What Are GI Pipes?
Per BIS IS 1239 (Part 1):2004, Galvanized Iron (GI) pipes are ERW pipes coated with zinc through hot-dip galvanizing per IS 4736, providing excellent corrosion resistance. They are the standard choice for potable water supply, plumbing, fire protection, and outdoor structural applications across India. According to the Bureau of Indian Standards, the zinc coating extends service life by 15–25 years compared to uncoated MS ERW pipes.
- Hot-dip galvanized zinc coating per IS 4736 — 300 g/m² minimum
- Available in Light (Class A), Medium (Class B), and Heavy (Class C)
- Threaded and coupled (T&C) or plain-end supply
- Corrosion-resistant — ideal for water, outdoor, and buried applications
Specifications We Stock
| Nominal Bore (NB) | 15mm (½") to 150mm (6") |
|---|---|
| Wall Thickness | Light 1.8–3.6mm, Medium 2.0–4.5mm, Heavy 2.6–5.4mm |
| Standards | IS 1239 Part 1, IS 4736 (galvanizing), ASTM A53, BS 1387 |
| Zinc Coating | Hot-dip galvanized, 300 g/m² minimum per IS 4736 |
| Lengths | Standard 6 meters, threaded & coupled with GI socket |
Common Applications
- Water Supply: Municipal and residential drinking water distribution.
- Fire Protection: Fire fighting sprinkler systems, standpipe installations.
- Construction: Scaffolding, fencing, greenhouse frames, handrails.
- Agriculture: Irrigation lines, pump risers, greenhouse structures.
Source Mills We Work With
We procure materials exclusively from highly reputed Indian and global steel mills, including:
APL ApolloTata SteelJindal StarSurya RoshniHi-Tech Pipes
How To Order
- Specify nominal bore (NB), class (Light/Medium/Heavy), and quantity in meters or MT.
- Indicate end finish — threaded & coupled (standard) or plain-end.
- Confirm delivery location for freight calculation.
- Approve quotation and PO — we dispatch from Kanpur stockyard.
Frequently Asked Questions
What is the difference between GI pipes and MS pipes?
GI pipes are MS ERW pipes with a hot-dip galvanized zinc coating per IS 4736. The zinc layer protects against corrosion and rust, extending service life by 15–25 years. MS pipes are cheaper but require painting or coating for outdoor or wet environments. For water supply, GI pipes are always preferred.
Which class of GI pipe should I use for water supply?
Medium class (Class B) is the standard for residential and commercial water supply in India. Light class (Class A) is used for low-pressure applications like fencing. Heavy class (Class C) is specified for high-pressure fire fighting systems and industrial water mains.
Do GI pipes come threaded?
Yes, GI pipes per IS 1239 are supplied threaded and coupled as standard — each pipe comes with one GI coupling (socket). Plain-end GI pipes are available on request for grooved or flanged connections.
Related
- GI Pipes — Kanpur wholesale supply — pricing, delivery zones, and grade options for buyers in UP and North India.
- Calculate the weight of GI Pipes for your BOQ — size, wall, and length to MT before requesting a quote.
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