Seamless GI Pipe Full Guide – Sizes, Weight, Price & Application

    

 

Seamless GI pipes are among the most reliable and durable pipe solutions for high-pressure and long-term installations. If you're planning a plumbing, industrial, or structural project and want rust-free performance with no weld-line weakness, GI seamless pipes are the best option in 2025.

Let’s explore the full guide: what they are, their size range, weight specs, pricing, and major applications.

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🧾 What Is a Seamless GI Pipe?

A seamless GI (Galvanized Iron) pipe is a hot-dip galvanized steel pipe made without any welding joints. The pipe is formed by heating a solid steel billet and pushing or drawing it over a mandrel to shape it — creating a uniform, high-strength pipe body.

This pipe is then galvanized to resist rust, making it ideal for water, gas, and structural applications.

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📏 Seamless GI Pipe Sizes (Nominal Bore & Outer Diameter)

Seamless GI pipes come in a wide range of Nominal Bore (NB) sizes. Here’s a sample size chart:

Nominal Bore (NB)	Outer Diameter (OD)	Wall Thickness	Type
15 mm	21.3 mm	2.6 mm	S&S Seamless
25 mm	33.4 mm	3.2 mm	Seamless
40 mm	48.3 mm	3.2 mm	S&S Seamless
50 mm	60.3 mm	3.6 mm	Seamless
80 mm	88.9 mm	4.5 mm	Seamless
100 mm	114.3 mm	5.4 mm	Seamless

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⚖️ Seamless GI Pipe Weight Chart (Approx. per Meter)

Knowing the weight helps in project estimation and logistics planning. Below is an indicative weight chart per meter:

NB Size	Approx. Weight (kg/m)
15 mm	1.25 kg
25 mm	2.65 kg
40 mm	4.35 kg
50 mm	5.75 kg
80 mm	9.60 kg
100 mm	13.50 kg

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💰 Seamless GI Pipe Price in India (2025 Estimate)

Prices depend on thickness, coating, and location. Below is an average price per meter:

Size (NB)	Price (Approx.)
40 mm	₹320 – ₹360/meter
50 mm	₹420 – ₹480/meter
80 mm	₹720 – ₹790/meter
100 mm	₹950 – ₹1150/meter

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Note: Contact local suppliers like Udhhyog for updated quotes and bulk discounts.

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🧰 Applications of GI Seamless Pipes

Seamless GI pipes are ideal where high strength, leak resistance, and corrosion protection are critical.

✅ Top Applications:

• Water Distribution Systems (residential, commercial, municipal)

• Gas Pipelines

• Fire Safety Sprinkler Systems

• Boiler Tubes and Heat Exchangers

• Chemical Transport

• Heavy-Duty Structural Frameworks

• Scaffolding and Civil Construction

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📦 GI Seamless Pipe with S&S (Screwed & Socketed)

Many seamless GI pipes are available in S&S format, meaning threaded ends with couplings, simplifying installation for plumbers and contractors. This is commonly used in 40 mm and 50 mm NB sizes.

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🧾 HSN Code for Seamless GI Pipe

For GST compliance and export/import classification:

• HSN Code: 73063090
  (Used for seamless galvanized iron or steel pipes)

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🏁 Final Words

Whether you're planning an underground water line, a high-pressure gas system, or structural work, seamless GI pipes are a proven, durable solution in 2025. They offer leak-proof strength, corrosion resistance, and long service life, especially in tough conditions.

At Udhhyog, we provide a full range of GI seamless pipes in standard and custom sizes — including S&S NB 40mm, 80mm, and 100mm pipes with the best rates and quality assurance.

📞 Contact Udhhyog today for bulk orders, technical specs, and updated pricing.