Material of pipes and accessories
Thread Content
I’ve only been working with pipe design for a short time, and I have a question: if the pipes are made of 20#, do the elbows and other fittings also need to be made of 20#, and the flanges as well?
You understand correctly. A reasonable design should usually be like this
Under normal circumstances, the material of the fittings is the same as that of the pipes. However, the situation with flanges is a bit different; there are many types of flanges. The flanges for 20# pipes are generally made of carbon steel, but they are not necessarily 20# steel.
It should be like this; it needs to be unified.
The materials of fittings and pipes should be consistent with the medium.
That’s usually the case. . . It can also be used in special cases, but it must be made of the same material during design.
Thank you thank you thank you thank you thank you. . . . . . . . . . . .
In principle, that’s the case; generally, the grade of the flange should be greater than or equal to the material grade of the pipe
First, it is necessary to understand the concept of pipe grade. The pipe grade determines the main material used for the pipes – that is, the material for the pipes themselves, fittings, and flanges – based on the corrosivity of the medium at the design temperature. The pressure grade of the flanges is determined by the design temperature and pressure, while the materials for various components of valves are chosen based on the main material, the corrosivity of the medium, and other requirements. Therefore, it is impossible for the pipe to be made of 20# steel while the elbows are not made of 20# steel; the flanges, on the other hand, are made of cast steel. Thus, the material standards differ from those of the pipe, but the main material remains 20# steel.