Flange standards
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I have a few questions: 1. Based on 20592-2009, I specified the material for the flange as ‘200-10’... Should it be manufactured according to the new standards as a DN200, PN10 flange? (But in reality, the flange that arrived seemed to be of 10.0 MPa grade.) Is this mistake related to my design? Was I not clear in my description? 2. According to the manufacturer’s data for flanges, the bolt hole spacing for DN300 is 405; whereas per the standards, it is 400 for PN10 and 410 for PN16. How should the flange grade be selected in this case? Can the hole spacing of 405 be specified, and can the manufacturer produce it?
Write down the standard number; if you’re still not sure, include the organization name! It’s all because of the standards
Reply to 1# From Heaven: Many things cannot be handled according to standards. Your method of marking might be correct, but it’s another matter when it comes to the workers at the flange factory who need to understand what’s being indicated. Our goal is to ensure that workers can understand why a DN200 PN10 marking is used – after all, anyone can understand that.
Well said; there are too many standards, it’s all too complicated – really annoying
Currently, the 97 version is PN1.0, while the 09 version is PN10; both are of the PN type. The unit difference is ten times. This matter!
It has not been answered yet whether it can be manufactured with a hole pitch of 405
If the customer requests 405, you can first talk to him* to see if it’s a mistake in the request. If it’s not a mistake, then we have no choice but to follow the customer’s request.
Both on-site measurements and the drawings indicate 405. I just don’t know if the manufacturer is capable of producing something like that.
Reply to 8# From Heaven: As long as you have the blueprints, it’s possible to manufacture anything no matter its size. Hehe, it’s just a matter of whether materials can be saved; custom flanges can be made
For non-standard flanges, the specific dimensions need to be agreed upon with the manufacturer in advance
Reply to 8# From Heaven: It’s okay, don’t worry