sheet is wrapped around the mandrel, welded and then stepped through dies around the mandrel to size it. The mandrel is fixed to the beginning end of the tube/pipe forming process. That mandrel has to be attached at one end or the other to something it can't float in the middle of the pipe magically resisting movement and if it was at the finished end.where does the tube go? Most all pipe is formed from sheet, rolled, welded and with the case of dom is drawn over a mandrel and worked further to guarantee consistency. I would assume the "pipe" thought of as inferior in quality was water pipe made of mild steel and not carbon, tool, or chromium-molybdenum steel. it's how you can rip a bar of steel apart with your hands by bending it if you score it with a blade first. This is how a small scratch in the surface of a car part can cause it to fail. The external diameter of tubing is essential because stress is transmitted along a surface.īoth electrical and mechanical stresses are transmited at the surface which is why a 2" tube will support in compression and tension almost as much as a 2" rod. the only technical difference between pipe and tube is in how they are sized for engineering purposes, not the materials or workmanship.įrom an engineering perspective the inside diameter of pipe is fluid flow essential. Again, the difference is simple, it's how they are measured and what their intended uses are." Because they are consistent OD, they have predictable characteristics. By having a consistent OD they can vary wall thickness, changing the ID, to increase strength. Engineers see tubes and pipes with different eyes. Generally speaking, a tube will have a consistent OD and it's ID will change. In other words, a 1/2" high pressure pipe may need a 2" thick wall, but the ID will still only be 1/2" even tho the OD is 4.5".
Pipes have a consistent ID regardless of wall thickness. Tubes are measured OD or outside diameter because they are structural. Pipes are measured ID or inside diameter because they are vessels. A pipe is measured ID - a tube is measured OD. A pipe is a vessel - a tube is structural. The difference between a pipe and a tube is how they are measured, and ultimately what they are used for. More often than not, people guess it has something to do with the quality of the materials, but that's got nothing to do with it.
What's the difference between a pipe and a tube? I had to check the net for refeshing my memory but here it is in quotes I was in the dark about pipe/tube/and dom myself untill I studied it.
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