TIG,
After your info i tested a lot, and i have the solution.
When i make the pipe along path, i must reverse faces, but i forget before that to explode the group. Then the faces are not reversing.
So it works now i have learned another lesson today.
And FM in Kerkythea means Face Me.
But without your answer i would still searching for an answer, so i would like say to you is my thanks.