We had an inquiry today about the 3364 with steel billet fluid ends and flanges and what is the appropriate size. As the information is not on the website we had to research to find out what would be the correct flanges for the pump. What we found was that currently the recommendation is that the pump be equipped with 2" 600 lbs ANSI suction flanges and 2" 150 lbs ANSI discharge flanges. We do not believe that the flanges are cast with the steel bodies any longer, but are instead welded and machined on to a steel billet after the finis work is done on the billet itself.
See the link associated with this posting and refer to the 2 pump figures on the right side of the page.