Attività

Steel pipe has been produced in the US since the early 1800s. Pipe is a hollow section with a round cross-section, primarily made for the transportation of products including fluids, gas, pellets, powders, and more. But steel pipes are used in a variety of ways. They are used underground for transporting water and gas throughout cities and towns. They are also specified in construction to protect electrical wires. Steel pipes can be strong, but lightweight. This makes them great for bicycle frames. They are also used in the making of parts for automobiles, refrigeration units, heating and plumbing systems, flagpoles and street lamps, just to name a few.

The most important dimension for a pipe is the outer diameter (OD) together with the wall thickness (WT). OD minus 2 times WT (schedule) determines the inside diameter (ID) of a pipe, which determines the liquid capacity of the pipe. In our industry, when we talk about pipe, we tend to call out an (ID) and schedule, like 2 inch schedule 40, or 14 inch extra heavy. Examples of walls or schedules are Sch. 40, Sch. 80, Sch. Standard (STD), Sch. XS/XH, and Sch. XXS. Most pipe is sold in 21 or 42 foot lengths.

What is Steel Tube?

The word tube refers to round, square, rectangular, and oval hollow sections that are used for pressure equipment, for mechanical applications, and for instrumentation systems.

Steel tubing can be made from various raw materials, like iron, carbon, manganese, vanadium, and zirconium. Like pipe, tubing can be produced as either seamless or welded. Seamless tubing is a solid block of steel that is rolled into a round shape and then pierced and stretched into its final length. Think of having a wad of play dough and rolling it into a cylinder. Then push your finger through the middle and make it longer with the extra dough. That’s how it’s produced, but it’s hot and spinning and completely done with machines. Welded steel tubing, on the other hand, is made from the coil. The coil is slit and then rolled up into a round shape and the ends are welded together. From there, the tubing can simply be cut to a certain length as round tubing, or it can be further deformed into other shapes, such as square, rectangular, oval, etc.

What’s the opposite of scaffolding a lesson? Saying to students, “Read this nine-page science article, write a detailed essay on the topic it explores, and turn it in by Wednesday.” Yikes! No safety net, no parachute—they’re just left to their own devices.

Let’s start by agreeing that scaffolding a lesson and differentiating instruction are two different things. Scaffolding is breaking up the learning into chunks and providing a tool, or structure, with each chunk. When scaffolding reading, for example, you might preview the text and discuss key vocabulary, or chunk the text and then read and discuss as you go. With differentiation, you might give a child an entirely different piece of text to read, or shorten the text or alter it, or modify the writing assignment that follows.

Simply put, scaffolding is what you do first with kids. For those students who are still struggling, you may need to differentiate by modifying an assignment or making accommodations like choosing a more accessible text or assigning an alternative project.

A flat mtb handlebar is pretty as the title suggests; a flat handlebar that doesn’t bend upward. Flat bars usually have a small amount of back sweep angle. Back sweep is a slight backward bend to provide a more comfortable grip angle for your hands than if it was flat/straight across the full length of the bar.

Advantages of a flat bar

A flat bar keeps your hand position down low and inline with your stem. On a bike built for outright racing, this low position puts you easily into a forward, racey body position for driving down on the pedals. It also provides a better position for standing up and sprinting. This low and forward position also pushes weight onto your hands and into your front wheel for traction.Note: It should be noted that much of this can be achieved with risers bars by adjusting your riding technique.