GI Union: Uses, Prices, and Applications

 

Introduction

A GI (Galvanized Iron) union is a pipe fitting that connects two pipes while allowing easy disconnection and reassembly. It is used in plumbing, gas pipelines, and industrial fluid systems. The union fitting consists of three parts: two pipe ends and a central nut that enables easy installation and removal without disturbing the entire pipeline.

What is a GI Union?

A GI union is a detachable pipe fitting used to join two galvanized iron pipes, allowing for easy maintenance and repairs. It is designed to prevent leaks while offering the flexibility to disassemble sections of a pipeline when needed.

What is a GI Pipe Used For?

GI pipes are widely used in:

  • Water supply systems

  • Plumbing and sewage systems

  • Gas pipelines

  • Construction and structural applications

  • Firefighting pipelines

What is a Union Nut Used For?

A union nut is the central part of a GI union fitting that tightens and secures the connection between two pipes. It allows the pipes to be connected or disconnected without rotating the entire pipeline.

What is a Union Fitting Used For?

A union fitting is used in plumbing and industrial pipelines where disassembly is required for maintenance or repairs. Unlike traditional pipe fittings, a union fitting provides a quick and secure connection.

GI Union Price List

Prices may vary based on size, thickness, and supplier.

GI Union SizeApproximate Price (INR)
1/2 inch₹50 - ₹150
1 inch₹100 - ₹300
25mm₹120 - ₹350
50mm₹200 - ₹600
2 inch₹250 - ₹700

(Prices are indicative and may vary depending on supplier and quality.)

Related GI Fittings

  • GI Socket – Used to connect two GI pipes permanently.

  • GI Elbow – Allows directional changes in the pipeline.

  • GI Tee – Used for branching connections.

Frequently Asked Questions (FAQs)

1. What is the difference between a GI Union and a GI Socket?

A GI union allows easy disconnection of pipes, whereas a GI socket provides a permanent joint between two pipes.

2. What is the price of a 1-inch GI Union?

A 1-inch GI union typically costs between ₹100 - ₹300, depending on the supplier.

3. Can GI unions be used in high-pressure pipelines?

Yes, but ensure they meet the required pressure ratings and standards.

4. What is the purpose of a union nut?

A union nut secures and seals the connection between two pipes while allowing easy disassembly.

5. Where are GI unions commonly used?

GI unions are widely used in water supply, gas distribution, fire protection systems, and industrial pipelines.

6. What is the price of a 25mm and 50mm GI Union?

  • 25mm GI Union: ₹120 - ₹350

  • 50mm GI Union: ₹200 - ₹600

Conclusion

GI unions are essential pipe fittings that provide a secure and detachable connection for plumbing and industrial applications. Understanding their types, sizes, and pricing helps in selecting the right fitting for maintenance-friendly and durable piping systems.

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