Mechanical joints called Stub Ends have two parts. The Stub End is essentially a short length of pipe with one end flared outward and the other end ready to be welded to another pipe of the same material, Nominal Pipe Size (NPS), and wall thickness.
Short Stub End are butt weld fittings that are used as an alternative to welding neck flanges to produce flange connections. The use of stub ends has two benefits: it can lower the overall cost of flange joints for piping systems made of high-grade materials, and it can speed up installation because the lap joint flange is turned to make it easier to align the bolt holes. In industries where the pipe sizes vary, this is the ideal approach to connect the pipes. Various features can be found on the stub ends that are used in various sectors.
In contrast to Long Stub Ends, which have an enlarged hub length, Short Stub Ends have a smaller hub length. They serve as rotating backup flanges and are an alternative to welded flanges. Stub Ends are available in three standard sizes: short and long patterns of ANSI B16.9 or MSS SP43. For flanges in class 300 to class 600 range and higher, short pattern stub ends are typically used. In addition to these conventional forms, end-users and contractors might ask for stub ends in non-standard lengths to meet the needs of a particular project. Of course, there will be an additional charge for this.
The oil and gas pipeline, plumbing, the food processing industry, structural pipe, power plants, the paper and pulp industry, heating, water supply systems, the fabrication industry, general purpose applications, the nuclear industry, research and development, mega projects, and the defence and development industries are all industries that use alloy steel short stub ends. In actuality, 90-degree elbows are used in all crucial applications due to their special steel quality.
