div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: BS5261 EN - Tecofi · BS 5261 AH77 General use : Chemical industries petrochemical industries Construction according to EN 12516-1 ISO PN16 RF flanges according to EN 1092-1 src=https:reader034fdocumentsusreader034viewer20220421085e881c482889dc55f225c319html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv