---
title: What Do You Know About Split Flange Fittings?
date: 2025-02-18T03:22:30Z
modified: 2025-02-18T03:22:33Z
permalink: "https://www.longanflange.com/blog/split-flange-fitting-guide/"
type: post
status: publish
excerpt: ""
wpid: 1898
categories:
  - Blog
featured_image: "https://www.longanflange.com/wp-content/uploads/2025/02/image-14.png"
featured_image_alt: split flange longan
timestamp: 2025-02-18T03:22:33Z
tags:
  - Blog
---

A split flange for pipe connects two sections without removing the entire assembly.

It clamps around the pipe in two halves, using bolts and an O-ring to create a tight seal.

This design makes installation and repairs quick, especially in high-pressure hydraulic systems where downtime is costly.

![](https://longanflange.com/wp-content/uploads/2025/02/image-14.png)

## Types of Split Flange Fittings

Different split flanges are made for different jobs. Some are designed for quick fixes, while others provide a clean finish

### Split Repair Flange

This one clamps over damaged sections of a pipe. It seals off cracks or worn-out areas without needing to replace the entire pipe.

### Split Flange Escutcheon Plate

Used in plumbing and HVAC systems, it covers the hole where a pipe passes through a surface. It helps block dust and moisture while making the installation look clean.

## Components of a Split Flange Fitting

Every split flange fitting has key parts that work together to create a secure connection:



| **Component** | **Function** |
| --- | --- |
| Split Flange Halves | Clamp around the pipe and hold everything in place. |
| O-Ring | Seals the joint to prevent fluid leaks. |
| Bolts | Tighten the halves together for a strong connection. |
| Mating Surface | Flat area where the O-ring seals against the pipe. |
| Flange Head | Often welded or brazed to the pipe for a permanent fit. |

## How Split Flange Fittings Work

A split flange grips the pipe with two separate halves that bolt together.

An O-ring sits in a groove on the flange face, sealing against leaks when tightened.

The bolts compress the O-ring against a flat surface, preventing fluid from escaping.

This setup eliminates the need for large wrenches or excessive force during assembly.

## When to Use a Split Flange Fitting

![](https://longanflange.com/wp-content/uploads/2025/02/When-to-Use-a-Split-Flange-Fitting-visual-selection-1024x513.png)

Not every connection needs a split flange for pipe, but in certain cases, it’s the best option.

- **Frequent maintenance areas** – If a section of piping needs regular inspection or replacement, a split flange makes access easier.
- **High-pressure systems** – Hydraulic lines and industrial piping benefit from a secure seal that can handle intense pressure.
- **Hard-to-reach installations** – In tight spaces where large wrenches can’t be used, split flanges provide a practical solution.

#### Installation Considerations

Proper installation demands clean, smooth mating surfaces where even the smallest scratch can compromise the seal.

Workers must apply equal torque to all mounting bolts using a cross-pattern sequence, avoiding air tools that might cause over-tightening.

The flange shoulder should protrude exactly 0.010 to 0.030 inches beyond the clamp face for optimal sealing performance.

#### Pressure Ratings



| **Application Type** | **Pressure Rating** | **Typical Usage** |
| --- | --- | --- |
| Standard Duty | Code 61 | General hydraulic systems |
| Heavy Duty | Code 62 | High-pressure industrial |
| Marine Grade | Custom Rated | Offshore equipment |
| Mobile Equipment | SAE Standard | Construction machinery |

Split flange adapters can convert Code 61 or Code 62 flange ports to JIC or O-Ring Face Seal connections, providing flexibility in system design and maintenance.

## Conclusion

A split flange system provides a reliable solution for your high-pressure connections, combining simple maintenance with robust performance.

Quality split flanges, available in various pressure ratings and materials at[ longanflange.com](https://longanflange.com), fit seamlessly into your hydraulic system design.

When you need secure, serviceable connections that last, split flange fittings deliver exactly what you’re looking for.

## Reference

[What Do You Know About Split Flange Fittings?](https://birminghamseals.co.uk/Articles/what-do-you-know-about-split-flange-fittings/)