The issue of matching the pressure rating of the pipeline with that of the flange
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This post was last edited by “Such a Similar Name” on February 8, 2018, at 08:09. According to the supplementary provisions for Class A1 fluid pipelines in the “Code for Design of Industrial Metal Piping”, “the flange rating for Class A1 fluids (extremely hazardous substances) must be no less than 2.0 MPa”. According to this requirement, the flange needs to be of 2.5 MPa grade. But the pipe grade is 1.6 MPa, is that okay?
The grades are different, and the wall thicknesses vary as well – how can welding be carried out? It is best to choose the same high grade, with the pipes following the flanges
First of all, your claim that the pipe grade is 1.6MPA is incorrect; pipes do not have a pressure grade – they only have a wall thickness grade, such as SCH40. Secondly, the wall thickness of the pipe has no relation to the pressure rating of the flange; for example, a pipe rated SCH40 can be fitted with either PN25 or PN16 flanges. Finally, the wall thickness class of a pipe is determined by various factors such as pressure, temperature, and corrosion conditions, whereas the flange pressure class is generally determined only by pressure and temperature.
The wall thickness of the pipe depends on factors such as pressure, temperature, and corrosivity, and has no direct relation to the pressure rating of the flange.
The wall thickness of the pipe has no relation to the pressure rating of the flange; for example, a pipe rated SCH40 can be fitted with either PN25 or PN16 flanges.
The answer on the 3rd floor is perfect, so there’s no need to repeat it here~~~~~~
It’s not perfect at all – what grade is L1B M1B on those pipe designations, if it’s not the pipe grade? They asked you about the pressure grade, not the wall thickness grade
L1B is a grade that is determined through human design; the pipeline itself does not have a grade, as long as its pressure-bearing capacity is sufficient.