BS ISO 9803-2:2020 pdf free.Vacuum technology一Mounting dimensions of pipeline fittings一Knife-edge flange type. BS ISO 9803-2 1 Scope This document specifies mounting dimensions for vacuum pipeline fittings (elbows, tees and crosses) of knife-edge flanges for nominal bores from 16 mm to 200 mm. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references,...