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PN20 and PN50 Flange Dimension TemplateHelpful Member! 

gvalves0164 (Mechanical) (OP)
17 Jan 12 8:25
Is anybody aware of DIN Flange drilling Template Spec for PN20 and PN50 Flanges?  DIN 1092-1 includes all but PN20 and PN50. I'm Designing Valves to meet ASME Class 150, 300 and 600 and they must also meet equivalent PN20, PN50 and PN100. PN100 dimensions in DIN 1092-1 are not the same as ASME Class 600, which leads me to believe PN20 and PN50 are not as well. Exhaustive web search has left me empty, with only indications that PN20=Class150; PN50=Class300 and PN100=Class600. From results of Dimensional data from EN1092-1 for PN100, only Pressure conversion is equal (ie. PN50 bar= 725 psi, approx. equal to CWP of Class300...etc).  
Helpful Member!  micalbrch (Mechanical)
18 Jan 12 4:25
Why don't you beleive the answers you received in your first post in the ISO Standards & Certification forum? Or did you exhaustive internet search lead to something else? Did you find a serious website which told you that PN 20 and PN 50 flanges acc. to ISO are available?
gvalves0164 (Mechanical) (OP)
18 Jan 12 7:43
ISO 7500-2 contains PN20 and PN50 for Cast Iron Flanges. Based on this I would assume that the same should exist for Alloy Steel Flanges. However, after sbmitting my post, the verbiage  in ISO-7500 would appear to apply to Alloy Steel flanges as well. These DIN and ISO standards are a bit confusing. Want as much input as possible before trudging ahead with design. Please don't take it personnally.

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