Regarding the issue of pipe wall thickness
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For a DN350 pipe, the outer diameter is 355.6. Does this outer diameter include the wall thickness of the pipe?
Is this 5.6 the wall thickness of the pipe? However, the wall thickness of a pipe changes depending on the pressure rating.
No, the wall thickness is determined by the pipe grade; you can find out the wall thickness by checking the grade of the pipe
DN350 is merely the specified outer diameter of the pipe; the wall thickness is determined by the pressure rating of the pipe wall, which is generally indicated using SCH. References can be made to ASME SB36.10 or SB36.19 standards
Are all the pipes 10 inches in diameter with the same pressure rating? One is made of carbon steel and the other of stainless steel; are their wall thicknesses the same?
They should be different; the materials are different, and the allowable stresses vary.
The outer diameter of pipes includes the pipe wall thickness. If the wall thickness grade used is SCH, then the wall thickness is the same for the same DN and the same SCH; this can be found in ASME B36.10M/ASME B36.19M. The wall thickness grades for stainless steel are followed by an S, so they differ from those of carbon steel. If you are using PN, since domestic standards do not specify what wall thickness corresponds to each PN grade, the outer diameter and wall thickness associated with DN and PN in a particular project are determined based on that project’s pipeline grade table. The complete project design document includes a pipe grade table that specifies the outer diameter and wall thickness corresponding to the DN/PN values for this project. If it is a small project without a pipe grade table, it is recommended to specify the wall thickness directly. Different materials have different grade numbers in the pipe grade table, and their outer diameters and wall thicknesses are not necessarily the same.
DN is the nominal diameter, and the outer diameter value includes the wall thickness. For the same type of pipe, if the size specifications are identical, stainless steel and carbon steel pipes can still differ from each other.
DN350 denotes the nominal diameter of the pipe; the outer diameter of 355.6 is expressed using φ or Do. For DN350, there are two common values for the outer diameter: φ355.6 and φ377； For example, φ355.6×8,8 indicates the wall thickness
Nominal size is 350, actual outer diameter is 355.6; there is no information on wall thickness available here
For different pipes, the pressure wall thickness varies. You can take a look at GB/8163; this is the standard for seamless steel pipes used in conventional fluid transportation