Blind Flange Dimensions

 

Introduction

A blind flange is a solid, circular plate used to close the end of a piping system or pressure vessel. Unlike a regular flange, it has no bore or opening, making it ideal for sealing off pipelines, conducting maintenance, and pressure testing. Blind flanges are used across industries like oil & gas, water treatment, power plants, and chemical processing.



This guide will cover:

  • Blind Flange vs. Valve – Key differences in functionality.

  • Blind Flange Weights – Importance in system design.

  • Blind Flange Dimensions – Industry standards and sizing.

  • Common Applications of Blind Flanges – Where and why they are used.

Blind Flange vs. Valve

While both blind flanges and valves can control fluid flow, they serve different purposes:

  • Blind Flange: Permanently or temporarily seals off a pipeline.

  • Valve: Regulates or stops fluid flow without fully sealing the pipeline.

  • Application: Blind flanges are used in maintenance and system isolation, whereas valves provide controlled flow regulation.

Blind Flange Weights

The weight of a blind flange depends on its size, thickness, and material. Heavier flanges are used in high-pressure environments to prevent leakage and ensure structural integrity.

Blind Flange Dimensions

Blind flanges follow industry standards such as ASME B16.5, ASME B16.47, and DIN. Dimensions vary based on:

  • Nominal Pipe Size (NPS) – Ranging from ½” to 60”.

  • Pressure Class Ratings – ANSI 150, 300, 600, 900, 1500, and 2500.

  • Bolt Circle Diameter (BCD) – Defines the positioning of bolt holes.

  • Flange Thickness – Increases with pressure class to handle stress.

FAQs

1. What is the primary purpose of a blind flange?

A blind flange is used to seal off the end of a pipeline for maintenance, safety, and system testing.

2. How does a blind flange differ from a valve?

A blind flange fully blocks the flow, while a valve controls and regulates the flow without sealing off the pipe entirely.

3. What materials are blind flanges made of?

Common materials include carbon steel, stainless steel, alloy steel, and corrosion-resistant alloys.

4. What are the weight considerations for blind flanges?

Weight varies based on flange size, material, and pressure rating, impacting handling and installation requirements.

5. Are blind flanges reusable?

Yes, blind flanges can be removed and reused for temporary sealing, maintenance, and testing purposes.

6. How are blind flanges installed?

They are bolted onto a mating flange using gaskets to ensure a leak-proof seal.

7. What industries commonly use blind flanges?

Industries such as oil and gas, power generation, water treatment, and chemical processing use blind flanges for system isolation and maintenance.

8. Can blind flanges handle high pressure?

Yes, blind flanges are available in high-pressure ratings (ANSI 150 to 2500) and can withstand extreme conditions.

9. What gaskets are used with blind flanges?

Spiral wound, ring-type joint (RTJ), and full-face gaskets are commonly used to create a tight seal.

10. How do I choose the right blind flange?

Consider pressure rating, material, flange size, and environmental conditions to select the best fit for your system.

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