4 Apr 2021 09:36:53 -0500, Robert Nichols
wrote:

On 4/3/21 11:47 PM, Clare Snyder wrote:
On Sat, 3 Apr 2021 19:38:26 -0700 (PDT), Linda Iverson
wrote:

On Friday, August 2, 2019 at 6:18:04 AM UTC-7, Goncalves wrote:
replying to mjacobsen925, Goncalves wrote:
Really mjacobsen925, a forum is where one asks questions not where one gets
censored.
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for full context, visit https://www.polytechforum.com/metalw...pe-639655-.htm

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? I’ll anchor ends using flanges (nipples and elbows) screwed into solid wooden header above window. Seems like it should be more than strong enough for such a girly thing.
2 or 3 inch might work but not 3/4 or 1 inch unless you want them to
sag

The pipe, even 2 inch, will sag just from its own weight.
Sched 40 will sag - sched 80 MIGHT work in 2 inch but not with HEAVY
drapery

A 12 foot length of 2 inch Sched 80 steel pipe would weigh over 60 lbs.
That's quite some curtain rod!!
But it will support itself and some load over a 12 ft span. (about 1
1/2 times?? as much as sched 40.

Just did as bit of investigating and 1 1/4 inch sched 80 should be
adequate for a pretty heavy curtain - and weigh about 40 lb? - about
10 lb per meter) will sipport about 30 lb evenly didtributed with
about an inch of deflection.
Sched 40 will only handle around 20 lb with almost 1 1/2 inches of
deflection with a wight of ropughly 30 lb.