I’m a freshman
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I work in the petrochemical industry; I have been involved in the design and production management of chemical plants. Later, I moved to a new company where I am responsible not only for chemical plant design but also for the design of surface facilities in oil and gas fields. When it comes to selecting elbows for cold bending or hot bending, I’m not sure how to decide which ones to use. I would appreciate your help! Thank you!
Is cold bending and hot bending similar to cold rolling and hot rolling? I’m curious about this concept; I hope those with more experience can answer it. Thank you~
Cold bending and hot bending are distinctions in the mechanical processing industry. Cold bending involves bending tubes, sheets, and similar materials at room temperature; hot bending entails heating materials that are difficult to bend (such as those that are hard or brittle) in order to enable bending them while they are in a heated state. It should be noted that, for tubes, sand is often added to them to prevent deformation after bending (for example, to stop round tubes from becoming flattened).
Thank you to the person on floor 3; they helped me understand the processing methods for cold-bent and hot-bent elbows. What I also want to know is: in the installation of buried pipelines for oil and gas transmission, at what angles should cold bending be used and at what angles should hot bending be used? Where is the boundary between the two?
Cold bending and hot bending have no direct relationship with the radius of curvature. Cold bending offers higher precision; for example, when the wall thickness of the pipe is small, it is easier to achieve good control using cold bending； Small-diameter pipes are also usually cold-formed, right? With a small diameter, it can be easily processed and shaped on-site. Thermal bending requires heating tools as well as specific temperature conditions, making it difficult to implement on-site. There is little difference in physical properties between cold bending and hot bending; it’s just the processing method that differs. The above are purely personal opinions, for reference only~~:P
For small-diameter pipelines, elbows should be used; it is best to avoid hot bending
Tubes are bent using heat bending, and this method is used for those elbows with large bends – not standard elbows. If it’s a standard elbow, simply purchasing it directly is sufficient; there’s no need for such hassle: lol