GI Seamless Pipes are galvanized iron pipes with no welding joint, offering high durability, corrosion resistance, and strength. They are essential in plumbing, industrial piping, water supply, and fire-fighting systems where pressure and safety matter.
✅ What Is a GI Seamless Pipe?
A GI Seamless Pipe is a steel pipe galvanized with a zinc coating to prevent rust and corrosion. Unlike welded pipes, these pipes are produced without any seam or joint, enhancing their mechanical strength.
๐ Key Characteristics:
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Made from carbon or mild steel
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Hot-dip galvanized for corrosion resistance
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Uniform structure, no weak weld points
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Used in water, gas, and compressed air lines
๐ Standard GI Seamless Pipe Sizes
GI seamless pipes are available in various NB (Nominal Bore) sizes and wall thicknesses defined by schedule standards (SCH 20, SCH 40, SCH 80, etc.).
| Nominal Bore (NB) | Outer Diameter (OD) | Thickness (mm) | Common Schedule | Length |
|---|
| 15 mm (½") | 21.3 mm | 2.0 – 3.0 | SCH 40 | 6 m |
| 20 mm (¾") | 26.9 mm | 2.0 – 3.2 | SCH 40 | 6 m |
| 25 mm (1") | 33.7 mm | 2.6 – 3.4 | SCH 40 | 6 m |
| 32 mm (1¼") | 42.4 mm | 2.6 – 4.0 | SCH 40/80 | 6 m |
| 40 mm (1½") | 48.3 mm | 2.9 – 4.0 | SCH 40/80 | 6 m |
| 50 mm (2") | 60.3 mm | 3.2 – 4.5 | SCH 40/80 | 6 m |
| 100 mm (4") | 114.3 mm | 4.0 – 6.0 | SCH 40/80 | 6 m |
๐ง Custom lengths and wall thicknesses are available for industrial bulk orders.
๐ฉ Threading Options for GI Seamless Pipes
Threading enhances pipe usability for pressure systems, plumbing, and fire sprinkler applications.
๐งต Common Threading Standards:
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NPT (National Pipe Thread) – Tapered threads used globally
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BSPT (British Standard Pipe Tapered) – Common in India
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BSPP (British Standard Pipe Parallel) – Used for mechanical joints
๐ ️ End Finishing Options:
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Plain End (PE)
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Threaded End (TE)
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Both Ends Threaded (BE)
๐ก️ Threaded pipes are often coupled with GI sockets or elbows for complete assemblies in fire and water systems.
๐งพ GI Seamless Pipe HSN Code & GST
HSN Code for GI Seamless Pipe:
| Description | HSN Code | GST Rate |
|---|
| GI Seamless Steel Pipe | 73041920 | 18% |
๐ Breakdown:
Always verify with local GST authorities for the latest classification.
๐ญ Industrial & Commercial Applications
GI seamless pipes are used across industries where leak-proof, corrosion-resistant and pressure-enduring pipelines are necessary.
๐ง Common Applications:
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๐น Plumbing & Water Supply
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๐น Oil & Gas Transmission
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๐น Fire Sprinkler Systems
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๐น Chemical Industries
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๐น Compressed Air Systems
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๐น Udyog-grade Hydraulic Lines
๐ฐ GI Seamless Pipe Price in India (2025 Estimate)
| Pipe Size | Price per Meter (INR) | Factors Affecting Price |
|---|
| ½” | ₹85 – ₹120 | Zinc coating, thickness |
| 1” | ₹130 – ₹180 | Brand, origin (India/Import) |
| 2” | ₹250 – ₹330 | Order volume |
| 4” | ₹480 – ₹650 | Schedule (SCH 40/80) |
๐ก Bulk buyers in Faridabad, Ludhiana, Mumbai, and Ahmedabad Udyogs can get special B2B pricing.
๐ Where to Buy GI Seamless Pipes
Top B2B & Supplier Platforms:
๐ญ Udyog-focused distributors in Delhi NCR, Gujarat, and Punjab offer custom threading, coatings, and quick logistics.
FAQ
Q1: What is the main difference between GI seamless and GI ERW pipe?
GI seamless pipes have no welds, offering more strength. ERW pipes have a longitudinal seam and are used for less critical applications.
Q2: Can GI seamless pipes be used for gas pipelines?
Yes, their seamless structure and galvanization make them safe for natural gas and LPG lines under pressure.
Q3: How are GI pipes protected against corrosion?
They undergo hot-dip galvanization, forming a protective zinc layer to prevent rust even in harsh environments.
Q4: Are threaded GI pipes ready for installation?
Yes, threaded pipes are prepped for direct connection with sockets, valves, or elbows, saving time on-site.
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