| http://www.w3.org/ns/prov#value | - That the difference is less than 2mm is not surprising, since both types of flange are machined from the same forgings.While you correctly point out section 6.4.3 indicating that lap joint backing flanges shall be furnished with flat faces, we are not talking about furnishing flanges for sale here: we are talking about modfiying an existing B16.5 flange (i.e. one that can be had from stock) to a d
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