Chris Mc Posted October 21 Share Posted October 21 A question for the pipe fitters out there or anyone else in the know. In prefabricated mild steel flanges at what size diameter does the flange change from a 4 hole one to an 8 hole one, I am of the belief it's between 3" and 4" Just want clarity on it Thanks Link to comment Share on other sites More sharing options...
JohnMo Posted October 21 Share Posted October 21 It depends on pipe schedule (how thick it is) as pipe size is stated in nominal dimensions. Take a look below. https://www.valvesonline.co.uk/free-flange-tables?srsltid=AfmBOoqG7T3lPn0niO-55d0uNIKyHb0fiw_B9U79sEyC9H4moDn7wnUL Link to comment Share on other sites More sharing options...
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