Regarding the actual dimensions of galvanized steel pipes DN100
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For the technical renovation of the project, a batch of galvanized steel pipes was purchased, with a specification of DN100. Upon arrival and inspection, a steel tape measure was used to check the diameter, and it seemed that the diameter of these galvanized steel pipes was not 100 mm. I’m not sure if this is the correct way to measure materials for inspection; could it be that the supplier has used lower-quality materials to cut costs?
DN100 is the nominal diameter; check the standard
The inner diameter is less than 100 mm, while the outer diameter is slightly greater than 100 mm; this is related to the wall thickness of the tube
Check which standard the pipe follows, and then search for relevant data based on that standard.
The engineering diameter is not the inner or outer diameter; rather, it is a nominal diameter, and the inner and outer diameters are determined based on standards regarding the pipe type and wall thickness.
I haven’t heard of such a specification for DN100. GBT 3091-2015 Welded steel pipes for low-pressure fluid transport:
Hey, it seems like the table you provided is incorrect. That galvanized steel pipe is likely meant to be used as a protective tube for buried cables or something similar; galvanized steel pipes are somewhat different from ordinary steel pipes. The table provided on the 6th floor seems to be more reliable!
Well, that’s not clear; all the galvanized pipes we use are made in accordance with this standard.
His approach is correct; this is applicable to both welded pipes and galvanized pipes
The diameter should be either 114.3 or 114