Why are there no flange dimensions for PN10 flanges of HG20592 from the Ministry of Chemical Industry with a diameter of over DN600?
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This post was last edited by luoshirong on 2021-4-1 10:28. Why are there no flange dimensions for HG20592 flanges with PN10, for DN600 and larger? Where can I find the data for DN600 and above, and what is the basis for it? Please let the expert know. It refers to plate-type butt weld PL PN10 DN600 and above, not necked butt weld WN; I saw the data for necked types on the following pages. Another question: What is the standard number corresponding to the flange data shown in the figure below? I earnestly request help from experts to provide the standard number (the flange manufacturer provided the data, but couldn’t indicate the corresponding standard).
Some of the data is available; flip to a few pages later. There is still data on the overall flanges for sizes above PN10-DN600, though
Do you mean the blind plate data? Can I refer to this? I mainly want to check the thickness of the Flange. I checked through it but didn’t see it
Refer to page 10 of HG20592: there are dimensions available for butt-welded flanges of PN10 for sizes above DN600; flat-welded flanges of PN10 for sizes larger than DN600 are not recommended.
Plate flat welding flanges in accordance with GB/T 9124.1 can be selected, with flange sizes up to DN1200
I did see 9124, but the customer requires that the flange standard be that of the Ministry of Chemical Industry. The flange manufacturer did provide the data, but it was unable to give the corresponding standard number; it only said that these values are sufficient.
The PN10 specifications provided by the flange manufacturer correspond to those in GB/T 9124.1; it is recommended to negotiate with the customer to use GB flanges instead. Given that plate flanges are typically used in conditions of normal temperature and low pressure, and that the pressure rating of GB flanges at normal temperatures is slightly higher than that of HG flanges, this should be an acceptable solution.
According to the national standard 9124, the flange thickness for PN10 DN1000 is 44/38 mm, which does not match the 70 mm thickness shown in my screenshot either
You must have seen it wrong; a thickness of 44/38 corresponds to PN2.5, with a DN800 flange
I’m not mistaken, it’s indeed PN10
You mentioned plate flanges earlier, so why are you providing data for integral flanges?