Making pipes - some questions

[micheus]

Selected eloop
Edge | rotate > rmb (and selected same eloop for its normal)
noted angle if eyeballed

select next eloop
CntrlD etc etc

Paul, it was what I tryed to do when I wrote "edge loop around its own axis".

For "straight" pipes I can use F6+ShiftD after the first setting, but it doesn't works for curved pipes as I was specting:


p.s. I edited the last comment for the picture.