Spezilla can produce 12000MM single length welded stainless steel pipe with only one longitudinal seam, see the following pipes we have supplied to USA customer.
Product: Welded Stainless Steel Pipe
Material: TP304/304L
Size: 16'' X 0.375'' X 33'0'' / 406.4 X 9.53 X 10058.40MM
Standard: ASTM A312