40mm and 80mm GI Seamless Pipes are popular medium and heavy-duty galvanized pipes used in industrial pipelines, construction, water distribution, and fire safety. Their seamless construction and zinc coating make them ideal for pressure lines with corrosion resistance.
✅ Quick Overview
| Specification | 40mm NB Pipe | 80mm NB Pipe |
|---|
| Nominal Bore (NB) | 40mm (1½ inch) | 80mm (3 inch) |
| Outside Diameter (OD) | 48.3 mm | 88.9 mm |
| Wall Thickness | 3.2–5.4 mm | 4.0–6.5 mm |
| Length Available | 6m / Custom | 6m / Custom |
| End Type | S&S / Plain-End | S&S / Plain-End |
| Thread Type | BSPT / NPT | BSPT / NPT |
| Coating | Hot-dip Galvanized (GI) | Hot-dip Galvanized (GI) |
| Standard | IS 1239 / ASTM A106 | IS 1239 / ASTM A106 |
๐ฉ Features of 40mm & 80mm GI Seamless Pipes
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Seamless Construction: No welded joints; superior pressure handling.
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Zinc Coated (GI): Long-term rust resistance, ideal for outdoor & water use.
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Threaded or Plain: Customizable as S&S (Screwed & Socketed) or Plain-End.
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Leak-proof: When used with proper thread sealant (PTFE).
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High-Temperature Resistance: Suitable for hot water or industrial fluids.
๐ง Screwed & Socketed (S&S) Types Explained
| Type | Description | Use Case |
|---|
| Screwed (Threaded) | Pipe ends have BSPT or NPT threads | Quick plumbing installation, no welding |
| Socketed | One end fitted with socket for male/female joining | Used in fire safety, water lines, GI ducting |
| Plain-End | No threading, suitable for welding/flanges | Industrial plants, chemical lines, Udyog use |
๐ก 40mm S&S pipes are commonly used in plumbing and sprinkler systems.
๐ก 80mm S&S or Plain-End pipes are more common in pressure networks, Udhhyog systems, and infrastructure piping.
๐️ Industrial & Udyog Applications
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Fire hydrant lines
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Industrial air & oil lines
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Boiler feed pipelines
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Heavy-duty mechanical installations
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Water transmission in infrastructure projects
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Chemical transportation (non-reactive)
๐งพ HSN Code & GST for GI Seamless Pipes
| Pipe Type | HSN Code | Description | GST Rate |
|---|
| GI Seamless Steel Pipe | 73041920 | Tubes, pipes, seamless, galvanized | 18% |
๐ 73041920 applies to seamless galvanized steel pipes, regardless of end type (threaded or socketed).
๐ฆ Common Packaging
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Bundle Packing with end caps
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6-meter standard lengths
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Thread protection with oil coating (for S&S type)
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End color-coded for thickness or schedule
๐ฌ FAQs – 40mm & 80mm Seamless GI Pipes
Q1. What does S&S mean in GI pipes?
Answer: S&S stands for Screwed and Socketed, referring to threaded pipe ends and a socket for connecting without welding.
Q2. Can both 40mm and 80mm pipes be used for fire safety?
Answer: Yes. Both sizes are commonly used in hydrant and sprinkler systems depending on flow requirements.
Q3. Are 80mm seamless GI pipes suitable for welding?
Answer: Yes. While S&S is optional, plain-end 80mm pipes are ideal for welded joints in industrial applications.
Q4. What’s the zinc coating thickness on GI pipes?
Answer: Typically > 80 microns, based on IS 1239 standards, providing robust corrosion resistance.
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