Dear Colleagues, I am working to grasp the implications of the PED (Pressurized Equipment Directive) for our equipment.
I have managed to wade through the articles and determine which Annex II tables I should be concerned with. I'm stuck on determining the "DN" value for tubing in our equipment. I gather from Article 1, 2.6 that DN is Nominal Size, and is a value assigned to piping system components. I can see from the web that some valve manufacturers provide the DN value for there products. Actually, I could only find two online hits for DN in a product spec. Our equipment is designed mainly from North American components. I doubt our suppliers "DN rate" their wares. So a couple of questions..... 1. 30 psi (2 bar) pneumatic systems in equipment for driving air cylinders and air valves and the like fall under the PED according to Article 3, 1.3, second indent (group 2 liquids)....correct? 2. DN is a volume-ish number. For example, if you have a valve with DN=10 and a length of tube connected with DN=50, then the system total is DN=60....correct? 3. While valves seem to have an unqualified DN (i.e just DN=100) rating I should expect to find tubing rated at so many DN/meter (or foot)....correct? 4. Knowing the diameter and wall thickness of a piece of tubing, how can I calculate the correct DN per meter? Thanks for any help Lauren Crane Senior Compliance Engineer Eaton Corporation --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
