Drum bottoms come in several styles:
double crimped and welded
The open head drums we have are all double crimped and welded or triple crimped.
If you prefer one style over another just let me know I'm sure we can take care of you.
In the drum industry the two styles have the same testing requirements and are considered interchangeable. I've been using a triple crimped drum for years with hundreds of hours over a burner with no problems.