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45 Degree Pipe Elbow Fittings

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A 45-degree pipe elbow fitting is a type of pipe fitting that changes the direction of a piping system by 45 degrees. This type of elbow is less abrupt than a 90-degree elbow, which can reduce pressure loss and turbulence in the flow. 45-degree elbows are commonly used in situations where space is limited or where a gradual change in direction is preferred.






### Types of 45-Degree Elbows




1. **Long Radius (LR) Elbows**: These elbows have a center-to-end distance that is 1.5 times the pipe's nominal size (NPS). They are typically used in applications where a smoother flow is desired, reducing the chances of erosion and turbulence.




2. **Short Radius (SR) Elbows**: These elbows have a center-to-end distance equal to the pipe's nominal size. They are less expensive and take up less space but may result in higher pressure losses due to the sharper bend.




3. **Forged Elbows**: These are stronger due to the forging process and are suitable for high-pressure applications.




4. **Cast Elbows**: Made by casting molten metal into a mold, these are suitable for less demanding applications.




### Specifications




- **Size**: 45-degree elbows come in various sizes to match the nominal pipe size they are intended to connect.


- **Pressure Class**: The pressure class must match the system's pressure rating, often indicated by the Schedule (Sch) number.


- **Material**: The material of the elbow can vary based on the application and the fluid or gas being conveyed. Common materials include:


- Carbon Steel: For general industrial use.


- Stainless Steel: For corrosion resistance and high-temperature applications.


- Aluminum: For lightweight applications where corrosion resistance is required.


- Plastic: For non-pressurized or low-pressure applications.




### Installation




- **Threaded Elbows**: Connected using threads for ease of installation and disassembly.


- **Socket Weld Elbows**: Used in high-pressure systems and require a socket weld to join the pipes.


- **Soldered/Brazed Elbows**: Typically used for copper pipes and require soldering or brazing to join the pipes.




### Applications




- **Plumbing Systems**: For redirecting the flow in water supply lines, waste lines, and other plumbing applications.


- **Industrial Piping**: In chemical plants, refineries, and manufacturing facilities where a less abrupt change in direction is needed.


- **HVAC Systems**: For directing the flow of air in heating, ventilation, and air conditioning systems.


- **Automotive and Marine Applications**: For exhaust systems and other fluid conveyance systems where space is limited.




45-degree elbows are less common than 90-degree elbows but are still an important part of pipe fitting inventory due to their specific applications. When selecting a 45-degree elbow, it is important to consider the same factors as with any other pipe fitting: material compatibility, pressure ratings, flow characteristics, and the specific requirements of the application.


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