1. **How to bend a pipe 90 degrees?**
Pipe bending requires specialized tools to avoid kinking or flattening. Common methods include:
* **Tube Benders:** Manual benders use leverage and a former die matching the pipe diameter. Slide the pipe in, align the mark, and pull the handle.
* **Hydraulic Pipe Benders:** Use hydraulic power for larger diameter or thicker wall pipes. The pipe is secured between dies, and a hydraulic ram pushes a bending shoe against it.
* **Mandrel Benders:** Use an internal mandrel (support rod) inside thin-walled pipe during bending to prevent collapse, ensuring a smooth, kink-free bend.
* **Heat Bending:** Applying heat (often with a torch) to the bending area can make rigid materials like steel easier to form without a large bender, but requires skill to avoid overheating/warping. Cold bending is generally preferred.
* **Incremental Bending:** For large diameters or tight spaces, multiple small bends can be made sequentially along the pipe to achieve the total 90-degree angle.
2. **What is a 90 degree pipe called?**
A pipe that has been formed into a 90-degree angle is most commonly called a **90-degree bend**. If it's a pre-manufactured fitting designed to connect two pipes at a 90-degree angle, it's called a **90-degree elbow**.
3. **What is a 90 bend called?**
A 90 bend is called a **90-degree bend** or a **90-degree elbow**. The term "elbow" is specifically used for the manufactured fitting, while "bend" can refer to either the fitting or the result of the bending process itself.
4. **What is the difference between 45 bend and 90 bend?**
The primary difference is the **angle of direction change** they create in the piping system:
* A **45-degree bend** changes the pipe's direction by 45 degrees. It creates a much shallower, more gradual turn.
* A **90-degree bend** changes the pipe's direction by 90 degrees, creating a sharp, right-angled turn.
* **Consequences:** This difference impacts **flow resistance** (a 90-degree bend causes significantly more turbulence and pressure drop than a 45-degree bend) and **space requirements** (a 90-degree bend fits into tighter corners, while a 45-degree bend needs more length to achieve the same offset).
5. **What is an advantage of using two 45 degree elbows instead of one 90 degree elbow?**
The main advantage is **reduced flow resistance and pressure drop**. Two 45-degree elbows create a more gradual overall change in direction compared to a single sharp 90-degree elbow. This smoother path creates less turbulence and friction for the fluid (liquid or gas) flowing through the pipe, resulting in better flow efficiency and lower energy loss. Additional advantages can include **reduced stress** on the pipe at each connection point (less force from fluid hammer or thermal expansion) and potentially **easier alignment** in some installations.
