spiral pipe prefarable angle for each pipe diameter

[samehmurshid]

please i need your help urgently i have an offer for pipe spiral pipe and i dont have the prefarable angle is should work with for each pipe diameter and i need to calculate the needed steel coil width for each pipe but i need to know the angle to get the B factor the coil width (the used steel quality will be API 5L Gr B , and S235JR)

D t
269.032 7.93
322.872 9.53
372.872 9.53
455.8 10
524 10
582.8 10

your co-operation is highly appreciated

[samehmurshid]

also we have four work offers if any one is interested on them with a good salaries more than 2500 $ per month + accommodation

Slitting line Mgr
ERW line Mgr
Spiral line Mgr
coating line Mgr