Stainless Steel Pipe Fittings factory Stainless Steel Concentric/Eccentric Reducer Reducers are applied, to change from pipe diameter in one direction. Standard, there are 2 possibilities, the concentric reducer, which is usually used in vertical pipe lines, and the eccentric reducer which is used in horizontal pipelines. TF & BF On an isometric view, in a horizontal line, an eccentric reducer must be declared, or the flat side at the bottom or top must be assembled. Perhaps, you have ever seen on a drawing, the abbreviation "TF" or "BF". This stands for respective "top flat" and "bottom flat" For example: Bottom flat eccentric reducers are often used in pipe racks to keep the pipeline at the same elevation, after a pipe size change. When a concentric or a flat on-top eccentric reducer in a pipe rack will be used, the support detail, probably change. Top flat eccentric reducers are often used in pump suction lines to avoid the ac****ulation of gas pockets. Eccentric reducers can avoid small "dead spots" that exist behind concentric reducers. Some draughtsmen also specify the size difference T between the centre lines.
http://www.zcstainlesssteel.co....m/stainless-steel-pi
