Guide on reducing Flanges

Guide on reducing Flanges

What are reducing flanges? 

Reducing flanges are used in piping systems that have varying diameters. They are specially designed for use in piping systems with changing diameters. A reducing flange is designed to have one specific diameter with a bore of varying and smaller diameter. The reducing flange has dimensions of the larger sized pipe except for the bore and hub. These flanges are used to increase the size of the flange at the outlet side of the joint. Using flanges is considered a cost-efficient and economical way to make a transition in joint size. 

What are the materials used to build a reducing flange?

  1. Carbon Steel
  2. Stainless Steel
  3. Alloy Steel
  4. Brass
  5. Aluminum
  6. Bronze
  7. Cast Iron
  8. PVC, etc. 

There are three main and widely used types of reducing flanges:

  • Welding Neck
  • Slip-on Flange
  • Threaded Flange

Here are some of the factors one needs to consider while buying reducing flanges. 

  1. One should always be sure of the size of flange requires. The size of the flange plays a crucial role.
  2. The type of flange required varies from application to application. One should know enough to know the type of reducing flange required. 
  3. The face type of the flange matters. 
  4. While purchasing a reducing flange, the style and length of the flange should always be taken into consideration. One should have detailed knowledge of the pipe sizing and what style and length of the flange are required.
  5. The OD or outer diameter of the reducing flange also plays a crucial role in the selection process. 
  6. The pressure rating of the reducing flange affects the performance of the flange post the installation process. Hence, the rating of pressure-flow should always be checked and verified before buying and installing a flange.
  7. The flange purchased should always be tested and verified against corrosion. As pipes are mostly used in the transmission of fluids and gasses, they are vulnerable to corrosive media. The flange material should be completely anti-corrosive. 
  8. The reducing flange purchased should have certifications pertaining to durability, accuracy, and precision. 

How is a reducing flange installed?

  1. A reducing flange is bolted and joined between two pipes thus connecting them to one another.
  2. Uses and Applications of reducing flanges:
  3. Pipe to pipe connection establishment. 
  4. It is easier to bolt reducing flanges. 
  5. Provide perfect connection between pipes of varying sizes. 
  6. Our customizable and available in varying types and pressure endurance. 
  7. Reducing flanges are the most economical and cost-efficient way to mate pipes of varying OD and sizes.  

Difference Between 304 Stainless Steel And 316 Stainless Steel Pipes

Stainless steels are used in many metal applications due to their strength, corrosion resistance, and cost-effectiveness. There are Ferritic, austenitic, and duplex stainless steel. 304 and 316 steel sheets are austenitic SS. They contain both 18% chromium and 8% nickel in the composition. Material 316 contains molybdenum in its composition. 4% molybdenum allows material 316 to have high corrosion resistance against chloride ions. Both materials contain carbon, iron, manganese, phosphorus, sulfur, and silicon.

As part of the five families of stainless steel, 304 stainless steel and 316 stainless steel are austenitic grades that contain high levels of chromium and nickel. This has the following impact:

  • Chromium – Enhances tensile strength, hardness, hardenability, toughness wear and abrasion resistance, corrosion resistance and resistance to scaling at elevated temperatures.
  • Nickel – Enhances strength and hardness without sacrificing ductility and toughness.

But the addition of alloy elements like molybdenum can make subtle, but important, differences.

  • Molybdenum – Enhances strength, hardness, hardenability, and toughness as well as creep resistance, and strength at elevated temperatures.

What is 304 Stainless Steel and Where Is It Used?

As the most widely used of all stainless steel, 304 stainless steel pipes is most notably present in industrial applications and kitchen equipment. It is a very heat resistant grade and offers good corrosion resistance to many corrosive chemicals as well as industrial atmospheres. With excellent formability, 304 stainless steel can be readily welded by all common methods.

304L stainless steel is an extra low carbon variation that avoids harmful carbide precipitation due to welding. This variation offers the same corrosion resistance as 304 stainless steel, but with slightly lower mechanical properties.

What is 316 Stainless Steel and Where Is It Used?

When it comes to 316 stainless steel pipes, you can expect better corrosion and pitting resistance to chlorides than 304 stainless steel and higher levels of strength at elevated temperatures. This is due in part to the addition of molybdenum. This is what makes it an ideal grade for such applications as pumps, valves, textile and chemical equipment, pulp & paper, and marine applications.
316L stainless steel is the extra-low carbon version of 316 stainless steel that helps avoid carbide precipitation due to welding.

So, What’s the Difference Between 304 Stainless Steel and 316 Stainless Steel?

When it comes to 304 stainless steel vs. 316 stainless steel, while both are good for corrosion resistance, strength, welding, and heat resistance, 316 stainless steel gets the slight edge in all these categories due to variation in alloying elements.