![]() ![]() The ones I use most are 1.5" sch40 (pronounced 'schedule 40' and it refers to the thickness of the wall), which is something like 1.92" OD and. You basically need a pipe size table to know what the hell it is. Pipe sizing is odd, as it is a carryover from 'old times'. The ASTM-A53 pipe is also very similar to many of the HREW/ERW tubing standards. Places like Homedepot will probably sell ASTM-A53 pipe, but they may not, go to a real steel yard and you will get the correct type (they typically will not carry any non standard steel pipe as their customers have no use for it). Pipe that is built to a standard will have that inked down the length of it, or tagged, or bundled. ![]() I don't want to talk about that, because there is a lot of them, and while some are useful and many are not (you can buy T-304 stainless pipe, it's useful for some things, but pretty irrelevant to this conversation). Steel pipe also comes in other standards for other applications. Note, these standards are not as strong as DOM, which is about 100% stronger, depending on exact grade. ASTM-A53B is actually stronger than A37 by some 10-15%, IIRC. You probably see A37 steel in use all the time as angle iron, flat bar, channel, H beams (W-flange), and many other structural steel shapes. ASTM-A53 standards are for structural rated pipe that is made from carbon steel, and they spec very similar in mechanical properties to A37 steel. If we were talking ABS or PVC, yeah, sure. Terrible generalization and pretty much just 'wrong.' It's generally pretty soft (makes for easy threading) and while it can support some load, it's not the best for something structural. ![]() Pipe is only intended to support it's own weight, the weight of the contents, and a certain amount of internal pressure. ![]()
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