Please help with drawing of a pipe

JD, step 3 is a solution for this problem only. It is a shortcut for this particular case. Revolving the profile in the case like this will work as well but it is limited to radius 5 too. Just imagine what shape you end up with if you revolve a profile with radius other than 5.

Revolved radius smaller and larger than 5, if we want the inner half-pipe intact:

JD, step 3 is a solution for this problem only...

Isn't the outside radius supposed to be 7?

That is what I read in the original post.

Your "solution" doesn't look correct to me.

Outside radius of 7 on a pipe that has outside radius 5? I am trying to imagine how it should look like. To me, the only correct solution to this is that a sphere of a radius of 5 is where the 2 pipes join. Just like Remark shows in post #28. No other radius will fit there, if the two joining pipes have common center where they join. Don't you think?

This is what I mean by sphere:

I read the original drawing as outside radius 7

Inside radius 5

resulting wall thickness 2

The two solutions I posted both create spheres at the bends.

OK, I see it now. It does show 7 outside radius when you look closely. My solution and everything I suggested was meant for 5 outside radius of the pipe as well as the radius of the fillet. The procedure is the same though, whether it is 5, 7 or any other number.

Sorry about that.