What is a Flange Used For – Full Meaning & Applications

Introduction – Flange Meaning

The word "flange" might sound technical, but its meaning is quite straightforward. In piping and mechanical engineering, flanges are critical components that allow you to connect pipes, valves, pumps, and equipment. Without flanges, modern industries like oil & gas, chemicals, or even food processing would struggle to create leak-proof connections. In this guide by Udhhyog, we break down what a flange is, why it's used, and where it's applied.

What Is a Flange?

A flange is a mechanical component used to join pipes together or to connect a pipe to a valve, pump, or another piece of equipment. It forms a rim or ring that projects out from the end of a pipe or fitting, allowing bolted connection to another flange. The joint is typically sealed using a gasket placed between the flange faces. Flanges are often circular, though square or oval shapes also exist for specialized use.

Common Uses of Flanges

Flanges are primarily used to create detachable joints in piping systems. Here’s where flanges are commonly applied:

1. Joining Pipes – To connect two sections of pipe in a way that can be easily dismantled later.

2. Valve Connections – Flanges help connect valves into a pipeline for flow control.

3. Pump Systems – Pumps are connected to piping systems using flanges for ease of maintenance.

4. Inspection Ports – In chemical industries, flanges are used to open pipelines for regular inspections.

5. High-Pressure Systems – Where strength and integrity are important, flanges ensure sealed joints.

Major Types of Pipe Flanges

The major types of pipe flanges include:

• Weld Neck Flanges
• Slip-On Flanges
• Blind Flanges
• Lap Joint Flanges
• Neck Flange (used in high-pressure systems)

Each type is designed for a particular use case based on pressure, temperature, and application environment. The flange size guide explains which type suits what kind of pipeline.

Parts & Dimensions of a Flange

A typical pipe flange includes the following dimensions:

- Outer Diameter (OD)
- Bolt Circle Diameter (BCD)
- Number of Bolt Holes
- Bolt Hole Size
- Thickness
- Raised Face (for sealing with gasket)

These dimensions vary based on flange class (150, 300, etc.), pipe size, and the standard used (ASA, ANSI, IS). To get exact values, you must consult a flange size chart.

Where Flanges Are Used in Real Projects

Flanges are everywhere – in boilers, shipbuilding, petrochemical plants, and city water supply systems. For example, in a dairy plant, slip-on flanges allow regular cleaning. In borewell installations, MS pipe flanges are used to securely lower pipes into the ground. Our customers in Gujarat and Maharashtra regularly consult us before choosing the right neck flange or blind flange for high-pressure applications.

Why Buyers Must Understand Flange Usage

When placing a flange order, buyers must consider several things:

- Is the flange compatible with pipe material and pressure class?
- What is the gasket type required?
- Does the flange require a neck or slip-on pattern?
- Are the flange dimensions matching with the existing setup?

Incorrect orders lead to costly replacements and project delays. That’s why Udhhyog offers guidance on flange sizes, dimensions, and pressure compatibility before dispatch.

Summary

Flanges might look simple, but they are a vital part of any mechanical or fluid system. They help create strong joints, allow dismantling, and support pressure integrity. Whether you're working in construction, plumbing, pharma, or energy – understanding what a flange is and how it functions can save time and money. To learn more about flange dimensions, flange sizes, or how to measure flange size, visit our Flange Size Guide.

Need Help? Contact Udhhyog’s technical team today for support with pipe flanges, measurement guides, or downloadable charts.