... 3)Surface:Oiled or black painted to prevent rust.4)Usage:For conveying gas,water,and oil in both the oil and ... natrual gas industries5)Sour service:Acc to NACE MR-0175 or without6) ... engineering, Mining and Resources, Process Engineering, Materials Handling,Mechanical Parts 4>Traffic Walking Rails, Roll-up Doors, Guardrail, Plaza Structure, Signage ...