Hot Dip Galvanized Water Pipe & GI Pipe — BS1387 / ASTM A53 / Schedule 40 — 1/2" to 6" for Water Supply, Plumbing & Irrigation
Product Introduction
Production Process
| Standard | Common Trade Names | Wall Thickness Class | Typical Application |
|---|---|---|---|
| BS 1387 | Class B GI pipe, Class C GI pipe, BS1387 galvanized pipe | Light / Medium (Class B) / Heavy (Class C) | Water supply, gas, plumbing, fire protection |
| ASTM A53 | Schedule 40 GI pipe, Schedule 80 galvanized pipe | Sch10 / Sch40 / Sch80 / Sch160 | Water, steam, air, structural |
| EN 10255 | Medium galvanized pipe, Heavy galvanized pipe, S195T GI pipe | L1 (Light) / L2 (Medium) / H (Heavy) | Water, gas, heating, fire sprinkler |
| IS 1239 | Medium class GI pipe, Heavy class GI pipe | Light / Medium / Heavy | Water, plumbing, irrigation |
| ASTM A795 | Fire protection galvanized pipe, NFPA GI pipe | Schedule 10 / Schedule 40 | Fire sprinkler systems |
| AS 1074 | AS 1074 galvanized pipe | Light / Medium / Heavy | Water, gas (Australia / New Zealand) |
| ASTM | EN | GB | Application Notes |
|---|---|---|---|
| ASTM A53 Gr.A | S195T | Q195 | Standard water & plumbing pipe |
| ASTM A53 Gr.B | S235JR | Q235B | Higher strength for water supply & structural |
| ASTM A500 Gr.B | S355JR | Q345B | Heavy-duty water mains & industrial piping |
Galvanized Water Pipe Sizes — 1/2" to 6"
Our galvanized steel pipe sizes cover the most commonly searched dimensions for water supply and plumbing. Schedule 40 GI pipe and BS1387 Class B GI pipe are always in stock. Custom schedule 80 galvanized pipe and Class C heavy GI pipe available on order.
| Nominal Size (Inch) | DN | OD (mm) | Wall Thickness Range | Standard Length |
|---|---|---|---|---|
| 1/2 inch | DN15 | 21.3 | 1.8mm - 3.7mm | 6m / 20ft |
| 3/4 inch | DN20 | 26.9 | 1.8mm - 3.9mm | 6m / 20ft |
| 1 inch | DN25 | 33.7 | 2.0mm - 4.5mm | 6m / 20ft |
| 1-1/4 inch | DN32 | 42.4 | 2.0mm - 5.0mm | 6m / 20ft |
| 1-1/2 inch | DN40 | 48.3 | 2.3mm - 5.1mm | 6m / 20ft |
| 2 inch | DN50 | 60.3 | 2.3mm - 5.5mm | 6m / 20ft |
| 2-1/2 inch | DN65 | 76.1 | 2.6mm - 5.2mm | 6m / 20ft |
| 3 inch | DN80 | 88.9 | 2.9mm - 5.5mm | 6m / 20ft |
| 4 inch | DN100 | 114.3 | 3.2mm - 6.0mm | 6m / 20ft |
| 6 inch | DN150 | 168.3 | 3.4mm - 7.1mm | 6m / 20ft |
| 8 inch | DN200 | 219.1 | 4.0mm - 8.2mm | 6m / 20ft |
Also available: schedule 80 GI pipe · class C heavy GI pipe · galvanized pipe 10 ft · galvanized pipe 21 ft · GI pipe 6 meter · GI pipe 20 feet · threaded & coupled ends · grooved ends · plain ends
Galvanized Pipe Applications
Advantages
Corrosion resistance: 200-500 g/m² zinc coating protects against rust for 30+ years in water supply applications
Factory-direct pricing: As a galvanized pipe manufacturer, we cut out middlemen — you get wholesale GI pipe price
Full certifications: ISO 9001, CE, BV certified. Mill Test Certificate (MTC) with every shipment. Third-party SGS inspection available
In-stock sizes: 1/2" to 6" in Schedule 40 GI pipe and BS1387 Class B ready for immediate shipment
Custom length & ends: Plain, threaded & coupled, beveled, or grooved ends. Cut to 6m, 20ft, 21ft, or custom
Global logistics: Tianjin port base with competitive container and bulk vessel freight to 50+ countries
Packaging and Shipping
Standard export packing: bare pipe in bundles with steel straps, or wrapped with water-resistant fabric. Threaded ends protected with plastic caps. Shipping by 20ft / 40ft container or bulk break-bulk vessel. We serve major destinations including UAE, Saudi Arabia, Philippines, Singapore, Nigeria, Kenya, New Zealand, Guyana, Jamaica, Panama, Trinidad & Tobago, and Israel.
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Q: What is the difference between GI pipe and galvanized steel pipe?
They refer to the same product. GI pipe (Galvanized Iron pipe) is the common trade name in Asia, Africa, and the Middle East. Galvanized steel pipe is the formal term used in international trade and Western markets. Both describe steel pipe with a zinc coating for corrosion protection.
Q: What sizes of GI water pipe are in stock?
We stock 1/2 inch through 6 inch (DN15-DN150) in Schedule 40 and BS1387 Class B. Larger sizes (8 inch / DN200) and Schedule 80 available on order. Standard length is 6 meters (20 feet). Custom lengths of 10 ft, 21 ft, or cut-to-length available.
Q: Can galvanized pipe be used for drinking water?
Yes, our hot-dip galvanized water pipe meets international potable water standards. However, always confirm compliance with local plumbing codes — some countries have shifted to copper/PEX for indoor use, while GI pipe remains dominant for outdoor supply lines, borehole connections, and municipal mains in most developing markets.
Q: What is the MOQ and how to get GI pipe price?
MOQ is 5 tons per size. Fill in the inquiry form below with your required size, wall thickness (e.g. Schedule 40 / Class B), standard, and destination port. We reply with the galvanized pipe price and shipping quote within 2 hours.
Q: Do you offer BS1387 Class B and Class C GI pipe?
Yes. Class B GI pipe (medium wall) is always in stock. Class C GI pipe (heavy wall) available on order. Both meet BS1387 standard with threaded or plain ends. We also supply BS1387 galvanized water pipe in sizes from 1/2" to 6".
Q: What countries do you export to?
We export to 50+ countries including UAE, Saudi Arabia, Qatar, Kuwait, Philippines, Singapore, Vietnam, Indonesia, Myanmar, Bangladesh, Nigeria, Kenya, Ghana, Tanzania, New Zealand, Peru, Israel, Guyana, Jamaica, Panama, and Trinidad & Tobago. Get Latest Price with your destination port for a shipping estimate.