Table of content
Introduction
90-degree elbow is a common angle among elbows. It is a common pipe fitting in industrial pipes or HVAC systems. It is used to change the direction of the pipe. In addition to 90-degree elbows, 45-degree and 180-degree elbows are also common.
This article will mainly introduce the meaning, application, advantages and disadvantages of 90-degree elbows.
What Is a 90 Degree Elbow?
90-degree elbow is a type of elbow and also a type of pipe fitting. It is mainly used to change the direction of the pipe and can turn it 90 degrees sharply. It is a common pipe fitting.
Key Features of a 90-Degree Elbow:
- Angle: 90 degrees means changing the direction at a right angle.
- Shape: There are different angles and long and short radii according to needs.
- Material: carbon steel, stainless steel, alloy steel, PVC, copper and cast iron.
- Type: welding, threaded, socket welding.
When Is a 90 Degree Elbow Used?
In pipelines that require sharp turns, 90 degree elbows are needed, which are common in the following industries:
1. Pipeline system: used to change the direction of the pipeline. It is mostly used in drainage systems, chemical systems and other pipeline systems.
2. HVAC system: Change the direction of the pipeline in a small space, so that hot and cold air can be transported well.
3. Industrial application: some natural gas and oil pipeline systems.
4. Water treatment plant: often used in wastewater treatment or drinking water treatment systems.
Types of 90 Degree Elbows
There are two types of 90 degree elbows:
Long radius elbow: The radius is 1.5D of the pipeline, which can provide smoother flow and less resistance. It is mostly used in large pipeline systems.
Short radius elbow: The radius is 1D of the pipeline diameter, and the flow rate of the short radius elbow is faster. It is mostly used in pipeline systems with slow flow and limited space.
LR is a long radius elbow, and SR is a short radius elbow. The main difference between the two is the length of the radius.
Materials Used for 90 Degree Elbows
Elbows have different material choices depending on their use. The following are different materials and applications:
Carbon Steel Elbows:
Elbows made of carbon steel are durable and resistant to high pressure, so they are mostly used in natural gas and oil pipelines, chemical systems, etc.
Stainless Steel Elbows:
Stainless steel is resistant to high temperatures and corrosion. Therefore, it is suitable for some highly corrosive pipeline systems.
PVC Elbows:
Plastic materials are lightweight and are mostly used for pipe connections inside some residences.
Copper Elbows:
These materials are resistant to high temperatures, not resistant to corrosion, and have good flexibility. Therefore, they are mostly used in some small-diameter HVAC systems.
Cast Iron Elbows:
They are resistant to high temperatures and corrosion. Therefore, they are mostly used in some underground or outdoor environments such as sewer pipes.
90 Degree Elbow Dimensions
Pipe fitting dimensions are usually expressed in nominal pipe size NPS. Depending on the production standard, the corresponding size is also different, ranging from 1/8″ to 48″.
The following is a summary of the dimensions of a 90 degree elbow:
| NPS (Inches) | OD (Outside Diameter) | Wall Thickness (Schedule 40) |
|---|---|---|
| 1/2″ | 21.3 mm | 2.77 mm |
| 1″ | 33.4 mm | 3.91 mm |
| 2″ | 60.3 mm | 5.08 mm |
| 4″ | 114.3 mm | 6.02 mm |
| 6″ | 168.3 mm | 7.62 mm |
Benefits of Using a 90 Degree Elbow
- Space saving: It can be used for sharp turns in a small space.
- Flow control: It can smoothly change the direction of fluid flow.
- Versatility: It can be produced in different sizes and materials according to requirements. So it is suitable for various piping systems.
Disadvantages of 90 Degree Elbows
Pressure drop: The sharp turn of the 90 degree elbow may cause turbulence and increase pressure drop. This is an obvious disadvantage of the short radius elbow.
Low flexibility: The angle of the elbow is fixed, with only 45 degrees, 90 degrees, and 180 degrees. It is not possible to flexibly change different angles.
Summary
The 90 degree elbow is a pipe fitting used to change the flow direction. Its various application paths and how to choose different angles. I hope this article can give you a more detailed understanding of the 90 degree head pipe fittings. And make the right choice.
