A stainless steel pipe elbow has a seamless inner liner with an upstream beveled end, which makes a direction for fluid flow away from the interior surface of the pipe elbow. So it can protect the interior surface of the pipe elbow from abrasive particles included in the fluid. And a downstream beveled end help fluid to flow away from the inner surface of downstream pipe sections. Maybe there's a particle trap cavity contained in the pipe elbow, this equipment is used to filter particles suspended in the fluid flow.