Large diameter stainless steel pipes are pipes with diameters typically exceeding those of standard or conventional stainless steel pipes. These pipes are designed to accommodate higher flow rates, heavier loads, or specific structural requirements: Large diameter stainless steel pipes typically have diameters ranging from 6 inches (150 mm) to over 36 inches (914 mm) or even larger. The exact size range can vary depending on the manufacturer and the specific requirements of the application.