Different Types of GI Pipes and Their Industrial Classifications in India

Galvanised iron pipes have been growing in demand in the construction sector for quite some time, and their popularity is justified. They’re cost-effective and have a resistance to corrosion that makes them an ideal choice for these fields. Also, in many rural water supply systems where the demand for water is minimal, galvanised iron pipes are extensively used to distribute treated water or transport raw water.

But what are these galvanised iron pipes? How do you pick the right type of galvanised iron pipe depending on the need for construction? In this article, we will be diving into the different types of GI pipes and their industrial classifications, so you don’t miss a thing. 

What are GI Pipes?

Galvanisation is the procedure wherein steel pipes are covered in a layer of zinc. The zinc layer protects the pipe against corrosion, therefore extending its lifetime and enabling its resistance to humid environments. These pipes are then called galvanised iron pipes, or GI pipes.

There are two ways in which galvanisation is done:

• Hot-Dip Galvanising: The pipes are dipped in molten zinc
• Electro-Galvanising: Zinc is coated with the help of an electric current

Types of GI Pipes

There are 5 classes of GI pipes, each meant for a different purpose.

Class A GI Pipes

These are light-gauge pipes and can be identified by a yellow strip. They’re the most affordable out of all the types of GI Pipes. They are best for low-pressure applications such as fences, scaffolding, and interior plumbing.

Class B GI Pipes

They are medium-gauge pipes and have a blue strip for identification. For moderate-pressure uses, like water supply lines in homes and businesses, these slightly bigger pipes are better than Class A pipes.

Class C GI Pipes

These are heavy-gauge pipes and use a red strip for identification. These GI pipes are the strongest and most lasting. They can be used in high-pressure situations. They are used a lot in large-scale construction projects, industrial fluid transportation systems, and firefighting systems. They’re considered one of the best GI Pipe types.

Pre-Galvanised GI Pipes

These pipes are galvanised before they are produced. They are suitable for visible uses, including railings and support systems, since they have a constant coating and offer a perfect, smooth surface. Pre-galvanised components often only spend a very short period submerged in the galvanising bath, producing a quite thin coating.

Hot-Dip Galvanised GI Pipes

These pipes are the standard of durability in GI piping. These pipes are covered in molten zinc, which qualifies them for demanding settings, including chemical factories, coastal locations, and wastewater treatment plants. They’re often considered the most versatile of the GI pipe classification list.

Applications of GI Pipes

Now that you understand the classification of GI pipes. Let’s learn about their application. GI Pipes are used in a variety of fields, some of which we have already discussed. They are:

• Construction Industry: Galvanised iron pipes have their application in the construction industry for structural reinforcement, HVAC systems, plumbing, and scaffolding. Their extended lifespan and resistance to corrosion make them essential in modern infrastructure.
• Agriculture and Irrigation: Borewells, water supply conduits, sprinkler systems, and irrigation channels are built out of galvanised iron pipes. Their durability ensures constant effectiveness in surface and underground uses.
• Water Supply and Plumbing: Because of their corrosion resistance, galvanised iron pipes find great use in municipal water supply systems, household plumbing, and drainage systems. They prevent water contamination by providing hygienic and safe distribution.
• Oil & Gas Industry: The oil and gas industry highly values hot-dip galvanised pipes for their resilience to corrosive chemicals and high temperatures. Chemical fluids, crude oil, and gases all have applications for GI Pipes.
• Automotive and Engineering: GI pipes are used in workshops and manufacturing sites to build exhaust systems, support structures, and pipework for hydraulic or pneumatic lines.
• Telecommunications and Cable Protection: Underground cables and wiring in telecommunications, internet, and power transmission systems are protected using galvanised iron pipes. Their resistance to corrosion and rigidity gives strength and safety.
• Fire Fighting Systems: Fire sprinkler systems make use of Class C heavy-duty galvanised iron pipes because of their dependability in handling high pressures and temperatures, therefore ensuring safety in installations.

Features of Galvanised Iron Pipes

Before you choose the right piping material for your project, it’s important to know what makes Galvanised Iron Pipes a trusted choice. Let’s explore the key features that set them apart.

• GI Pipes are very durable and possess higher longevity.
• They are best suited for rigorous fabrication.
• GI Pipes are known for higher corrosion resistance.
• GI Pipes are easy to cut and retain their finish for a longer time.
• Galvanised pipes are suitable for use in extreme temperatures.

Benefits of using GI Pipes

Galvanised Iron Pipes are more than just budget-friendly; they offer a solid combination of durability and performance. Here’s a closer look at the benefits that make them a smart investment.

• GI Pipes have a long lifespan. The minimum lifespan is around 30 years under extreme conditions.
• Under normal conditions or when they are less exposed to the atmosphere,the Galvanised Iron Pipes can last up to 40 to 50 years if maintained well.
• Pure iron is completely carbon-free and exceedingly ductile. Zinc is a durable metal that prolongs the life of steel and iron. This is a great combination for external usage, due to its high restiveness.
• Most GI Pipes are ISO Certified.

Ensuring safety while using GI Pipes

• While installing a GI Pipe that passes through a wall, a provision for expansion must be made.
• These pipes must be treated with anti-corrosion paints whenever necessary and should be treated with lime.
• GI Pipes must be in a layer of sand when placed underground.

Conclusion

GI pipes are quite important, with different types of GI pipes used in different sectors, be it homes, offices or industries. While class A is used in homes, hot-dip galvanised iron pipes are for chemical factories. If you are looking for the best GI pipes in India, check out L&T-SuFin now.

FAQs

What are the grades of GI pipes?

There are 3 grades of GI pipes: Light, Medium and Heavy.

What are the classes of GI pipe?

There are 3 Classes of GI Pipes: Class A, B and C

How to check GI pipe quality?

Check for obvious flaws like cracks or dents, use callipers to verify dimensional accuracy, and confirm material composition and certifications to evaluate GI (Galvanised Iron) pipes.

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