dn/pn gaskets for inches/class flanges dn/pn gaskets for inches/class flanges Hugo87 (Materials) (OP) 8 Oct 15 14:14 It is adequate to use gaskets mark with dn/pn on flanges with flanges mark with inches/ pressure class? RE: dn/pn gaskets for inches/class flanges racookpe1978 (Nuclear) 10 Oct 15 17:06 What specific sizes, pressures, temperatures and fluid spec's are the gaskets rated for? Many times, they can be substituted for one another. Other times, they cannot be substituted. RE: dn/pn gaskets for inches/class flanges Hugo87 (Materials) (OP) 10 Oct 15 19:10 The project where I am working at has not started the construction stage yet. Right now they just started receiving materials to prepare for next year. It is my second week at this site and they have not provided me with the specs. At this time I dont have the information where the material will be allocated to. The gaskets are dn 50 pn 10/40, flanges are 2" 150# I will appreciate any information RE: dn/pn gaskets for inches/class flanges racookpe1978 (Nuclear) 11 Oct 15 13:38 Same answer applies. UNTIL you KNOW the service conditions (pressure, fluid properties, temperature, and ratings of the pipe and flanges), you CANNOT specify nor purchase the gaskets that will (1) fit between the gasket faces of the flanges and (2) protect the fluid and your customer from the pressurized fluids/gasses/steam/HP air inside the pipe.. You're trying to make wrong spec'ed gaskets (metric/DN to ANSI/inches) "fit" the hole around the pipe. That's the wrong question. And the wrong answer will kill people in future. Maybe. Or maybe not. Maybe these gaskets are way too strong, too thick, and too expensive. Maybe they'll melt through in 10 minutes. Or maybe not. You don't know yet. RE: dn/pn gaskets for inches/class flanges Hugo87 (Materials) (OP) 11 Oct 15 19:33 Thank you racookpe.