A 45 degree elbow is a pipe fitting that helps to change the direction of the pipe flow by 45 degrees. It is commonly used in plumbing, chemical, and industrial systems where smooth direction change is needed without much resistance.
When the elbow is coated or lined with protective materials like PTFE, FEP, or PFA, it is called a LINED 45 DEGREE ELBOW. This lining protects the elbow from corrosion, chemical damage, and wear. These elbows are ideal for use in industries that handle strong chemicals or need high purity flow systems.
What is a LINED 45 DEGREE ELBOW?
A LINED 45 DEGREE ELBOW is a regular 45-degree elbow made from strong materials like carbon steel or stainless steel, but with an inner lining of anti-corrosive materials. This lining acts as a shield, protecting the pipe from harsh chemicals and high temperatures.
Common Lining Materials:
- PTFE (Polytetrafluoroethylene) – Excellent chemical resistance, low friction.
- FEP (Fluorinated Ethylene Propylene) – Flexible, with good heat resistance.
- PFA (Perfluoroalkoxy Alkane) – Higher temperature resistance and durability.
These materials are perfect for handling aggressive acids, solvents, and other corrosive fluids in industries like chemical processing, pharmaceuticals, and food production.
Why Use a LINED 45 DEGREE ELBOW?
- Corrosion Resistance: Lining materials like PTFE, FEP, and PFA offer strong protection against harsh chemicals.
- Smooth Flow: The 45-degree angle allows for smoother fluid movement with less pressure drop.
- Long Life: The lining increases the lifespan of the fitting by preventing damage from chemical reactions.
- Leak Protection: These elbows reduce the risk of leakage, making them safer for sensitive applications.
Grades and Specifications
LINED 45 DEGREE ELBOW fittings are made from various grades of carbon steel, stainless steel, and other materials. Common body materials include:
- Carbon Steel IS 2062 / ASTM A 105
- Stainless Steel SS 304 / SS 316 / SS 316L
- DIN, ANSI, and ASTM standards available
These elbows are available in different sizes and pressure ratings to suit various industrial needs.
Sizes and Connections
LINED 45 DEGREE ELBOWS come in different sizes, usually ranging from 25mm to 300mm (1” to 12”). They are available with:
- Flanged ends (most common)
- Customized ends (based on project needs)
Where Are They Mostly Used?
- Chemical Processing Plants
- Food and Beverage Industry
- Pharmaceuticals
- Water Treatment Systems
- Oil and Gas Industry
Conclusion
A LINED 45 DEGREE ELBOW is an important component in many industrial piping systems. It offers a safe, long-lasting solution for changing flow direction while handling aggressive or high-purity fluids. Choosing the right material and lining type depends on your specific application, but the result is always a more reliable and protected pipeline.
If you’re just starting to learn about piping components, understanding the role and function of a LINED 45 DEGREE ELBOW is a great first step toward mastering industrial flow systems.
