I agree with Neal. Years ago, when I worked in erection of heavy plants, we used the Diameter-Meters (instead of Diameter-Inches) to monitor production of pipe erection and welding, i.e., how many meters of pipe of such diameter were erected and welded per day. Several Diameter-Meters parameters were available for different materials (carbon steel, alloy and stainless) and for different Schedule numbers.
Giovanni S. Crisi
Sao Paulo - Brazil