What does 49 CFR 178.33-6 (Manufacture) require?

Short answer

49 CFR 178.33-6 requires that inner nonrefillable metal receptacles be manufactured by appliances and methods that assure uniformity, with no defects that could weaken the container, and a smooth surface finish. Seams must be made by specific methods, and ends must be of pressure design.

The rule says

"By appliances and methods that will assure uniformity of completed containers; dirt and scale to be removed as necessary; no defect acceptable that is likely to weaken the finished container appreciably; reasonably smooth and uniform surface finish required." (49 CFR 178.33-6(a))

"Circumferential seams: By welding, swedging, brazing, soldering, or double seaming." (49 CFR 178.33-6(b)(1))

"Side seams: By welding, brazing, or soldering." (49 CFR 178.33-6(b)(2))

"The ends shall be of pressure design." (49 CFR 178.33-6(c))

In plain English

This rule is about making sure that inner nonrefillable metal receptacles are made correctly, so they can safely hold hazardous materials. The manufacturer has to use the right tools and methods to make the containers uniform and free of defects. The seams have to be made in specific ways, like welding or brazing, and the ends have to be designed to handle pressure.

What to do

• Ensure that manufacturing processes and appliances are designed to produce uniform containers.
• Remove dirt and scale as necessary to prevent defects.
• Inspect containers for any defects that could weaken them.
• Use approved methods for making seams, such as welding or brazing.
• Design ends to withstand pressure.