What is a flange or backing ring? What does Table D or Table E mean?
A flange or backing ring are components of a joining system, using (normally) metal plates and bolts. They can be dismantled, so are often used for installing pumps or valves in pipelines, which need to be accessible for maintenance at a later date. Flange tables (such as Table E) are Australian standards that define all the parameters of a flange (like thickness, number of bolt holes, thickness of bolts, and PCD).
