How can you tell whether a fitting has been forged? Pipes and piping systems with tiny bores often make use of socket-weld and threaded forged fittings, both of which are kinds of pipe fittings (generally below 4 inches in diameter for Class 3000 and below 2 inches for fittings in classes 6000 and 9000). These fittings are produced by forging and machining solid steel, and they are available in a wide range of configurations, including elbows, tees, reducers, unions, and couplings. They are also known as solid steel fittings. The oil and gas socket weld and threaded fittings specifications are both included in the ASME B16.11 standard. Buttweld fittings that comply with ASME B16.9 are required if the pipe diameter is greater.
On the other hand, threaded fittings are screwed into the pipe, while fillet welds are used to join socket weld fittings to pipes.In circumstances in which sturdy and long-lasting connections are needed, socket weld fittings are employed. Even though 304 SS socketweld fittings have an exceptionally high level of dependability, installing them in a pipe network takes a very long time (due to the heavy workload caused by welding operations on small parts).
There is a wide range of sizes available for socket weld fittings, ranging from 1/8 to 4 inches, and there is also a wide range of strength classes, from 2000 to 9000.
The uses for socket weld fittings are:
- Steam
- Combustible liquids and gases
- Acids and potentially hazardous fluids
- Long-term service/installations
A butt welding connection fills the gaps between two devices that are beveled at 30 degrees.
THREADED FITTINGS
Threaded fittings are employed in less-critical pipe systems such as water distribution, fire protection, and cooling. Additionally, threaded fittings are utilised in low-pressure installations that are not vulnerable to vibration, elongation, or bending stresses. Threaded pipe fittings are not appropriate for use with fluids whose temperatures are not stable and remain in a continual state of change. This is due to the possibility that the connection might get severed due to frequent temperature changes.
The two primary thread types are BSP and NPT, which are incompatible with one another:
BSP Fittings
The abbreviation "BSP" refers to the "British Standard Pipe," which may be further subdivided into two distinct types: BSPT (tapered) and BSPP (parallel). In this scenario, the threads are tilted at an angle of 55 degrees. BSP threaded fittings are used in the oil and gas sectors on a far more infrequent basis than NPT threaded fittings.
NPT Fittings
In the oil and gas sector, the NPT standard for threaded forged fittings is the one that is used the most often. NPT is an abbreviation that stands for "National Pipe Taper." NPT threading, which is covered by the ASME B1.20.1 standard, has thread flank angles of 60 degrees, while BSP threading has thread flank angles of 55 degrees.
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