Don: I'd rather not. This subject is very specific and full of exceptions, trade names, and new developments. To help, here is an attachment, presented on this forum before, that hints at the complexity of the issue. Working with experienced plumbers in my house projects I was amazed talking to them how little they new about the pipe/tube product they had in their hands.
There used to be a respectable trade - called the pipe fitters - that hardly exists today. At least I do not know of any parent that would have their child training for that formally. The existence of the many nominal inches blurs the picture, as is the fact that the metric world uses some of them also. Parallel with their hard metric sizes, that is. Some are inch, or nominal inch, soft converted sizes designated in mm or in symbols like "G", or in the name of the company that brought it to the market. With "fittings" fitting, there is no need to know the dimensions. One justification for the mess. I, or anyone, can look up the ANSI (ASTM, ASME, SAE,...), DIN, ISO, CEN, .... standards if they are free on line (many are not free), and get the details. I guarantee, a most boring task for the uninitiated. Stan ----- Original Message ----- From: Hillger, Don To: [email protected] Sent: 09 Jan 30, Friday 13:53 Subject: FW: [USMA:42628] Copper Pipe Sizes Stan, Seems like you should know the answer to this? Certainly there are standards for copper pipe in inch sizes, so that one company does not call it 1/2 inch and another 3/4 inch??? I understand that those sizes are only names, but certainly those names are standardized. I believe, however, that 1/2 inch may mean different things for different kinds of pipe, steel vs. copper. Hoping you might clarify, since I think Mike's last statement is wrong. Don From: [email protected] [mailto:[email protected]] On Behalf Of Michael Payne Sent: Friday, 2009 January 30 10:50 To: U.S. Metric Association Subject: [USMA:42628] Copper Pipe Sizes I promised to measure the copper pipes I have in my home, done with a micrometer at 20 C. 3/4" pipe is 22,2 mm OD. 19,9 mm ID. 1/2" pipe is 16,0 mm OD. 13,8 mm ID. 1/4" pipe is 9,7 mm OD. 7,9 mm ID. Seems like the wall thickness on this pipe is very close to 1 mm. None of the inch sizes have any correlation to the actual "nominal" size. Allowing for manufacturing tolerances, these pipes are as near to whole millimeter sizes as is possible. When you go into a hardware store and try to find fitting that are labeled 1/2"or 3/4", etc. The actual size bears no relationship to actual size which can be very frustrating if you measured something at home and expect this to match what they have in the store. A 3/4" fitting from one manufacturer will fit the 1/2" fitting from another manufacturer, so each company is choosing any definition they want for the named size. Mike Payne __________ Information from ESET NOD32 Antivirus, version of virus signature database 3813 (20090130) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3813 (20090130) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
P,T,T,P,F,P,H,D.doc
Description: MS-Word document
