GI Rectangular Tube

GI Pipes (Galvanized Iron Pipes) – Utkarsh & Jindal Brands | IS 1239 / IS 3589 Certified

India's Most Trusted Galvanized Iron Pipes for Water, Gas, Agriculture & Infrastructure

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Overview

Galvanized Iron (GI) Pipes are mild steel pipes coated with a protective layer of zinc through the hot-dip galvanization process, making them one of the most reliable and widely used piping solutions across India's construction, agriculture, industrial, and water infrastructure sectors. The zinc coating acts as a sacrificial barrier — corroding first before the base steel is ever attacked — dramatically extending the service life of the pipe even in harsh outdoor and underground conditions.

We stock and supply GI Pipes from two of India's most trusted brands — Utkarsh India and Jindal (Jindal India Limited) — both manufactured in compliance with Bureau of Indian Standards (BIS) certifications under IS 1239 (Part 1) and IS 3589, ensuring consistent quality, dimensional accuracy, and pressure-tested integrity in every pipe.

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Why Choose ISI-Certified GI Pipes from Utkarsh or Jindal?

Both Utkarsh India and Jindal are marquee names in India's steel pipe industry. Here's what makes them the preferred choice for engineers, contractors, government projects, and procurement teams alike:

• BIS / ISI Certified — All pipes are manufactured under strict BIS compliance and bear the ISI mark, ensuring adherence to national quality standards
• Premium Raw Materials — Utkarsh sources hot-rolled coils (HRC) from TATA and SAIL; Jindal similarly uses IS:10748 compliant HRC for all its pipe manufacturing
• Hot-Dip Galvanization — Both brands employ hot-dip galvanizing which produces a thicker, more uniform, and more adherent zinc coating compared to electrogalvanizing or pre-galvanizing
• Hydrostatic Testing — Every pipe is pressure-tested at 5 MPa (51 Kgf/cm²) to guarantee leak-proof integrity before dispatch
• Multi-Stage Quality Control — Raw material inspection through final dispatch QC ensures dimensional accuracy and consistent performance
• Wide Application Coverage — Suitable for water supply, gas lines, irrigation, firefighting, HVAC, structural, and industrial fluid transport

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Key Features

• Compatible with Standard Fittings — Available in threaded ends compatible with standard GI fittings, elbows, tees, reducers, unions, and nipples
• Corrosion & Oxidation Resistance — Ideal for outdoor, underground, and concealed piping in humid, coastal, and agricultural environments
• High Tensile Strength — Tensile strength ranging from 240 MPa to 410 MPa depending on class, suitable for demanding pressure applications
• Hot-Dip Zinc Coating — Thicker and more durable than electrogalvanized alternatives; the zinc sacrificially corrodes first, protecting the underlying steel for decades
• ISI Marked — BIS certification assures conformance to dimensional, mechanical, and galvanization quality benchmarks
• Leak-Proof Design — Deep-threaded ends with robust sockets ensure high-grip, leak-free joints even under sustained pressure
• Lightweight & Easy to Handle — Lower weight compared to cast iron and ductile iron alternatives makes transportation, installation, and maintenance easier and more economical
• Long Service Life — Uniform zinc coating and tight manufacturing tolerances ensure low maintenance and extended operational lifespan
• Weldable — Can be welded without pre-heating or post-weld heat treatment for most applications, enabling flexible fabrication

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Product Specifications

IS 1239 (Part 1) – GI Pipe Specifications (15 mm to 150 mm NB)

Parameter	Specification
Standard	IS 1239 Part 1 – 2004 (Equivalent: BS 1387 / EN 10255)
Size Range	½" (15 mm NB) to 6" (150 mm NB)
Classes Available	Class A (Light), Class B (Medium), Class C (Heavy)
Manufacturing Process	ERW (Electric Resistance Welded) / HFIW
Material	Mild Steel (MS) — Galvanized
Zinc Coating	Hot-Dip Galvanized
Pipe Length	4 m, 5.5 m, 6 m; custom lengths available up to 12 m
End Conditions	Plain End, Screwed Without Socket (SWS), Screwed With Socket (SWS+Socket), Beveled End
HSN Code	7306

IS 1239 Wall Thickness Reference Chart

NB Size	OD (mm)	Class A – Wall Thickness	Class B – Wall Thickness	Class C – Wall Thickness
½" (15 mm)	21.3 mm	2.0 mm	2.6 mm	3.2 mm
¾" (20 mm)	26.9 mm	2.3 mm	2.6 mm	3.2 mm
1" (25 mm)	33.7 mm	2.6 mm	3.2 mm	4.0 mm
1¼" (32 mm)	42.4 mm	2.6 mm	3.2 mm	4.0 mm
1½" (40 mm)	48.3 mm	2.9 mm	3.2 mm	4.0 mm
2" (50 mm)	60.3 mm	2.9 mm	3.6 mm	4.5 mm
2½" (65 mm)	76.1 mm	3.2 mm	3.6 mm	4.5 mm
3" (80 mm)	88.9 mm	3.2 mm	4.0 mm	4.8 mm
4" (100 mm)	114.3 mm	3.6 mm	4.5 mm	5.4 mm
5" (125 mm)	139.7 mm	4.0 mm	4.5 mm	5.4 mm
6" (150 mm)	165.1 mm	4.0 mm	4.5 mm	5.4 mm

Galvanized pipes are slightly heavier than equivalent MS Black pipes due to the zinc coating weight.

