Pipe schedule 40,80,160 wall thicknesses?

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I never dealt with pipe so please be forgiving with me here, okay so How come pipe is measure in schedules? How do i determine the wall thickness of a schedule pipe into a unit of measurement that i'm use to? I.E fractions such as 1/8.Lincoln pro core 125 14''chop saw7 inch grinder,2-4.5 inch grinders,electric die grinder.Half inch drillAnd alot of hand tools
Reply:Found this on the net "Schedule Number = 1,000 x (P/S) where P = internal pressure, pounds-per-square-inch-gauge (psig) and S = allowable fiber stress (ultimate tensile strength of the steel in psi)."
Reply:Because pipe is used to contain a medium that flows, while tubing is is rated more for structural. Small diameter pipe is all nominal sizes. you have to look the dimensions up on a chart. Wall thickness changes with different pipe size, even in the same schedule, since wall thickness needs to be greater for a larger pipe under the same pressure (although pressure ratings aren't constant among different diameters within a given schedule anyway).Last edited by MikeGyver; 12-27-2014 at 11:41 PM.Welding/Fab Pics: www.UtahWeld.com
Reply:Pipe schedule dimensionshttp://www.engineersedge.com/pipe_schedules.htm
Reply:nice answer fireman.    this isn't the answer to your question.   I bought a little paper back book that fits in your back pocket for 5 or 10 dollars.   I think its called "pipe fitters handbook".   its a great little book, w/ all the charts and dimensions for everything related to pipe imaginable.
Reply:External OD remains the same, wall thickness and ID change with the different schedules.  As stated above the pipe size number is nominal and means nothing, it's close to thhe ID of sch40. Any steel reference book will have the dimensions.  I believe the schedules are ASTM and should be rated for working PSI. Some catalogs call it STD, HD, XHD, XXHD etc. There is even sch10, which is the same ID but thin wall.
Reply:Originally Posted by flux core joeHow do i determine the wall thickness of a schedule pipe into a unit of measurement that i'm use to? I.E fractions such as 1/8.
Reply:I don't know what you are trying to do. If you want to weld pipe, and need to know the wall thickness to set your heat-then go to HF and buy a pair of their digital calipers. You can get a quick measurement to determine thickness. After doing this a few times you will remember the thickness of the various pipe schedules.You can also download a chart from the net that has the nominal thickness of the various schedule pipe. Tubing usually list the wall thickness-schedule pipe does not.