can some one explain pipe sizes to me?

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I know all the smaller pipe dimensions are pretty straight forward,It's all measured by i.d.Then you get to the bigger stuff and some goes by i.d. some by o.d. And then big plastic pipe has diferent numbers.And what's the difference in pipe and casing?I am sure there is rhyme and reason to it but I just haven't caught ontractor,loader.dozer,backhoe,and all the tools to keep em movin
Reply:Pipe is used for plumbing purposes and is measured by id. For example black iron, galvanized iron, copper, ductile iron and plastic. Plastic is refered to the thickness of the wall by schedule, ie; schedule 40, 80 &120.Pipe for electrical also refers to the id. For different applications you have different thickness', ie; thinwall for interior, and EMT for underground. (I think)TUBING, used in structural and fabrication as in building a trailer is measured od. If you look at the wall thickness you can calculate the id which helps if you want to make a boom for example, where you will be putting another tube inside of the tube. Other than that, od is the important number.I look at it as, if it's "intended" purpose is to have something going in or thru the inside of it, it is pipe measured by id. I stress intended, because I will use EMT electrical pipe for something like building a 2 wheel cart. It is readily available and cheap from Home Depot."Where's Stick man????????" - 7A749"SHHHHHH!! I sent him over to snag that MIC-4 while tbone wasn't looking!" - duaneb55"I have bought a few of Tbone's things unlike Stick-Man who helps himself" - TozziWelding"Stick-man"
Reply:Originally Posted by 1-800minerI know all the smaller pipe dimensions are pretty straight forward,It's all measured by i.d.Then you get to the bigger stuff and some goes by i.d. some by o.d. And then big plastic pipe has diferent numbers.And what's the difference in pipe and casing?I am sure there is rhyme and reason to it but I just haven't caught on
Reply:casing is a structural cylindrical wall used in oil drilling.
Reply:EMT stands for "electrical metalic tubing".It is thin wall conduit usually used indoors.I think it can be used outdoors if the right fittings(compression fittings)are used.I'm pretty sure running emt underground is a code violation.PVC is used for underground wiring.Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:The way it was explained to me, years ago, Metal pipe is measured and ordered using ID until your dealing with 12" and larger, then it's OD. That has served me well, but....there are many bastard sizes out there and....they are mostly oilfield tubing and piping. Pipe used in construction at the petro-chemical refineries and compressor stations and even the production end of the oilfield use 2",3",4" etc. Schedule 20, 40, 60, 80, etc. The drilling end uses 2 3/8", 2 7/8", etc. tubing but with the shed.40 thickness. Casing is used on the drilling size in the larger sizes and some of it is shed 40 also, but some is thicker and some is thinner. Usually when ordering casing the OD of pipe over 12" is used (ID under 12") but with a wt. per foot for the thickness designation. It gets real complicated unless you've got the book with the proper numbers used in the oilfield pipe & equipment supply. Now, with all that said, let me say I've been out of all that end of it for going on 15 to 20 yrs, so it has probably changed some what. I have used very little in the way of electric or plastic, so what's above is probably correct.Only when the last tree has died and the last river has been poisoned and the last fish has been caught will we realize we cannot eat money.                                         -Cree Indian ProverbSA 200 LincolnVictor Torches
Reply:Can't tell you a thing about tube or casing but pipe sizes are what you would call "nominal" I.D., that is a prechosen I.D. that is around or near the stated size with an O.D. that remains consistant throughout all the schedules. Controlling the O.D. and allowing the I.D. to be the variable allows all fittings to work arcross any given stated pipe size. Once the O.D. and nominal I.D. was/is established for each pipe size the I.D. gets smaller with each increase of wall thickness. As an example, a 2" pipe of any given schedule may not necessarily be exactly 2 inches, but it'll be close plus or minus. http://www.engineersedge.com/pipe_schedules.htmLast edited by Sandy; 06-05-2010 at 04:39 PM."The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life." -Theodore Roosevelt
Reply:Pipe is not measured by ID.  It is measured by nominal size.  1" nominal pipe will have an OD of 1.315".  Sch10 1" pipe has .109" wall thickness, Sch40 has .133" and Sch80 .179".  Three 1" pipes all having different ID's; 1.097", 1.049", and .957" respectively.  The reason for this is so that any piece of pipe can be threaded and used with standard fittings, regardless of wall thickness.  If pipe was measured by ID, then Sch40 would have a different OD than Sch80 in every size, meaning that there would be different threaded fittings for each schedule of each pipe size.  OD matches nominal size from 14" on up.  Up through nominal size 12", the OD will be larger than nominal (12" pipe has 12.750" OD), but the OD of a given pipe size will remain constant regardless of what schedule a given pipe is.  14" pipe will have an OD of 14".edit: Chart here: http://en.wikipedia.org/wiki/Nominal_Pipe_SizeLast edited by Static-XJ; 06-05-2010 at 04:55 PM.
Reply:Static-XJ has the straight answer on regular commercial pipe. When you encounter oil field tubing it gets more complicated as it is generally referred to by it's outside diameter such as 2 3/8", 2 7/8", etc. It is still the same as regular pipe but is usually schedule 80 wall thickness. It is also common to hear it referred to as 2", 2 1/2", etc. Just something you get used to hearing when working with it. Oilfield tubing also has upset ends so the wall thickness stays the same under the threads.
Reply:Posted by Oldtimer:Static-XJ has the straight answer on regular commercial pipe.
Reply:wow! my confusion before is completely eradicated by the confusion I am suffering now!So if it don't screw together then weld it?Yes that did help.Now i just have to remember all of it.tractor,loader.dozer,backhoe,and all the tools to keep em movin