I have a large bore pipe (40", thickness 5mm) having stiffening rings:
If there is a stiffening ring (lenght 20mm, thikness 10mm) every 1000mm, can i model:

-x-x-x-

where
- : pipe lenght 1000mm, thickness 5mm
x : stiffening ring lenght 20mm, thickness 10mm

or is wrong?