A pipe fitting is defined as a part used in a piping system, for changing direction, branching or for change of pipe diameter, and which is mechanically joined to the system. There are many different types of fittings and they are the same in all sizes and schedules as the pipe.
Fittings are divided into three groups:
Butt weld fittings whose dimensions, dimensional tolerances et cetera are defined in the ASME B16.9 standards. Light-weight corrosion resistant fittings are made to MSS SP43.
Socket Weld fittings Class 3000, 6000, 9000 are defined in the ASME B16.11 standards.
Threaded, screwed fittings Class 2000, 3000, 6000 are defined in the ASME B16.11 standards.
Applications of Butt weld Fittings
A piping system using butt weld fittings has many inherent advantages over other forms.
Welding a fitting to the pipe means it is permanently leakproof;
The continuous metal structure formed between pipe and fitting adds strength to the system;
Smooth inner surface and gradual directional changes reduce pressure losses and turbulence and minimize the action of corrosion and erosion;
A welded system utilizes a minimum of space.
Butt weld Carbon Steel and Stainless Steel Pipe Fittings
Buttweld pipe fittings comprises of long radius elbow, concentric reducer, eccentric reducers and tees etc. Butt weld stainless steel and carbon steel fittings are an important part of industrial piping system to change direction, branch off or to mechanically join equipment to the system. Buttweld fittings are sold in nominal pipe sizes with specified pipe schedule. BW fitting’s dimensions and tolerances are defined as per ASME standard B16.9.
Butt welded Pipe fittings such as carbon steel and stainless steel offer many advantages compared tothreaded and socketweld fittings.The later are only available up to 4-inch nominal size whereas butt weld fittings are available in sizes from ½” to 72”. Some of the benefits of weld fittings are;
Welded connection offers more robust connection
Continuous metal structure adds to the strength of the piping system
Butt-weld fittings with matching pipe schedules, offers seamless flow inside the pipe. A full penetration weld and properly fitted LR 90 Elbow, Reducer, Concentric reducer etc. offers gradual transition via welded pipe fitting.
All buttweld pipe fittings have beveled ends as per ASME B16.25 standard. This helps create full penetration weld without any extra preparation needed for the butt weld fitting.
Butt weld pipe fittings are most commonly available in carbon steel, stainless steel, nickel alloy, aluminum and high yield material. High yield butt weld carbon steel pipe fittings are available in A234-WPB, A234-WPC, A420-WPL6, Y-52, Y-60, Y-65, Y-70. All WPL6 pipe fittings are annealed and are NACE MR0157 and NACE MR0103 compatible.
Post time: Feb-16-2023
