Issues with the flange sealing surface dimensions of DN350.
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Let’s take a look at a few standards first. First: HG/T20592 DN350 PN16 – the value of d for the sealing surface is 428. Second: GB/T9119 and other relevant national standard flanges, DN350 PN16 – the value of d for the sealing surface is 438. Third: EN1092-1-2005 DN350 PN16 – the value of d for the sealing surface is 438. The problem is that both HG/T20592 and GB/T9119, among other national standard flanges, were developed with reference to EN1092-1-2005; therefore, the values should be consistent. In the current situation, regarding the dimension of the sealing surface d value, only the data for DN350 PN16 differs between the national standards, international standards, and British standards. Moreover, the errata sheet of HG/T20592 also did not modify the data here. Was it intentional? Please let all fellow sailors discuss it.
The issue here is the omission of corrections other than those that have been corrected; referring to ISO, EN, and DIN is correct
So careful; by checking the gasket size, it shouldn’t be 428 either.
This error has never been corrected; could it be that no one noticed it? ?
The outer diameter of the gasket is 444, while the sealing surface is 428 – this difference is quite large.
Adding a protruding surface with an outer diameter of 6–8 for the gasket’s outer diameter seems to be a reasonable approach. Comparing this to DN300-16: 378 + 6 = 384; for DN350-16, it’s (438) + 6 = 444. It’s easy to see that 438 is a fairly reasonable value
Just go with it; either ask the editor at the publishing house
I didn’t notice it when correcting the errors. . . . :Lol, 438 is reasonable for this place. .
I’ve learned it now; I didn’t pay attention to the standards before, but generally, when I notice any discrepancies with those standards, I go by what’s actually happening on site!