ASME/ANSI B16.11 Socket Welded Pipe Fittings

What are ASME/ANSI B16.11 Socket Welded Pipe Fittings?

ASME/ANSI B16.11 socket welded pipe fittings shall mean fittings conforming to American standards. Fillet welds are usually used in pipe fittings. The steel pipe is inserted into the socket part of the pipe fitting and reaches the position of the socket positioning step, and then welded in a circle along the socket end of the pipe fitting and the edge of the pipe. In contrast to butt welded fittings, receptacles are usually used for small diameter pipes, such as 2 inches or less.

Socket welded pipe fittings mainly include socket tee, socket elbow, socket four and reducing pipe fittings, which are widely used in household water, construction engineering, municipal engineering and chemical industry.

The fatigue strength of the socket is lower than that of the butt welded joint, which is caused by the rapid change of fillet weld and geometry. However, the cannula connector is still superior to other mechanical connections.

Tube fitting is a group of high pressure pipe fitting used in various industrial processes.

Analysis of advantages and disadvantages of ASME/ANSI B16.11 socket welded Pipe fittings:

Advantages of Socket Welded Pipe Fitting:

1) The pipeline does not need prefabricated grooves.

2) There is no need to calibrate spot welding, because the pipe fitting itself plays a calibration role.

3) Welding materials will not penetrate into pipe holes.

4) It can replace threaded pipe fittings to reduce leakage risk.

5) Fillet welds are not suitable for X-ray detection, so correct fit and welding are very important. Magnetic particle detection and penetration detection are often used in the surface detection of fillet welds.

6) Construction costs are usually lower than docking. The reason is that the assembly of slots and prefabrication of slots are unnecessary.

Disadvantages of socket welded pipe fittings:

1) The welder shall ensure that there is a 1.6mm welding expansion gap between the pipe and the shoulder of the socket during welding.

2) The existence of cracks in the welding gap and socket weld reduces the corrosion resistance or radiation resistance of the pipeline. When solid particles accumulate at the weld joints, it may cause trouble to the operation and maintenance of the pipe. In this case, full penetration butt welding is usually required for the entire pipe.

3) Cannula fittings are not suitable for high-pressure food industry. Due to incomplete penetration, there are overlaps and cracks that are difficult to clean up, resulting in false leaks.