A pipe attachment detail with a socket and counter bore is called a socket weld flange fitting. In this scenario, the pipe can be inserted into a recess in a flange or fitting. Seal welds of the fillet type are used to connect the valves or piping to the other pipe sections. Socket weld fittings are an excellent option in a number of situations. When building your pipeline project, it is very important to take the advantages of high permeability integrity and strong structural strength into account.
Socket welding fittings can be utilised in a wide variety of industrial processes and are often utilized for low – to – medium pressure in tight locations. Used where piping has been determined to be permanent. Additionally, they have been created in a way that offers qualities of good flow. Also used to convert to different dimensions and in connection with ASME pipe. Reducers, tees, elbows, and other socket weld pipe fittings can be used at pipelines to transport expensive, flammable, or poisonous products where there is no chance of leaking.
Similar to butt weld fittings, socket weld fittings come in a number of materials depending on the type of material used, such as stainless steel pipe fittings, alloy steel flanges, and carbon steel flanges. It consists of flanges, couplings, reducers, reducing tees, socket weld inserts, socket weld elbows, etc. depending on the applications.
For the preparation of an insert weld, the pipe’s ends frequently do not need to be finished adequately. Most of the time, temporary tack welding doesn’t require alignment. The reason for this is that the fitting principle would ensure that it has a good alignment. The pipe’s bore will prevent the socket weld insert from penetrating. Construction costs can occasionally be less than butt-welded joints. It lacks the precise fit-up bevel specifications due to the removal of specialised equipment.
The expansion space between the pipe and the socket shoulder must be a specific distance, often close to 1.6 mm, according to the welder’s instructions. With some media, the expansion gap and interior fissures in the socket weld mechanism may encourage corrosion. They have been regarded to be less suited for harsh or hazardous applications as a result of this rationale.
In the food industry, these kinds of fittings would be inappropriate for use with ultra-high hydrostatic pressure. The addition to prevent full penetration could be the cause. Additionally, it would leave holes and cracks that would be challenging to clean.
Application & Installation
The strength resistance of a socket weld is often lower than that of butt weld fittings. Therefore, when available, SW fittings are utilised mostly for smaller pipelines with widths of NPS 3 or below.
Installing SW fittings is rather straightforward. It also permits thermal expansion because the socket typically needs about 1/6 inch of the gap at the base of the gap in order to be accessible. The fitting’s fillet weld could be cracked by overstressing issues brought on by the gap, though. Due to crevice corrosion, socket welding has also been discovered to be difficult in corrosive fluid service. The application’s medium must be taken into account.