IS 3589 – Large Diameter GI/MS Pipe Specifications (Above 6" NB)

Parameter	Specification
Standard	IS 3589 – 2001
Grades	Grade FE 330 / Grade FE 410
Size Range	168.3 mm OD (6" NB) and above
Manufacturing Process	ERW / EFW (Electric Fusion Welded)
Application	Municipal waterworks, large infrastructure, industrial pipelines

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Mechanical Properties

Property	Class A (Light)	Class B (Medium)	Class C (Heavy)
Yield Strength (min.)	195 MPa	235 MPa	275 MPa
Tensile Strength (min.)	320 MPa	360 MPa	410 MPa
Elongation (min.)	20%	20%	20%
Hydrostatic Test Pressure	5 MPa (51 kgf/cm²)	5 MPa (51 kgf/cm²)	5 MPa (51 kgf/cm²)

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Chemical Composition (Base MS Material)

Element	Max. Content
Carbon (C)	0.20%
Manganese (Mn)	1.30%
Phosphorus (P)	0.040%
Sulfur (S)	0.040%

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Applications

GI Pipes are specified across a vast range of applications:

Plumbing & Water Supply:

• Potable water distribution in residential, commercial, and municipal projects
• Overhead and underground water supply lines
• Domestic plumbing and internal building water networks
• Rural and agricultural water supply schemes

Agriculture & Irrigation:

• Sprinkler irrigation systems
• Drip-feed lateral distribution lines
• Farm water conveyance and borewell column piping

Fire Fighting & Safety:

• Fire sprinkler systems (IS 1239, ASTM A 795 / A 135 compliant)
• Hydrant supply lines
• Grooved pipe systems for HVAC and firefighting

Industrial & Infrastructure:

• Gas distribution networks (LPG, CNG, compressed air lines)
• Chemical plant fluid conveyance
• Sewage treatment and drainage systems
• HVAC (Heating, Ventilation & Air Conditioning) piping

Structural & Fabrication:

• Scaffolding and construction staging frameworks
• Greenhouses, polyhouses, and shade net structures
• Fencing frameworks and boundary posts
• Solar structure framing and module mounting supports
• Industrial racks, shelves, and support structures

Government & Infrastructure Projects:

• Jal Jeevan Mission (Har Ghar Jal) water supply pipelines
• Smart City water infrastructure
• Railway electrification and telecom support structures
• Road and highway construction infrastructure

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How to Choose the Right Class

Use Case	Recommended Class
Non-pressure fencing, cable conduit, lightweight framing	Class A – Light
Domestic water supply, gas lines, general plumbing, agriculture	Class B – Medium (Most Popular)
Fire-fighting lines, concealed/underground piping, high-pressure supply	Class C – Heavy
Large diameter municipal/industrial water supply (6" and above)	IS 3589 – Grade 330 / 410

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Frequently Asked Questions (FAQs)

Q: What is the difference between Class A, B, and C GI pipes? The classes refer to wall thickness — Class A (Light) has the thinnest walls and is used for low-load, non-pressure applications; Class B (Medium) is the most commonly used for general plumbing and water supply; Class C (Heavy) has the thickest walls and is ideal for high-pressure, underground, or fire-fighting applications.

Q: Are these pipes safe for drinking water (potable water)? Yes. GI pipes conforming to IS 1239 are widely used for potable water distribution. The hot-dip zinc coating is chemically stable and safe for water transport. They are the material of choice for the Government of India's Jal Jeevan Mission and rural water supply schemes.

Q: What end types are available? GI pipes are available in Plain End (PE), Screwed Without Socket (SWS), Screwed With Socket (SWS + Socket), and Beveled End options to suit various jointing and installation methods.

Q: What is the standard length of GI pipes? Standard supply lengths is 6 m.

Q: Can GI pipes be used for gas lines? Yes. Medium class (Class B) GI pipes are commonly used for LPG, CNG, and compressed air distribution in residential, commercial, and industrial settings as per applicable regulations.

Q: What is the HSN Code for GI pipes? The HSN Code for GI pipes (welded steel tubes and pipes) is 7306.

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GI Pipes — ISI Certified. Corrosion Protected. Built for India's Infrastructure.