a-6 Manufacture.

(a)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.#

(b)Seams when used must be as follows:#

(1)Circumferential seams. By welding, swedging, brazing, soldering, or double seaming.#

(2)Side seams. By welding, brazing or soldering.#

(c)Ends. The ends shall be of pressure design.#